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Index › Programming Questions & Help › Programs › Highlighting checkerboard square
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Highlighting checkerboard square? (Read 1347 times)
whiskeyii
Highlighting checkerboard square?
Feb 15th, 2010, 2:14pm  
Hey, everybody!

So, I've been trying to write a program for the basics of a "Chess game" program. So far I've been able to build my checkerboard, but I've having trouble figuring out how to highlight the square my mouse hovers over. My best guess is that a series of lines are drawn according to the mouse position. Here's what I've got so far: (Please be gentle! I'm still a little new to processing.)

void setup(){
 size (400, 400);
 smooth();
}

void draw(){
  for(int i=0; i<=400; i=i+50) {
   for(int j=0; j<=400; j=j+50)  
   {  
    if((i+j)%20==0) {  
   fill(0);      
} else  {  
   fill(200,0,0);
   }  
   rect (i, j, 100, 100);
   }
  }
}

  /* Highlight square mouse is on
  if(mouseX==i && mouseY==j){
    stroke(255,255,206);
    line(i,j,i+50,j+50);
  }*/

Thanks!
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PhiLho 
Re: Highlighting checkerboard square?
Reply #1 - Feb 15th, 2010, 2:47pm  
As I always say, use named constants instead of magical numbers, thus signification of those numbers is clearer. See:
Code:
int SQUARE_SIZE = 50;

void setup(){
 size (400, 400);
 smooth();
}

void draw(){
  for (int i = 0; i < width; i += SQUARE_SIZE) {
   for (int j = 0; j < height; j += SQUARE_SIZE)  
   {  
    if ((i + j) % 20 == 0) {  
     fill(0);	
    } else {  
     fill(200, 0, 0);
    }  
    rect (i, j, SQUARE_SIZE, SQUARE_SIZE);
   }
  }
  
  int tlx = SQUARE_SIZE * (mouseX / SQUARE_SIZE);
  int tly = SQUARE_SIZE * (mouseY / SQUARE_SIZE);
  fill(255, 0, 0);
  rect (tlx, tly, SQUARE_SIZE, SQUARE_SIZE);
}
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WWW  
Chrisir
Re: Highlighting checkerboard square?
Reply #2 - Feb 17th, 2010, 3:10pm  
When I tried this,
this page made me very happy:

http://commons.wikimedia.org/wiki/Category:Standard_chess_tiles

you have there all the tiles.

Greetings!
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