feat(ZoomScroll): add #reset to revert view to default

Closes #33

lib/feature/zoomscroll/index.js

@@ -2,6 +2,7 @@ var mousewheel = require('./mousewheel');
 
 var bpmnModule = require('../../di').defaultModule;
 
+
 function ZoomScroll(events, canvas) {
 
   var RANGE = { min: 0.2, max: 4 };
@@ -13,6 +14,10 @@ function ZoomScroll(events, canvas) {
     return Math.max(RANGE.min, Math.min(RANGE.max, scale));
   }
 
+  function reset() {
+    canvas.zoom('fit-viewport');
+  }
+
   function zoom(direction, position) {
 
     var currentZoom = canvas.zoom();
@@ -22,7 +27,7 @@ function ZoomScroll(events, canvas) {
   }
 
 
-  function initMouseWheel(element) {
+  function init(element) {
 
     mousewheel(element).on('mousewheel', function(event) {
 
@@ -51,11 +56,12 @@ function ZoomScroll(events, canvas) {
   }
 
   events.on('canvas.init', function(e) {
-    initMouseWheel(e.paper.node);
+    init(e.paper.node);
   });
 
   // API
   this.zoom = zoom;
+  this.reset = reset;
 }