draw Sphere with OpenGL - Java javax.media.opengl

Java examples for javax.media.opengl:GL

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Description

draw Sphere with OpenGL

Demo Code


import java.util.ArrayList;
import java.util.List;
import javax.microedition.khronos.opengles.GL10;

public class Main{
    public static void drawSphere(GL10 gl, float r, int stack, int slice) {
        List<Float> coords = new ArrayList<Float>();
        float r0, r1, alpha0, alpha1, x0, x1, y0, y1, z0, z1, beta;
        float stackStep = (float) (Math.PI / stack);
        float sliceStep = (float) (Math.PI / slice);
        for (int i = 0; i < stack; ++i) {
            alpha0 = (float) (-Math.PI / 2 + i * stackStep);
            alpha1 = alpha0 + stackStep;
            r0 = (float) (r * Math.cos(alpha0));
            r1 = (float) (r * Math.cos(alpha1));

            y0 = (float) (r * Math.sin(alpha0));
            y1 = (float) (r * Math.sin(alpha1));

            for (int j = 0; j < (slice << 1); ++j) {
                beta = j * sliceStep;//  w ww  .  j  a va 2  s.c o  m
                x0 = (float) (r0 * Math.cos(beta));
                x1 = (float) (r1 * Math.cos(beta));

                z0 = (float) (-r0 * Math.sin(beta));
                z1 = (float) (-r1 * Math.sin(beta));

                coords.add(x0);
                coords.add(y0);
                coords.add(z0);
                coords.add(x1);
                coords.add(y1);
                coords.add(z1);
            }
            gl.glVertexPointer(3, GL10.GL_FLOAT, 0,
                    BufferUtil.list2ByteBuffer(coords));
            gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, coords.size() / 3);
        }
    }
}

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