Exercise 51

// P_2_1_3_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

/**
 * changing circle amount, size and position in a grid
 * 	 
 * MOUSE
 * position x          : circle amount and size
 * position y          : circle position
 * left click          : random position
 * 
 * KEYS
 * s                   : save png
 * p                   : save pdf
 */

import processing.pdf.*;
import java.util.Calendar;

boolean savePDF = false;

float tileCountX = 10;
float tileCountY = 10;
float tileWidth, tileHeight;

int count = 0;
int colorStep = 15;
int circleCount;
float endSize, endOffset;

int actRandomSeed = 0;


void setup() { 
  size(800, 800);
  tileWidth = width / tileCountX;
  tileHeight = height / tileCountY;
} 


void draw() { 
  if (savePDF) beginRecord(PDF, timestamp()+".pdf");

  smooth();
  noFill();
  stroke(0, 128);
  background(255); 
  randomSeed(actRandomSeed);

  translate((width/tileCountX)/2, (height/tileCountY)/2);

  circleCount = mouseX/30 + 1;
  endSize = map(mouseX, 0, width, tileWidth/2.0, 0);
  endOffset = map(mouseY, 0, height, 0, (tileWidth-endSize)/2);

  for (int gridY=0; gridY <= tileCountY; gridY++) {
    for (int gridX=0; gridX <= tileCountX; gridX++) {  
      pushMatrix();
      translate(tileWidth*gridX, tileHeight*gridY);
      scale(1, tileHeight/tileWidth);

      int toggle = (int) random(0, 4);
      if (toggle == 0) rotate(-HALF_PI);  
      if (toggle == 1) rotate(0);  
      if (toggle == 2) rotate(HALF_PI);  
      if (toggle == 3) rotate(PI);  

      // draw module
      for (int i=0; i < circleCount; i++) {
        float diameter = map(i, 0, circleCount-1, tileWidth, endSize);
        float offset = map(i, 0, circleCount-1, 0, endOffset);
        ellipse(offset, 0, diameter, diameter);
      }
      popMatrix();
    }
  }

  if (savePDF) {
    savePDF = false;
    endRecord();
  }
} 


void mousePressed() {
  actRandomSeed = (int) random(100000);
}


void keyReleased() {
  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);
}