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Diffstat (limited to 'node_modules/chroma-js/src/interpolate.coffee')
| -rw-r--r-- | node_modules/chroma-js/src/interpolate.coffee | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/node_modules/chroma-js/src/interpolate.coffee b/node_modules/chroma-js/src/interpolate.coffee new file mode 100644 index 0000000000..c4a081d287 --- /dev/null +++ b/node_modules/chroma-js/src/interpolate.coffee @@ -0,0 +1,36 @@ + + +### +interpolates between a set of colors uzing a bezier spline +### +bezier = (colors) -> + colors = (chroma(c) for c in colors) + if colors.length == 2 + # linear interpolation + [lab0, lab1] = (c.lab() for c in colors) + I = (t) -> + lab = (lab0[i] + t * (lab1[i] - lab0[i]) for i in [0..2]) + chroma.lab lab... + else if colors.length == 3 + # quadratic bezier interpolation + [lab0, lab1, lab2] = (c.lab() for c in colors) + I = (t) -> + lab = ((1-t)*(1-t) * lab0[i] + 2 * (1-t) * t * lab1[i] + t * t * lab2[i] for i in [0..2]) + chroma.lab lab... + else if colors.length == 4 + # cubic bezier interpolation + [lab0, lab1, lab2, lab3] = (c.lab() for c in colors) + I = (t) -> + lab = ((1-t)*(1-t)*(1-t) * lab0[i] + 3 * (1-t) * (1-t) * t * lab1[i] + 3 * (1-t) * t * t * lab2[i] + t*t*t * lab3[i] for i in [0..2]) + chroma.lab lab... + else if colors.length == 5 + I0 = bezier colors[0..2] + I1 = bezier colors[2..4] + I = (t) -> + if t < 0.5 + I0 t*2 + else + I1 (t-0.5)*2 + I + +chroma.interpolate.bezier = bezier
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