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POKinect Cursor Control with virtual XNA-Rectangle-'Touchpad' - Y-Axis inverted
 

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    <p>I'm trying to implement a Real-Time Strategy control scheme for the MS Kinect. So far, I've got a cursor, which can be moved by moving your left Hand (or right, dependant on your handedness). I've got an Open-NI-based Kinect controller which sets up a skeleton for player-movements and delivers the wrist-, elbow-, shoulder- and body-center-coordinates to my application. To project these wrist-coordinates to the screen, I've set up a Rectangle, which is situated slightly left/right from the player's center and as long as the wrist moves inside the rectangle, the cursor moves on screen. My problem is, that the XNA-Rectangle has the upper left corner as point of origin, i.e. the X-axis points right, as it "should", but the Y-axis points down, while the Y-axis of the Kinect - coordinate system points up. This results in the cursor moving upwards on screen, when I move my hand down and vice versa. There's no way for me to change anything with the Kinect-coordinate system, so is it possible to 'flip' the 'coordinate system' of the rectangle, so that it's Y-axis points up,too? </p> <p>Here's the relevant code:</p> <p>(from Calibrate()-Method:)</p> <pre><code>List&lt;Vector3&gt; joints = UDPlistener.getInstance().ParseCalibCoordinates(data); //0 = Right Wrist 1 = Right Elbow 2 = Right Shoulder //3 = Left Wrist 4 = Left Elbow 5 = Left Shoulder //6 = Center height = 762; width = 1024; switch (hand) { case 0: cursorSpace = new Rectangle((int)(joints[6].X * 2) - 200, (int)(joints[6].Y * 2) + height, width, height); break; case 3: cursorSpace = new Rectangle((int)(joints[6].X * 2) - 1200, (int)(joints[6].Y * 2) + height, width, height); break; } public Point Cursor(String data) { List&lt;Vector3&gt; joints = UDPlistener.getInstance().ParsePlayCoordinates(data); //0 = Right Wrist 1 = Left Wrist 2 = Center double mhx = 0; //main hand x-coordinate double mhy = 0; // main hand y-coordinate switch (hand) { case 0: mhx = joints[hand].X; mhy = joints[hand].Y; break; case 3: mhx = joints[hand-2].X; mhy = joints[hand-2].Y; break; } int x; int y; if (Math.Abs(mhx - mhxOld) &lt; 1.0 || Math.Abs(mhy - mhyOld) &lt; 1.0) //To remove jittering of the cursor { x = (int) mhxOld * 2; y = (int) mhyOld * 2; } else { x = (int) mhx * 2; mhxOld = mhx; y = (int) mhy * 2; mhyOld = mhy; } Point cursor = new Point(0,0); if (cursorSpace.Contains(x,y)) { cursor = new Point(x - cursorSpace.X, y - CursorSpace.Y); lastCursorPos = cursor; return cursor; } </code></pre> <p>Sorry for the wall of text, I hope, I could make myself clear.</p> <p>Thanks in advance,</p> <p>KK</p>
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