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106 lines
3.7 KiB
Plaintext
106 lines
3.7 KiB
Plaintext
11 months ago
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"use strict";
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/*
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Copyright [2014] [Diagramo]
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* Small library to smooth the dashed line support in <canvas>
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* Dotted line is made available through:
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*
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* Basic canvas support for dashed lines is based on following CanvasRenderingContext2D's
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* methods and properties:
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* - CanvasRenderingContext2D.setLineDash();
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* - CanvasRenderingContext2D.getLineDash();
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* - CanvasRenderingContext2D.lineDashOffset;
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*
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* @see http://www.rgraph.net/blog/2013/january/html5-canvas-dashed-lines.html
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* */
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var dashSupport = false;
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(function() {
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/*Add setLineDash(...) to Canvas context
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* */
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if (typeof CanvasRenderingContext2D.prototype.setLineDash !== 'function') {
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CanvasRenderingContext2D.prototype.setLineDash = function() {
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if (CanvasRenderingContext2D.prototype.hasOwnProperty("mozDash")) { //Mozilla
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/*If you got an error "NS_ERROR_ILLEGAL_VALUE:" this is because
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* Util.operaReplacer from main.js->save() breaks serialization*/
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this.mozDash = arguments[0];
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}
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else { //others
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console.info("no setLineDash");
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//TODO: implement fall back option. Right now do nothing :)
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/**You are more than welcome to offer a fallback implementation. */
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}
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};
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}
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/*Add getLineDash(...) to Canvas context*/
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if (typeof CanvasRenderingContext2D.prototype.getLineDash !== 'function') {
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CanvasRenderingContext2D.prototype.getLineDash = function() {
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var _dash = null;
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//check if is a Mozilla variant
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if (CanvasRenderingContext2D.prototype.hasOwnProperty("mozDash")) {
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_dash = this.mozDash;
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}
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else {
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console.info("no setLineDash");
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/**You are more than welcome to offer a fallback implementation. */
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}
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return _dash;
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};
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}
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/**Creates lineDashOffset property for context that miss it*/
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if (!CanvasRenderingContext2D.prototype.hasOwnProperty("lineDashOffset")) {
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if (CanvasRenderingContext2D.prototype.hasOwnProperty("mozDashOffset")) { //Mozilla
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Object.defineProperty(CanvasRenderingContext2D.prototype, "lineDashOffset", {
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/**ATTENTION: You must first set mozDash in order to use mozDashOffset*/
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get: function() {
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// console.info("mozDashOffset get");
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return this.mozDashOffset;
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},
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set: function(val) {
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this.mozDashOffset = val;
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// console.info("mozDashOffset set");
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},
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enumerable: true
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});
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}
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else{ //other browsers
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Object.defineProperty(CanvasRenderingContext2D.prototype, "lineDashOffset", {
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get: function() {
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//TODO: add your own implementation
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},
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set: function(val) {
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//TODO: add your own implementation
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},
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enumerable: true
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});
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}
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}
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// console.info("Context enhanced with dotted line");
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dashSupport = true;
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})();
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