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+/*!
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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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+
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+(function($, document, Math, Number, undefined) {
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+
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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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+
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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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+
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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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+
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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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+
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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 = $.extend({}, jC.defaults, args);
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+ }
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+ return this;
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+};
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+
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+// Load canvas
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+$.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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+
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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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+
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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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+
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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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+
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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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+
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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 = $.extend({}, jC.defaults, args),
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+ pattern,
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+ img = document.createElement('img');
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+ img.src = params.source;
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+
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+ // Create pattern
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+ function create() {
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+ if (img.complete === true) {
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+ // Create pattern
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+ pattern = ctx.createPattern(img, params.repeat);
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+ } else {
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+ throw "The pattern has not loaded yet";
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+ }
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+ }
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+ try {
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+ create();
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+ } catch(error) {
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+ img.onload = create;
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+ }
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+ return pattern;
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+};
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+
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+// Clear canvas
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+$.fn.clearCanvas = function(args) {
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+ var ctx = this.loadCanvas(),
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+ params = $.extend({}, jC.defaults, args);
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+
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+ // Draw from center if chosen
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+ if (params.fromCenter === true) {
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+ params.x -= params.width / 2;
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+ params.y -= params.height / 2;
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+ }
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+
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+ // Clear entire canvas if chosen
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+ ctx.beginPath();
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+ if (typeof args === 'undefined') {
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+ ctx.clearRect(0, 0, this.width(), this.height());
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+ } else {
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+ ctx.clearRect(params.x, params.y, params.width, params.height);
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+ }
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+ ctx.closePath();
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+ return this;
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+};
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+
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+// Save canvas
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+$.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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+
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+// Restore canvas
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+$.fn.restoreCanvas = function() {
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+ var ctx = this.loadCanvas();
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+ ctx.restore();
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+ return this;
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+};
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+
