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Carla/source/modules/juce_gui_basics/drawables/juce_SVGParser.cpp

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  1. /*

  2.   ==============================================================================

  3. 

  4.    This file is part of the JUCE library.

  5.    Copyright (c) 2015 - ROLI Ltd.

  6. 

  7.    Permission is granted to use this software under the terms of either:

  8.    a) the GPL v2 (or any later version)

  9.    b) the Affero GPL v3

  10. 

  11.    Details of these licenses can be found at: www.gnu.org/licenses

  12. 

  13.    JUCE is distributed in the hope that it will be useful, but WITHOUT ANY

  14.    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR

  15.    A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

  16. 

  17.    ------------------------------------------------------------------------------

  18. 

  19.    To release a closed-source product which uses JUCE, commercial licenses are

  20.    available: visit www.juce.com for more information.

  21. 

  22.   ==============================================================================

  23. */

  24. 

  25. class SVGState

  26. {

  27. public:

  28.     //==============================================================================

  29.     explicit SVGState (const XmlElement* const topLevel)

  30.         : topLevelXml (topLevel, nullptr),

  31.           elementX (0), elementY (0),

  32.           width (512), height (512),

  33.           viewBoxW (0), viewBoxH (0)

  34.     {

  35.     }

  36. 

  37.     struct XmlPath

  38.     {

  39.         XmlPath (const XmlElement* e, const XmlPath* p) noexcept : xml (e), parent (p)  {}

  40. 

  41.         const XmlElement& operator*() const noexcept            { jassert (xml != nullptr); return *xml; }

  42.         const XmlElement* operator->() const noexcept           { return xml; }

  43.         XmlPath getChild (const XmlElement* e) const noexcept   { return XmlPath (e, this); }

  44. 

  45.         const XmlElement* xml;

  46.         const XmlPath* parent;

  47.     };

  48. 

  49.     //==============================================================================

  50.     Drawable* parseSVGElement (const XmlPath& xml)

  51.     {

  52.         if (! xml->hasTagNameIgnoringNamespace ("svg"))

  53.             return nullptr;

  54. 

  55.         DrawableComposite* const drawable = new DrawableComposite();

  56. 

  57.         setCommonAttributes (*drawable, xml);

  58. 

  59.         SVGState newState (*this);

  60. 

  61.         if (xml->hasAttribute ("transform"))

  62.             newState.addTransform (xml);

  63. 

  64.         newState.elementX = getCoordLength (xml->getStringAttribute ("x",      String (newState.elementX)), viewBoxW);

  65.         newState.elementY = getCoordLength (xml->getStringAttribute ("y",      String (newState.elementY)), viewBoxH);

  66.         newState.width    = getCoordLength (xml->getStringAttribute ("width",  String (newState.width)),    viewBoxW);

  67.         newState.height   = getCoordLength (xml->getStringAttribute ("height", String (newState.height)),   viewBoxH);

  68. 

  69.         if (newState.width  <= 0) newState.width  = 100;

  70.         if (newState.height <= 0) newState.height = 100;

  71. 

  72.         Point<float> viewboxXY;

  73. 

  74.         if (xml->hasAttribute ("viewBox"))

  75.         {

  76.             const String viewBoxAtt (xml->getStringAttribute ("viewBox"));

  77.             String::CharPointerType viewParams (viewBoxAtt.getCharPointer());

  78.             Point<float> vwh;

  79. 

  80.             if (parseCoords (viewParams, viewboxXY, true)

  81.                  && parseCoords (viewParams, vwh, true)

  82.                  && vwh.x > 0

  83.                  && vwh.y > 0)

  84.             {

  85.                 newState.viewBoxW = vwh.x;

  86.                 newState.viewBoxH = vwh.y;

  87. 

  88.                 const int placementFlags = parsePlacementFlags (xml->getStringAttribute ("preserveAspectRatio").trim());

  89. 

  90.                 if (placementFlags != 0)

  91.                     newState.transform = RectanglePlacement (placementFlags)

  92.                                             .getTransformToFit (Rectangle<float> (viewboxXY.x, viewboxXY.y, vwh.x, vwh.y),

  93.                                                                 Rectangle<float> (newState.width, newState.height))

  94.                                             .followedBy (newState.transform);

  95.             }

  96.         }

  97.         else

  98.         {

  99.             if (viewBoxW == 0)  newState.viewBoxW = newState.width;

  100.             if (viewBoxH == 0)  newState.viewBoxH = newState.height;

  101.         }

  102. 

  103.         newState.parseSubElements (xml, *drawable);

  104. 

  105.         drawable->setContentArea (RelativeRectangle (RelativeCoordinate (viewboxXY.x),

  106.                                                      RelativeCoordinate (viewboxXY.x + newState.viewBoxW),

  107.                                                      RelativeCoordinate (viewboxXY.y),

  108.                                                      RelativeCoordinate (viewboxXY.y + newState.viewBoxH)));

  109.         drawable->resetBoundingBoxToContentArea();

  110. 

  111.         return drawable;

  112.     }

  113. 

  114.     //==============================================================================

  115.     void parsePathString (Path& path, const String& pathString) const

  116.     {

  117.         String::CharPointerType d (pathString.getCharPointer().findEndOfWhitespace());

  118. 

  119.         Point<float> subpathStart, last, last2, p1, p2, p3;

  120.         juce_wchar lastCommandChar = 0;

  121.         bool isRelative = true;

  122.         bool carryOn = true;

  123. 

  124.         const CharPointer_ASCII validCommandChars ("MmLlHhVvCcSsQqTtAaZz");

  125. 

  126.         while (! d.isEmpty())

  127.         {

  128.             if (validCommandChars.indexOf (*d) >= 0)

  129.             {

  130.                 lastCommandChar = d.getAndAdvance();

  131.                 isRelative = (lastCommandChar >= 'a' && lastCommandChar <= 'z');

  132.             }

  133. 

  134.             switch (lastCommandChar)

  135.             {

  136.             case 'M':

  137.             case 'm':

  138.             case 'L':

  139.             case 'l':

  140.                 if (parseCoordsOrSkip (d, p1, false))

  141.                 {

  142.                     if (isRelative)

  143.                         p1 += last;

  144. 

  145.                     if (lastCommandChar == 'M' || lastCommandChar == 'm')

  146.                     {

  147.                         subpathStart = p1;

  148.                         path.startNewSubPath (p1);

  149.                         lastCommandChar = 'l';

  150.                     }

  151.                     else

  152.                         path.lineTo (p1);

  153. 

  154.                     last2 = last;

  155.                     last = p1;

  156.                 }

  157.                 break;

  158. 

  159.             case 'H':

  160.             case 'h':

  161.                 if (parseCoord (d, p1.x, false, true))

  162.                 {

  163.                     if (isRelative)

  164.                         p1.x += last.x;

  165. 

  166.                     path.lineTo (p1.x, last.y);

  167. 

