improve code

plugins/behaviour.analysis/index.js

@@ -128,6 +128,5 @@ G6.registerBehaviour('wheelZoom', graph => {
     timeout = setTimeout(() => {
       timeout = undefined;
     }, 50);
-    graph.emit('afterzoom');
   }
 });

src/mixin/fit-view.js

@@ -106,12 +106,16 @@ Mixin.AUGMENT = {
    * @return {Graph} this
    */
   updateMatrix(matrix) {
+    const originMatrix = this.getMatrix();
     const ev = {
       updateMatrix: matrix,
-      originMatrix: this.getMatrix()
+      originMatrix
     };
+    const zoomBool = originMatrix[0] !== matrix[0];
     this.emit('beforeviewportchange', ev);
+    zoomBool && this.emit('beforezoom', ev);
     this.setMatrix(matrix);
+    zoomBool && this.emit('afterzoom', ev);
     this.emit('afterviewportchange', ev);
     this.draw();
     return this;

src/shape/nodes/common.js

@@ -66,10 +66,6 @@ Shape.registerNode('common', {
     }
     return group.addShape('text', {
       class: 'label',
-      freezePoint: {
-        x: 0,
-        y: 0
-      },
       attrs
     });
   },