Attempted to render a circle in opengl es 1.1, renders as oval
- by eipxen
Hi all,
I attempted to render a circle in opengl es 1.1 as a test before building a larger program, but it renders as an oval. Here is the code I use to generate and render my vertices:
static const int numVerts = 40;
static GLfloat myFirstCircle[82];
myFirstCircle[0] = 0.0f;
myFirstCircle[1] = 0.0f;
for (int i = 2; i < (numVerts+1)*2; i+=2) {
myFirstCircle[i] = .5 * cosf(i*2*3.14159/numVerts);
myFirstCircle[i+1] = .5 * sinf(i*2*3.14159/numVerts);
}
glVertexPointer(2, GL_FLOAT, 0, myFirstCircle);
glEnableClientState(GL_VERTEX_ARRAY);
glDrawArrays(GL_TRIANGLE_FAN, 0, 22);
I'm still somewhat new to this system, so I may have a silly error that I do not see, but it seems to me like this should generate 40 vertices on a circle of radius .5. When it renders, the shape on screen appears to be an oval, significantly taller than it is wide.
My question is thus: why is my circle rendering this way, and what could I do to fix it? This is the first question on stackoverflow, so I'm not sure how to share an image of my output.
