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524 lines
12 KiB
JavaScript
524 lines
12 KiB
JavaScript
/*!
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jCanvas v2.2.1
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Caleb Evans
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2.2.1 revisions by Thinkyhead
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*/
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(function($, document, Math, Number, undefined) {
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// jC global object
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var jC = {};
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jC.originals = {
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width: 20,
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height: 20,
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cornerRadius: 0,
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fillStyle: 'transparent',
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strokeStyle: 'transparent',
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strokeWidth: 5,
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strokeCap: 'butt',
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strokeJoin: 'miter',
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shadowX: 0,
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shadowY: 0,
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shadowBlur: 10,
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shadowColor: 'transparent',
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x: 0, y: 0,
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x1: 0, y1: 0,
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radius: 10,
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start: 0,
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end: 360,
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ccw: false,
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inDegrees: true,
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fromCenter: true,
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closed: false,
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sides: 3,
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angle: 0,
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text: '',
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font: 'normal 12pt sans-serif',
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align: 'center',
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baseline: 'middle',
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source: '',
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repeat: 'repeat'
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};
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// Duplicate original defaults
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jC.defaults = $.extend({}, jC.originals);
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// Set global properties
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function setGlobals(context, map) {
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context.fillStyle = map.fillStyle;
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context.strokeStyle = map.strokeStyle;
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context.lineWidth = map.strokeWidth;
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context.lineCap = map.strokeCap;
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context.lineJoin = map.strokeJoin;
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context.shadowOffsetX = map.shadowX;
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context.shadowOffsetY = map.shadowY;
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context.shadowBlur = map.shadowBlur;
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context.shadowColor = map.shadowColor;
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}
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// Close path if chosen
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function closePath(context, map) {
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if (map.closed === true) {
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context.closePath();
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context.fill();
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context.stroke();
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} else {
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context.fill();
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context.stroke();
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context.closePath();
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}
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}
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// Measure angles in degrees if chosen
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function checkUnits(map) {
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if (map.inDegrees === true) {
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return Math.PI / 180;
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} else {
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return 1;
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}
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}
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// Set canvas defaults
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$.fn.canvas = function(args) {
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// Reset defaults if no value is passed
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if (typeof args === 'undefined') {
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jC.defaults = jC.originals;
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} else {
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jC.defaults = $.extend({}, jC.defaults, args);
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}
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return this;
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};
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// Load canvas
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$.fn.loadCanvas = function(context) {
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if (typeof context === 'undefined') {context = '2d';}
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return this[0].getContext(context);
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};
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// Create gradient
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$.fn.gradient = function(args) {
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var ctx = this.loadCanvas(),
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// Specify custom defaults
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gDefaults = {
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x1: 0, y1: 0,
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x2: 0, y2: 0,
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r1: 10, r2: 100
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},
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params = $.extend({}, gDefaults, args),
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gradient, stops = 0, percent, i;
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// Create radial gradient if chosen
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if (typeof args.r1 === 'undefined' && typeof args.r2 === 'undefined') {
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gradient = ctx.createLinearGradient(params.x1, params.y1, params.x2, params.y2);
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} else {
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gradient = ctx.createRadialGradient(params.x1, params.y1, params.r1, params.x2, params.y2, params.r2);
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}
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// Count number of color stops
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for (i=1; i<=Number.MAX_VALUE; i+=1) {
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if (params['c' + i]) {
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stops += 1;
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} else {
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break;
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}
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}
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// Calculate color stop percentages if absent
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for (i=1; i<=stops; i+=1) {
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percent = Math.round((100 / (stops-1)) * (i-1)) / 100;
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if (typeof params['s' + i] === 'undefined') {
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params['s' + i] = percent;
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}
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gradient.addColorStop(params['s' + i], params['c' + i]);
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}
