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Filled Circle
April 24, 2003 08:28 AM
I''m trying to figure out a way of drawing a filled circle. I want to be able to make it any size I want of any color. Does OpenGL have an easy way to do this?
122
April 24, 2003 10:33 AM
Agreed, use some quadrics. lesson 18(i think) teaches you how to use them.
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514
April 24, 2003 12:31 PM
#include <math.h>void disk(GLdouble radius, GLuint slices){ GLuint i; glBegin(GL_TRIANGLE_FAN); glVertex2i(0,0); for (i=0;i<=slices;i++) { GLdouble angle = (GLdouble)i*M_PI*2. / (GLdouble)slices; glVertex2d(radius*cos(angle), radius*sin(angle)); } glEnd();} This is the standard way.
You can also skip the first and last vertices (slightly faster) :
#include <math.h>void disk(GLdouble radius, GLuint slices){ GLuint i; glBegin(GL_TRIANGLE_FAN); for (i=0;i<slices;i++) { GLdouble angle = (GLdouble)i*M_PI*2. / (GLdouble)slices; glVertex2d(radius*cos(angle), radius*sin(angle)); } glEnd();} You can set this into a display list, which is recommended if the number of slices is "big".
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