// P_2_1_3_01
//
// 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.

/**
 * 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
 */

var tileCountX = 10;
var tileCountY = 10;
var tileWidth, tileHeight;
var count = 0;
var colorStep = 15;
var circleCount;
var endSize, endOffset;
var actRandomSeed = 0;

function setup() { 
  createCanvas(780, 780);
  tileWidth = width / tileCountX;
  tileHeight = height / tileCountY;
} 

function draw() { 
  smooth();
  noFill();
  stroke(0, 128);
  background(255); 
  randomSeed(actRandomSeed);
  push();
  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);
  pop();
  for (var gridY=0; gridY<=tileCountY; gridY++) {
    for (var gridX=0; gridX<=tileCountX; gridX++) {  
      push();
      translate(tileWidth*gridX, tileHeight*gridY);
      scale(1, tileHeight/tileWidth);

      var 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(var i=0; i<circleCount; i++) {
        var diameter = map(i, 0,circleCount-1, tileWidth,endSize);
        var offset = map(i, 0,circleCount-1, 0,endOffset);
        ellipse(offset, 0, diameter,diameter);
      }
      pop();
    }
  }
} 

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

function keyTyped() {
  if (key == 's' || key == 'S') save("P_2_1_3_01.png");
}