  168.                     last2.x = last.x;

  169.                     last.x = p1.x;

  170.                 }

  171.                 else

  172.                 {

  173.                     ++d;

  174.                 }

  175.                 break;

  176. 

  177.             case 'V':

  178.             case 'v':

  179.                 if (parseCoord (d, p1.y, false, false))

  180.                 {

  181.                     if (isRelative)

  182.                         p1.y += last.y;

  183. 

  184.                     path.lineTo (last.x, p1.y);

  185. 

  186.                     last2.y = last.y;

  187.                     last.y = p1.y;

  188.                 }

  189.                 else

  190.                 {

  191.                     ++d;

  192.                 }

  193.                 break;

  194. 

  195.             case 'C':

  196.             case 'c':

  197.                 if (parseCoordsOrSkip (d, p1, false)

  198.                      && parseCoordsOrSkip (d, p2, false)

  199.                      && parseCoordsOrSkip (d, p3, false))

  200.                 {

  201.                     if (isRelative)

  202.                     {

  203.                         p1 += last;

  204.                         p2 += last;

  205.                         p3 += last;

  206.                     }

  207. 

  208.                     path.cubicTo (p1, p2, p3);

  209. 

  210.                     last2 = p2;

  211.                     last = p3;

  212.                 }

  213.                 break;

  214. 

  215.             case 'S':

  216.             case 's':

  217.                 if (parseCoordsOrSkip (d, p1, false)

  218.                      && parseCoordsOrSkip (d, p3, false))

  219.                 {

  220.                     if (isRelative)

  221.                     {

  222.                         p1 += last;

  223.                         p3 += last;

  224.                     }

  225. 

  226.                     p2 = last + (last - last2);

  227.                     path.cubicTo (p2, p1, p3);

  228. 

  229.                     last2 = p1;

  230.                     last = p3;

  231.                 }

  232.                 break;

  233. 

  234.             case 'Q':

  235.             case 'q':

  236.                 if (parseCoordsOrSkip (d, p1, false)

  237.                      && parseCoordsOrSkip (d, p2, false))

  238.                 {

  239.                     if (isRelative)

  240.                     {

  241.                         p1 += last;

  242.                         p2 += last;

  243.                     }

  244. 

  245.                     path.quadraticTo (p1, p2);

  246. 

  247.                     last2 = p1;

  248.                     last = p2;

  249.                 }

  250.                 break;

  251. 

  252.             case 'T':

  253.             case 't':

  254.                 if (parseCoordsOrSkip (d, p1, false))

  255.                 {

  256.                     if (isRelative)

  257.                         p1 += last;

  258. 

  259.                     p2 = last + (last - last2);

  260.                     path.quadraticTo (p2, p1);

  261. 

  262.                     last2 = p2;

  263.                     last = p1;

  264.                 }

  265.                 break;

  266. 

  267.             case 'A':

  268.             case 'a':

  269.                 if (parseCoordsOrSkip (d, p1, false))

  270.                 {

  271.                     String num;

  272. 

  273.                     if (parseNextNumber (d, num, false))

  274.                     {

  275.                         const float angle = degreesToRadians (num.getFloatValue());

  276. 

  277.                         if (parseNextNumber (d, num, false))

  278.                         {

  279.                             const bool largeArc = num.getIntValue() != 0;

  280. 

  281.                             if (parseNextNumber (d, num, false))

  282.                             {

  283.                                 const bool sweep = num.getIntValue() != 0;

  284. 

  285.                                 if (parseCoordsOrSkip (d, p2, false))

  286.                                 {

  287.                                     if (isRelative)

  288.                                         p2 += last;

  289. 

  290.                                     if (last != p2)

  291.                                     {

  292.                                         double centreX, centreY, startAngle, deltaAngle;

  293.                                         double rx = p1.x, ry = p1.y;

  294. 

  295.                                         endpointToCentreParameters (last.x, last.y, p2.x, p2.y,

  296.                                                                     angle, largeArc, sweep,

  297.                                                                     rx, ry, centreX, centreY,

  298.                                                                     startAngle, deltaAngle);

  299. 

  300.                                         path.addCentredArc ((float) centreX, (float) centreY,

  301.                                                             (float) rx, (float) ry,

  302.                                                             angle, (float) startAngle, (float) (startAngle + deltaAngle),

  303.                                                             false);

  304. 

  305.                                         path.lineTo (p2);

  306.                                     }

  307. 

  308.                                     last2 = last;

  309.                                     last = p2;

  310.                                 }

  311.                             }

  312.                         }

  313.                     }

  314.                 }

  315. 

  316.                 break;

  317. 

  318.             case 'Z':

  319.             case 'z':

  320.                 path.closeSubPath();

  321.                 last = last2 = subpathStart;

  322.                 d = d.findEndOfWhitespace();

  323.                 lastCommandChar = 'M';

  324.                 break;

  325. 

  326.             default:

  327.                 carryOn = false;

  328.                 break;

  329.             }

  330. 

  331.             if (! carryOn)

  332.                 break;

  333.         }

  334. 

  335.         // paths that finish back at their start position often seem to be

  336.         // left without a 'z', so need to be closed explicitly..

  337.         if (path.getCurrentPosition() == subpathStart)

  338.             path.closeSubPath();

  339.     }

  340. 

  341. private:

  342.     //==============================================================================

  343.     const XmlPath topLevelXml;

  344.     float elementX, elementY, width, height, viewBoxW, viewBoxH;

  345.     AffineTransform transform;

  346.     String cssStyleText;

  347. 

  348.     static void setCommonAttributes (Drawable& d, const XmlPath& xml)

  349.     {

  350.         String compID (xml->getStringAttribute ("id"));

  351.         d.setName (compID);

  352.         d.setComponentID (compID);

  353. 

  354.         if (xml->getStringAttribute ("display") == "none")

  355.             d.setVisible (false);

  356.     }

  357. 

  358.     //==============================================================================

  359.     void parseSubElements (const XmlPath& xml, DrawableComposite& parentDrawable)

  360.     {

  361.         forEachXmlChildElement (*xml, e)

  362.             parentDrawable.addAndMakeVisible (parseSubElement (xml.getChild (e)));

  363.     }

  364. 

  365.     Drawable* parseSubElement (const XmlPath& xml)

  366.     {

  367.         const String tag (xml->getTagNameWithoutNamespace());

  368. 

  369.         if (tag == "g")           return parseGroupElement (xml);

  370.         if (tag == "svg")         return parseSVGElement (xml);

  371.         if (tag == "path")        return parsePath (xml);

  372.         if (tag == "rect")        return parseRect (xml);

  373.         if (tag == "circle")      return parseCircle (xml);

  374.         if (tag == "ellipse")     return parseEllipse (xml);

  375.         if (tag == "line")        return parseLine (xml);

  376.         if (tag == "polyline")    return parsePolygon (xml, true);

  377.         if (tag == "polygon")     return parsePolygon (xml, false);

  378.         if (tag == "text")        return parseText (xml, true);

  379.         if (tag == "switch")      return parseSwitch (xml);

  380.         if (tag == "a")           return parseLinkElement (xml);

  381.         if (tag == "style")       parseCSSStyle (xml);

  382. 

