Carla/source/modules/juce_graphics/placement/juce_RectanglePlacement.cpp

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

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

   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
{

bool RectanglePlacement::operator== (const RectanglePlacement& other) const noexcept
{
    return flags == other.flags;
}

bool RectanglePlacement::operator!= (const RectanglePlacement& other) const noexcept
{
    return flags != other.flags;
}

void RectanglePlacement::applyTo (double& x, double& y, double& w, double& h,
                                  const double dx, const double dy, const double dw, const double dh) const noexcept
{
    if (w == 0.0 || h == 0.0)
        return;

    if ((flags & stretchToFit) != 0)
    {
        x = dx;
        y = dy;
        w = dw;
        h = dh;
    }
    else
    {
        double scale = (flags & fillDestination) != 0 ? jmax (dw / w, dh / h)
                                                      : jmin (dw / w, dh / h);

        if ((flags & onlyReduceInSize) != 0)
            scale = jmin (scale, 1.0);

        if ((flags & onlyIncreaseInSize) != 0)
            scale = jmax (scale, 1.0);

        w *= scale;
        h *= scale;

        if ((flags & xLeft) != 0)
            x = dx;
        else if ((flags & xRight) != 0)
            x = dx + dw - w;
        else
            x = dx + (dw - w) * 0.5;

        if ((flags & yTop) != 0)
            y = dy;
        else if ((flags & yBottom) != 0)
            y = dy + dh - h;
        else
            y = dy + (dh - h) * 0.5;
    }
}

AffineTransform RectanglePlacement::getTransformToFit (const Rectangle<float>& source, const Rectangle<float>& destination) const noexcept
{
    if (source.isEmpty())
        return AffineTransform();

    float newX = destination.getX();
    float newY = destination.getY();

    float scaleX = destination.getWidth() / source.getWidth();
    float scaleY = destination.getHeight() / source.getHeight();

    if ((flags & stretchToFit) == 0)
    {
        scaleX = (flags & fillDestination) != 0 ? jmax (scaleX, scaleY)
                                                : jmin (scaleX, scaleY);

        if ((flags & onlyReduceInSize) != 0)
            scaleX = jmin (scaleX, 1.0f);

        if ((flags & onlyIncreaseInSize) != 0)
            scaleX = jmax (scaleX, 1.0f);

        scaleY = scaleX;

        if ((flags & xRight) != 0)
            newX += destination.getWidth() - source.getWidth() * scaleX;             // right
        else if ((flags & xLeft) == 0)
            newX += (destination.getWidth() - source.getWidth() * scaleX) / 2.0f;    // centre

        if ((flags & yBottom) != 0)
            newY += destination.getHeight() - source.getHeight() * scaleX;             // bottom
        else if ((flags & yTop) == 0)
            newY += (destination.getHeight() - source.getHeight() * scaleX) / 2.0f;    // centre
    }

    return AffineTransform::translation (-source.getX(), -source.getY())
                .scaled (scaleX, scaleY)
                .translated (newX, newY);
}

} // namespace juce