flymis/WebRoot/dojojs/src/math/curves.js

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/*
	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.curves");
dojo.require("dojo.math");

/* Curves from Dan's 13th lib stuff.
 * See: http://pupius.co.uk/js/Toolkit.Drawing.js
 *      http://pupius.co.uk/dump/dojo/Dojo.Math.js
 */

dojo.math.curves = {
	Line: function(/* array */start, /* array */end) {
		//	summary
		//	Creates a straight line object
		this.start = start;
		this.end = end;
		this.dimensions = start.length;

		for(var i = 0; i < start.length; i++) {
			start[i] = Number(start[i]);
		}

		for(var i = 0; i < end.length; i++) {
			end[i] = Number(end[i]);
		}

		//simple function to find point on an n-dimensional, straight line
		this.getValue = function(/* float */n){
			//	summary
			//	Returns the point at point N (in terms of percentage) on this line.
			var retVal = new Array(this.dimensions);
			for(var i=0;i<this.dimensions;i++)
				retVal[i] = ((this.end[i] - this.start[i]) * n) + this.start[i];
			return retVal;	//	array
		}
		return this;	//	dojo.math.curves.Line
	},

	Bezier: function(/* array */pnts) {
		//	summary
		//	Creates a bezier curve
		//	Takes an array of points, the first is the start point, the last is end point and the ones in
		//	between are the Bezier control points.
		this.getValue = function(/* float */step) {
			//	summary
			//	Returns the point at point N (in terms of percentage) on this curve.
			if(step >= 1) return this.p[this.p.length-1];	// if step>=1 we must be at the end of the curve
			if(step <= 0) return this.p[0];					// if step<=0 we must be at the start of the curve
			var retVal = new Array(this.p[0].length);
			for(var k=0;j<this.p[0].length;k++) { retVal[k]=0; }
			for(var j=0;j<this.p[0].length;j++) {
				var C=0; var D=0;