points.js

初学者

/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/



dojo.provide("dojo.math.points");
dojo.require("dojo.math");
dojo.math.points = {translate:function (a, b) {
	if (a.length != b.length) {
		dojo.raise("dojo.math.translate: points not same size (a:[" + a + "], b:[" + b + "])");
	}
	var c = new Array(a.length);
	for (var i = 0; i < a.length; i++) {
		c[i] = a[i] + b[i];
	}
	return c;
}, midpoint:function (a, b) {
	if (a.length != b.length) {
		dojo.raise("dojo.math.midpoint: points not same size (a:[" + a + "], b:[" + b + "])");
	}
	var c = new Array(a.length);
	for (var i = 0; i < a.length; i++) {
		c[i] = (a[i] + b[i]) / 2;
	}
	return c;
}, invert:function (a) {
	var b = new Array(a.length);
	for (var i = 0; i < a.length; i++) {
		b[i] = -a[i];
	}
	return b;
}, distance:function (a, b) {
	return Math.sqrt(Math.pow(b[0] - a[0], 2) + Math.pow(b[1] - a[1], 2));
}};