fixing bug with blendmode

Author: lauren mccarthy

lib/p5.js

@@ -1,4 +1,4 @@
-/*! p5.js v0.3.6 September 16, 2014 */
+/*! p5.js v0.3.6 September 18, 2014 */
 var shim = function (require) {
     window.requestDraw = function () {
       return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (callback, element) {
@@ -584,6 +584,7 @@ var p5Graphics = function (require, core, constants) {
       this.drawingContext.fillStyle = '#FFFFFF';
       this.drawingContext.strokeStyle = '#000000';
       this.drawingContext.lineCap = constants.ROUND;
+      this.drawingContext.font = 'normal 12px sans-serif';
     };
     p5.Graphics.prototype = Object.create(p5.Element.prototype);
     p5.Graphics.prototype.resize = function (w, h) {
@@ -3977,7 +3978,7 @@ var renderingrendering = function (require, core, constants) {
       return pg;
     };
     p5.prototype.blendMode = function (mode) {
-      if (mode === constants.BLEND || mode === constants.DARKEST || mode === constants.LIGHTEST || mode === constants.DIFFERENCE || mode === constants.MULTIPLY || mode === constants.EXCLUSION || mode === constants.SCREEN || mode === constants.REPLACE || mode === constants.OVERLAY || mode === constants.HARD_LIGHT || mode === constants.SOFT_LIGHT || mode === constants.DODGE || mode === constants.BURN) {
+      if (mode === constants.BLEND || mode === constants.DARKEST || mode === constants.LIGHTEST || mode === constants.DIFFERENCE || mode === constants.MULTIPLY || mode === constants.EXCLUSION || mode === constants.SCREEN || mode === constants.REPLACE || mode === constants.OVERLAY || mode === constants.HARD_LIGHT || mode === constants.SOFT_LIGHT || mode === constants.DODGE || mode === constants.BURN || mode === constants.ADDITIVE || mode === constants.NORMAL) {
         this.drawingContext.globalCompositeOperation = mode;
       } else {
         throw new Error('Mode ' + mode + ' not recognized.');