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return gradient;
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};
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// Create pattern
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$.fn.pattern = function(args) {
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var ctx = this.loadCanvas(),
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params = $.extend({}, jC.defaults, args),
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pattern,
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img = document.createElement('img');
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img.src = params.source;
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// Create pattern
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function create() {
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if (img.complete === true) {
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// Create pattern
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pattern = ctx.createPattern(img, params.repeat);
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} else {
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throw "The pattern has not loaded yet";
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}
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}
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try {
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create();
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} catch(error) {
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img.onload = create;
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}
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return pattern;
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};
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// Clear canvas
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$.fn.clearCanvas = function(args) {
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var ctx = this.loadCanvas(),
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params = $.extend({}, jC.defaults, args);
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// Draw from center if chosen
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if (params.fromCenter === true) {
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params.x -= params.width / 2;
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params.y -= params.height / 2;
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}
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// Clear entire canvas if chosen
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ctx.beginPath();
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if (typeof args === 'undefined') {
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ctx.clearRect(0, 0, this.width(), this.height());
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} else {
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ctx.clearRect(params.x, params.y, params.width, params.height);
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}
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ctx.closePath();
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return this;
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};
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// Save canvas
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$.fn.saveCanvas = function() {
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var ctx = this.loadCanvas();
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ctx.save();
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return this;
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};
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// Restore canvas
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$.fn.restoreCanvas = function() {
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var ctx = this.loadCanvas();
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ctx.restore();
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return this;
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};
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// Scale canvas
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$.fn.scaleCanvas = function(args) {
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var ctx = this.loadCanvas(),
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params = $.extend({}, jC.defaults, args);
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ctx.save();
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ctx.translate(params.x, params.y);
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ctx.scale(params.width, params.height);
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ctx.translate(-params.x, -params.y)
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return this;
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};
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// Translate canvas
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$.fn.translateCanvas = function(args) {
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var ctx = this.loadCanvas(),
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params = $.extend({}, jC.defaults, args);
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ctx.save();
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ctx.translate(params.x, params.y);
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return this;
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};
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// Rotate canvas
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$.fn.rotateCanvas = function(args) {
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var ctx = this.loadCanvas(),
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params = $.extend({}, jC.defaults, args),
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toRad = checkUnits(params);
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ctx.save();
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ctx.translate(params.x, params.y);
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ctx.rotate(params.angle * toRad);
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ctx.translate(-params.x, -params.y);
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return this;
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};
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// Draw rectangle
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$.fn.drawRect = function(args) {
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var ctx = this.loadCanvas(),
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params = $.extend({}, jC.defaults, args),
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toRad = checkUnits(params),
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x1, y1, x2, y2, r;
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setGlobals(ctx, params);
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// Draw from center if chosen
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if (params.fromCenter === true) {
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params.x -= params.width / 2;
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params.y -= params.height / 2;
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}
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// Draw rounded rectangle if chosen
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if (params.cornerRadius > 0) {
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x1 = params.x;
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y1 = params.y;
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x2 = params.x + params.width;
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y2 = params.y + params.height;
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r = params.cornerRadius;
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if ((x2 - x1) - (2 * r) < 0) {
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r = (x2 - x1) / 2;
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}
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if ((y2 - y1) - (2 * r) < 0) {
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r = (y2 - y1) / 2;
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}
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ctx.beginPath();
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ctx.moveTo(x1+r,y1);
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ctx.lineTo(x2-r,y1);
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ctx.arc(x2-r, y1+r, r, 270*toRad, 360*toRad, false);
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ctx.lineTo(x2,y2-r);
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ctx.arc(x2-r, y2-r, r, 0, 90*toRad, false);
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ctx.lineTo(x1+r,y2);
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ctx.arc(x1+r, y2-r, r, 90*toRad, 180*toRad, false);
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ctx.lineTo(x1,y1+r);
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ctx.arc(x1+r, y1+r, r, 180*toRad, 270*toRad, false);
