opengl draw Hoop - Java javax.media.opengl

Java examples for javax.media.opengl:Draw

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Description

opengl draw Hoop

Demo Code


import java.awt.Color;
import javax.media.opengl.GL;
import javax.vecmath.Point3d;

public class Main{
    public static void drawHoop(GL gl, double hoopRadius, double tubeRadius) {

        int segmentsA = 100;
        int segmentsB = 100;

        for (int i = 50; i <= segmentsA; i++) {
            double angleA1 = 2 * Math.PI
                    * (-0.5 + (double) (i - 1) / segmentsA);
            double x0 = Math.sin(angleA1) * hoopRadius;
            double y0 = Math.cos(angleA1) * hoopRadius;

            double angleA2 = 2 * Math.PI * (-0.5 + (double) i / segmentsA);
            double x1 = Math.sin(angleA2) * hoopRadius;
            double y1 = Math.cos(angleA2) * hoopRadius;

            gl.glBegin(GL.GL_QUAD_STRIP);
            for (int j = 0; j <= segmentsB; j++) {
                double angleB = 2 * Math.PI * (double) (j - 1) / segmentsB;
                double x = Math.cos(angleB) * tubeRadius;
                double y = Math.sin(angleB) * tubeRadius;

                gl.glNormal3d(x0 + x, y0, y0 * y);
                gl.glVertex3d(x0 + x, y0, y0 * y);
                gl.glNormal3d(x1 + x, y1, y1 * y);
                gl.glVertex3d(x1 + x, y1, y1 * y);
            }/*from  ww w  .  j a v  a2  s .  c  o  m*/
            gl.glEnd();
        }
    }
}

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