WeZRender是一个微信小程序Canvas增强组件，基于HTML5 Canvas类库ZRender。
WXML：
<canvas style="width: 375px; height: 600px;" canvas-id="line-canvas-1"></canvas>JS：
var wezrender = require('../../lib/wezrender');
zr = wezrender.zrender.init("line-canvas-1", 375, 600);数据驱动
利用WeZRender绘图，只需定义图形数据。
var circle = new wezrender.graphic.shape.Circle(
shape: {
cx: 50,
cy: 50,
r: 50
},
style: {
fill: 'red',
lineWidth: 10
}
});丰富的图形选项
内置多种图形元素（圆形、椭圆、圆环、扇形、矩形、多边形、直线、曲线、心形、水滴、玫瑰线、Trochoid、文字、图片等），统一且丰富的图形属性充分满足个性化需求。
var droplet = new wezrender.graphic.shape.Droplet({
shape: {
cx: 200,
cy: 300,
width: 50,
height: 50
},
style: {
fill: '#ff9999'
}
});强大的动画支持
提供promise式的动画接口和常用缓动函数，轻松实现各种动画需求。
var image = new wezrender.graphic.Image({
style: {
x: 0,
y: 0,
image: '../../images/koala.jpg',
width: 32,
height: 24,
text: 'koala'
}
});
zr.add(image);
image.animateStyle(true)
.when(2000, {
x: 350,
y: 450,
width: 360,
height: 270,
})
.start();易于扩展
分而治之的图形定义策略允许扩展图形元素。
var Pin = wezrender.graphic.Path.extend({
type: 'pin',
shape: {
// x, y on the cusp
x: 0,
y: 0,
width: 0,
height: 0
},
buildPath: function (path, shape) {
var x = shape.x;
var y = shape.y;
var w = shape.width / 5 * 3;
// Height must be larger than width
var h = Math.max(w, shape.height);
var r = w / 2;
// Dist on y with tangent point and circle center
var dy = r * r / (h - r);
var cy = y - h + r + dy;
var angle = Math.asin(dy / r);
// Dist on x with tangent point and circle center
var dx = Math.cos(angle) * r;
var tanX = Math.sin(angle);
var tanY = Math.cos(angle);
path.arc(
x, cy, r,
Math.PI - angle,
Math.PI * 2 + angle
);
var cpLen = r * 0.6;
var cpLen2 = r * 0.7;
path.bezierCurveTo(
x + dx - tanX * cpLen, cy + dy + tanY * cpLen,
x, y - cpLen2,
x, y
);
path.bezierCurveTo(
x, y - cpLen2,
x - dx + tanX * cpLen, cy + dy + tanY * cpLen,
x - dx, cy + dy
);
path.closePath();
}
});本项目依据MIT开源协议发布，允许任何组织和个人免费使用。
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