  383.         return nullptr;

  384.     }

  385. 

  386.     DrawableComposite* parseSwitch (const XmlPath& xml)

  387.     {

  388.         if (const XmlElement* const group = xml->getChildByName ("g"))

  389.             return parseGroupElement (xml.getChild (group));

  390. 

  391.         return nullptr;

  392.     }

  393. 

  394.     DrawableComposite* parseGroupElement (const XmlPath& xml)

  395.     {

  396.         DrawableComposite* const drawable = new DrawableComposite();

  397. 

  398.         setCommonAttributes (*drawable, xml);

  399. 

  400.         if (xml->hasAttribute ("transform"))

  401.         {

  402.             SVGState newState (*this);

  403.             newState.addTransform (xml);

  404. 

  405.             newState.parseSubElements (xml, *drawable);

  406.         }

  407.         else

  408.         {

  409.             parseSubElements (xml, *drawable);

  410.         }

  411. 

  412.         drawable->resetContentAreaAndBoundingBoxToFitChildren();

  413.         return drawable;

  414.     }

  415. 

  416.     DrawableComposite* parseLinkElement (const XmlPath& xml)

  417.     {

  418.         return parseGroupElement (xml); // TODO: support for making this clickable

  419.     }

  420. 

  421.     //==============================================================================

  422.     Drawable* parsePath (const XmlPath& xml) const

  423.     {

  424.         Path path;

  425.         parsePathString (path, xml->getStringAttribute ("d"));

  426. 

  427.         if (getStyleAttribute (xml, "fill-rule").trim().equalsIgnoreCase ("evenodd"))

  428.             path.setUsingNonZeroWinding (false);

  429. 

  430.         return parseShape (xml, path);

  431.     }

  432. 

  433.     Drawable* parseRect (const XmlPath& xml) const

  434.     {

  435.         Path rect;

  436. 

  437.         const bool hasRX = xml->hasAttribute ("rx");

  438.         const bool hasRY = xml->hasAttribute ("ry");

  439. 

  440.         if (hasRX || hasRY)

  441.         {

  442.             float rx = getCoordLength (xml, "rx", viewBoxW);

  443.             float ry = getCoordLength (xml, "ry", viewBoxH);

  444. 

  445.             if (! hasRX)

  446.                 rx = ry;

  447.             else if (! hasRY)

  448.                 ry = rx;

  449. 

  450.             rect.addRoundedRectangle (getCoordLength (xml, "x", viewBoxW),

  451.                                       getCoordLength (xml, "y", viewBoxH),

  452.                                       getCoordLength (xml, "width", viewBoxW),

  453.                                       getCoordLength (xml, "height", viewBoxH),

  454.                                       rx, ry);

  455.         }

  456.         else

  457.         {

  458.             rect.addRectangle (getCoordLength (xml, "x", viewBoxW),

  459.                                getCoordLength (xml, "y", viewBoxH),

  460.                                getCoordLength (xml, "width", viewBoxW),

  461.                                getCoordLength (xml, "height", viewBoxH));

  462.         }

  463. 

  464.         return parseShape (xml, rect);

  465.     }

  466. 

  467.     Drawable* parseCircle (const XmlPath& xml) const

  468.     {

  469.         Path circle;

  470. 

  471.         const float cx = getCoordLength (xml, "cx", viewBoxW);

  472.         const float cy = getCoordLength (xml, "cy", viewBoxH);

  473.         const float radius = getCoordLength (xml, "r", viewBoxW);

  474. 

  475.         circle.addEllipse (cx - radius, cy - radius, radius * 2.0f, radius * 2.0f);

  476. 

  477.         return parseShape (xml, circle);

  478.     }

  479. 

  480.     Drawable* parseEllipse (const XmlPath& xml) const

  481.     {

  482.         Path ellipse;

  483. 

  484.         const float cx      = getCoordLength (xml, "cx", viewBoxW);

  485.         const float cy      = getCoordLength (xml, "cy", viewBoxH);

  486.         const float radiusX = getCoordLength (xml, "rx", viewBoxW);

  487.         const float radiusY = getCoordLength (xml, "ry", viewBoxH);

  488. 

  489.         ellipse.addEllipse (cx - radiusX, cy - radiusY, radiusX * 2.0f, radiusY * 2.0f);

  490. 

  491.         return parseShape (xml, ellipse);

  492.     }

  493. 

  494.     Drawable* parseLine (const XmlPath& xml) const

  495.     {

  496.         Path line;

  497. 

  498.         const float x1 = getCoordLength (xml, "x1", viewBoxW);

  499.         const float y1 = getCoordLength (xml, "y1", viewBoxH);

  500.         const float x2 = getCoordLength (xml, "x2", viewBoxW);

  501.         const float y2 = getCoordLength (xml, "y2", viewBoxH);

  502. 

  503.         line.startNewSubPath (x1, y1);

  504.         line.lineTo (x2, y2);

  505. 

  506.         return parseShape (xml, line);

  507.     }

  508. 

  509.     Drawable* parsePolygon (const XmlPath& xml, const bool isPolyline) const

  510.     {

  511.         const String pointsAtt (xml->getStringAttribute ("points"));

  512.         String::CharPointerType points (pointsAtt.getCharPointer());

  513.         Path path;

  514.         Point<float> p;

  515. 

  516.         if (parseCoords (points, p, true))

  517.         {

  518.             Point<float> first (p), last;

  519. 

  520.             path.startNewSubPath (first);

  521. 

  522.             while (parseCoords (points, p, true))

  523.             {

  524.                 last = p;

  525.                 path.lineTo (p);

  526.             }

  527. 

  528.             if ((! isPolyline) || first == last)

  529.                 path.closeSubPath();

  530.         }

  531. 

  532.         return parseShape (xml, path);

  533.     }

  534. 

  535.     //==============================================================================

  536.     Drawable* parseShape (const XmlPath& xml, Path& path,

  537.                           const bool shouldParseTransform = true) const

  538.     {

  539.         if (shouldParseTransform && xml->hasAttribute ("transform"))

  540.         {

  541.             SVGState newState (*this);

  542.             newState.addTransform (xml);

  543. 

  544.             return newState.parseShape (xml, path, false);

  545.         }

  546. 

  547.         DrawablePath* dp = new DrawablePath();

  548.         setCommonAttributes (*dp, xml);

  549.         dp->setFill (Colours::transparentBlack);

  550. 

  551.         path.applyTransform (transform);

  552.         dp->setPath (path);

  553. 

