Fix the last commit.

src/chart/graph/GraphSeries.js

@@ -190,7 +190,7 @@ define(function (require) {
             force: {
                 initLayout: null,
                 // Node repulsion. Can be an array to represent range.
-                repulsion: [1, 50],
+                repulsion: [0, 50],
                 gravity: 0.1,
 
                 // Edge length. Can be an array to represent range.

src/chart/graph/forceHelper.js

@@ -83,6 +83,11 @@ define(function (require) {
                     vec2.sub(v12, n2.p, n1.p);
                     var d = vec2.len(v12) - e.d;
                     var w = n2.w / (n1.w + n2.w);
+
+                    if (isNaN(w)) {
+                        w = 0;
+                    }
+
                     vec2.normalize(v12, v12);
 
                     !n1.fixed && scaleAndAdd(n1.p, n1.p, v12, w * d * friction);

src/chart/graph/forceLayout.js

@@ -50,13 +50,8 @@ define(function (require) {
                 var nodes = nodeData.mapArray('value', function (value, idx) {
                     var point = nodeData.getItemLayout(idx);
                     var rep = numberUtil.linearMap(value, nodeDataExtent, repulsion);
-                    var halfRep = (repulsion[0] + repulsion[1]) / 2;
                     if (isNaN(rep)) {
-                        rep = halfRep;
-                    }
-                    // rep can not be 0.
-                    if (rep <= 0) {
-                        rep = Math.max(1e-4, Math.min(1, halfRep));
+                        rep = (repulsion[0] + repulsion[1]) / 2;
                     }
                     return {
                         w: rep,