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+// Scale canvas
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+$.fn.scaleCanvas = function(args) {
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+ var ctx = this.loadCanvas(),
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+ params = $.extend({}, jC.defaults, args);
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+ ctx.save();
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+ ctx.translate(params.x, params.y);
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+ ctx.scale(params.width, params.height);
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+ ctx.translate(-params.x, -params.y)
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+ return this;
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+};
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+
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+// Translate canvas
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+$.fn.translateCanvas = function(args) {
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+ var ctx = this.loadCanvas(),
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+ params = $.extend({}, jC.defaults, args);
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+ ctx.save();
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+ ctx.translate(params.x, params.y);
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+ return this;
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+};
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+
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+// Rotate canvas
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+$.fn.rotateCanvas = function(args) {
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+ var ctx = this.loadCanvas(),
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+ params = $.extend({}, jC.defaults, args),
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+ toRad = checkUnits(params);
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+
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+ ctx.save();
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+ ctx.translate(params.x, params.y);
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+ ctx.rotate(params.angle * toRad);
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+ ctx.translate(-params.x, -params.y);
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+ return this;
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+};
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+
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+// Draw rectangle
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+$.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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+
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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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+
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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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+
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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 = $.extend({}, jC.defaults, args),
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+ toRad = checkUnits(params);
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+ setGlobals(ctx, params);
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+
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+ // Draw from center if chosen
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+ if (params.fromCenter === false) {
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+ params.x += params.radius;
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+ params.y += params.radius;
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+ }
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+
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+ ctx.beginPath();
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+ ctx.arc(params.x, params.y, params.radius, (params.start*toRad)-(Math.PI/2), (params.end*toRad)-(Math.PI/2), params.ccw);
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+ // Close path if chosen
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+ closePath(ctx, params);
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+ return this;
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+};
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+
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+// Draw ellipse
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+$.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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+
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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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+
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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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+
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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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|
326
|
+ return this;
|
|
|
327
|
+};
|
|
|
328
|
+
|
|
|
329
|
+// Draw line
|
|
|
330
|
+$.fn.drawLine = function(args) {
|
|
|
331
|
+ var ctx = this.loadCanvas(),
|
|
|
332
|
+ params = $.extend({}, jC.defaults, args),
|
|
|
333
|
+ max = Number.MAX_VALUE, l,
|
|
|
334
|
+ lx, ly;
|
|
|
335
|
+ setGlobals(ctx, params);
|
|
|
336
|
+
|
|
|
337
|
+ // Draw each point
|
|
|
338
|
+ ctx.beginPath();
|
|
|
339
|
+ ctx.moveTo(params.x1, params.y1);
|
|
|
340
|
+ for (l=2; l<max; l+=1) {
|
|
|
341
|
+ lx = params['x' + l];
|
|
|
342
|
+ ly = params['y' + l];
|
|
|
343
|
+ // Stop loop when all points are drawn
|
|
|
344
|
+ if (typeof lx === 'undefined' || typeof ly === 'undefined') {
|
|
|
345
|
+ break;
|
|
|
346
|
+ }
|
|
|
347
|
+ ctx.lineTo(lx, ly);
|
|
|
348
|
+ }
|
|
|
349
|
+ // Close path if chosen
|
|
|
350
|
+ closePath(ctx, params);
|
|
|
351
|
+ return this;
|
|
|
352
|
+};
|
|
|
353
|
+
|
|
|
354
|
+// Draw quadratic curve
|
|
|
355
|
+$.fn.drawQuad = function(args) {
|
|
|
356
|
+ var ctx = this.loadCanvas(),
|
|
|
357
|
+ params = $.extend({}, jC.defaults, args),
