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libGDX: User Input
- 1. libGDX: User Input Jussi Pohjolainen Tampere University of Applied Sciences
- 3. Event vs Polling • Polling – Do something on each frame, really fast – Was mouse clicked? Was mouse clicked? Was mouse clicked? – Good for arcade games • Event – Do something when event handles – NoIfy when mouse was clicked – UI elements such as buJons • Mouse / touch / keyboard can be received either polling or event handling
- 4. public class MyInputProcessor implements InputProcessor { @Override public boolean keyDown (int keycode) { return false; } @Override public boolean keyUp (int keycode) { return false; } @Override public boolean keyTyped (char character) { return false; } @Override public boolean touchDown (int x, int y, int pointer, int button) { return false; } @Override public boolean touchUp (int x, int y, int pointer, int button) { return false; } @Override public boolean touchDragged (int x, int y, int pointer) { return false; } @Override public boolean mouseMoved (int x, int y) { return false; } @Override public boolean scrolled (int amount) { return false; } } MyInputProcessor inputProcessor = new MyInputProcessor(); Gdx.input.setInputProcessor(inputProcessor);
- 5. Polling Touch / Keyboard • For most arcade games, polling is good • MulItouch is supported! – boolean firstFingerTouching = Gdx.input.isTouched(0); – boolean secondFingerTouching = Gdx.input.isTouched(1); – int firstX = Gdx.input.getX(); – int firstY = Gdx.input.getY(); – int secondX = Gdx.input.getX(1); – int secondY = Gdx.input.getY(1); • Keyboard – boolean isAPressed = Gdx.input.isKeyPressed(Keys.A);
- 7. Accelerometer • An accelerometer measures the acceleraIon of a device on three axes • From this acceleraIon one can derive the Ilt or orientaIon of the device. – Phones: portrait default – Tablet: landscape default • LibGDX shows accelerometer readings always as in the image
- 8. Accelerometer y (0,0) Accelerometer x y increments x increments
- 9. Accelerometer Readings • Accelerometer readings can be accessed – float accelX = Gdx.input.getAccelerometerX(); – float accelY = Gdx.input.getAccelerometerY(); – float accelZ = Gdx.input.getAccelerometerZ(); • When moving and if in landscape mode in android, noIce X vs Y! – speedX += Gdx.input.getAccelerometerY();
- 10. GESTURES
- 11. GestureDetector • TouchDown • LongPress • Tap • Pan – Useful for camera panning in 2D • PanStop • Fling • Zoom – Camera zooming • Pinch – Camera zooming + rotaIon
- 12. StarIng to Listen to Gestures • Really easy – Gdx.input.setInputProcessor(new GestureDetector(new MyGestureListener())); • MyGestureListener is some class that implements GestureListener
- 13. public class MyGestureListener implements GestureListener { @Override public boolean touchDown(float x, float y, int pointer, int button) {} @Override public boolean tap(float x, float y, int count, int button) {} @Override public boolean longPress(float x, float y) {} @Override public boolean fling(float velocityX, float velocityY, int button) {} @Override public boolean pan(float x, float y, float deltaX, float deltaY) {} @Override public boolean panStop(float x, float y, int pointer, int button) {} @Override public boolean zoom (float originalDistance, float currentDistance){} @Override public boolean pinch (Vector2 initialFirstPointer, Vector2 initialSecondPointer, Vector2 firstPointer, Vector2 secondPointer){} }
- 15. User input • Desktop – Swing dialog • Android – Android dialog • Use TextInputListener – MyTextInputListener listener = new MyTextInputListener(); – Gdx.input.getTextInput(listener, "Dialog Title", "Initial Textfield Value")
- 16. public class MyTextInputListener implements TextInputListener { @Override public void input (String text) { } @Override public void canceled () { } }
- 17. MISC
- 18. • Vibra – Gdx.input.vibrate(2000); – Remember to add permissions • Compass – float azimuth = Gdx.input.getAzimuth(); – float pitch = Gdx.input.getPitch(); – float roll = Gdx.input.getRoll();