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PixelPaint: Support panning and scaling the image we're working on :^)

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ImageEditor now supports panning (Ctrl+MiddleMouse) and scaling (Wheel)
the image. This took a lot of unpleasant coordinate math, but now it
actually kinda works and feels awesome! :^)
This commit is contained in:
Andreas Kling 2020-05-20 22:29:04 +02:00
parent 58fa9c6e89
commit bf9e190533
4 changed files with 159 additions and 26 deletions
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11
Applications/PixelPaint/Image.cpp
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@ -49,17 +49,14 @@ Image::Image(const Gfx::Size& size)
{
}
void Image::paint_into(GUI::Painter& painter, const Gfx::Rect& dest_rect, const Gfx::Rect& src_rect)
void Image::paint_into(GUI::Painter& painter, const Gfx::Rect& dest_rect)
{
(void) src_rect;
float scale = (float)dest_rect.width() / (float)rect().width();
Gfx::PainterStateSaver saver(painter);
painter.add_clip_rect(dest_rect);
for (auto& layer : m_layers) {
auto target = dest_rect.translated(layer.location());
target.set_size(layer.size());
#ifdef IMAGE_DEBUG
dbg() << "Composite layer " << layer.name() << " target: " << target << ", layer.rect: " << layer.rect();
#endif
auto target = dest_rect.translated(layer.location().x() * scale, layer.location().y() * scale);
target.set_size(layer.size().width() * scale, layer.size().height() * scale);
painter.draw_scaled_bitmap(target, layer.bitmap(), layer.rect());
}
}