Thread: how can i fill a triangle?

I want to fill with color a triangle?

For each x draw a line such that x -> T(x), :-D (imagine integrals). This could be a stupid answer, i mean I guess there's a better way to do it.

I do know OpenGL supports such functionality, just envoke the right properties or something, google.com.

If your triangle is at an angle you'd just find the slope and include it in to the calculation for x->T(x), where T(x) is each point of the triangle above what ever side you use as the base.

Like if you're using side A, then draw a line from every point at A to B->C, or just C/B if it's 90d triangle...

This is probably a really dumb idea since it would likely take a lot of calculations and there's probably low level API exposed in what your using to fill shapes.

Why didn't you just google what ever your using and look for documentation... ?

How on earth do you just say "i want to fill a triangle with a color." I can't read your freaking mind!!! What are you making triangles with? Noodles? Because if your using noodles, just pour the sauce in the gap.

Or if you made a triangle with plastic spoons, I'd probably use cardboard cut outs, make sure to get a variety pack of colored papers.

*sorry, -I- couldn't resist.*

quick OpenGL code

Code:

glColor3f(1.0, 1.0, 1.0);//fils triangle with white
glBegin(GL_TRIANGLES);
  glVertex3f(-1.0, -1.0, 0.0);  //bottom left vertex
  glVertex3f(0.0, 1.0, 0.0);  //top vertex
  glVertex3f(1.0, -1.0, 0.0);  //bottom right vertex
glEnd();

Originally Posted by psychopath

I dunno, do you? Be sure to weigh the pros and cons first and make sure you really want to fill a triangle with colour.

EDIT: sorry, I couldn't resist.

I love it! I was thinking the same thing before I saw your post.

If you use GDI you can call CreatePolygonRgn() and FillRgn

Originally Posted by psychopath

I dunno, do you? Be sure to weigh the pros and cons first and make sure you really want to fill a triangle with colour.

EDIT: sorry, I couldn't resist.

I think you guys are not funny at all, despite how hard you're trying to.
Any idiot can see that he's looking for an efficient solution, and that the question mark was just a typo. If you knew a way, you didn't have to know his graphics library to explain it.
If you think you know a function call to do this, the only thing you would ask is: "What graphics API are you using". Period.
Question mark, actually.
But you seem to know none of these, so we don't need your comments at all.