Question

如何在JavaFX中的AnchorPane中移动图像？图像应该在一段时间内自行移动。到目前为止，我有:(视图是已经在AnchorPane中的ImageView）

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在我的控制器的initialize（）方法中。但是，这不起作用，因为舞台出现时图像已经移动。

Answer 1

这是我根据辅导学生的想法创建的课程。

您应该使用Javafx动画。这按下按钮移动，但如果你想要看到潜水员向右移动，只需从isRightPressed if语句中删除代码并将其放在if语句之外。另外，删除此部分：*（Math.cos（Math.toRadians（rotation）））。

import java.io.File;
import javafx.animation.AnimationTimer;
import javafx.event.EventHandler;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.KeyEvent;

/**
 *
 * @author blj0011
 */
public class Diver {
    File diverFile;
    ImageView ivDiver = new ImageView();
    double rotation = 0.0;

    boolean isUpPressed, isDownPressed, isLeftPressed, isRightPressed;

    Diver()
    {
        diverFile = new File("src/img/diver.png");
        if(diverFile.exists())
        {
            Image diverImage = new Image(diverFile.toURI().toString());
            ivDiver.setImage(diverImage);
        } 

        ivDiver.setFocusTraversable(true);
        ivDiver.setOnKeyPressed(new EventHandler<KeyEvent>()
        {
            @Override
            public void handle(KeyEvent event) {
                switch(event.getCode()) {
                    case UP: isUpPressed = true; break;
                    case DOWN: isDownPressed = true; break;
                    case LEFT: isLeftPressed = true; break;
                    case RIGHT: isRightPressed = true; break;
                }
            }
        });

        ivDiver.setOnKeyReleased(new EventHandler<KeyEvent>()
        {
            @Override
            public void handle(KeyEvent event) {
                switch(event.getCode()) {
                    case UP: isUpPressed = false; break;
                    case DOWN: isDownPressed = false; break;
                    case LEFT: isLeftPressed = false; break;
                    case RIGHT: isRightPressed = false; break;
                }
            }        
        });    

        AnimationTimer timer = new AnimationTimer(){
            @Override
            public void handle(long now) {
                if(isUpPressed){if(rotation == -360){rotation = 0;} ivDiver.setRotate(rotation+=5);}
                if(isDownPressed){if(rotation == 360){rotation = 0;} ivDiver.setRotate(rotation-=5);}
                if(isLeftPressed)
                {                    
                    ivDiver.setX(ivDiver.getX() - 2.0 * (Math.cos(Math.toRadians(rotation))));
                    ivDiver.setY(ivDiver.getY() - 2.0 * (Math.sin(Math.toRadians(rotation))));
                }
                if(isRightPressed)
                {
                    System.out.println("moving diver right!");
                    ivDiver.setX(ivDiver.getX() + 2.0 * (Math.cos(Math.toRadians(rotation))));
                    ivDiver.setY(ivDiver.getY() + 2.0 * (Math.sin(Math.toRadians(rotation))));
                }                    
            }

        };
        timer.start();
    }

    ImageView getDiver()
    {
        return ivDiver;
    }


}

您的代码可能看起来像这样。

AnimationTimer timer = new AnimationTimer(){
    @Override
    public void handle(long now) {
        System.out.println("moving diver right!");
        yourImageView.setX(yourImageView.getX() + 20.0 );
        //yourImageView.setY(yourImageView.getY() + 20.0 );                                      
    }
};
timer.start();

JavaFX移动图像动画

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