JUCE/modules/juce_graphics/placement/juce_RectanglePlacement.cpp

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

   This file is part of the JUCE library.
   Copyright (c) 2015 - ROLI 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.

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

RectanglePlacement::RectanglePlacement (const RectanglePlacement& other) noexcept
    : flags (other.flags)
{
}

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

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 || h == 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);
}