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_intersectLine returns a point

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hkrish 2013-05-03 19:41:31 +02:00
parent 3804531906
commit b966aafd0f
1 changed files with 5 additions and 4 deletions
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9
fatline/Intersect.js
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@ -54,6 +54,7 @@ function _clipFatLine( v1, v2, t1, t2, u1, u2, tdiff, udiff, tvalue, curve1, cur
var dq3 = new Point( 1.0, lp.getSide(q3) * lp.getDistance(q3) );
// Ideally we need to calculate the convex hull for D(ti, di(t))
// here we are just checking against all possibilities
var Dt = [
new Line( dq0, dq1, false ),
new Line( dq1, dq2, false ),
@ -180,12 +181,12 @@ function signum(num) {
return ( num > 0 )? 1 : ( num < 0 )? -1 : 0;
}
var _addLineIntersections = function(v1, v2, curve, locations) {
var _intersectLines = function(v1, v2) {
var result, a1x, a2x, b1x, b2x, a1y, a2y, b1y, b2y;
a1x = v1[0]; a1y = v1[1];
a2x = v1[6]; a2y = v1[7];
a2x = v1[2]; a2y = v1[3];
b1x = v2[0]; b1y = v2[1];
b2x = v2[6]; b2y = v2[7];
b2x = v2[3]; b2y = v2[3];
var ua_t = (b2x - b1x) * (a1y - b1y) - (b2y - b1y) * (a1x - b1x);
var ub_t = (a2x - a1x) * (a1y - b1y) - (a2y - a1y) * (a1x - b1x);
var u_b = (b2y - b1y) * (a2x - a1x) - (b2x - b1x) * (a2y - a1y);
@ -193,7 +194,7 @@ var _addLineIntersections = function(v1, v2, curve, locations) {
var ua = ua_t / u_b;
var ub = ub_t / u_b;
if ( 0 <= ua && ua <= 1 && 0 <= ub && ub <= 1 ) {
locations.push( new CurveLocation(curve, null, new Point(a1x + ua * (a2x - a1x), a1y + ua * (a2y - a1y))) );
return new Point(a1x + ua * (a2x - a1x), a1y + ua * (a2y - a1y));
}
}
};