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@skit/wxmini-canvas2d

v0.0.3

Published

为微信小程序、小游戏的 Canvas2D 画布提供链式调用语法

Downloads

14

Readme

wxmini-canvas2d

NPM Version NPM Download License


特性

  • 将微信小程序或小游戏中提供的 Canvas 2D API,转化为链式调用形式;
  • 除了完整封装原生 API,还提供了以下几个便捷方法;
    1. rectWithRadius:类似 rect,但支持绘制指定半径的圆角。
    2. fillRectWithRadius:类似 rect + fill,但支持绘制指定半径的圆角。
    3. strokeRectWithRadius:类似 rect + stroke,但支持绘制指定半径的圆角。
    4. drawImageWithRadius:类似 drawImage,但支持绘制指定半径的圆角。
    5. fillTextWithWrap:类似 fillText,但支持指定最大高度的自动换行。
    6. strokeTextWithWrap:类似 strokeText,但支持指定最大高度的自动换行。
  • 可单独拷贝到项目中使用;
  • 支持离屏画布(OffscreenCanvas);
  • 支持 TypeScript。

用法

安装:

npm install @skit/wxmini-promisify

导入:

import { FluentCanvas2D } from '@skit/wxmini-canvas2d';

使用链式方法:

FluentCanvas2D.select({
    selector: '#myCanvasId',
    autoScaleWithDPR: true
}).then((fcanvas) => {
    fcanvas
        .beginPath()
        .arc(20, 20, 2, 0, 2 * Math.PI)
        .setFillStyle('red')
        .fill()
        .closePath();
});

/**
 * @example 以上示例代码等同于下方原生实现:
 */
wx.createSelectorQuery()
    .select('#myCanvasId')
    .fields({
        node: true,
        size: true
    })
    .exec((res) => {
        const canvas = res[0].node;
        const dpr = wx.getSystemInfoSync().pixelRatio;
        canvas.width = res[0].width * dpr;
        canvas.height = res[0].height * dpr;

        const context = canvas.getContext('2d');
        context.beginPath();
        context.arc(20, 20, 2, 0, 2 * Math.PI);
        context.fillStyle = 'red';
        context.fill();
        context.closePath();
    });

更多用法请参考示例项目和 TypeScript 声明文件。


迭代计划

  • [ ] 异步链式方法。

  • [ ] 配置式海报工具。

  • [ ] rpx 单位自动转换。

  • [ ] fillTextWithWrapstrokeTextWithWrap 支持指定单词截断方式。