hello… i have drawn a circle and i want to fill it with color… how can i do it??
the code is the following:
#include <glut.h>
#include <math.h>
#define PI 3.14159
#define circlePoints 256
int i;
void display()
{
GLfloat angularStep=2*PI/(float)circlePoints;
GLuint pointsPerQuadrant=circlePoints/4;
GLfloat x[circlePoints];
GLfloat y[circlePoints];
GLfloat radius=20;
glClearColor(0,0,0,0);
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(0,1,0);
glLineWidth(3);
//Defining the circle points
for(i=0;i<pointsPerQuadrant/2;i++)
{
//Define points in first quadrant
x[i]=radius*cos(i*angularStep);
y[i]=radius*sin(i*angularStep);
x[pointsPerQuadrant-1-i]=y[i];
y[pointsPerQuadrant-1-i]=x[i];
//Define points in second quadrant
x[pointsPerQuadrant+i]=-y[i];
y[pointsPerQuadrant+i]=x[i];
x[2*pointsPerQuadrant-1-i]=-x[i];
y[2*pointsPerQuadrant-1-i]=y[i];
//Define points in third quadrant
x[2*pointsPerQuadrant+i]=-x[i];
y[2*pointsPerQuadrant+i]=-y[i];
x[3*pointsPerQuadrant-1-i]=-y[i];
y[3*pointsPerQuadrant-1-i]=-x[i];
//Define points in fourth quadrant
x[3*pointsPerQuadrant+i]=y[i];
y[3*pointsPerQuadrant+i]=-x[i];
x[4*pointsPerQuadrant-1-i]=x[i];
y[4*pointsPerQuadrant-1-i]=-y[i];
}
//Connecting the circle points with lines
glBegin(GL_LINE_LOOP);
for (i=0;i<circlePoints;i++)
{
glVertex2f(x[i],y[i]);
}
glEnd();
glFlush();
}
int main(int argc, char** argv)
{
glutInit(&argc,argv);
glutInitWindowPosition(50,50);
glutInitWindowSize(640,480);
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGBA);
glutCreateWindow("Circle drawing");
glMatrixMode(GL_PROJECTION);
gluOrtho2D(-32,32,-24,24);
glutDisplayFunc(display);
glutMainLoop();
return 0;
}
i am using the LINE_LOOP and the cicle symmetry… i want only to fill it… plz dont give me alternative code, because the instruction of the project are very specific…