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ctx.fill();
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ctx.stroke();
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ctx.closePath();
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} else {
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ctx.fillRect(params.x, params.y, params.width, params.height);
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ctx.strokeRect(params.x, params.y, params.width, params.height);
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}
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return this;
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};
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// Draw arc
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$.fn.drawArc = function(args) {
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var ctx = this.loadCanvas(),
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params = $.extend({}, jC.defaults, args),
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toRad = checkUnits(params);
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setGlobals(ctx, params);
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// Draw from center if chosen
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if (params.fromCenter === false) {
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params.x += params.radius;
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params.y += params.radius;
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}
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ctx.beginPath();
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ctx.arc(params.x, params.y, params.radius, (params.start*toRad)-(Math.PI/2), (params.end*toRad)-(Math.PI/2), params.ccw);
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// Close path if chosen
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closePath(ctx, params);
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return this;
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};
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// Draw ellipse
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$.fn.drawEllipse = function(args) {
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var ctx = this.loadCanvas(),
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params = $.extend({}, jC.defaults, args),
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controlW = params.width * (4/3);
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setGlobals(ctx, params);
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// Draw from center if chosen
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if (params.fromCenter === false) {
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params.x += params.width / 2;
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params.y += params.height / 2;
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}
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// Increment coordinates to prevent negative values
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params.x += 1e-10;
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params.y += 1e-10;
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// Create ellipse
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ctx.beginPath();
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ctx.moveTo(params.x, params.y-params.height/2);
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ctx.bezierCurveTo(params.x-controlW/2,params.y-params.height/2,
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params.x-controlW/2,params.y+params.height/2,
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params.x,params.y+params.height/2);
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ctx.bezierCurveTo(params.x+controlW/2,params.y+params.height/2,
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params.x+controlW/2,params.y-params.height/2,
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params.x,params.y-params.height/2);
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ctx.closePath();
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ctx.fill();
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ctx.stroke();
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return this;
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};
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// Draw line
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$.fn.drawLine = function(args) {
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var ctx = this.loadCanvas(),
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params = $.extend({}, jC.defaults, args),
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max = Number.MAX_VALUE, l,
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lx, ly;
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setGlobals(ctx, params);
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// Draw each point
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ctx.beginPath();
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ctx.moveTo(params.x1, params.y1);
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for (l=2; l<max; l+=1) {
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lx = params['x' + l];
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ly = params['y' + l];
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// Stop loop when all points are drawn
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if (typeof lx === 'undefined' || typeof ly === 'undefined') {
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break;
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}
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ctx.lineTo(lx, ly);
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}
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// Close path if chosen
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closePath(ctx, params);
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return this;
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};
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// Draw quadratic curve
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$.fn.drawQuad = function(args) {
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var ctx = this.loadCanvas(),
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params = $.extend({}, jC.defaults, args),
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max = Number.MAX_VALUE, l,
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lx, ly, lcx, lcy;
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setGlobals(ctx, params);
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// Draw each point
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ctx.beginPath();
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ctx.moveTo(params.x1, params.y1);
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for (l=2; l<max; l+=1) {
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lx = params['x' + l];
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if (typeof lx === 'undefined') break;
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ly = params['y' + l];
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if (typeof ly === 'undefined') break;
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lcx = params['cx' + (l-1)];
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if (typeof lcx === 'undefined') break;
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lcy = params['cy' + (l-1)];
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if (typeof lcy === 'undefined') break;
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ctx.quadraticCurveTo(lcx, lcy, lx, ly);
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}
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// Close path if chosen
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closePath(ctx, params);
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return this;
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};
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// Draw Bezier curve
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$.fn.drawBezier = function(args) {
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var ctx = this.loadCanvas(),
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params = $.extend({}, jC.defaults, args),
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max = Number.MAX_VALUE,
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l=2, lc=1, lx, ly, lcx1, lcy1, lcx2, lcy2, i;
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setGlobals(ctx, params);
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// Draw each point
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ctx.beginPath();
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ctx.moveTo(params.x1, params.y1);
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for (i=2; i<max; i+=1) {
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lx = params['x' + l];
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if (typeof lx === 'undefined') break;
