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132 lines
3.5 KiB
132 lines
3.5 KiB
8 years ago
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/**
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* canvas绘图
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*
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* Created by GUY on 2015/11/18.
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* @class BI.Canvas
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* @extends BI.Widget
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*/
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BI.Canvas = BI.inherit(BI.Widget, {
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_defaultConfig: function () {
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return BI.extend(BI.Canvas.superclass._defaultConfig.apply(this, arguments), {
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baseCls: "bi-canvas"
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})
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},
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_init: function () {
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BI.Canvas.superclass._init.apply(this, arguments);
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var self = this, o = this.options;
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var canvas = document.createElement("canvas");
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if (!document.createElement('canvas').getContext) {
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canvas = window.G_vmlCanvasManager.initElement(canvas);
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}
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this.element.append(canvas);
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canvas.width = o.width;
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canvas.height = o.height;
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$(canvas).width("100%");
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$(canvas).height("100%");
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this.canvas = canvas;
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this._queue = [];
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},
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_getContext: function () {
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if (!this.ctx) {
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this.ctx = this.canvas.getContext('2d');
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}
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return this.ctx;
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},
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_attr: function (key, value) {
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var self = this;
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if (BI.isNull(key)) {
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return;
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}
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if (BI.isObject(key)) {
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BI.each(key, function (k, v) {
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self._queue.push({k: k, v: v});
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});
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return;
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}
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this._queue.push({k: key, v: value});
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},
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_line: function (x0, y0) {
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var self = this;
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var args = [].slice.call(arguments, 2);
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if (BI.isOdd(args.length)) {
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this._attr(BI.last(args));
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args = BI.initial(args);
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}
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this._attr("moveTo", [x0, y0]);
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var odd = BI.filter(args, function (i) {
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return i % 2 === 0;
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});
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var even = BI.filter(args, function (i) {
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return i % 2 !== 0;
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});
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args = BI.zip(odd, even);
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BI.each(args, function (i, point) {
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self._attr("lineTo", point);
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});
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},
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line: function (x0, y0, x1, y1) {
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this._line.apply(this, arguments);
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this._attr("stroke", []);
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},
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rect: function (x, y, w, h, color) {
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this._attr("fillStyle", color);
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this._attr("fillRect", [x, y, w, h]);
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},
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circle: function (x, y, radius, color) {
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this._attr({
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fillStyle: color,
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beginPath: [],
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arc: [x, y, radius, 0, Math.PI * 2, true],
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closePath: [],
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fill: []
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});
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},
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hollow: function () {
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this._attr("beginPath", []);
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this._line.apply(this, arguments);
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this._attr("closePath", []);
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this._attr("stroke", []);
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},
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solid: function () {
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this.hollow.apply(this, arguments);
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this._attr("fill", []);
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},
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gradient: function (x0, y0, x1, y1, start, end) {
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var grd = this._getContext().createLinearGradient(x0, y0, x1, y1);
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grd.addColorStop(0, start);
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grd.addColorStop(1, end);
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return grd;
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},
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reset: function () {
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this._getContext().clearRect(0, 0, this.canvas.width, this.canvas.height);
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},
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stroke: function (callback) {
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var self = this;
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BI.nextTick(function () {
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var ctx = self._getContext();
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BI.each(self._queue, function (i, q) {
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if (BI.isFunction(ctx[q.k])) {
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ctx[q.k].apply(ctx, q.v);
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} else {
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ctx[q.k] = q.v;
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}
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});
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self._queue = [];
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callback && callback();
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});
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}
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});
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$.shortcut("bi.canvas", BI.Canvas);
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