// P_2_2_3_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.
/**
 * form mophing process by connected random agents
 * two forms: circle and line
 * 
 * MOUSE
 * click               : start a new circe
 * position x/y        : direction and speed of floating
 * 
 * KEYS
 * 1-2                 : fill styles
 * 3-4                 : form styles circle/line
 * arrow up/down       : step size +/-
 * f                   : freeze. loop on/off
 * Delete/Backspace    : clear display
 * s                   : save png
 */

var formResolution = 15;
var stepSize = 2;
var distortionFactor = 1;
var initRadius = 150;
var centerX, centerY;
var x = [];
var y = [];

var filled = false;
var freeze = false;
var mode = 0;


function setup(){
  // use fullscreen size 
  createCanvas(780, 780);
  smooth();

  // init form
  centerX = width/2; 
  centerY = height/2;
  var angle = radians(360/float(formResolution));
  for (var i=0; i<formResolution; i++){
    x[i] = cos(angle*i) * initRadius;
    y[i] = sin(angle*i) * initRadius;  
  }

  stroke(0, 50);
  background(255);
}


function draw(){
  // floating towards mouse position
  if (mouseX != 0 || mouseY != 0) {
    centerX += (mouseX-centerX) * 0.01;
    centerY += (mouseY-centerY) * 0.01;
  }

  // calculate new points
  for (var i=0; i<formResolution; i++){
    x[i] += random(-stepSize,stepSize);
    y[i] += random(-stepSize,stepSize);
    // ellipse(x[i], y[i], 5, 5);
  }

  strokeWeight(0.75);
  if (filled) fill(random(255));
  else noFill();

  if (mode == 0) {
    beginShape();
    // start controlpoint
    curveVertex(x[formResolution-1]+centerX, y[formResolution-1]+centerY);

    // only these points are drawn
    for (var i=0; i<formResolution; i++){
      curveVertex(x[i]+centerX, y[i]+centerY);
    }
    curveVertex(x[0]+centerX, y[0]+centerY);

    // end controlpoint
    curveVertex(x[1]+centerX, y[1]+centerY);
    endShape();
  }

  if (mode == 1) {
    beginShape();
    // start controlpoint
    curveVertex(x[0]+centerX, y[0]+centerY);

    // only these points are drawn
    for (var i=0; i<formResolution; i++){
      curveVertex(x[i]+centerX, y[i]+centerY);
    }

    // end controlpoint
    curveVertex(x[formResolution-1]+centerX, y[formResolution-1]+centerY);
    endShape();
  }

}

function mousePressed() {
  // init forms on mouse position
  centerX = mouseX; 
  centerY = mouseY;

  // circle
  if (mode == 0) {
    centerX = mouseX;
    centerY = mouseY;
    var angle = radians(360/float(formResolution));
    var radius = initRadius * random(0.5,1.0);
    for (var i=0; i<formResolution; i++){
      x[i] = cos(angle*i) * radius;
      y[i] = sin(angle*i) * radius;
    }
  } 

  // line
  if (mode == 1) {
    centerX = mouseX;
    centerY = mouseY;
    var radius = initRadius * random(0.5,5.0);
    var angle = random(PI);
    radius = initRadius*4;
    angle = 0;
    
    var x1 = cos(angle) * radius;
    var y1 = sin(angle) * radius;
    var x2 = cos(angle-PI) * radius;
    var y2 = sin(angle-PI) * radius;
    for(var i=0; i<formResolution; i++) {
      x[i] = lerp(x1, x2, i/float(formResolution));
      y[i] = lerp(y1, y2, i/float(formResolution));
    }
  }
}


function keyPressed() {
  if (keyCode == UP_ARROW) stepSize++;
  if (keyCode == DOWN_ARROW) stepSize--;
  stepSize = max(stepSize, 1);
  println("stepSize: " + stepSize);
    if (keyCode == DELETE || keyCode == BACKSPACE) background(255);
}

function keyTyped() {
  if (key == 's' || key == 'S') save("P_2_2_3_02.png");

  if (key == '1') filled = false;
  if (key == '2') filled = true;
  if (key == '3') mode = 0;
  if (key == '4') mode = 1;
  // switch draw loop on/off
  if (key == 'f' || key == 'F') freeze = !freeze;
  if (freeze == true) noLoop();
  else loop();
}