sanspie
515f4ca1b3
Clips (.aeanim) and controllers (.aectrl) with importers, AnimationPlayer and Animator with crossfades, root motion and events on fixed steps, rewind support. Editor: Animation panel (dope sheet, curves, record, preview, trajectory), Animator panel, sprite sheet slicer and flipbooks, Programming workspace, export panel redesign. Motion 2D ledge climb. 11c: the component and Create palette.
22 lines
761 B
Go
22 lines
761 B
Go
package anim
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// RootDelta is the change of a root track between two clip times: a looping clip adds its end minus its start for every cycle crossed, a ping-pong clip only moves back and forth.
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func RootDelta(c *Clip, s *Sampler, track int, loop LoopMode, t0, t1 float64) [2]float32 {
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if !(c.Length > 0) || t0 == t1 || track < 0 || track >= len(c.Tracks) {
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return [2]float32{}
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}
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u0, k0 := c.Local(loop, t0)
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u1, k1 := c.Local(loop, t1)
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a := s.Track(c, track, u0).L
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b := s.Track(c, track, u1).L
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d := [2]float32{b[0] - a[0], b[1] - a[1]}
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if loop == LoopRepeat && k1 != k0 {
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start := s.Track(c, track, 0).L
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end := s.Track(c, track, c.Length).L
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n := float32(k1 - k0)
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d[0] += n * (end[0] - start[0])
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d[1] += n * (end[1] - start[1])
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}
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return d
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}
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