/* A program to generate a grid of random
 Truchet tiles using arcs.  
 by Brock Craft
 http://www.brockcraft.com
 12 Mar 2008
 */

PImage p;
PImage q;
int imageX=0;
int imageY=0;
int sceneSize=401;
int numTiles=sceneSize-143; // a kludge to make the tiles fit the scene
boolean over=false;

Truchet truchet[] = new Truchet[numTiles];

void setup(){
  size (sceneSize,sceneSize); //must be divisible by 25!
  smooth();
  noFill();
  ellipseMode(CORNER);
  rectMode(CORNER);
  p=loadImage("tile1-1.png");
  q=loadImage("tile1-2.png");
  for (int h=0;h<numTiles;h++){
    int r=int(random(2));
    truchet[h]=new Truchet(imageX,imageY,r);
    imageX=imageX+25;
    if (imageX==sceneSize-1){  // -1 is a kludge so that the boxes are drawn to the extents of the scene
      imageX=0;
      imageY=imageY+25;
    } 
  }

}

void draw(){
  background(153);
  for (int i=0;i<numTiles;i++){
    truchet[i].render();
    if(truchet[i].isOver()){
      if (mousePressed){
      truchet[i].flip();
      delay(200);  // this is a kludge for debouncing the mouse
      }
    } 
  }
  if (keyPressed){
    for (int i=0;i<numTiles;i++){
      truchet[i].reseed(); 
    }   
  }

}


class Truchet {

  int myX;
  int myY;
  int orientation;

  Truchet (int xpos, int ypos, int orientn){

    myX=xpos;
    myY=ypos; 
    orientation=orientn;

  }

  void render(){
    if (orientation==0){
 
      // instead of using images, you can draw the curves with vector graphics
      // uncomment the code below to do this
      image(p,myX,myY);
      // stroke(53);
     // arc(myX-12.5,myY-12.5,25,25,0,PI/2);
     // arc(myX+12.5,myY+12.5,25,25,PI, TWO_PI-PI/2);
     // stroke(200);
     // rect(myX,myY,25,25);
    } 
    else {
      image(q,myX,myY);
      //stroke(53);
      //arc(myX+12.5,myY-12.5,25,25,PI/2,PI);
      //arc(myX-12.5,myY+12.5,25,25,TWO_PI-PI/2,TWO_PI);
      //stroke(200);
      //rect(myX,myY,25,25);
    }
  }

  void reseed(){
    int r=int(random(2));
    orientation=r;
  }

  boolean isOver(){
    if(mouseX >=myX && mouseX<=myX+25 &&
      mouseY>=myY && mouseY<=myY+25){
      return true; 
    } 
    else {
      return false;
    }
  }

  void flip () {
    orientation=abs(orientation-1);

}


}