Hi all,

I'm new here. Excited with processing and barely figuring it out (new to the world of coding as well). I apologize if I'm posting in the wrong place. I also tried searching quite a bit for an answer but couldn't find anything.

Everything has been running fine for a while, but when I started running sketched I started to get this error:

"Cannot find a class or type named "Calendar"

Right now I am experimenting with examples in processing—primarily those that accompany the book " Generative Design (Gestaltung).

I suppose I should post the code... here goes:

Any help is greatly appreciated.

1. // P_1_1_1_01.pde
   //
   // Generative Gestaltung, ISBN: 978-3-87439-759-9
   // First Edition, Hermann Schmidt, Mainz, 2009
   // Hartmut Bohnacker, Benedikt Gross, Julia Laub, Claudius Lazzeroni
   // Copyright 2009 Hartmut Bohnacker, Benedikt Gross, Julia Laub, Claudius Lazzeroni
   //
   // http://www.generative-gestaltung.de
   //
   // Licensed under the Apache License, Version 2.0 (the "License");
   // you may not use this file except in compliance with the License.
   // You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
   // Unless required by applicable law or agreed to in writing, software
   // distributed under the License is distributed on an "AS IS" BASIS,
   // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   // See the License for the specific language governing permissions and
   // limitations under the License.
   
   /**
    * draw the color spectrum by moving the mouse
    *      
    * MOUSE
    * position x/y        : resolution
    *
    * KEYS
    * s                   : save png
    * p                   : save pdf
    */
   
   import processing.pdf.*;
   boolean savePDF = false;
   
   int stepX;
   int stepY;
   
   void setup(){
     size(800, 400);
     background(0);
   }
   
   void draw(){
     if (savePDF) beginRecord(PDF, timestamp()+".pdf");
   
     noStroke();
     colorMode(HSB, width, height, 100);
   
     stepX = mouseX+2;
     stepY = mouseY+2;
     for (int gridY=0; gridY<height; gridY+=stepY){
       for (int gridX=0; gridX<width; gridX+=stepX){
         fill(gridX, height-gridY, 100);
         rect(gridX, gridY, stepX, stepY);
       }
     }
   
     if (savePDF) {
       savePDF = false;
       endRecord();
     }
   }
   
   void keyPressed() {
     if (key=='s' || key=='S') saveFrame(timestamp()+"_##.png");
     if (key=='p' || key=='P') savePDF = true;
   }
   
   // timestamp
   String timestamp() {
     Calendar now = Calendar.getInstance();
     return String.format("%1$ty%1$tm%1$td_%1$tH%1$tM%1$tS", now);
   }