34 lines
1.2 KiB
Go
34 lines
1.2 KiB
Go
package math
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import (
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"golang.org/x/exp/constraints"
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)
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func Lerp[T constraints.Integer | constraints.Float](start, end T, ratio float64) T {
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return start + T((float64(end)-float64(start))*ratio)
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}
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func LerpVector2[T ~int64 | ~float64](start, end Vector2[T], ratio float64) Vector2[T] {
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return start.AddVector(Vector2ToType[float64, T](end.SubVector(start).Float64().Multiply(ratio)))
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}
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func LerpColor(start, end Color, ratio float64) Color {
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return Color{
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R: Lerp(start.R, end.R, ratio),
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G: Lerp(start.G, end.G, ratio),
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B: Lerp(start.B, end.B, ratio),
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Alpha: Lerp(start.Alpha, end.Alpha, ratio),
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}
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}
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func LerpMatrix(start, end MatrixTransform, ratio float64) MatrixTransform {
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// TODO: Lerping a matrix element-wise is geometrically wrong,
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// but I doubt Flash is decomposing the matrix into scale-rotate-translate?
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return NewMatrixTransform(
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LerpVector2(NewVector2(start.GetA(), start.GetD()), NewVector2(end.GetA(), end.GetD()), ratio),
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LerpVector2(NewVector2(start.GetB(), start.GetC()), NewVector2(end.GetB(), end.GetC()), ratio),
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LerpVector2(NewVector2(start.GetTX(), start.GetTY()), NewVector2(end.GetTX(), end.GetTY()), ratio),
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)
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}
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