Created
March 19, 2012 12:59
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Drawing curves.. demo and reference
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| /********************************************************************* | |
| * Licensed under the Open Software License version 3.0 * | |
| * * | |
| * This Open Software License (OSL-3.0) applies to any original work * | |
| * of authorship "vfold" whose owner Raphael Varonos has placed the * | |
| * following licensing notice adjacent to the copyright notice for * | |
| * the Original Work * | |
| *********************************************************************/ | |
| /****************************************************** | |
| * Testing custom curve functions | |
| ******************************************************/ | |
| draw.move(10, 100); | |
| draw.curve(40, 10, 100, 100); | |
| function Draw() { | |
| /****************************************************** | |
| * Create canvas to draw elements | |
| ******************************************************/ | |
| var canvas, context; | |
| canvas = document.createElement("canvas"); | |
| canvas.setAttribute("width", window.innerWidth); | |
| canvas.setAttribute("height", window.innerHeight); | |
| canvas.setAttribute("style", "position: absolute; x:0; y:0;"); | |
| document.body.appendChild(canvas); | |
| context = canvas.getContext(2d), | |
| this.curve = function() { | |
| }; | |
| this.line = function() { | |
| } | |
| function Curve(PointStart, PointControl, PointEnd) { | |
| /****************************************************** | |
| * Declare private vars | |
| ******************************************************/ | |
| var | |
| time, time1, time2, pointStart, pointControl, pointEnd, constraint1, constraint2, pointDraw, smooth1 = 1, | |
| smooth2 = 1; | |
| time1 = (1 + smooth2) / 2; | |
| time2 = (1 - smooth1) / 2; | |
| constraint1 = time≤time1 ? add(pointStart, multiply(time / time1, add((pointControl, -pointStart)))) : pointControl | |
| constraint2 = time≥time2 ? add(pointControl, multiply(time - time2) / (1 - time2), add(pointEnd, -pointControl))): pointControl | |
| pointDraw = add(constraint1, multiply(time, add(constraint2, -constraint1))); | |
| // If time is between 0-1 then point is on the curve. I think! | |
| // if time<=time1 | |
| } | |
| Point.count = 0; | |
| function Point() { | |
| var x = 0, | |
| y = 0; | |
| this.name = "Point" + (Point++); | |
| this.move = function(X, Y) { | |
| x = X; | |
| y = Y; | |
| context.beginPath(); | |
| context.arc(x, y, 20, 0, Math.PI * 2); | |
| context.fill(); | |
| } | |
| } | |
| function drawPixel(x, y) { | |
| context.fillRect(x, y, 1, 1); | |
| } | |
| function drawPoint(x, y) { | |
| } | |
| function add(value1, value2) { | |
| return { | |
| "x": value1.x + value2.x, | |
| "y": value1.y + value2.y | |
| } | |
| } | |
| function multiply(value1, value2) { | |
| if (value1 instanceof Object) { | |
| return { | |
| "x": value1.x * value2.x, | |
| "y": value1.y * value2.y | |
| } | |
| } | |
| return { | |
| "x": value1 * value2.x, | |
| "y": value1 * value2.y | |
| } | |
| } | |
| function Line() { | |
| } | |
| } |
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