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improve positioning

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This commit is contained in:
Celogeek 2023-04-22 10:28:53 +02:00
parent 4a43760535
commit b27a826cd2
Signed by: celogeek
SSH Key Fingerprint: SHA256:njNJLzoLQdbV9PC6ehcruRb0QnEgxABoCYZ+0+aUIYc
1 changed files with 19 additions and 7 deletions
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26
internal/epub/filters/position.go
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@ -24,20 +24,32 @@ type positionFilter struct {
}
func (p *positionFilter) Bounds(srcBounds image.Rectangle) image.Rectangle {
return image.Rect(0, 0, p.viewWidth, p.viewHeight)
w, h := p.viewWidth, p.viewHeight
srcw, srch := srcBounds.Dx(), srcBounds.Dy()
if w <= 0 || h <= 0 || srcw <= 0 || srch <= 0 {
return image.Rect(0, 0, 0, 0)
}
return image.Rect(0, 0, w, h)
}
func (p *positionFilter) Draw(dst draw.Image, src image.Image, options *gift.Options) {
if dst.Bounds().Dx() == 0 || dst.Bounds().Dy() == 0 {
return
}
draw.Draw(dst, dst.Bounds(), image.White, dst.Bounds().Min, draw.Over)
srcBounds := src.Bounds()
left, top := (p.viewWidth-srcBounds.Dx())/2, (p.viewHeight-srcBounds.Dy())/2
if p.align == PositionLeft {
left = 0
left, top := 0, (dst.Bounds().Dy()-srcBounds.Dy())/2
if p.align == PositionCenter {
left = (dst.Bounds().Dx() - srcBounds.Dx()) / 2
}
if p.align == PositionRight {
left = p.viewWidth - srcBounds.Dx()
left = dst.Bounds().Dx() - srcBounds.Dx()
}
draw.Draw(
@ -45,8 +57,8 @@ func (p *positionFilter) Draw(dst draw.Image, src image.Image, options *gift.Opt
image.Rect(
left,
top,
p.viewWidth,
p.viewHeight,
dst.Bounds().Dx(),
dst.Bounds().Dy(),
),
src,
srcBounds.Min,