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canvas-text-highlight

v0.0.3

Published

使用canvas绘制句子高亮打分,下划线标注

Downloads

39

Readme

canvas-text-highlight

canvas-text-highlight 是一个针对句子中单词红绿打分, 并对指定单词标注下划线的npm包,效果图如下:

image.png

安装

npm install canvas-text-highlight

使用

首先,需要在 html 中添加 canvas 标签

<canvas id="canvas"></canvas>

然后引入 canvas-text-highlight 并初始化,

import HighlighterText from 'canvas-text-highlight';
h = new HighlighterText('#canvas', {
    width: 300,
    styles: {
      lineHeight: 24,
      lineWidth: 2,
      fontSize: 16,
      font: 'normal bold 16px Gilroy,Arial,sans-serif',
    },
  });

然后计算每个单词的位置并设置默认文本,

h.initText('Hello word!');

根据需求高亮单词或对指定单词显示下划线,这里的位置都表示单词位置

// 高亮
h.highlightText([{ index: 0, status: 1}]);
// 下划线
h.underlineText(0, 1);

status表示颜色高亮状态,可以自行配置颜色

export enum HIGHLIGHT_STATUS {
  NONE = 0, // 灰色
  BAD = 1, // 红色
  NORMAL = 2, // 黑色
  GOOD = 3, // 绿色
}

注意:单词高亮效果是不停累加的,只需传入变动数据即可,下划线数据是一次性的。