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OpenGL- Fill in Circle

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Started by Vladk10000 December 04, 2005 04:42 PM

2 comments, last by geowar 12 years, 10 months ago

Vladk10000

150

Author

December 04, 2005 04:42 PM

I was just wondering, how do I fill in a circle with a color? Here's my code:


glBegin(GL_LINE_LOOP);
    for(int i =0;i<num_lines;i++)
    {    
    angle = i*2*3.14159/num_lines;
    glVertex2f(cos(angle),sin(angle));
    }
glEnd();

It's probably very easy. Thanks.

Ultra Tech

Sneftel

1,788

December 04, 2005 04:43 PM

GL_LINE_LOOP is a loop made up of line segments. You probably don't want line segments, you want a polygon. So try GL_POLYGON. Keep in mind that under normal culling mode, the vertices have to be in counterclockwise order.

Vladk10000

150

Author

December 04, 2005 07:34 PM

Thanks, it worked.

Ultra Tech

geowar

122

June 20, 2011 08:04 PM

[color=#333333][font=Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif][size=2]If it's a filled circle:

glEnable(GL_POINT_SMOOTH);
glHint(GL_POINT_SMOOTH_HINT, GL_NICEST);
glPointSize(radius);
glPoint(x, y, z);[/font]

-- Enjoy,George Warner,Schizophrenic Optimization ScientistApple Developer Technical Support (DTS)