/* ============================================================================== This file is part of the JUCE library. Copyright (c) 2013 - Raw Material Software Ltd. Permission is granted to use this software under the terms of either: a) the GPL v2 (or any later version) b) the Affero GPL v3 Details of these licenses can be found at: www.gnu.org/licenses JUCE is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. ------------------------------------------------------------------------------ To release a closed-source product which uses JUCE, commercial licenses are available: visit www.juce.com for more information. ============================================================================== */ #ifndef JUCE_DRAWABLE_H_INCLUDED #define JUCE_DRAWABLE_H_INCLUDED //============================================================================== /** The base class for objects which can draw themselves, e.g. polygons, images, etc. @see DrawableComposite, DrawableImage, DrawablePath, DrawableText */ class JUCE_API Drawable : public Component { protected: //============================================================================== /** The base class can't be instantiated directly. @see DrawableComposite, DrawableImage, DrawablePath, DrawableText */ Drawable(); public: /** Destructor. */ virtual ~Drawable(); //============================================================================== /** Creates a deep copy of this Drawable object. Use this to create a new copy of this and any sub-objects in the tree. */ virtual Drawable* createCopy() const = 0; //============================================================================== /** Renders this Drawable object. Note that the preferred way to render a drawable in future is by using it as a component and adding it to a parent, so you might want to consider that before using this method. @see drawWithin */ void draw (Graphics& g, float opacity, const AffineTransform& transform = AffineTransform::identity) const; /** Renders the Drawable at a given offset within the Graphics context. The coordinates passed-in are used to translate the object relative to its own origin before drawing it - this is basically a quick way of saying: @code draw (g, AffineTransform::translation (x, y)). @endcode Note that the preferred way to render a drawable in future is by using it as a component and adding it to a parent, so you might want to consider that before using this method. */ void drawAt (Graphics& g, float x, float y, float opacity) const; /** Renders the Drawable within a rectangle, scaling it to fit neatly inside without changing its aspect-ratio. The object can placed arbitrarily within the rectangle based on a Justification type, and can either be made as big as possible, or just reduced to fit. Note that the preferred way to render a drawable in future is by using it as a component and adding it to a parent, so you might want to consider that before using this method. @param g the graphics context to render onto @param destArea the target rectangle to fit the drawable into @param placement defines the alignment and rescaling to use to fit this object within the target rectangle. @param opacity the opacity to use, in the range 0 to 1.0 */ void drawWithin (Graphics& g, const Rectangle& destArea, RectanglePlacement placement, float opacity) const; //============================================================================== /** Resets any transformations on this drawable, and positions its origin within its parent component. */ void setOriginWithOriginalSize (Point originWithinParent); /** Sets a transform for this drawable that will position it within the specified area of its parent component. */ void setTransformToFit (const Rectangle& areaInParent, RectanglePlacement placement); /** Returns the DrawableComposite that contains this object, if there is one. */ DrawableComposite* getParent() const; //============================================================================== /** Tries to turn some kind of image file into a drawable. The data could be an image that the ImageFileFormat class understands, or it could be SVG. */ static Drawable* createFromImageData (const void* data, size_t numBytes); /** Tries to turn a stream containing some kind of image data into a drawable. The data could be an image that the ImageFileFormat class understands, or it could be SVG. */ static Drawable* createFromImageDataStream (InputStream& dataSource); /** Tries to turn a file containing some kind of image data into a drawable. The data could be an image that the ImageFileFormat class understands, or it could be SVG. */ static Drawable* createFromImageFile (const File& file); /** Attempts to parse an SVG (Scalable Vector Graphics) document, and to turn this into a Drawable tree. The object returned must be deleted by the caller. If something goes wrong while parsing, it may return nullptr. SVG is a pretty large and complex spec, and this doesn't aim to be a full implementation, but it can return the basic vector objects. */ static Drawable* createFromSVG (const XmlElement& svgDocument); /** Parses an SVG path string and returns it. */ static Path parseSVGPath (const String& svgPath); //============================================================================== /** Tries to create a Drawable from a previously-saved ValueTree. The ValueTree must have been created by the createValueTree() method. If there are any images used within the drawable, you'll need to provide a valid ImageProvider object that can be used to retrieve these images from whatever type of identifier is used to represent them. Internally, this uses a ComponentBuilder, and registerDrawableTypeHandlers(). */ static Drawable* createFromValueTree (const ValueTree& tree, ComponentBuilder::ImageProvider* imageProvider); /** Creates a ValueTree to represent this Drawable. The ValueTree that is returned can be turned back into a Drawable with createFromValueTree(). If there are any images used in this drawable, you'll need to provide a valid ImageProvider object that can be used to create storable representations of them. */ virtual ValueTree createValueTree (ComponentBuilder::ImageProvider* imageProvider) const = 0; /** Returns the area that this drawble covers. The result is expressed in this drawable's own coordinate space, and does not take into account any transforms that may be applied to the component. */ virtual Rectangle getDrawableBounds() const = 0; /** Recursively replaces a colour that might be used for filling or stroking. return true if any instances of this colour were found. */ virtual bool replaceColour (Colour originalColour, Colour replacementColour); //============================================================================== /** Internal class used to manage ValueTrees that represent Drawables. */ class ValueTreeWrapperBase { public: ValueTreeWrapperBase (const ValueTree& state); ValueTree& getState() noexcept { return state; } String getID() const; void setID (const String& newID); ValueTree state; }; //============================================================================== /** Registers a set of ComponentBuilder::TypeHandler objects that can be used to load all the different Drawable types from a saved state. @see ComponentBuilder::registerTypeHandler() */ static void registerDrawableTypeHandlers (ComponentBuilder& componentBuilder); protected: //============================================================================== friend class DrawableComposite; friend class DrawableShape; /** @internal */ void transformContextToCorrectOrigin (Graphics&); /** @internal */ void parentHierarchyChanged() override; /** @internal */ void setBoundsToEnclose (const Rectangle&); Point originRelativeToComponent; #ifndef DOXYGEN /** Internal utility class used by Drawables. */ template class Positioner : public RelativeCoordinatePositionerBase { public: Positioner (DrawableType& c) : RelativeCoordinatePositionerBase (c), owner (c) {} bool registerCoordinates() override { return owner.registerCoordinates (*this); } void applyToComponentBounds() override { ComponentScope scope (getComponent()); owner.recalculateCoordinates (&scope); } void applyNewBounds (const Rectangle&) override { jassertfalse; // drawables can't be resized directly! } private: DrawableType& owner; JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (Positioner) }; Drawable (const Drawable&); #endif private: void nonConstDraw (Graphics&, float opacity, const AffineTransform&); Drawable& operator= (const Drawable&); JUCE_LEAK_DETECTOR (Drawable) }; #endif // JUCE_DRAWABLE_H_INCLUDED