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    <p>I am new to <a href="/questions/tagged/android" class="post-tag" title="show questions tagged &#39;android&#39;" rel="tag"><img src="https://i.stack.imgur.com/tKsDb.png" height="16" width="18" alt="" class="sponsor-tag-img">android</a> programming so I am sure there is probably a better way to do this. But I was following the OpenGL ES 1.0 tutorial on the android developers site <a href="http://developer.android.com/resources/tutorials/opengl/opengl-es10.html" rel="nofollow noreferrer">http://developer.android.com/resources/tutorials/opengl/opengl-es10.html</a> which walks you through drawing a green triangle. You can follow the link and you will see most of the code I used there. I wanted to draw a circle on the triangle. The code I added is based on the above example posted by datenwolf. And is shown in snippets below:</p> <pre><code>public class HelloOpenGLES10Renderer implements GLSurfaceView.Renderer { // the number small triangles used to make a circle public int segments = 100; public float mAngle; private FloatBuffer triangleVB; // array to hold the FloatBuffer for the small triangles private FloatBuffer [] segmentsArray = new FloatBuffer[segments]; private void initShapes(){ . . . // stuff to draw holes in the board int i = 0; float angle_start = 0.0f; float angle_stop = 2.0f * (float) java.lang.Math.PI; float angle_step = (angle_stop - angle_start)/segments; for(i=0; i&lt;segments; i++) { float[] holeCoords; FloatBuffer holeVB; holeCoords = new float [ 9 ]; // initialize vertex Buffer for triangle // (# of coordinate values * 4 bytes per float) ByteBuffer vbb2 = ByteBuffer.allocateDirect(holeCoords.length * 4); vbb2.order(ByteOrder.nativeOrder());// use the device hardware's native byte order holeVB = vbb2.asFloatBuffer(); // create a floating point buffer from the ByteBuffer float x1 = 0.05f * (float) java.lang.Math.cos(angle_start + i*angle_step); float y1 = 0.05f * (float) java.lang.Math.sin(angle_start + i*angle_step); float z1 = 0.1f; float x2 = 0.05f * (float) java.lang.Math.cos(angle_start + i+1*angle_step); float y2 = 0.05f * (float) java.lang.Math.sin(angle_start + i+1*angle_step); float z2 = 0.1f; holeCoords[0] = 0.0f; holeCoords[1] = 0.0f; holeCoords[2] = 0.1f; holeCoords[3] = x1; holeCoords[4] = y1; holeCoords[5] = z1; holeCoords[6] = x2; holeCoords[7] = y2; holeCoords[8] = z2; holeVB.put(holeCoords); // add the coordinates to the FloatBuffer holeVB.position(0); // set the buffer to read the first coordinate segmentsArray[i] = holeVB; } } . . . public void onDrawFrame(GL10 gl) { . . . // Draw hole gl.glColor4f( 1.0f - 0.63671875f, 1.0f - 0.76953125f, 1.0f - 0.22265625f, 0.0f); for ( int i=0; i&lt;segments; i++ ) { gl.glVertexPointer(3, GL10.GL_FLOAT, 0, segmentsArray[i]); gl.glDrawArrays(GL10.GL_TRIANGLES, 0, 3); } } </code></pre> <p><img src="https://i.stack.imgur.com/8wGls.png" alt="Here&#39;s a screen shot in the emulator"></p>
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