修正正确缩放图片BUG；封装标注事件

src/app/system-management/image-label2/image-label2.component.ts

@@ -54,10 +54,14 @@ export class ImageLabel2Component implements OnInit {
       // 等比例缩放图片
       var scale = 1;
       if (img.width > center.clientWidth || img.height > center.clientHeight) {
-        if (img.width > img.height) {
+        let scaleOne = center.clientWidth / img.width;
-          scale = center.clientWidth / img.width;
+        let scaleTwo = center.clientHeight / img.height;
+        if (img.width * scaleOne <= center.clientWidth && img.height * scaleOne <= center.clientHeight) {
+          scale = scaleOne;
+        } else if (img.width * scaleTwo <= center.clientWidth && img.height * scaleTwo <= center.clientHeight) {
+          scale = scaleTwo;
         } else {
-          scale = center.clientHeight / img.height;
+          scale = 0.3;
         }
       }
       that.canvasWidth = img.width * scale;
@@ -109,6 +113,12 @@ export class ImageLabel2Component implements OnInit {
     // let html =  document.documentElement
     // let boxDiv = document.getElementsByClassName("canvasDialog")[0]
     canvas.onmousedown = (e)=>{
+      this.canvasClickEvent(e,canvas,context);
+    }
+  }
+
+  //canvas 点击事件 标注
+  canvasClickEvent(e, canvas, context) {
     var clickX = e.pageX - canvas.offsetLeft;
     var clickY = e.pageY - canvas.offsetTop;
     this.downx = clickX
@@ -187,12 +197,6 @@ export class ImageLabel2Component implements OnInit {
     context.strokeStyle = "#9d4dca";
     context.stroke();
   }
-  }
-
-  //canvas 点击事件 标注
-  canvasClickEvent(e) {
-
-  }
 
   //判断点位是否在图形区域内
   isInt(x, y) {