RRDJ_APP/uniapp/uni_modules/jones-hqchart2/js_sdk/umychart.uniapp.canvas.helper.js

/*
copyright (c) 2018 jones

    http://www.apache.org/licenses/LICENSE-2.0

    开源项目 https://github.com/jones2000/HQChart

    jones_2000@163.com
    
    uniapp canvas 兼容方法
*/

function JSUniAppCanvasHelper() { }

JSUniAppCanvasHelper.MeasureText=function(text, canvas) 
{
    var font = canvas.font;
	var fontSize = 12;
    var pos=font.search('px');
    if (pos>0) 
    {
        var strSize = font.substring(0,pos);
        fontSize = parseInt(strSize);
    }
	text = String(text);
	var text = text.split('');
	var width = 0;
	for (let i = 0; i < text.length; i++) 
	{
		let item = text[i];
		if (/[a-zA-Z]/.test(item)) 
		{
			width += 7;
		} else if (/[0-9]/.test(item)) 
		{
			width += 5.5;
		} else if (/\./.test(item)) 
		{
			width += 2.7;
		} else if (/-/.test(item)) 
		{
			width += 3.25;
		} else if (/[\u4e00-\u9fa5]/.test(item)) 
		{
			width += 10;
		} else if (/\(|\)/.test(item)) 
		{
			width += 3.73;
		} else if (/\s/.test(item)) 
		{
			width += 2.5;
		} else if (/%/.test(item)) 
		{
			width += 8;
		} else 
		{
			width += 10;
		}
	}
	return width * fontSize / 10;
}

//导出统一使用JSCommon命名空间名
module.exports =
{
    JSCommonUniApp:
    {
        JSUniAppCanvasHelper: JSUniAppCanvasHelper,
    }
};