WeZRender是一个微信小程序Canvas增强组件,基于HTML5 Canvas类库ZRender。
使用
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); |
|
特性
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。
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| 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。
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| 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();
| }
| }); |
|
开源协议
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。
项目地址