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examples/highdpi: Add comments

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Hajime Hoshi 2018-01-28 21:35:32 +09:00
parent 58997097d6
commit 5224063af9
1 changed files with 5 additions and 0 deletions
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5
examples/highdpi/main.go
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@ -64,12 +64,17 @@ func update(screen *ebiten.Image) error {
w, h := highDPIImage.Size()
op := &ebiten.DrawImageOptions{}
// Move the images's center to the upper left corner.
op.GeoM.Translate(float64(-w)/2, float64(-h)/2)
// The image is just too big. Adjust the scale.
op.GeoM.Scale(0.25, 0.25)
// Scale the image by the device ratio so that the rendering result can be same
// on various (diffrent-DPI) environments.
op.GeoM.Scale(scale, scale)
// Move the image's center to the screen's center.
op.GeoM.Translate(float64(sw)/2, float64(sh)/2)
screen.DrawImage(highDPIImage, op)