scratchfoundation/paper.js
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Clean up getParameter() code.

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This commit is contained in:
Jürg Lehni 2011-03-07 11:51:01 +00:00
parent 0ddfc9ef33
commit 1e8dffac08
1 changed files with 7 additions and 4 deletions
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11
src/path/Curve.js
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@ -341,16 +341,18 @@ var Curve = this.Curve = Base.extend({
// Let's use the Van Wijngaarden–Dekker–Brent Method to find
// solutions more reliably than with False Position Method.
// The precision of 5 iterations seems enough for this
// See if we're going backwards and handle case differently
var a, b, f,
forward = length > 0,
var forward = length > 0,
// Use integrand to calculate both range length and part
// lengths in f(t) below.
ds = getLengthIntegrand(
p1x, p1y, c1x, c1y, c2x, c2y, p2x, p2y);
p1x, p1y, c1x, c1y, c2x, c2y, p2x, p2y),
a, b, f;
// See if we're going forward or backward, and handle cases
// differently
if (forward) { // Normal way
a = t;
b = 1;
// We're moving b to the right to find root for length
f = function(t) {
return length - Numerical.integrate(ds, a, t, 5);
}
@ -358,6 +360,7 @@ var Curve = this.Curve = Base.extend({
a = 0;
b = t;
length = -length;
// We're moving a to the left to find root for length
f = function(t) {
return length - Numerical.integrate(ds, t, b, 5);
}