feat(features/modeling): assign default size for elements

lib/features/modeling/ElementFactory.js

@@ -23,7 +23,8 @@ ElementFactory.prototype.createWithBpmn = function(elementType, attrs) {
 
   attrs = attrs || {};
 
-  var businessObject = attrs.businessObject;
+  var businessObject = attrs.businessObject,
+      size;
 
   if (!businessObject) {
     if (!attrs.type) {
@@ -31,12 +32,14 @@ ElementFactory.prototype.createWithBpmn = function(elementType, attrs) {
     }
 
     businessObject = this._bpmnFactory.create(attrs.type);
+  }
 
-    _.extend(attrs, {
+  size = this._getDefaultSize(businessObject);
+
+  attrs = _.extend({
     businessObject: businessObject,
     id: businessObject.id
-    });
+  }, size, attrs);
-  }
 
   return this.create(elementType, attrs);
 };
@@ -56,3 +59,18 @@ ElementFactory.prototype.createShape = function(attrs) {
 ElementFactory.prototype.createConnection = function(attrs) {
   return this.createWithBpmn('connection', attrs);
 };
+
+ElementFactory.prototype._getDefaultSize = function(semantic) {
+
+  if (semantic.$instanceOf('bpmn:Task')) {
+    return { width: 100, height: 80 };
+  }
+
+  if (semantic.$instanceOf('bpmn:Gateway')) {
+    return { width: 36, height: 36 };
+  }
+
+  if (semantic.$instanceOf('bpmn:Event')) {
+    return { width: 36, height: 36 };
+  }
+};