修复bug:http://192.168.0.21/index.php?m=bug&f=view&bugID=39590

src/view/case/draw/board/editCAD/Renderer/Draw.js

@@ -296,7 +296,15 @@ export default class Draw {
         const defaultWidth = 156;
 
         this.context.font = '12px Microsoft YaHei'
-        const fontWidth = this.context.measureText(geometry.value).width
+        let fontWidth = this.context.measureText(geometry.value).width
+        //如果是数字或者字母
+        const patt = /[A-z0-9]/g;
+        const alphanumeric = geometry.value.match(patt);
+        if(alphanumeric){
+            const alphanumericLen = geometry.value.match(patt).length;
+            fontWidth = fontWidth * (geometry.value.length - alphanumericLen)/geometry.value.length + fontWidth * alphanumericLen/geometry.value.length*1.5
+        }
+        
 
         //let rowCount = Math.ceil(geometry.height/defaultHeight)               //分几行写
         let rowCount = Math.ceil(fontWidth/geometry.width)                        //分几行写，根据要写的文字的长度来判断