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ly = params['y' + l];
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if (typeof ly === 'undefined') break;
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lcx1 = params['cx' + lc];
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if (typeof lcx1 === 'undefined') break;
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lcy1 = params['cy' + lc];
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if (typeof lcy1 === 'undefined') break;
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lcx2 = params['cx' + (lc+1)];
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if (typeof lcx2 === 'undefined') break;
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lcy2 = params['cy' + (lc+1)];
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if (typeof lcy2 === 'undefined') break;
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ctx.bezierCurveTo(lcx1, lcy1, lcx2, lcy2, lx, ly);
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l += 1;
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lc += 2;
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}
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// Close path if chosen
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closePath(ctx, params);
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return this;
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};
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// Draw text
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$.fn.drawText = function(args) {
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var ctx = this.loadCanvas(),
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params = $.extend({}, jC.defaults, args);
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setGlobals(ctx, params);
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// Set text-specific properties
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ctx.textBaseline = params.baseline;
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ctx.textAlign = params.align;
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ctx.font = params.font;
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ctx.strokeText(params.text, params.x, params.y);
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ctx.fillText(params.text, params.x, params.y);
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return this;
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};
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// Draw image
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$.fn.drawImage = function(args) {
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var ctx = this.loadCanvas(),
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params = $.extend({}, jC.defaults, args),
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// Define image source
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img = document.createElement('img');
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img.src = params.source;
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setGlobals(ctx, params);
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// Draw image function
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function draw() {
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if (img.complete) {
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var scaleFac = img.width / img.height;
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// If width/height are specified
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if (typeof args.width !== 'undefined' && typeof args.height !== 'undefined') {
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img.width = args.width;
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img.height = args.height;
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// If width is specified
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} else if (typeof args.width !== 'undefined' && typeof args.height === 'undefined') {
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img.width = args.width;
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img.height = img.width / scaleFac;
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// If height is specified
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} else if (typeof args.width === 'undefined' && typeof args.height !== 'undefined') {
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img.height = args.height;
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img.width = img.height * scaleFac;
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}
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// Draw from center if chosen
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if (params.fromCenter === true) {
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params.x -= img.width / 2;
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params.y -= img.height / 2;
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}
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// Draw image
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ctx.drawImage(img, params.x, params.y, img.width, img.height);
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} else {
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throw "The image has not loaded yet.";
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}
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}
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function dodraw() {
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// console.log("dodraw...");
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try {
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// console.log("dodraw...try...");
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draw();
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}
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catch(error) {
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// console.log("dodraw...catch: " + error);
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}
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}
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// Draw image if already loaded
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// console.log("--------------------");
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// console.log("drawImage " + img.src);
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try {
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// console.log("try...");
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draw();
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} catch(error) {
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// console.log("catch: " + error);
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img.onload = dodraw;
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}
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return this;
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};
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// Draw polygon
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$.fn.drawPolygon = function(args) {
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var ctx = this.loadCanvas(),
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params = $.extend({}, jC.defaults, args),
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theta, dtheta, x, y,
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toRad = checkUnits(params), i;
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setGlobals(ctx, params);
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if (params.sides >= 3) {
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// Calculate points and draw
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theta = (Math.PI/2) + (Math.PI/params.sides) + (params.angle*toRad);
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dtheta = (Math.PI*2) / params.sides;
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for (i=0; i<params.sides; i+=1) {
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x = params.x + (params.radius * Math.cos(theta)) + 1e-10;
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y = params.y + (params.radius * Math.sin(theta)) + 1e-10;
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if (params.fromCenter === false) {
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x += params.radius;
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y += params.radius;
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}
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ctx.lineTo(x, y);
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theta += dtheta;
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}
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closePath(ctx, params);
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}
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return this;
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};
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return window.jCanvas = jC;
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}(jQuery, document, Math, Number)); |