libGDX: User Input
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This document discusses user input handling in libGDX, including event vs polling, touch and keyboard input, accelerometer input, gestures, and text input. It provides code examples for setting up input processors and listeners to handle different types of input in libGDX, including touch, keyboard, accelerometer, and gesture events. It also covers vibration and compass input.
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();