Created
January 8, 2014 18:25
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JavaFX sample to move a character around a field based on key controls.
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import javafx.animation.AnimationTimer; | |
import javafx.application.Application; | |
import javafx.event.EventHandler; | |
import javafx.scene.*; | |
import javafx.scene.image.*; | |
import javafx.scene.input.KeyEvent; | |
import javafx.scene.paint.Color; | |
import javafx.stage.Stage; | |
/** | |
* Hold down an arrow key to have your hero move around the screen. | |
* Hold down the shift key to have the hero run. | |
*/ | |
public class CharacterMovement extends Application { | |
private static final double W = 600, H = 400; | |
private static final String HERO_IMAGE_LOC = | |
"http://icons.iconarchive.com/icons/raindropmemory/legendora/64/Hero-icon.png"; | |
private Image heroImage; | |
private Node hero; | |
boolean running, goNorth, goSouth, goEast, goWest; | |
@Override | |
public void start(Stage stage) throws Exception { | |
heroImage = new Image(HERO_IMAGE_LOC); | |
hero = new ImageView(heroImage); | |
Group dungeon = new Group(hero); | |
moveHeroTo(W / 2, H / 2); | |
Scene scene = new Scene(dungeon, W, H, Color.FORESTGREEN); | |
scene.setOnKeyPressed(new EventHandler<KeyEvent>() { | |
@Override | |
public void handle(KeyEvent event) { | |
switch (event.getCode()) { | |
case UP: goNorth = true; break; | |
case DOWN: goSouth = true; break; | |
case LEFT: goWest = true; break; | |
case RIGHT: goEast = true; break; | |
case SHIFT: running = true; break; | |
} | |
} | |
}); | |
scene.setOnKeyReleased(new EventHandler<KeyEvent>() { | |
@Override | |
public void handle(KeyEvent event) { | |
switch (event.getCode()) { | |
case UP: goNorth = false; break; | |
case DOWN: goSouth = false; break; | |
case LEFT: goWest = false; break; | |
case RIGHT: goEast = false; break; | |
case SHIFT: running = false; break; | |
} | |
} | |
}); | |
stage.setScene(scene); | |
stage.show(); | |
AnimationTimer timer = new AnimationTimer() { | |
@Override | |
public void handle(long now) { | |
int dx = 0, dy = 0; | |
if (goNorth) dy -= 1; | |
if (goSouth) dy += 1; | |
if (goEast) dx += 1; | |
if (goWest) dx -= 1; | |
if (running) { dx *= 3; dy *= 3; } | |
moveHeroBy(dx, dy); | |
} | |
}; | |
timer.start(); | |
} | |
private void moveHeroBy(int dx, int dy) { | |
if (dx == 0 && dy == 0) return; | |
final double cx = hero.getBoundsInLocal().getWidth() / 2; | |
final double cy = hero.getBoundsInLocal().getHeight() / 2; | |
double x = cx + hero.getLayoutX() + dx; | |
double y = cy + hero.getLayoutY() + dy; | |
moveHeroTo(x, y); | |
} | |
private void moveHeroTo(double x, double y) { | |
final double cx = hero.getBoundsInLocal().getWidth() / 2; | |
final double cy = hero.getBoundsInLocal().getHeight() / 2; | |
if (x - cx >= 0 && | |
x + cx <= W && | |
y - cy >= 0 && | |
y + cy <= H) { | |
hero.relocate(x - cx, y - cy); | |
} | |
} | |
public static void main(String[] args) { launch(args); } | |
} |
thank you so much!!! this solves my nightmare!!
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Answer to JavaRanch JavaFX forum question on JavaFX Key Controls.