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    <p>that example does not work for you because author have not shown piece of code responsible for setting vertexes. </p> <p>Here is my example(it is long, but that's opengl...) NOTE - remember to setUp viewport correctly.</p> <pre><code>public static void drawGradientRectangle(GL10 gl, float centerX, float centerY, float width, float height) { gl.glPushMatrix(); gl.glDisable(GL10.GL_TEXTURE_2D); gl.glEnableClientState(GL10.GL_COLOR_ARRAY); gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); //just in case if you have not done that before gl.glFrontFace(GL10.GL_CCW); //Set the face gl.glTranslatef(centerX, centerY, 0); if (width != 1 || height != 1) { gl.glScalef(width, height, 1); } gl.glVertexPointer(2, GL10.GL_FLOAT, 0, GLDrawConstants.vertexBuffer0_5); gl.glColorPointer(4, GL10.GL_FLOAT, 0, GLDrawConstants.gradOrangeWhiteBuffer); // Draw the vertices as triangle strip gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4); gl.glDisableClientState(GL10.GL_COLOR_ARRAY); gl.glEnable(GL10.GL_TEXTURE_2D); gl.glPopMatrix(); } </code></pre> <p>GLDrawConstants class:</p> <pre><code>public class GLDrawConstants { public static final FloatBuffer gradOrangeWhiteBuffer; public static final FloatBuffer vertexBuffer0_5; private static final float vertices0_5[] = { -0.5f, -0.5f,// Bottom Left 0.5f, -0.5f,// Bottom right -0.5f, 0.5f,// Top Left 0.5f, 0.5f// Top Right }; private static final float gradOrangeWhiteColor[] = { 255/255f, 239/255f, 196/255f, 0f, // Bottom Left 255/255f, 239/255f, 196/255f, 0f, // Bottom right 250/255f, 200/255f, 62/255f, 0.3f, // Top Left 250/255f, 200/255f, 62/255f, 0.3f // Top Right }; static { gradOrangeWhiteBuffer = WDUtils.floatBuffer(gradOrangeWhiteColor); vertexBuffer0_5 = WDUtils.floatBuffer(vertices0_5); } } </code></pre> <p>WDUtils class:</p> <pre><code>public class WDUtils { /** * Make a direct NIO FloatBuffer from an array of floats * * @param arr * The array * @return The newly created FloatBuffer */ public static final FloatBuffer floatBuffer(float[] arr) { ByteBuffer bb = ByteBuffer.allocateDirect(arr.length * 4); bb.order(ByteOrder.nativeOrder()); FloatBuffer fb = bb.asFloatBuffer(); fb.put(arr); fb.position(0); return fb; } } </code></pre> <p><img src="https://i.stack.imgur.com/Vs3CB.png" alt="example on my phone"></p>
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    1. POHow to implement glColorPointer in AndEngine Rectangle class
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    1. POHow to implement glColorPointer in AndEngine Rectangle class
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    1. COHi, thanks for the answer, but are you sure that this will work within AndEngine, because thats my problem with this engine, I've found many examples for doing it in opengl es, but none of them can be move to the specifics of AndEngine. And this is my problem: how to implement it in AndEngine not how to implement it in general.
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    2. COAndEngine uses OpenGL so it should work there with very minor adjustments..have you tried it?
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    3. COI did and it works, thanks, I think that previously I've been calling glColorPointer with a first argument 3 instead of 4 and it usually makes everything balck. Thanks
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