FXMarsDuke.java

/*
 * FXMarsDuke.java
 * 
 * This JavaFX example application loads an image file
 * and displays it as rotating cube.
 * 
 * If the image file is missing, download 2P137011382EFF4000P2563L5M1
 * from https://areo.info/mer/spirit/120 and save it as marsduke.png.
 *
 * Author: Holger Isenberg
 * Date: 2023-06-21
 * No copyright claimed, free for any use.
 * 
 * To run it on JavaFX 17:
 * javac FXMarsDuke.java
 * java FXMarsDuke
 *
 * Or to build the integrated Mac .app bundle which will include the JRE: ./fxmakeitso.sh
 *
 * JavaFX 17 is available for example from https://foojay.io/download when enabling
 * the checkmark "Include JavaFX" below Options in the navigation.
 * 
 */

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.geometry.Rectangle2D;
import javafx.scene.Group;
import javafx.scene.PerspectiveCamera;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.input.MouseEvent;
import javafx.scene.input.ScrollEvent;
import javafx.scene.paint.Color;
import javafx.scene.paint.CycleMethod;
import javafx.scene.paint.PhongMaterial;
import javafx.scene.paint.RadialGradient;
import javafx.scene.paint.Stop;
import javafx.scene.shape.Box;
import javafx.scene.transform.Rotate;
import javafx.scene.transform.Translate;
import javafx.stage.Screen;
import javafx.stage.Stage;

public class FXMarsDuke extends Application {
	static private String imgfilename = "marsduke.png";
	static private Image texture;

	public static void main(String[] args) throws IOException, InterruptedException {
		InputStream imgStream;
		if(args.length == 0) {
			String appDir = FXMarsDuke.class.getProtectionDomain().getCodeSource().getLocation().getPath();
			if (appDir.endsWith(".jar")) {
				appDir = new File(appDir).getParent();
			}
			imgStream = new FileInputStream(new File(appDir, imgfilename));
		} else {
			imgfilename = args[0];
			imgStream = new FileInputStream(imgfilename);
		}
		texture = new Image(imgStream);
		System.out.print("Loading image " + imgfilename + "...");
		while(texture.getWidth() == 0) { 
			System.out.print(".");
			Thread.sleep(1000);
		}
		System.out.println();
		System.out.println("  Mars Exploration Rover Spirit, Pancam, sol 120, May 5, 2004\n"
				+ "  ID 2P137011382EFF4000P2563L5M1\n"
				+ "  https://areo.info/mer/spirit/120\n"
				+ "  https://mars.nasa.gov/mer/gallery/all/spirit_p120.html\n");
		System.out.println("Press and move mouse to rotate cube,\n"
				+ "or use keys: " + KeyCode.UP + ", " + KeyCode.DOWN
				+ ", " + KeyCode.LEFT + ", " + KeyCode.RIGHT
				+ ", " + KeyCode.MINUS + ", " + KeyCode.PLUS
				+ "\nPress " + KeyCode.Q + " or " + KeyCode.ESCAPE + " to exit.");
		launch(args);
	}

	public void start(Stage stage) {
		stage.setTitle("FXMarsDuke");

		PhongMaterial texturedMaterial = new PhongMaterial();
		texturedMaterial.setDiffuseMap(texture);

		Box cube = new Box();
		cube.setWidth(texture.getWidth()); 
		cube.setHeight(texture.getWidth());
		cube.setDepth(texture.getWidth());
		cube.setMaterial(texturedMaterial);

		Group rootGroup = new Group();
		Rectangle2D screenBounds = Screen.getPrimary().getBounds();
		double viewSize = Math.min(screenBounds.getWidth(), screenBounds.getHeight())*2/3;
		viewSize = Math.min(viewSize, cube.getWidth());
		Scene scene = new Scene(rootGroup, viewSize, viewSize, true);
		scene.setFill(new RadialGradient(270, 0.75,
				scene.getWidth()/2, scene.getHeight()/2, 1.5*scene.getHeight(), false,
				CycleMethod.NO_CYCLE, new Stop[]{
						new Stop(0f, Color.BLUE),
						new Stop(1f, Color.LIGHTBLUE)
		}));
		PerspectiveCamera camera = new PerspectiveCamera();
		scene.setCamera(camera);
		scene.setOnScroll((ScrollEvent e) -> {
			camera.setTranslateZ(camera.getTranslateZ() + e.getDeltaY());
		});

		cube.getTransforms().add(new Translate(scene.getWidth()/2, scene.getHeight()/2, 0));
		rootGroup.getChildren().addAll(cube);

		EventHandler<MouseEvent> mouseHandler =	new EventHandler<MouseEvent>() {
			private double oldX, oldY, olddx, olddy;
			public void handle(MouseEvent mouseEvent) {
				if(mouseEvent.getEventType() == MouseEvent.MOUSE_PRESSED) {
					oldX = mouseEvent.getSceneX();
					oldY = mouseEvent.getSceneY();
					olddx = 0;
					olddy = 0;
				}
				if(mouseEvent.getEventType() == MouseEvent.MOUSE_DRAGGED) {
					double dx, dy;
					if (olddx == 0 && olddy == 0) {
						dx = mouseEvent.getSceneX() - oldX;
						dy = mouseEvent.getSceneY() - oldY;
					} else {
						dx = mouseEvent.getSceneX() - olddx;
						dy = mouseEvent.getSceneY() - olddy;
						olddx = dx;
						olddy = dy;
					}
					cube.getTransforms().add(new Rotate(-dx/(scene.getWidth()/2), 0, 0, 0, Rotate.Y_AXIS));
					cube.getTransforms().add(new Rotate(dy/(scene.getHeight()/2), 0, 0, 0, Rotate.X_AXIS));
				}
			}};
			EventHandler<KeyEvent> keyHandler =	new EventHandler<KeyEvent>() {
				public void handle(KeyEvent keyEvent) {
					if(keyEvent.getEventType() == KeyEvent.KEY_PRESSED) {
						double dw = scene.getWidth()/100; 
						double dz = scene.getHeight()/10;
						if(keyEvent.getCode() == KeyCode.PLUS || keyEvent.getCode() == KeyCode.EQUALS) {
							cube.getTransforms().add(new Translate(0, 0, -dz));
						} else if(keyEvent.getCode() == KeyCode.MINUS) {
							cube.getTransforms().add(new Translate(0, 0, dz));
						} else if(keyEvent.getCode() == KeyCode.UP) {
							cube.getTransforms().add(new Rotate(-dw, 0, 0, 0, Rotate.X_AXIS));
						} else if(keyEvent.getCode() == KeyCode.DOWN) {
							cube.getTransforms().add(new Rotate(dw, 0, 0, 0, Rotate.X_AXIS));
						} else if(keyEvent.getCode() == KeyCode.LEFT) {
							cube.getTransforms().add(new Rotate(dw, 0, 0, 0, Rotate.Y_AXIS));
						} else if(keyEvent.getCode() == KeyCode.RIGHT) {
							cube.getTransforms().add(new Rotate(-dw, 0, 0, 0, Rotate.Y_AXIS));
						} else if(keyEvent.getCode() == KeyCode.Q || keyEvent.getCode() == KeyCode.ESCAPE) {
							stage.close();
						}
					}
				}};
				scene.setOnMousePressed(mouseHandler);
				scene.setOnMouseDragged(mouseHandler);
				scene.setOnKeyPressed(keyHandler);
				stage.setScene(scene);
				stage.show();
	}
}