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META-INF.assets.rjzjh.zrender.Layer.js Maven / Gradle / Ivy
/**
* @module zrender/Layer
* @author pissang(https://www.github.com/pissang)
*/
define(function (require) {
var util = require('./core/util');
var config = require('./config');
function returnFalse() {
return false;
}
/**
* 创建dom
*
* @inner
* @param {string} id dom id 待用
* @param {string} type dom type,such as canvas, div etc.
* @param {Painter} painter painter instance
* @param {number} number
*/
function createDom(id, type, painter, dpr) {
var newDom = document.createElement(type);
var width = painter.getWidth();
var height = painter.getHeight();
var newDomStyle = newDom.style;
// 没append呢,请原谅我这样写,清晰~
newDomStyle.position = 'absolute';
newDomStyle.left = 0;
newDomStyle.top = 0;
newDomStyle.width = width + 'px';
newDomStyle.height = height + 'px';
newDom.width = width * dpr;
newDom.height = height * dpr;
// id不作为索引用,避免可能造成的重名,定义为私有属性
newDom.setAttribute('data-zr-dom-id', id);
return newDom;
}
/**
* @alias module:zrender/Layer
* @constructor
* @extends module:zrender/mixin/Transformable
* @param {string} id
* @param {module:zrender/Painter} painter
* @param {number} [dpr]
*/
var Layer = function(id, painter, dpr) {
var dom;
dpr = dpr || config.devicePixelRatio;
if (typeof id === 'string') {
dom = createDom(id, 'canvas', painter, dpr);
}
// Not using isDom because in node it will return false
else if (util.isObject(id)) {
dom = id;
id = dom.id;
}
this.id = id;
this.dom = dom;
var domStyle = dom.style;
if (domStyle) { // Not in node
dom.onselectstart = returnFalse; // 避免页面选中的尴尬
domStyle['-webkit-user-select'] = 'none';
domStyle['user-select'] = 'none';
domStyle['-webkit-touch-callout'] = 'none';
domStyle['-webkit-tap-highlight-color'] = 'rgba(0,0,0,0)';
}
this.domBack = null;
this.ctxBack = null;
this.painter = painter;
this.config = null;
// Configs
/**
* 每次清空画布的颜色
* @type {string}
* @default 0
*/
this.clearColor = 0;
/**
* 是否开启动态模糊
* @type {boolean}
* @default false
*/
this.motionBlur = false;
/**
* 在开启动态模糊的时候使用,与上一帧混合的alpha值,值越大尾迹越明显
* @type {number}
* @default 0.7
*/
this.lastFrameAlpha = 0.7;
/**
* Layer dpr
* @type {number}
*/
this.dpr = dpr;
};
Layer.prototype = {
constructor: Layer,
elCount: 0,
__dirty: true,
initContext: function () {
this.ctx = this.dom.getContext('2d');
var dpr = this.dpr;
if (dpr != 1) {
this.ctx.scale(dpr, dpr);
}
},
createBackBuffer: function () {
var dpr = this.dpr;
this.domBack = createDom('back-' + this.id, 'canvas', this.painter, dpr);
this.ctxBack = this.domBack.getContext('2d');
if (dpr != 1) {
this.ctxBack.scale(dpr, dpr);
}
},
/**
* @param {number} width
* @param {number} height
*/
resize: function (width, height) {
var dpr = this.dpr;
var dom = this.dom;
var domStyle = dom.style;
var domBack = this.domBack;
domStyle.width = width + 'px';
domStyle.height = height + 'px';
dom.width = width * dpr;
dom.height = height * dpr;
if (dpr != 1) {
this.ctx.scale(dpr, dpr);
}
if (domBack) {
domBack.width = width * dpr;
domBack.height = height * dpr;
if (dpr != 1) {
this.ctxBack.scale(dpr, dpr);
}
}
},
/**
* 清空该层画布
* @param {boolean} clearAll Clear all with out motion blur
*/
clear: function (clearAll) {
var dom = this.dom;
var ctx = this.ctx;
var width = dom.width;
var height = dom.height;
var haveClearColor = this.clearColor;
var haveMotionBLur = this.motionBlur && !clearAll;
var lastFrameAlpha = this.lastFrameAlpha;
var dpr = this.dpr;
if (haveMotionBLur) {
if (!this.domBack) {
this.createBackBuffer();
}
this.ctxBack.globalCompositeOperation = 'copy';
this.ctxBack.drawImage(
dom, 0, 0,
width / dpr,
height / dpr
);
}
ctx.clearRect(0, 0, width / dpr, height / dpr);
if (haveClearColor) {
ctx.save();
ctx.fillStyle = this.clearColor;
ctx.fillRect(0, 0, width / dpr, height / dpr);
ctx.restore();
}
if (haveMotionBLur) {
var domBack = this.domBack;
ctx.save();
ctx.globalAlpha = lastFrameAlpha;
ctx.drawImage(domBack, 0, 0, width / dpr, height / dpr);
ctx.restore();
}
}
};
return Layer;
});