Implementation Prerequisites - Learn OpenGL ES: For Mobile Game and Graphics Development - page 68

Listing 2-16. SENSOR ROTATION/src/com/apress/android/sensorrotation/

Main.java

if (_gravityFiltered >= 6
&& _gravityFiltered <= SensorManager.GRAVITY_EARTH *
1) {
scaling = _SENSITIVITY
+ (2 - (_gravityFiltered /
SensorManager.GRAVITY_EARTH));
_orientationFiltered = _orientationFiltered * (1.0f -
_a)

+ _outR[0] * _a;
float zAngle = scaling * _orientationFiltered * 90;
GLES20Renderer.setZAngle(zAngle);
_textView.setText("Angle: "
+ Float.valueOf(zAngle).toString() + "\n");
_textView.append("Fraction: "
+ Float.valueOf(_orientationFiltered).toString()
+ "\n");
_textView.append("Pitch: "
+ Float.valueOf(_values[1]).toString() + "\n");
_textView
.append("Gravity: "
+ Float.valueOf(_gravityFiltered)
.toString() + "\n");

}

The logic used in the TOUCHROTATION and SENSORROTATION applications for
obtaining inputs is also used in the Tank Fence game to implement the UI. So once
again, go carefully through the class Main and the callback methods from these ap-
plications. This will make you more efficient with UI for applications.

Summary

At the beginning of this chapter I laid down some basic design principles for mobile
game development in order to explain the role of sleek designs for our games. We