67 lines
2 KiB
JavaScript
67 lines
2 KiB
JavaScript
/**
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* @class Ext.util.LineSegment
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*
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* Utility class that represents a line segment, constructed by two {@link Ext.util.Point}
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*/
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Ext.define('Ext.util.LineSegment', {
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requires: ['Ext.util.Point'],
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/**
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* Creates new LineSegment out of two points.
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* @param {Ext.util.Point} point1
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* @param {Ext.util.Point} point2
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*/
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constructor: function(point1, point2) {
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var Point = Ext.util.Point;
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this.point1 = Point.from(point1);
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this.point2 = Point.from(point2);
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},
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/**
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* Returns the point where two lines intersect.
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* @param {Ext.util.LineSegment} lineSegment The line to intersect with.
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* @return {Ext.util.Point}
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*/
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intersects: function(lineSegment) {
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var point1 = this.point1,
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point2 = this.point2,
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point3 = lineSegment.point1,
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point4 = lineSegment.point2,
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x1 = point1.x,
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x2 = point2.x,
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x3 = point3.x,
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x4 = point4.x,
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y1 = point1.y,
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y2 = point2.y,
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y3 = point3.y,
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y4 = point4.y,
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d = (x1 - x2) * (y3 - y4) - (y1 - y2) * (x3 - x4),
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xi, yi;
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if (d == 0) {
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return null;
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}
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xi = ((x3 - x4) * (x1 * y2 - y1 * x2) - (x1 - x2) * (x3 * y4 - y3 * x4)) / d;
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yi = ((y3 - y4) * (x1 * y2 - y1 * x2) - (y1 - y2) * (x3 * y4 - y3 * x4)) / d;
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if (xi < Math.min(x1, x2) || xi > Math.max(x1, x2)
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|| xi < Math.min(x3, x4) || xi > Math.max(x3, x4)
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|| yi < Math.min(y1, y2) || yi > Math.max(y1, y2)
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|| yi < Math.min(y3, y4) || yi > Math.max(y3, y4)) {
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return null;
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}
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return new Ext.util.Point(xi, yi);
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},
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/**
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* Returns string representation of the line. Useful for debugging.
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* @return {String} For example `Point[12,8] Point[0,0]`
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*/
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toString: function() {
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return this.point1.toString() + " " + this.point2.toString();
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}
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});
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