  554.         dp->setFill (getPathFillType (path,

  555.                                       getStyleAttribute (xml, "fill"),

  556.                                       getStyleAttribute (xml, "fill-opacity"),

  557.                                       getStyleAttribute (xml, "opacity"),

  558.                                       pathContainsClosedSubPath (path) ? Colours::black

  559.                                                                        : Colours::transparentBlack));

  560. 

  561.         const String strokeType (getStyleAttribute (xml, "stroke"));

  562. 

  563.         if (strokeType.isNotEmpty() && ! strokeType.equalsIgnoreCase ("none"))

  564.         {

  565.             dp->setStrokeFill (getPathFillType (path, strokeType,

  566.                                                 getStyleAttribute (xml, "stroke-opacity"),

  567.                                                 getStyleAttribute (xml, "opacity"),

  568.                                                 Colours::transparentBlack));

  569. 

  570.             dp->setStrokeType (getStrokeFor (xml));

  571.         }

  572. 

  573.         return dp;

  574.     }

  575. 

  576.     static bool pathContainsClosedSubPath (const Path& path) noexcept

  577.     {

  578.         for (Path::Iterator iter (path); iter.next();)

  579.             if (iter.elementType == Path::Iterator::closePath)

  580.                 return true;

  581. 

  582.         return false;

  583.     }

  584. 

  585.     struct SetGradientStopsOp

  586.     {

  587.         const SVGState* state;

  588.         ColourGradient* gradient;

  589. 

  590.         void operator() (const XmlPath& xml)

  591.         {

  592.             state->addGradientStopsIn (*gradient, xml);

  593.         }

  594.     };

  595. 

  596.     void addGradientStopsIn (ColourGradient& cg, const XmlPath& fillXml) const

  597.     {

  598.         if (fillXml.xml != nullptr)

  599.         {

  600.             forEachXmlChildElementWithTagName (*fillXml, e, "stop")

  601.             {

  602.                 int index = 0;

  603.                 Colour col (parseColour (getStyleAttribute (fillXml.getChild (e), "stop-color"), index, Colours::black));

  604. 

  605.                 const String opacity (getStyleAttribute (fillXml.getChild (e), "stop-opacity", "1"));

  606.                 col = col.withMultipliedAlpha (jlimit (0.0f, 1.0f, opacity.getFloatValue()));

  607. 

  608.                 double offset = e->getDoubleAttribute ("offset");

  609. 

  610.                 if (e->getStringAttribute ("offset").containsChar ('%'))

  611.                     offset *= 0.01;

  612. 

  613.                 cg.addColour (jlimit (0.0, 1.0, offset), col);

  614.             }

  615.         }

  616.     }

  617. 

  618.     FillType getGradientFillType (const XmlPath& fillXml,

  619.                                   const Path& path,

  620.                                   const float opacity) const

  621.     {

  622.         ColourGradient gradient;

  623. 

  624.         {

  625.             const String id (fillXml->getStringAttribute ("xlink:href"));

  626. 

  627.             if (id.startsWithChar ('#'))

  628.             {

  629.                 SetGradientStopsOp op = { this, &gradient, };

  630.                 findElementForId (topLevelXml, id.substring (1), op);

  631.             }

  632.         }

  633. 

  634.         addGradientStopsIn (gradient, fillXml);

  635. 

  636.         if (gradient.getNumColours() > 0)

  637.         {

  638.             gradient.addColour (0.0, gradient.getColour (0));

  639.             gradient.addColour (1.0, gradient.getColour (gradient.getNumColours() - 1));

  640.         }

  641.         else

  642.         {

  643.             gradient.addColour (0.0, Colours::black);

  644.             gradient.addColour (1.0, Colours::black);

  645.         }

  646. 

  647.         if (opacity < 1.0f)

  648.             gradient.multiplyOpacity (opacity);

  649. 

  650.         jassert (gradient.getNumColours() > 0);

  651. 

  652.         gradient.isRadial = fillXml->hasTagNameIgnoringNamespace ("radialGradient");

  653. 

  654.         float gradientWidth = viewBoxW;

  655.         float gradientHeight = viewBoxH;

  656.         float dx = 0.0f;

  657.         float dy = 0.0f;

  658. 

  659.         const bool userSpace = fillXml->getStringAttribute ("gradientUnits").equalsIgnoreCase ("userSpaceOnUse");

  660. 

  661.         if (! userSpace)

  662.         {

  663.             const Rectangle<float> bounds (path.getBounds());

  664.             dx = bounds.getX();

  665.             dy = bounds.getY();

  666.             gradientWidth = bounds.getWidth();

  667.             gradientHeight = bounds.getHeight();

  668.         }

  669. 

  670.         if (gradient.isRadial)

  671.         {

  672.             if (userSpace)

  673.                 gradient.point1.setXY (dx + getCoordLength (fillXml->getStringAttribute ("cx", "50%"), gradientWidth),

  674.                                        dy + getCoordLength (fillXml->getStringAttribute ("cy", "50%"), gradientHeight));

  675.             else

  676.                 gradient.point1.setXY (dx + gradientWidth  * getCoordLength (fillXml->getStringAttribute ("cx", "50%"), 1.0f),

  677.                                        dy + gradientHeight * getCoordLength (fillXml->getStringAttribute ("cy", "50%"), 1.0f));

  678. 

  679.             const float radius = getCoordLength (fillXml->getStringAttribute ("r", "50%"), gradientWidth);

  680.             gradient.point2 = gradient.point1 + Point<float> (radius, 0.0f);

  681. 

  682.             //xxx (the fx, fy focal point isn't handled properly here..)

  683.         }

  684.         else

  685.         {

  686.             if (userSpace)

  687.             {

  688.                 gradient.point1.setXY (dx + getCoordLength (fillXml->getStringAttribute ("x1", "0%"), gradientWidth),

  689.                                        dy + getCoordLength (fillXml->getStringAttribute ("y1", "0%"), gradientHeight));

  690. 

  691.                 gradient.point2.setXY (dx + getCoordLength (fillXml->getStringAttribute ("x2", "100%"), gradientWidth),

  692.                                        dy + getCoordLength (fillXml->getStringAttribute ("y2", "0%"), gradientHeight));

  693.             }

  694.             else

  695.             {

  696.                 gradient.point1.setXY (dx + gradientWidth  * getCoordLength (fillXml->getStringAttribute ("x1", "0%"), 1.0f),

  697.                                        dy + gradientHeight * getCoordLength (fillXml->getStringAttribute ("y1", "0%"), 1.0f));

  698. 

  699.                 gradient.point2.setXY (dx + gradientWidth  * getCoordLength (fillXml->getStringAttribute ("x2", "100%"), 1.0f),

  700.                                        dy + gradientHeight * getCoordLength (fillXml->getStringAttribute ("y2", "0%"), 1.0f));

  701.             }

  702. 

  703.             if (gradient.point1 == gradient.point2)

  704.                 return Colour (gradient.getColour (gradient.getNumColours() - 1));

  705.         }

  706. 

