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107 lines
1.7 KiB
107 lines
1.7 KiB
/*
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copyright (c) 2018 jones
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http://www.apache.org/licenses/LICENSE-2.0
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开源项目 https://github.com/jones2000/HQChart
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jones_2000@163.com
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uniapp canvas 兼容方法
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*/
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function JSUniAppCanvasHelper() { }
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JSUniAppCanvasHelper.GetCanvasFont=function(canvas)
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{
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return canvas.font;
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}
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JSUniAppCanvasHelper.MeasureText=function(text, canvas)
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{
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var font= JSUniAppCanvasHelper.GetCanvasFont(canvas);
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var fontSize = 12;
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var pos=font.search('px');
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if (pos>0)
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{
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var strSize = font.substring(0,pos);
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fontSize = parseInt(strSize);
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}
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text = String(text);
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var text = text.split('');
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var width = 0;
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for (let i = 0; i < text.length; i++)
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{
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let item = text[i];
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if (/[a-zA-Z]/.test(item))
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{
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width += 7;
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}
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else if (/[0-9]/.test(item))
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{
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width += 5.5;
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}
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else if (/\./.test(item))
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{
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width += 2.7;
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}
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else if (/,/.test(item))
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{
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width += 2.7;
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}
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else if (/-/.test(item))
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{
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width += 3.25;
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}
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else if (/_/.test(item))
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{
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width += 4.5;
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}
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else if (/[\u4e00-\u9fa5]/.test(item))
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{
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width += 10;
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}
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else if (/\(|\)/.test(item))
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{
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width += 3.73;
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}
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else if (/\s/.test(item)) //空格
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{
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width += 3.25;
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}
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else if (/%/.test(item))
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{
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width += 8;
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}
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else if (/:/.test(item))
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{
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width += 3.25;
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}
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else
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{
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width += 10;
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}
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}
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return width * fontSize / 10;
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}
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//导出统一使用JSCommon命名空间名
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var JSCommonUniApp=
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{
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JSUniAppCanvasHelper: JSUniAppCanvasHelper,
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};
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export
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{
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JSCommonUniApp
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}
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/*
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module.exports =
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{
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JSCommonUniApp:
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{
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JSUniAppCanvasHelper: JSUniAppCanvasHelper,
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}
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};
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*/
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