Hey, I am a new OpenGL user. trying to learn it.
here I tried to draw PacMan.but got stuck while trying to shut and open PacMan’s mouth. please help me out.
I am using Triangle_Fan for draw the circle using a loop.
Could you share the code for rendering the pacman ?
Try the following code :
glColor4f(1f, 1f, 0f, 1f);
int centerx = 1000;
int centery = 500;
float angleMouth = 30f * 3.1415926f / 180.0f; //(in radians)
glBegin(GL_TRIANGLE_FAN);
glVertex(centerx, centery);
for(int i = 0; i < 100; i++) {
float angle = angleMouth/2f + (3.1415926f * 2.0f - angleMouth) * (float) i / (float) 99.0f;
glVertex(centerx + 100 * Math.cos(angle), centery + 100 * Math.sin(angle));
}
glEnd();
Change the angleMouth parameter to change the mouth opening. (note that this is written in JOGL, use the appropriate sine and cosine functions for your application).
Finally, these are the vertex functions :
private void glVertex(double x, double y) {
gl.glVertex2d(getXScreen(x), getYScreen(y));
}
double getXScreen(double x) {
return 2f * (x + 0.5) / (double) panel.getWidth() - 1f;
}
double getYScreen(double y) {
return 2f * (y + 0.5) / (double) panel.getHeight() - 1f;
}
Again, this is in java, use the appropriate equivalent synthax in whatever language you’re using