  707.         FillType type (gradient);

  708. 

  709.         const AffineTransform gradientTransform (parseTransform (fillXml->getStringAttribute ("gradientTransform"))

  710.                                                     .followedBy (transform));

  711. 

  712.         if (gradient.isRadial)

  713.         {

  714.             type.transform = gradientTransform;

  715.         }

  716.         else

  717.         {

  718.             // Transform the perpendicular vector into the new coordinate space for the gradient.

  719.             // This vector is now the slope of the linear gradient as it should appear in the new coord space

  720.             const Point<float> perpendicular (Point<float> (gradient.point2.y - gradient.point1.y,

  721.                                                             gradient.point1.x - gradient.point2.x)

  722.                                                   .transformedBy (gradientTransform.withAbsoluteTranslation (0, 0)));

  723. 

  724.             const Point<float> newGradPoint1 (gradient.point1.transformedBy (gradientTransform));

  725.             const Point<float> newGradPoint2 (gradient.point2.transformedBy (gradientTransform));

  726. 

  727.             // Project the transformed gradient vector onto the transformed slope of the linear

  728.             // gradient as it should appear in the new coordinate space

  729.             const float scale = perpendicular.getDotProduct (newGradPoint2 - newGradPoint1)

  730.                                   / perpendicular.getDotProduct (perpendicular);

  731. 

  732.             type.gradient->point1 = newGradPoint1;

  733.             type.gradient->point2 = newGradPoint2 - perpendicular * scale;

  734.         }

  735. 

  736.         return type;

  737.     }

  738. 

  739.     struct GetFillTypeOp

  740.     {

  741.         const SVGState* state;

  742.         FillType* dest;

  743.         const Path* path;

  744.         float opacity;

  745. 

  746.         void operator() (const XmlPath& xml)

  747.         {

  748.             if (xml->hasTagNameIgnoringNamespace ("linearGradient")

  749.                  || xml->hasTagNameIgnoringNamespace ("radialGradient"))

  750.                 *dest = state->getGradientFillType (xml, *path, opacity);

  751.         }

  752.     };

  753. 

  754.     FillType getPathFillType (const Path& path,

  755.                               const String& fill,

  756.                               const String& fillOpacity,

  757.                               const String& overallOpacity,

  758.                               const Colour defaultColour) const

  759.     {

  760.         float opacity = 1.0f;

  761. 

  762.         if (overallOpacity.isNotEmpty())

  763.             opacity = jlimit (0.0f, 1.0f, overallOpacity.getFloatValue());

  764. 

  765.         if (fillOpacity.isNotEmpty())

  766.             opacity *= (jlimit (0.0f, 1.0f, fillOpacity.getFloatValue()));

  767. 

  768.         if (fill.startsWithIgnoreCase ("url"))

  769.         {

  770.             const String id (fill.fromFirstOccurrenceOf ("#", false, false)

  771.                                  .upToLastOccurrenceOf (")", false, false).trim());

  772. 

  773.             FillType result;

  774.             GetFillTypeOp op = { this, &result, &path, opacity };

  775. 

  776.             if (findElementForId (topLevelXml, id, op))

  777.                 return result;

  778.         }

  779. 

  780.         if (fill.equalsIgnoreCase ("none"))

  781.             return Colours::transparentBlack;

  782. 

  783.         int i = 0;

  784.         return parseColour (fill, i, defaultColour).withMultipliedAlpha (opacity);

  785.     }

  786. 

  787.     static PathStrokeType::JointStyle getJointStyle (const String& join) noexcept

  788.     {

  789.         if (join.equalsIgnoreCase ("round"))  return PathStrokeType::curved;

  790.         if (join.equalsIgnoreCase ("bevel"))  return PathStrokeType::beveled;

  791. 

  792.         return PathStrokeType::mitered;

  793.     }

  794. 

  795.     static PathStrokeType::EndCapStyle getEndCapStyle (const String& cap) noexcept

  796.     {

  797.         if (cap.equalsIgnoreCase ("round"))   return PathStrokeType::rounded;

  798.         if (cap.equalsIgnoreCase ("square"))  return PathStrokeType::square;

  799. 

  800.         return PathStrokeType::butt;

  801.     }

  802. 

  803.     float getStrokeWidth (const String& strokeWidth) const noexcept

  804.     {

  805.         return transform.getScaleFactor() * getCoordLength (strokeWidth, viewBoxW);

  806.     }

  807. 

  808.     PathStrokeType getStrokeFor (const XmlPath& xml) const

  809.     {

  810.         return PathStrokeType (getStrokeWidth (getStyleAttribute (xml, "stroke-width", "1")),

  811.                                getJointStyle  (getStyleAttribute (xml, "stroke-linejoin")),

  812.                                getEndCapStyle (getStyleAttribute (xml, "stroke-linecap")));

  813.     }

  814. 

  815.     //==============================================================================

  816.     Drawable* parseText (const XmlPath& xml, bool shouldParseTransform)

  817.     {

  818.         if (shouldParseTransform && xml->hasAttribute ("transform"))

  819.         {

  820.             SVGState newState (*this);

  821.             newState.addTransform (xml);

  822. 

  823.             return newState.parseText (xml, false);

  824.         }

  825. 

  826.         Array<float> xCoords, yCoords, dxCoords, dyCoords;

  827. 

  828.         getCoordList (xCoords,  getInheritedAttribute (xml, "x"),  true, true);

  829.         getCoordList (yCoords,  getInheritedAttribute (xml, "y"),  true, false);

  830.         getCoordList (dxCoords, getInheritedAttribute (xml, "dx"), true, true);

  831.         getCoordList (dyCoords, getInheritedAttribute (xml, "dy"), true, false);

  832. 

  833.         const Font font (getFont (xml));

  834.         const String anchorStr = getStyleAttribute(xml, "text-anchor");

  835. 

  836.         DrawableComposite* dc = new DrawableComposite();

  837.         setCommonAttributes (*dc, xml);

  838. 

  839.         forEachXmlChildElement (*xml, e)

  840.         {

  841.             if (e->isTextElement())

  842.             {

  843.                 const String text (e->getText().trim());

  844. 

  845.                 DrawableText* dt = new DrawableText();

  846.                 dc->addAndMakeVisible (dt);

  847. 

  848.                 dt->setText (text);

  849.                 dt->setFont (font, true);

  850.                 dt->setTransform (transform);

  851. 

  852.                 int i = 0;

  853.                 dt->setColour (parseColour (getStyleAttribute (xml, "fill"), i, Colours::black)

  854.                                  .withMultipliedAlpha (getStyleAttribute (xml, "fill-opacity", "1").getFloatValue()));

  855. 

  856.                 Rectangle<float> bounds (xCoords[0], yCoords[0] - font.getAscent(),

  857.                                          font.getStringWidthFloat (text), font.getHeight());

  858. 

