// P_4_1_2_02
//
// 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.
/**
 * image feedback process.
 * 
 * KEYS
 * del, backspace      : clear screen
 * s                   : save png
 */

var img;

function preload(){
    img = loadImage("data/urbier.jpg");
}

function setup() {
  createCanvas(980, 980);
  //img = loadImage(selectInput("select an image"));
  background(255);
  image(img,0,0);
}

function draw() {
  var x1 = random(0,width);
  var y1 = random(0,height);

  var x2 = round(x1 + random(-10, 10));
  var y2 = round(y1 + random(-10, 10));

  var w = 150;
  var h = 50;

  copy(img,x1,y1, w,h, x2,y2, w,h);
}

function keyPressed() {
  if(keyCode == DELETE || keyCode == BACKSPACE) {
    background(255);
    image(img,0,0);
  }
  if(key=='s' || key=='S') save("P_4_1_2_02.png");
}