// P_4_1_2_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.
/**
 * image feedback process.
 * 
 * KEYS
 * del, backspace      : clear screen
 * s                   : save png
 */
var img
function preload(){
    img = loadImage("data/urbier.jpg");
}

function setup() {
  createCanvas(700, 780);
  background(255);
  image(img,100,100);
}
function draw() {
  var x1 = random(0, width);
  var y1 = 0;
  var x2 = round(x1 + random(-7, 7));
  var y2 = round(random(-5, 5));
  var w = random(35, 50);
  var h = height;
  copy(img,x1,y1, w,h, x2+100,y2+100, w,h);
}

function keyPressed() {
  if(keyCode == DELETE || keyCode == BACKSPACE) {
    background(255);
    image(img,100,100);
  }
  if(key=='s' || key=='S') save("P_4_1_2_01.png");
}