  859.                 if (anchorStr == "middle")   bounds.setX (bounds.getX() - bounds.getWidth() / 2.0f);

  860.                 else if (anchorStr == "end") bounds.setX (bounds.getX() - bounds.getWidth());

  861. 

  862.                 dt->setBoundingBox (bounds);

  863.             }

  864.             else if (e->hasTagNameIgnoringNamespace ("tspan"))

  865.             {

  866.                 dc->addAndMakeVisible (parseText (xml.getChild (e), true));

  867.             }

  868.         }

  869. 

  870.         return dc;

  871.     }

  872. 

  873.     Font getFont (const XmlPath& xml) const

  874.     {

  875.         const float fontSize = getCoordLength (getStyleAttribute (xml, "font-size"), 1.0f);

  876. 

  877.         int style = getStyleAttribute (xml, "font-style").containsIgnoreCase ("italic") ? Font::italic : Font::plain;

  878. 

  879.         if (getStyleAttribute (xml, "font-weight").containsIgnoreCase ("bold"))

  880.             style |= Font::bold;

  881. 

  882.         const String family (getStyleAttribute (xml, "font-family"));

  883. 

  884.         return family.isEmpty() ? Font (fontSize, style)

  885.                                 : Font (family, fontSize, style);

  886.     }

  887. 

  888.     //==============================================================================

  889.     void addTransform (const XmlPath& xml)

  890.     {

  891.         transform = parseTransform (xml->getStringAttribute ("transform"))

  892.                         .followedBy (transform);

  893.     }

  894. 

  895.     //==============================================================================

  896.     bool parseCoord (String::CharPointerType& s, float& value, const bool allowUnits, const bool isX) const

  897.     {

  898.         String number;

  899. 

  900.         if (! parseNextNumber (s, number, allowUnits))

  901.         {

  902.             value = 0;

  903.             return false;

  904.         }

  905. 

  906.         value = getCoordLength (number, isX ? viewBoxW : viewBoxH);

  907.         return true;

  908.     }

  909. 

  910.     bool parseCoords (String::CharPointerType& s, Point<float>& p, const bool allowUnits) const

  911.     {

  912.         return parseCoord (s, p.x, allowUnits, true)

  913.             && parseCoord (s, p.y, allowUnits, false);

  914.     }

  915. 

  916.     bool parseCoordsOrSkip (String::CharPointerType& s, Point<float>& p, const bool allowUnits) const

  917.     {

  918.         if (parseCoords (s, p, allowUnits))

  919.             return true;

  920. 

  921.         if (! s.isEmpty()) ++s;

  922.         return false;

  923.     }

  924. 

  925.     float getCoordLength (const String& s, const float sizeForProportions) const noexcept

  926.     {

  927.         float n = s.getFloatValue();

  928.         const int len = s.length();

  929. 

  930.         if (len > 2)

  931.         {

  932.             const float dpi = 96.0f;

  933. 

  934.             const juce_wchar n1 = s [len - 2];

  935.             const juce_wchar n2 = s [len - 1];

  936. 

  937.             if (n1 == 'i' && n2 == 'n')         n *= dpi;

  938.             else if (n1 == 'm' && n2 == 'm')    n *= dpi / 25.4f;

  939.             else if (n1 == 'c' && n2 == 'm')    n *= dpi / 2.54f;

  940.             else if (n1 == 'p' && n2 == 'c')    n *= 15.0f;

  941.             else if (n2 == '%')                 n *= 0.01f * sizeForProportions;

  942.         }

  943. 

  944.         return n;

  945.     }

  946. 

  947.     float getCoordLength (const XmlPath& xml, const char* attName, const float sizeForProportions) const noexcept

  948.     {

  949.         return getCoordLength (xml->getStringAttribute (attName), sizeForProportions);

  950.     }

  951. 

  952.     void getCoordList (Array<float>& coords, const String& list, bool allowUnits, const bool isX) const

  953.     {

  954.         String::CharPointerType text (list.getCharPointer());

  955.         float value;

  956. 

  957.         while (parseCoord (text, value, allowUnits, isX))

  958.             coords.add (value);

  959.     }

  960. 

  961.     //==============================================================================

  962.     void parseCSSStyle (const XmlPath& xml)

  963.     {

  964.         cssStyleText = xml->getAllSubText() + "\n" + cssStyleText;

  965.     }

  966. 

  967.     static String::CharPointerType findStyleItem (String::CharPointerType source, String::CharPointerType name)

  968.     {

  969.         const int nameLength = (int) name.length();

  970. 

  971.         while (! source.isEmpty())

  972.         {

  973.             if (source.getAndAdvance() == '.'

  974.                  && CharacterFunctions::compareIgnoreCaseUpTo (source, name, nameLength) == 0)

  975.             {

  976.                 String::CharPointerType endOfName ((source + nameLength).findEndOfWhitespace());

  977. 

  978.                 if (*endOfName == '{')

  979.                     return endOfName;

  980.             }

  981.         }

  982. 

  983.         return source;

  984.     }

  985. 

  986.     String getStyleAttribute (const XmlPath& xml, StringRef attributeName,

  987.                               const String& defaultValue = String()) const

  988.     {

  989.         if (xml->hasAttribute (attributeName))

  990.             return xml->getStringAttribute (attributeName, defaultValue);

  991. 

  992.         const String styleAtt (xml->getStringAttribute ("style"));

  993. 

  994.         if (styleAtt.isNotEmpty())

  995.         {

  996.             const String value (getAttributeFromStyleList (styleAtt, attributeName, String()));

  997. 

  998.             if (value.isNotEmpty())

  999.                 return value;

  1000.         }

  1001.         else if (xml->hasAttribute ("class"))

  1002.         {

  1003.             String::CharPointerType openBrace = findStyleItem (cssStyleText.getCharPointer(),

  1004.                                                                xml->getStringAttribute ("class").getCharPointer());

  1005. 

  1006.             if (! openBrace.isEmpty())

  1007.             {

  1008.                 String::CharPointerType closeBrace = CharacterFunctions::find (openBrace, (juce_wchar) '}');

  1009. 

  1010.                 if (closeBrace != openBrace)

  1011.                 {

  1012.                     const String value (getAttributeFromStyleList (String (openBrace + 1, closeBrace),

  1013.                                                                    attributeName, defaultValue));

  1014.                     if (value.isNotEmpty())

  1015.                         return value;

  1016.                 }

  1017.             }

  1018.         }

  1019. 

  1020.         if (xml.parent != nullptr)

  1021.             return getStyleAttribute (*xml.parent, attributeName, defaultValue);

  1022. 

  1023.         return defaultValue;

  1024.     }

  1025. 

  1026.     String getInheritedAttribute (const XmlPath& xml, StringRef attributeName) const

  1027.     {

  1028.         if (xml->hasAttribute (attributeName))

  1029.             return xml->getStringAttribute (attributeName);

  1030. 

