// Drawing utilities -----------------------------------------------------------

#include "utils.h"

#include <cmath>

void
draw_circle(GLfloat ox, GLfloat oy, GLfloat radius, int triangles)
{
    int i;
    GLfloat angle;

    glBegin(GL_TRIANGLE_FAN); {
	glVertex2f(ox, oy);
	for (i = 0; i <= triangles; i++) {
	    angle = i * 2.0 * M_PI / triangles;
	    glVertex2f(ox + radius * cos(angle), oy + radius * sin(angle));
	}
    } glEnd();
}

    void
draw_semicircle(GLfloat ox, GLfloat oy, GLfloat radius, int triangles, int direction)
{
    int i;
    GLfloat angle;

    glBegin(GL_TRIANGLE_FAN); {
	glVertex2f(ox, oy);
	for (i = 0; i <= triangles; i++) {
	    angle = i * M_PI * direction / triangles;
	    glVertex2f(ox + radius * cos(angle), oy + radius * sin(angle));
	}
    } glEnd();
}

// vim: set sts=4 sw=4 ts=8 ft=cpp: --------------------------------------------