|
|
|
358
|
+ max = Number.MAX_VALUE, l,
|
|
|
359
|
+ lx, ly, lcx, lcy;
|
|
|
360
|
+ setGlobals(ctx, params);
|
|
|
361
|
+
|
|
|
362
|
+ // Draw each point
|
|
|
363
|
+ ctx.beginPath();
|
|
|
364
|
+ ctx.moveTo(params.x1, params.y1);
|
|
|
365
|
+ for (l=2; l<max; l+=1) {
|
|
|
366
|
+ lx = params['x' + l];
|
|
|
367
|
+ if (typeof lx === 'undefined') break;
|
|
|
368
|
+ ly = params['y' + l];
|
|
|
369
|
+ if (typeof ly === 'undefined') break;
|
|
|
370
|
+ lcx = params['cx' + (l-1)];
|
|
|
371
|
+ if (typeof lcx === 'undefined') break;
|
|
|
372
|
+ lcy = params['cy' + (l-1)];
|
|
|
373
|
+ if (typeof lcy === 'undefined') break;
|
|
|
374
|
+ ctx.quadraticCurveTo(lcx, lcy, lx, ly);
|
|
|
375
|
+ }
|
|
|
376
|
+ // Close path if chosen
|
|
|
377
|
+ closePath(ctx, params);
|
|
|
378
|
+ return this;
|
|
|
379
|
+};
|
|
|
380
|
+
|
|
|
381
|
+// Draw Bezier curve
|
|
|
382
|
+$.fn.drawBezier = function(args) {
|
|
|
383
|
+ var ctx = this.loadCanvas(),
|
|
|
384
|
+ params = $.extend({}, jC.defaults, args),
|
|
|
385
|
+ max = Number.MAX_VALUE,
|
|
|
386
|
+ l=2, lc=1, lx, ly, lcx1, lcy1, lcx2, lcy2, i;
|
|
|
387
|
+ setGlobals(ctx, params);
|
|
|
388
|
+
|
|
|
389
|
+ // Draw each point
|
|
|
390
|
+ ctx.beginPath();
|
|
|
391
|
+ ctx.moveTo(params.x1, params.y1);
|
|
|
392
|
+ for (i=2; i<max; i+=1) {
|
|
|
393
|
+ lx = params['x' + l];
|
|
|
394
|
+ if (typeof lx === 'undefined') break;
|
|
|
395
|
+ ly = params['y' + l];
|
|
|
396
|
+ if (typeof ly === 'undefined') break;
|
|
|
397
|
+ lcx1 = params['cx' + lc];
|
|
|
398
|
+ if (typeof lcx1 === 'undefined') break;
|
|
|
399
|
+ lcy1 = params['cy' + lc];
|
|
|
400
|
+ if (typeof lcy1 === 'undefined') break;
|
|
|
401
|
+ lcx2 = params['cx' + (lc+1)];
|
|
|
402
|
+ if (typeof lcx2 === 'undefined') break;
|
|
|
403
|
+ lcy2 = params['cy' + (lc+1)];
|
|
|
404
|
+ if (typeof lcy2 === 'undefined') break;
|
|
|
405
|
+ ctx.bezierCurveTo(lcx1, lcy1, lcx2, lcy2, lx, ly);
|
|
|
406
|
+ l += 1;
|
|
|
407
|
+ lc += 2;
|
|
|
408
|
+ }
|
|
|
409
|
+ // Close path if chosen
|
|
|
410
|
+ closePath(ctx, params);
|
|
|
411
|
+ return this;
|
|
|
412
|
+};
|
|
|
413
|
+
|
|
|
414
|
+// Draw text
|
|
|
415
|
+$.fn.drawText = function(args) {
|
|
|
416
|
+ var ctx = this.loadCanvas(),
|
|
|
417
|
+ params = $.extend({}, jC.defaults, args);
|
|
|
418
|
+ setGlobals(ctx, params);
|
|
|
419
|
+
|
|
|
420
|
+ // Set text-specific properties
|
|
|
421
|
+ ctx.textBaseline = params.baseline;
|
|
|
422
|
+ ctx.textAlign = params.align;
|
|
|
423
|
+ ctx.font = params.font;
|
|
|
424
|
+
|
|
|
425
|
+ ctx.strokeText(params.text, params.x, params.y);
|
|
|
426
|
+ ctx.fillText(params.text, params.x, params.y);
|
|
|
427
|
+ return this;
|
|
|
428
|
+};
|
|
|
429
|
+
|
|
|
430
|
+// Draw image
|
|
|
431
|
+$.fn.drawImage = function(args) {
|
|
|
432
|
+ var ctx = this.loadCanvas(),
|
|
|
433
|
+ params = $.extend({}, jC.defaults, args),
|
|
|
434
|
+ // Define image source
|
|
|
435
|
+ img = document.createElement('img');
|
|
|
436
|
+ img.src = params.source;
|
|
|
437
|
+ setGlobals(ctx, params);
|
|
|
438
|
+
|
|
|
439
|
+ // Draw image function
|
|
|
440
|
+ function draw() {
|
|
|
441
|
+ if (img.complete) {
|
|
|
442
|
+
|
|
|
443
|
+ var scaleFac = img.width / img.height;
|
|
|
444
|
+
|
|
|
445
|
+ // If width/height are specified
|
|
|
446
|
+ if (typeof args.width !== 'undefined' && typeof args.height !== 'undefined') {
|
|
|
447
|
+ img.width = args.width;
|
|
|
448
|
+ img.height = args.height;
|
|
|
449
|
+ // If width is specified
|
|
|
450
|
+ } else if (typeof args.width !== 'undefined' && typeof args.height === 'undefined') {
|
|
|
451
|
+ img.width = args.width;
|
|
|
452
|
+ img.height = img.width / scaleFac;
|
|
|
453
|
+ // If height is specified
|
|
|
454
|
+ } else if (typeof args.width === 'undefined' && typeof args.height !== 'undefined') {
|
|
|
455
|
+ img.height = args.height;
|
|
|
456
|
+ img.width = img.height * scaleFac;
|
|
|
457
|
+ }
|
|
|
458
|
+
|
|
|
459
|
+ // Draw from center if chosen
|
|
|
460
|
+ if (params.fromCenter === true) {
|
|
|
461
|
+ params.x -= img.width / 2;
|
|
|
462
|
+ params.y -= img.height / 2;
|
|
|
463
|
+ }
|
|
|
464
|
+
|
|
|
465
|
+ // Draw image
|
|
|
466
|
+ ctx.drawImage(img, params.x, params.y, img.width, img.height);
|
|
|
467
|
+ } else {
|
|
|
468
|
+ throw "The image has not loaded yet.";
|
|
|
469
|
+ }
|
|
|
470
|
+ }
|
|
|
471
|
+
|
|
|
472
|
+ function dodraw() {
|
|
|
473
|
+ // console.log("dodraw...");
|
|
|
474
|
+ try {
|
|
|
475
|
+ // console.log("dodraw...try...");
|
|
|
476
|
+ draw();
|
|
|
477
|
+ }
|
|
|
478
|
+ catch(error) {
|
|
|
479
|
+ // console.log("dodraw...catch: " + error);
|
|
|
480
|
+ }
|
|
|
481
|
+ }
|
|
|
482
|
+
|
|
|
483
|
+ // Draw image if already loaded
|
|
|
484
|
+ // console.log("--------------------");
|
|
|
485
|
+ // console.log("drawImage " + img.src);
|
|
|
486
|
+ try {
|
|
|
487
|
+ // console.log("try...");
|
|
|
488
|
+ draw();
|
|
|
489
|
+ } catch(error) {
|
|
|
490
|
+ // console.log("catch: " + error);
|
|
|
491
|
+ img.onload = dodraw;
|
|
|
492
|
+ }
|
|
|
493
|
+ return this;
|
|
|
494
|
+};
|
|
|
495
|
+
|
|
|
496
|
+// Draw polygon
|
|
|
497
|
+$.fn.drawPolygon = function(args) {
|
|
|
498
|
+ var ctx = this.loadCanvas(),
|
|
|
499
|
+ params = $.extend({}, jC.defaults, args),
|
|
|
500
|
+ theta, dtheta, x, y,
|
|
|
501
|
+ toRad = checkUnits(params), i;
|
|
|
502
|
+ setGlobals(ctx, params);
|
|
|
503
|
+
|
|
|
504
|
+ if (params.sides >= 3) {
|
|
|
505
|
+ // Calculate points and draw
|
|
|
506
|
+ theta = (Math.PI/2) + (Math.PI/params.sides) + (params.angle*toRad);
|
|
|
507
|
+ dtheta = (Math.PI*2) / params.sides;
|
|
|
508
|
+ for (i=0; i<params.sides; i+=1) {
|
|
|
509
|
+ x = params.x + (params.radius * Math.cos(theta)) + 1e-10;
|
|
|
510
|
+ y = params.y + (params.radius * Math.sin(theta)) + 1e-10;
|
|
|
511
|
+ if (params.fromCenter === false) {
|
|
|
512
|
+ x += params.radius;
|
|
|
513
|
+ y += params.radius;
|
|
|
514
|
+ }
|
|
|
515
|
+ ctx.lineTo(x, y);
|
|
|
516
|
+ theta += dtheta;
|
|
|
517
|
+ }
|
|
|
518
|
+ closePath(ctx, params);
|
|
|
519
|
+ }
|
|
|
520
|
+ return this;
|
|
|
521
|
+};
|
|
|
522
|
+
|
|
|
523
|
+return window.jCanvas = jC;
|
|
|
524
|
+}(jQuery, document, Math, Number));
|
Scott Lahteine
10 years ago