StackOverflow2013

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copied!<p>I get normalized screen coordinates through the following.</p> <pre><code>glSurfaceView.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { if (event != null) { // Convert touch coordinates into normalized device // coordinates, keeping in mind that Android's Y // coordinates are inverted. final float normalizedX = (event.getX() / (float) v.getWidth()) * 2 - 1; //final float normalizedY = -((event.getY() / (float) v.getHeight()) * 2 - 1);//commented to kill z axis //final float normalizedY; final float scrnx =event.getX(); final float scrny =event.getY(); if (event.getAction() == MotionEvent.ACTION_DOWN) { normalizedY = -((event.getY() / (float) v.getHeight()) * 2 - 1); glSurfaceView.queueEvent(new Runnable() { @Override public void run() { airHockeyRenderer.handleTouchPress( normalizedX, normalizedY); } }); } else if (event.getAction() == MotionEvent.ACTION_MOVE) { normalizedY = -((event.getY() / (float) v.getHeight()) * 2 - 1); glSurfaceView.queueEvent(new Runnable() { @Override public void run() { airHockeyRenderer.handleTouchDrag( normalizedX, normalizedY, scrnx, scrny); } }); } return true; } else { return false; } } }); </code></pre> <p>After translating the parent object, I use the x and z vertices of my parent circle which is laying flat on the z plane.</p> <pre><code>circPosition1.x = rcircle.vertexArray.rawFloatbuff[3*circcnter]; circPosition1.z = rcircle.vertexArray.rawFloatbuff[(3*circcnter)+2]; </code></pre> <p>'rcircle' is the parent object. </p> <p>'circcnter' is the position on the curve, or in this case circle.</p> <p>'circPosition1' is the child object which will be located to the edge of the parent object.</p>

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