Merge pull request nexus-js#124 from starfishmod/master

Added restrictions to Envelope

lib/interfaces/envelope.js

@@ -9,6 +9,12 @@ let Point = function(point,envelope) {
 
   this.x = point.x;
   this.y = point.y;
+
+  this.xMin = point.xMin || 0;
+  this.xMax = point.xMax || 1;
+  this.yMin = point.yMin || 0;
+  this.yMax = point.yMax || 1;
+
   this.envelope = envelope;
 
   this.element = svg.create('circle');
@@ -35,10 +41,16 @@ let Point = function(point,envelope) {
       let nextNode = this.envelope.nodes[nextIndex];
 
       let lowX = prevIndex >= 0 ? prevNode.x : 0;
+	  lowX = lowX<this.xMin?this.xMin:lowX;
+
       let highX = nextIndex < this.envelope.nodes.length ? nextNode.x : 1;
-
-      if (this.x < lowX) { this.x = lowX; }
+	  highX = highX>this.xMax?this.xMax:highX;
+
+	  if (this.x < lowX) { this.x = lowX; }
       if (this.x > highX) { this.x = highX; }
+
+      if (this.y < this.yMin) { this.x = this.yMin; }
+      if (this.y > this.yMax) { this.x = this.yMax; }
 
     }
 
@@ -79,6 +91,7 @@ let Point = function(point,envelope) {
 * @example
 * var envelope = new Nexus.Envelope('#target',{
 *   'size': [300,150],
+*   'noNewPoints': false,
 *   'points': [
 *     {
 *       x: 0.1,
@@ -119,6 +132,7 @@ export default class Envelope extends Interface {
 
     let defaults = {
       'size': [300,150],
+      'noNewPoints':false,
       'points': [
   			{
   				x: 0.1,
@@ -306,7 +320,7 @@ export default class Envelope extends Interface {
   	}
 
     // if not very close to any node, create a node
-  	if (nearestDist>0.07) {
+  	if (!this.settings.noNewPoints && nearestDist>0.07) {
 
       nearestIndex = this.getIndexFromX(this.mouse.x/this.width);