55 lines
1.6 KiB
Go
55 lines
1.6 KiB
Go
package tins2021
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import (
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"opslag.de/schobers/geom"
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"opslag.de/schobers/zntg/ui"
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)
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type AnimatedTexture struct {
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texture NamedTexture
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animation ui.Texture
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frames []geom.RectangleF32
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}
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func newAnimatedTexture(texture NamedTexture, animation ui.Texture, n int) AnimatedTexture {
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frames := make([]geom.RectangleF32, 0, n)
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height := float32(animation.Height())
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width := float32(animation.Width())
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for i := 0; i < n; i++ {
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left := width * float32(i) / float32(n)
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right := width * float32(i+1) / float32(n)
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frames = append(frames, geom.RectF32(left, 0, right, height))
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}
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return AnimatedTexture{texture: texture, animation: animation, frames: frames}
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}
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func NewAnimatedTexture(texture NamedTexture, n int) AnimatedTexture {
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return newAnimatedTexture(texture, texture.Texture(), n)
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}
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func FitAnimatedTexture(texture NamedTexture, scale float32, n int) AnimatedTexture {
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height := float32(texture.Texture().Height())
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scale = ScaleRound(height, scale)
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return newAnimatedTexture(texture, texture.Scaled(scale), n)
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}
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func (t AnimatedTexture) Draw(renderer ui.Renderer, pos geom.PointF32, frame int) {
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renderer.DrawTexturePointOptions(t.animation, pos, ui.DrawOptions{Source: &t.frames[frame]})
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}
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func (t AnimatedTexture) FrameSize(i int) geom.PointF32 { return t.frames[i].Size() }
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func (t AnimatedTexture) Frames() int { return len(t.frames) }
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func (t AnimatedTexture) Scale(scale float32) AnimatedTexture {
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return FitAnimatedTexture(t.texture, scale, t.Frames())
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}
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func FindScaleRound(length, desired float32) float32 {
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return ScaleRound(length, desired/length)
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}
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func ScaleRound(length, scale float32) float32 {
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return geom.Round32(length*scale) / length
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}
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