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Check for determinant singularity and handle separately.

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Jürg Lehni 2011-06-05 21:27:24 +01:00
parent 7d2742cd94
commit aef8dcf2d3
1 changed files with 4 additions and 3 deletions
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7
src/path/PathFitter.js
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@ -136,11 +136,12 @@ var PathFitter = Base.extend({
// Compute the determinants of C and X
var det_C0_C1 = C[0][0] * C[1][1] - C[1][0] * C[0][1],
det_C0_X = C[0][0] * X[1] - C[1][0] * X[0],
det_X_C1 = X[0] * C[1][1] - X[1] * C[0][1];
det_X_C1 = X[0] * C[1][1] - X[1] * C[0][1],
singularity = det_C0_C1 < Numerical.TOLERANCE;
// Finally, derive alpha values
var alpha_l = (det_C0_C1 == 0) ? 0.0 : det_X_C1 / det_C0_C1,
alpha_r = (det_C0_C1 == 0) ? 0.0 : det_C0_X / det_C0_C1;
var alpha_l = singularity ? 0 : det_X_C1 / det_C0_C1,
alpha_r = singularity ? 0 : det_C0_X / det_C0_C1;
// If alpha negative, use the Wu/Barsky heuristic (see text)
// (if alpha is 0, you get coincident control points that lead to