  1031.         if (xml.parent != nullptr)

  1032.             return getInheritedAttribute  (*xml.parent, attributeName);

  1033. 

  1034.         return String();

  1035.     }

  1036. 

  1037.     static int parsePlacementFlags (const String& align) noexcept

  1038.     {

  1039.         if (align.isEmpty())

  1040.             return 0;

  1041. 

  1042.         if (align.containsIgnoreCase ("none"))

  1043.             return RectanglePlacement::stretchToFit;

  1044. 

  1045.         return (align.containsIgnoreCase ("slice") ? RectanglePlacement::fillDestination : 0)

  1046.              | (align.containsIgnoreCase ("xMin")  ? RectanglePlacement::xLeft

  1047.                                                    : (align.containsIgnoreCase ("xMax") ? RectanglePlacement::xRight

  1048.                                                                                         : RectanglePlacement::xMid))

  1049.              | (align.containsIgnoreCase ("yMin")  ? RectanglePlacement::yTop

  1050.                                                    : (align.containsIgnoreCase ("yMax") ? RectanglePlacement::yBottom

  1051.                                                                                         : RectanglePlacement::yMid));

  1052.     }

  1053. 

  1054.     //==============================================================================

  1055.     static bool isIdentifierChar (const juce_wchar c)

  1056.     {

  1057.         return CharacterFunctions::isLetter (c) || c == '-';

  1058.     }

  1059. 

  1060.     static String getAttributeFromStyleList (const String& list, StringRef attributeName, const String& defaultValue)

  1061.     {

  1062.         int i = 0;

  1063. 

  1064.         for (;;)

  1065.         {

  1066.             i = list.indexOf (i, attributeName);

  1067. 

  1068.             if (i < 0)

  1069.                 break;

  1070. 

  1071.             if ((i == 0 || (i > 0 && ! isIdentifierChar (list [i - 1])))

  1072.                  && ! isIdentifierChar (list [i + attributeName.length()]))

  1073.             {

  1074.                 i = list.indexOfChar (i, ':');

  1075. 

  1076.                 if (i < 0)

  1077.                     break;

  1078. 

  1079.                 int end = list.indexOfChar (i, ';');

  1080. 

  1081.                 if (end < 0)

  1082.                     end = 0x7ffff;

  1083. 

  1084.                 return list.substring (i + 1, end).trim();

  1085.             }

  1086. 

  1087.             ++i;

  1088.         }

  1089. 

  1090.         return defaultValue;

  1091.     }

  1092. 

  1093.     //==============================================================================

  1094.     static bool isStartOfNumber (juce_wchar c) noexcept

  1095.     {

  1096.         return CharacterFunctions::isDigit (c) || c == '-' || c == '+';

  1097.     }

  1098. 

  1099.     static bool parseNextNumber (String::CharPointerType& text, String& value, const bool allowUnits)

  1100.     {

  1101.         String::CharPointerType s (text);

  1102. 

  1103.         while (s.isWhitespace() || *s == ',')

  1104.             ++s;

  1105. 

  1106.         String::CharPointerType start (s);

  1107. 

  1108.         if (isStartOfNumber (*s))

  1109.             ++s;

  1110. 

  1111.         while (s.isDigit())

  1112.             ++s;

  1113. 

  1114.         if (*s == '.')

  1115.         {

  1116.             ++s;

  1117. 

  1118.             while (s.isDigit())

  1119.                 ++s;

  1120.         }

  1121. 

  1122.         if ((*s == 'e' || *s == 'E') && isStartOfNumber (s[1]))

  1123.         {

  1124.             s += 2;

  1125. 

  1126.             while (s.isDigit())

  1127.                 ++s;

  1128.         }

  1129. 

  1130.         if (allowUnits)

  1131.             while (s.isLetter())

  1132.                 ++s;

  1133. 

  1134.         if (s == start)

  1135.         {

  1136.             text = s;

  1137.             return false;

  1138.         }

  1139. 

  1140.         value = String (start, s);

  1141. 

  1142.         while (s.isWhitespace() || *s == ',')

  1143.             ++s;

  1144. 

  1145.         text = s;

  1146.         return true;

  1147.     }

  1148. 

  1149.     //==============================================================================

  1150.     static Colour parseColour (const String& s, int& index, const Colour defaultColour)

  1151.     {

  1152.         if (s [index] == '#')

  1153.         {

  1154.             uint32 hex[6] = { 0 };

  1155.             int numChars = 0;

  1156. 

  1157.             for (int i = 6; --i >= 0;)

  1158.             {

  1159.                 const int hexValue = CharacterFunctions::getHexDigitValue (s [++index]);

  1160. 

  1161.                 if (hexValue >= 0)

  1162.                     hex [numChars++] = (uint32) hexValue;

  1163.                 else

  1164.                     break;

  1165.             }

  1166. 

  1167.             if (numChars <= 3)

  1168.                 return Colour ((uint8) (hex [0] * 0x11),

  1169.                                (uint8) (hex [1] * 0x11),

  1170.                                (uint8) (hex [2] * 0x11));

  1171. 

  1172.             return Colour ((uint8) ((hex [0] << 4) + hex [1]),

  1173.                            (uint8) ((hex [2] << 4) + hex [3]),

  1174.                            (uint8) ((hex [4] << 4) + hex [5]));

  1175.         }

  1176. 

  1177.         if (s [index] == 'r'

  1178.               && s [index + 1] == 'g'

  1179.               && s [index + 2] == 'b')

  1180.         {

  1181.             const int openBracket = s.indexOfChar (index, '(');

  1182.             const int closeBracket = s.indexOfChar (openBracket, ')');

  1183. 

  1184.             if (openBracket >= 3 && closeBracket > openBracket)

  1185.             {

  1186.                 index = closeBracket;

  1187. 

  1188.                 StringArray tokens;

  1189.                 tokens.addTokens (s.substring (openBracket + 1, closeBracket), ",", "");

  1190.                 tokens.trim();

  1191.                 tokens.removeEmptyStrings();

  1192. 

  1193.                 if (tokens[0].containsChar ('%'))

  1194.                     return Colour ((uint8) roundToInt (2.55 * tokens[0].getDoubleValue()),

  1195.                                    (uint8) roundToInt (2.55 * tokens[1].getDoubleValue()),

  1196.                                    (uint8) roundToInt (2.55 * tokens[2].getDoubleValue()));

  1197.                 else

  1198.                     return Colour ((uint8) tokens[0].getIntValue(),

  1199.                                    (uint8) tokens[1].getIntValue(),

  1200.                                    (uint8) tokens[2].getIntValue());

  1201.             }

  1202.         }

  1203. 

  1204.         return Colours::findColourForName (s, defaultColour);

  1205.     }

  1206. 

  1207.     static AffineTransform parseTransform (String t)

  1208.     {

  1209.         AffineTransform result;

  1210. 

