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Index › Programming Questions & Help › Syntax Questions › Problem making a for loop of triangles
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Problem making a for loop of triangles (Read 667 times)
HB4762
Problem making a for loop of triangles
Nov 24th, 2009, 4:57pm  
Hi, I'm very new to Processing, have only been using it for two weeks. I'm still having a bit of trouble with using loops in generating 2D line images.

I have some code I'm writing right now and I can't work out why the triangles won't loop the way I'd like them too.

Is anyone able to help by telling me how I can create a window of triangles from one triangle's parameters?

The triangle's parameters before I try and generalise them into a for loop are triangle(0,25,50,0,50,25); and I just want the next triangle to start right from the edges of the proceeding triangle.

Any help would be greatly appreciated thanks.


void setup()
{
 size(500,500);
 background(0);
 stroke(250);
 strokeWeight(0.5);
 smooth();
 
}

int space=50;

void tri()
{
 background(0);
 noFill();
 strokeWeight(1);
 
 for (int x = 0; x < 10; x = x+1)
 {
   for (int y = 0; y < 10; y = y+1)
   {
     triangle(0,3*y*(space/2),x*space,0,x*space,3*y*(space/2));
   }
 }
}

void circle()
{
 {
 translate(space/2,space/2);
 
 noFill();
 stroke(255);
 strokeWeight(0.5);
 
 for(int x = 0; x < 10; x = x+1)
 {
   for(int y = 0; y < 10; y = y+1)
   {
     ellipse(x*space,y*space,space,space);
   }
 }
 }
}

void draw()
{
 
 background(0);
 
 tri();
 circle();
 
}
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Cedric
Re: Problem making a for loop of triangles
Reply #1 - Nov 24th, 2009, 5:43pm  
if you closely look at your triangle you can tell that it can not work.
there are 2 variables that are always 0 for example...

this is one way to do it :
for (int x = 0; x < 10; x = x+1)
{
  for (int y = 0; y <= 10; y = y+1)
  {
     triangle(space*x,space*y,space*x+(space/2),y*space-space,space*x+space,space*y);

  }
}

another maybe easier one would be to simply write
for (int x = 0; x < 10; x = x+1)
{
  for (int y = 0; y <= 10; y = y+1)
  {
     pushMatrix();
     translate(x*space,y*space);
     triangle(0,space,space/2,0,space,space);
     popMatrix();
  }
}
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Cedric
Re: Problem making a for loop of triangles
Reply #2 - Nov 24th, 2009, 5:44pm  
oh and instead of x = x+1 you can just write x++

and there is a command called ellipseMode(CENTER);
that centers the ellipse so you dont have to do that translation.
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HB4762
Re: Problem making a for loop of triangles
Reply #3 - Nov 24th, 2009, 7:49pm  
oh right that's fantastic, yeah and centering the ellipse like that works well. thanks so much for your help- that's really kind!

Have a good day!
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