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  Help understanding the code  (Read 941 times)
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Offline daimous

Junior Newbie





« Posted 2009-12-12 15:01:45 »

Hi Guys hel please.. I'm new to open gl programming ...Can any body please help me or at least give me idea on what subdivideCircle, normalize, and drawtriangle functions is trying to do? Thanks ina advance!

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  // subdivide a triangle recursively, and draw them
    private void subdivideCircle(int radius, float[] v1, float[] v2, int depth)
    {
        float v11[] = new float[3];
        float v22[] = new float[3];
        float v00[] = {0, 0, 0};
        float v12[] = new float[3];
        if (depth==0)
        {
            //5. specify a color related to triangle location
            gl.glColor3f(v1[0]*v1[0], v1[1]*v1[1], v1[2]*v1[2]);
            for (int i = 0; i<3; i++)
            {
                v11[i] = v1[i]*radius;
                v22[i] = v2[i]*radius;
            }
            drawtriangle(v11, v22, v00);
            return;
        }
        v12[0] = v1[0]+v2[0];
        v12[1] = v1[1]+v2[1];
        v12[2] = v1[2]+v2[2];
        normalize(v12);
        // subdivide a triangle recursively, and draw them
        subdivideCircle(radius, v1, v12, depth-1);
        subdivideCircle(radius, v12, v2, depth-1);
    }

    // draw a circle with center at the origin in xy plane
    public void drawCircle(int cRadius, int depth)
    {
        subdivideCircle(cRadius, cVdata[0], cVdata[1], depth);
        subdivideCircle(cRadius, cVdata[1], cVdata[2], depth);
        subdivideCircle(cRadius, cVdata[2], cVdata[3], depth);
        subdivideCircle(cRadius, cVdata[3], cVdata[0], depth);
    }

    // normalize a 3D vector
    public void normalize(float vector[])
    {
        float d = (float)Math.sqrt(vector[0]*vector[0]
        +vector[1]*vector[1] + vector[2]*vector[2]);
        if (d==0)
        {
            System.out.println("0 length vector: normalize().");
            return;
        }
        vector[0] /= d;
        vector[1] /= d;
        vector[2] /= d;
    }

    public void drawtriangle(float[] v1, float[] v2, float[] v3)
    {
        gl.glBegin(GL.GL_TRIANGLES);
        gl.glVertex3fv(v1);
        gl.glVertex3fv(v2);
        gl.glVertex3fv(v3);
        gl.glEnd();
    }
Offline Eli Delventhal

JGO Kernel


Medals: 42
Projects: 11
Exp: 10 years


Game Engineer


« Reply #1 - Posted 2009-12-12 23:34:21 »

If you can't figure it out yourself, you're probably in trouble anyway. Just use the functions and don't worry about what's under the hood, or start from the beginning and learn OpenGL from  the ground up. One or the other.

Also, Off Topic is the wrong forum for this. Moved.

See my work:
OTC Software
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