Carla/source/modules/juce_gui_basics/positioning/juce_RelativeParallelogram.cpp

/*
  ==============================================================================

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2017 - ROLI Ltd.

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For this technical preview, this file is not subject to commercial licensing.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

RelativeParallelogram::RelativeParallelogram()
{
}

RelativeParallelogram::RelativeParallelogram (const Rectangle<float>& r)
    : topLeft (r.getTopLeft()), topRight (r.getTopRight()), bottomLeft (r.getBottomLeft())
{
}

RelativeParallelogram::RelativeParallelogram (const RelativePoint& topLeft_, const RelativePoint& topRight_, const RelativePoint& bottomLeft_)
    : topLeft (topLeft_), topRight (topRight_), bottomLeft (bottomLeft_)
{
}

RelativeParallelogram::RelativeParallelogram (const String& topLeft_, const String& topRight_, const String& bottomLeft_)
    : topLeft (topLeft_), topRight (topRight_), bottomLeft (bottomLeft_)
{
}

RelativeParallelogram::~RelativeParallelogram()
{
}

void RelativeParallelogram::resolveThreePoints (Point<float>* points, Expression::Scope* const scope) const
{
    points[0] = topLeft.resolve (scope);
    points[1] = topRight.resolve (scope);
    points[2] = bottomLeft.resolve (scope);
}

void RelativeParallelogram::resolveFourCorners (Point<float>* points, Expression::Scope* const scope) const
{
    resolveThreePoints (points, scope);
    points[3] = points[1] + (points[2] - points[0]);
}

const Rectangle<float> RelativeParallelogram::getBounds (Expression::Scope* const scope) const
{
    Point<float> points[4];
    resolveFourCorners (points, scope);
    return Rectangle<float>::findAreaContainingPoints (points, 4);
}

void RelativeParallelogram::getPath (Path& path, Expression::Scope* const scope) const
{
    Point<float> points[4];
    resolveFourCorners (points, scope);

    path.startNewSubPath (points[0]);
    path.lineTo (points[1]);
    path.lineTo (points[3]);
    path.lineTo (points[2]);
    path.closeSubPath();
}

AffineTransform RelativeParallelogram::resetToPerpendicular (Expression::Scope* const scope)
{
    Point<float> corners[3];
    resolveThreePoints (corners, scope);

    const Line<float> top (corners[0], corners[1]);
    const Line<float> left (corners[0], corners[2]);
    const Point<float> newTopRight (corners[0] + Point<float> (top.getLength(), 0.0f));
    const Point<float> newBottomLeft (corners[0] + Point<float> (0.0f, left.getLength()));

    topRight.moveToAbsolute (newTopRight, scope);
    bottomLeft.moveToAbsolute (newBottomLeft, scope);

    return AffineTransform::fromTargetPoints (corners[0], corners[0],
                                              corners[1], newTopRight,
                                              corners[2], newBottomLeft);
}

bool RelativeParallelogram::isDynamic() const
{
    return topLeft.isDynamic() || topRight.isDynamic() || bottomLeft.isDynamic();
}

bool RelativeParallelogram::operator== (const RelativeParallelogram& other) const noexcept
{
    return topLeft == other.topLeft && topRight == other.topRight && bottomLeft == other.bottomLeft;
}

bool RelativeParallelogram::operator!= (const RelativeParallelogram& other) const noexcept
{
    return ! operator== (other);
}

Point<float> RelativeParallelogram::getInternalCoordForPoint (const Point<float>* const corners, Point<float> target) noexcept
{
    const Point<float> tr (corners[1] - corners[0]);
    const Point<float> bl (corners[2] - corners[0]);
    target -= corners[0];

    return Point<float> (Line<float> (Point<float>(), tr).getIntersection (Line<float> (target, target - bl)).getDistanceFromOrigin(),
                         Line<float> (Point<float>(), bl).getIntersection (Line<float> (target, target - tr)).getDistanceFromOrigin());
}

Point<float> RelativeParallelogram::getPointForInternalCoord (const Point<float>* const corners, const Point<float> point) noexcept
{
    return corners[0]
            + Line<float> (Point<float>(), corners[1] - corners[0]).getPointAlongLine (point.x)
            + Line<float> (Point<float>(), corners[2] - corners[0]).getPointAlongLine (point.y);
}

Rectangle<float> RelativeParallelogram::getBoundingBox (const Point<float>* const p) noexcept
{
    const Point<float> points[] = { p[0], p[1], p[2], p[1] + (p[2] - p[0]) };
    return Rectangle<float>::findAreaContainingPoints (points, 4);
}

} // namespace juce