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Define Line#getDistance(point).

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This commit is contained in:
Jürg Lehni 2011-06-05 21:24:38 +01:00
parent 28c680ac94
commit df29ef2d2c
1 changed files with 16 additions and 2 deletions
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18
src/basic/Line.js
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@ -74,8 +74,7 @@ var Line = this.Line = Base.extend({
*/ */
intersect: function(line) { intersect: function(line) {
var cross = this.vector.cross(line.vector); var cross = this.vector.cross(line.vector);
// Epsilon tolerance if (Math.abs(cross) <= Numerical.TOLERANCE)
if (Math.abs(cross) <= 10e-6)
return null; return null;
var v = line.point.subtract(this.point), var v = line.point.subtract(this.point),
t1 = v.cross(line.vector) / cross, t1 = v.cross(line.vector) / cross,
@ -105,5 +104,20 @@ var Line = this.Line = Base.extend({
} }
} }
return ccw < 0 ? -1 : ccw > 0 ? 1 : 0; return ccw < 0 ? -1 : ccw > 0 ? 1 : 0;
},
// DOCS: document Line#getDistance(point)
/**
* @param {Point} point
* @return {Number}
*/
getDistance: function(point) {
var m = this.vector.y / this.vector.x, // slope
b = this.point.y - (m * this.point.x); // y offset
// Distance to the linear equation
var dist = Math.abs(point.y - (m * point.x) - b) / Math.sqrt(m * m + 1);
return this.infinite ? dist : Math.min(dist,
point.getDistance(this.point),
point.getDistance(this.point.add(this.vector)));
} }
}); });