// P_2_3_1_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. 

/**
 * draw tool. draw with a rotating line. 
 * 
 * MOUSE
 * drag                : draw
 * 
 * KEYS
 * 1-4                 : switch default colors
 * del, backspace      : clear screen
 * d                   : reverse direction and mirrow angle 
 * space               : new random color
 * arrow left          : rotaion speed -
 * arrow right         : rotaion speed +
 * arrow up            : line length +
 * arrow down          : line length -
 * s                   : save png
 */

var lineLength = 0;
var angle = 0;
var angleSpeed = 1.0;
var col;
var state = 1;

function setup() {
  // use full screen size 
  createCanvas(780, 780);
  background(255);
  smooth();
  cursor(CROSS);
}
function draw() {
  if (mouseIsPressed) {
    if (state == 1){
    push();
    col = color(181,157,0,100);
    strokeWeight(1.0); 
    noFill();
    stroke(col);
    translate(mouseX,mouseY);
    rotate(radians(angle));
    line(0, 0, lineLength, 0);
    pop();
    angle += angleSpeed;
    }
     if (state == 2){
    push();
    col = color(0,130,164,100);
    strokeWeight(1.0); 
    noFill();
    stroke(col);
    translate(mouseX,mouseY);
    rotate(radians(angle));
    line(0, 0, lineLength, 0);
    pop();
    angle += angleSpeed;
    }
     if (state == 3){
    push();
     col = color(87,35,129,100);
    strokeWeight(1.0); 
    noFill();
    stroke(col);
    translate(mouseX,mouseY);
    rotate(radians(angle));
    line(0, 0, lineLength, 0);
    pop();
    angle += angleSpeed;
    }
     if (state == 4){
    push();
   col = color(197,0,123,100);
    strokeWeight(1.0); 
    noFill();
    stroke(col);
    translate(mouseX,mouseY);
    rotate(radians(angle));
    line(0, 0, lineLength, 0);
    pop();
    angle += angleSpeed;
    }
   
  }
}

function mousePressed() {
  // create a new random line length
  lineLength = random(70, 200);
}

function keyTyped() {
  if (key == 's' || key == 'S') save("P_2_3_1_01.png");
  // reverse direction and mirrow angle
  if (key=='d' || key=='D') {
    angle = angle + 180;
    angleSpeed = angleSpeed * -1;
  }
  //default colors from 1 to 4 
  if (key == '1') state = 1;
  if (key == '2') state = 2;
  if (key == '3') state = 3;
  if (key == '4') state = 4;
}

function keyPressed() {
   if (keyCode == DELETE || keyCode == BACKSPACE) background(255);
  if (keyCode == UP_ARROW) lineLength += 10;
  if (keyCode == DOWN_ARROW) lineLength -= 10; 
  if (keyCode == LEFT_ARROW) angleSpeed -= 0.5;
  if (keyCode == RIGHT_ARROW) angleSpeed += 0.5; 
}