1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586 |
- goog.provide('goog.math.paths');
- goog.require('goog.math.Coordinate');
- goog.require('goog.math.Path');
- goog.math.paths.createRegularNGon = function(center, vertex, n) {
- var path = new goog.math.Path();
- path.moveTo(vertex.x, vertex.y);
- var startAngle = Math.atan2(vertex.y - center.y, vertex.x - center.x);
- var radius = goog.math.Coordinate.distance(center, vertex);
- for (var i = 1; i < n; i++) {
- var angle = startAngle + 2 * Math.PI * (i / n);
- path.lineTo(
- center.x + radius * Math.cos(angle),
- center.y + radius * Math.sin(angle));
- }
- path.close();
- return path;
- };
- goog.math.paths.createArrow = function(a, b, aHead, bHead) {
- var path = new goog.math.Path();
- path.moveTo(a.x, a.y);
- path.lineTo(b.x, b.y);
- var angle = Math.atan2(b.y - a.y, b.x - a.x);
- if (aHead) {
- path.appendPath(
- goog.math.paths.createRegularNGon(
- new goog.math.Coordinate(
- a.x + aHead * Math.cos(angle), a.y + aHead * Math.sin(angle)),
- a, 3));
- }
- if (bHead) {
- path.appendPath(
- goog.math.paths.createRegularNGon(
- new goog.math.Coordinate(
- b.x + bHead * Math.cos(angle + Math.PI),
- b.y + bHead * Math.sin(angle + Math.PI)),
- b, 3));
- }
- return path;
- };
|