ArrowHelper: Reuse line geometry and cone geometry.

src/extras/helpers/ArrowHelper.js

@@ -14,38 +14,42 @@
  *  headWidth - Number
  */
 
-THREE.ArrowHelper = function ( dir, origin, length, color, headLength, headWidth ) {
-
-	// dir is assumed to be normalized
-
-	THREE.Object3D.call( this );
-
-	if ( color === undefined ) color = 0xffff00;
-	if ( length === undefined ) length = 1;
-	if ( headLength === undefined ) headLength = 0.2 * length;
-	if ( headWidth === undefined ) headWidth = 0.2 * headLength;
-
-	this.position.copy( origin );
+THREE.ArrowHelper = ( function (){
 
 	var lineGeometry = new THREE.Geometry();
 	lineGeometry.vertices.push( new THREE.Vector3( 0, 0, 0 ) );
 	lineGeometry.vertices.push( new THREE.Vector3( 0, 1, 0 ) );
 
-	this.line = new THREE.Line( lineGeometry, new THREE.LineBasicMaterial( { color: color } ) );
-	this.line.matrixAutoUpdate = false;
-	this.add( this.line );
-
 	var coneGeometry = new THREE.CylinderGeometry( 0, 0.5, 1, 5, 1 );
 	coneGeometry.applyMatrix( new THREE.Matrix4().makeTranslation( 0, - 0.5, 0 ) );
 
-	this.cone = new THREE.Mesh( coneGeometry, new THREE.MeshBasicMaterial( { color: color } ) );
-	this.cone.matrixAutoUpdate = false;
-	this.add( this.cone );
+	return function ( dir, origin, length, color, headLength, headWidth ) {
+
+		// dir is assumed to be normalized
 
-	this.setDirection( dir );
-	this.setLength( length, headLength, headWidth );
+		THREE.Object3D.call( this );
 
-};
+		if ( color === undefined ) color = 0xffff00;
+		if ( length === undefined ) length = 1;
+		if ( headLength === undefined ) headLength = 0.2 * length;
+		if ( headWidth === undefined ) headWidth = 0.2 * headLength;
+
+		this.position.copy( origin );
+
+		this.line = new THREE.Line( lineGeometry, new THREE.LineBasicMaterial( { color: color } ) );
+		this.line.matrixAutoUpdate = false;
+		this.add( this.line );
+
+		this.cone = new THREE.Mesh( coneGeometry, new THREE.MeshBasicMaterial( { color: color } ) );
+		this.cone.matrixAutoUpdate = false;
+		this.add( this.cone );
+
+		this.setDirection( dir );
+		this.setLength( length, headLength, headWidth );
+
+	}
+
+}() );
 
 THREE.ArrowHelper.prototype = Object.create( THREE.Object3D.prototype );