  1211.         while (t.isNotEmpty())

  1212.         {

  1213.             StringArray tokens;

  1214.             tokens.addTokens (t.fromFirstOccurrenceOf ("(", false, false)

  1215.                                .upToFirstOccurrenceOf (")", false, false),

  1216.                               ", ", "");

  1217. 

  1218.             tokens.removeEmptyStrings (true);

  1219. 

  1220.             float numbers[6];

  1221. 

  1222.             for (int i = 0; i < numElementsInArray (numbers); ++i)

  1223.                 numbers[i] = tokens[i].getFloatValue();

  1224. 

  1225.             AffineTransform trans;

  1226. 

  1227.             if (t.startsWithIgnoreCase ("matrix"))

  1228.             {

  1229.                 trans = AffineTransform (numbers[0], numbers[2], numbers[4],

  1230.                                          numbers[1], numbers[3], numbers[5]);

  1231.             }

  1232.             else if (t.startsWithIgnoreCase ("translate"))

  1233.             {

  1234.                 trans = AffineTransform::translation (numbers[0], numbers[1]);

  1235.             }

  1236.             else if (t.startsWithIgnoreCase ("scale"))

  1237.             {

  1238.                 trans = AffineTransform::scale (numbers[0], numbers[tokens.size() > 1 ? 1 : 0]);

  1239.             }

  1240.             else if (t.startsWithIgnoreCase ("rotate"))

  1241.             {

  1242.                 trans = AffineTransform::rotation (degreesToRadians (numbers[0]), numbers[1], numbers[2]);

  1243.             }

  1244.             else if (t.startsWithIgnoreCase ("skewX"))

  1245.             {

  1246.                 trans = AffineTransform::shear (std::tan (degreesToRadians (numbers[0])), 0.0f);

  1247.             }

  1248.             else if (t.startsWithIgnoreCase ("skewY"))

  1249.             {

  1250.                 trans = AffineTransform::shear (0.0f, std::tan (degreesToRadians (numbers[0])));

  1251.             }

  1252. 

  1253.             result = trans.followedBy (result);

  1254.             t = t.fromFirstOccurrenceOf (")", false, false).trimStart();

  1255.         }

  1256. 

  1257.         return result;

  1258.     }

  1259. 

  1260.     static void endpointToCentreParameters (const double x1, const double y1,

  1261.                                             const double x2, const double y2,

  1262.                                             const double angle,

  1263.                                             const bool largeArc, const bool sweep,

  1264.                                             double& rx, double& ry,

  1265.                                             double& centreX, double& centreY,

  1266.                                             double& startAngle, double& deltaAngle) noexcept

  1267.     {

  1268.         const double midX = (x1 - x2) * 0.5;

  1269.         const double midY = (y1 - y2) * 0.5;

  1270. 

  1271.         const double cosAngle = std::cos (angle);

  1272.         const double sinAngle = std::sin (angle);

  1273.         const double xp = cosAngle * midX + sinAngle * midY;

  1274.         const double yp = cosAngle * midY - sinAngle * midX;

  1275.         const double xp2 = xp * xp;

  1276.         const double yp2 = yp * yp;

  1277. 

  1278.         double rx2 = rx * rx;

  1279.         double ry2 = ry * ry;

  1280. 

  1281.         const double s = (xp2 / rx2) + (yp2 / ry2);

  1282.         double c;

  1283. 

  1284.         if (s <= 1.0)

  1285.         {

  1286.             c = std::sqrt (jmax (0.0, ((rx2 * ry2) - (rx2 * yp2) - (ry2 * xp2))

  1287.                                          / (( rx2 * yp2) + (ry2 * xp2))));

  1288. 

  1289.             if (largeArc == sweep)

  1290.                 c = -c;

  1291.         }

  1292.         else

  1293.         {

  1294.             const double s2 = std::sqrt (s);

  1295.             rx *= s2;

  1296.             ry *= s2;

  1297.             c = 0;

  1298.         }

  1299. 

  1300.         const double cpx = ((rx * yp) / ry) * c;

  1301.         const double cpy = ((-ry * xp) / rx) * c;

  1302. 

  1303.         centreX = ((x1 + x2) * 0.5) + (cosAngle * cpx) - (sinAngle * cpy);

  1304.         centreY = ((y1 + y2) * 0.5) + (sinAngle * cpx) + (cosAngle * cpy);

  1305. 

  1306.         const double ux = (xp - cpx) / rx;

  1307.         const double uy = (yp - cpy) / ry;

  1308.         const double vx = (-xp - cpx) / rx;

  1309.         const double vy = (-yp - cpy) / ry;

  1310. 

  1311.         const double length = juce_hypot (ux, uy);

  1312. 

  1313.         startAngle = acos (jlimit (-1.0, 1.0, ux / length));

  1314. 

  1315.         if (uy < 0)

  1316.             startAngle = -startAngle;

  1317. 

  1318.         startAngle += double_Pi * 0.5;

  1319. 

  1320.         deltaAngle = acos (jlimit (-1.0, 1.0, ((ux * vx) + (uy * vy))

  1321.                                                 / (length * juce_hypot (vx, vy))));

  1322. 

  1323.         if ((ux * vy) - (uy * vx) < 0)

  1324.             deltaAngle = -deltaAngle;

  1325. 

  1326.         if (sweep)

  1327.         {

  1328.             if (deltaAngle < 0)

  1329.                 deltaAngle += double_Pi * 2.0;

  1330.         }

  1331.         else

  1332.         {

  1333.             if (deltaAngle > 0)

  1334.                 deltaAngle -= double_Pi * 2.0;

  1335.         }

  1336. 

  1337.         deltaAngle = fmod (deltaAngle, double_Pi * 2.0);

  1338.     }

  1339. 

  1340.     template <typename OperationType>

  1341.     static bool findElementForId (const XmlPath& parent, const String& id, OperationType& op)

  1342.     {

  1343.         forEachXmlChildElement (*parent, e)

  1344.         {

  1345.             if (e->compareAttribute ("id", id))

  1346.             {

  1347.                 op (parent.getChild (e));

  1348.                 return true;

  1349.             }

  1350. 

  1351.             if (findElementForId (parent.getChild (e), id, op))

  1352.                 return true;

  1353.         }

  1354. 

  1355.         return false;

  1356.     }

  1357. 

  1358.     SVGState& operator= (const SVGState&) JUCE_DELETED_FUNCTION;

  1359. };

  1360. 

  1361. 

  1362. //==============================================================================

  1363. Drawable* Drawable::createFromSVG (const XmlElement& svgDocument)

  1364. {

  1365.     SVGState state (&svgDocument);

  1366.     return state.parseSVGElement (SVGState::XmlPath (&svgDocument, nullptr));

  1367. }

  1368. 

  1369. Path Drawable::parseSVGPath (const String& svgPath)

  1370. {

  1371.     SVGState state (nullptr);

  1372.     Path p;

  1373.     state.parsePathString (p, svgPath);

  1374.     return p;

  1375. }