我刚开始编码了一会儿。我正在尝试使用JPanel
制作一个FruitNinja类型的游戏,我已经完成了所有事情(除了使游戏继续进行的循环以及其余的水果/炸弹动画) )
到目前为止,我只对Apple.png
进行了动画处理(一旦完成此操作,就会动画其他成果)
我正在尝试制作一个checkHit
方法来检查我的鼠标是否越过图像(切片水果),因此需要使用MouseMotionListener
。如果鼠标确实越过水果,我需要它消失/离开框架。
那么如何从MouseMotionListener
中检索坐标,检查它是否在我的水果的40像素范围内,如果是,移动框架的果实?如果可能的话,不仅要这样做,还要在完成后播放声音。
我有另一位用户帮我解决了这个问题,但我仍然无法弄明白。
import javax.swing.*;//imports JPanel class
import java.awt.*;//imports the Graphics class
import java.awt.event.*;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseEvent;
import java.awt.event.ActionListener;
//imports packages needed for the hovering
public class FruitNinja extends JPanel{
private Image dojo;
private Image apple;
private Image orange;
private Image pear;
private Image strawberry;
private Image banana;
private Image bomb;
//declares the import image variables
private javax.swing.Timer timer;
private int dx, dy;
private int vx =40;
//velocity of the object moving in the x direction
private int x=-10;
private int vy=40;
//velocity of the object moving in the y direction
private int y=770;
private int divide=(int)(2*Math.random())+1;//sets random number
//determines when the fruit will bounce off
public FruitNinja() { // a constructor to set up graphics windo
super();
setBackground(Color.WHITE);
loadImage();
dx = 25;
dy = 25;
timer = new javax.swing.Timer( 30, new TimerListener() );
//interval of 10 milliseconds
timer.start();
//timer is a facility for threads to schedule tasks for future execution in a background thread.
}
private void loadImage() {
ImageIcon ii = new ImageIcon("Dojo.jpg");
dojo = ii.getImage();
ImageIcon oo = new ImageIcon("Orange.ico");
orange = oo.getImage();
ImageIcon ss = new ImageIcon("Strawberry.png");
strawberry = ss.getImage();
ImageIcon bb = new ImageIcon("Banana.png");
banana = bb.getImage();
ImageIcon pp = new ImageIcon("Pear.png");
pear = pp.getImage();
ImageIcon aa = new ImageIcon("Apple.png");
apple = aa.getImage();
ImageIcon bo=new ImageIcon("Bomb.png");
bomb=bo.getImage();
//loads neccaseary images for this game
}@Override
public void paintComponent(Graphics g){ // draw graphics in the panel
super.paintComponent(g);// to make panel display correctly
g.drawImage(dojo, 0,0, this);
//draws out dojo
g.drawImage(apple, x,y, this);
g.drawImage(orange, -300,-300, this);
g.drawImage(pear, -300,-300, this);
g.drawImage(banana, -300,-300, this);
g.drawImage(strawberry, -300,-300, this);
//draws out the fruits somewhere
g.drawImage(bomb,-300,-300,this);
//draws out the bomb that will make the player lose
}
private class TimerListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
//implements the ActionListenter
x+=vx; //adds velocity to the x, which makes it travel in x direction
if (x<0){
vx=(-1*vx);
//tells the velocity to change direction
}
y+=vy; //adds velocity to the y, which makes it travel in y direction
if (y>=getHeight()||y<=getHeight()/4){
vy=(-1*vy);
//tells the velocity to change direction
}
repaint(); // causes paintComponent to be called by the JVM
}
}
public static void main(String[] args) {
FruitNinja panel = new FruitNinja(); // window for drawing
JFrame f = new JFrame(); // the program itself
f.setTitle("Fruit Ninja");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//when the X button is clicked, the program quits
f.setSize(1280,800);//size of the frame
Container pane = f.getContentPane();//pane refers to the interior of the JFrame
FruitNinja p1 = new FruitNinja();
pane.add(p1);//add the FacePanel object to the interior of the frame
f.setVisible(true);
}
}
如果我在这里做了什么或/和我如何在其中使用MouseMotionListner
,我请告诉我。我还是很新,所以我不知道如何检索坐标或设置'MouseMotionListener'。如果我的问题不清楚,请随时进入评论,并告知我是否是这种情况;我愿意更彻底地解释这个问题。
由于
修改
这是方法吗?
private class HandleMouse extends MouseAdapter {
//extends MouseAdapter rather than implement Mouse Adapter
public void mousePressed( MouseEvent e ){
Rectangle hitBox = new Rectangle(e.getX() - 20, e.getY() - 20, 40, 40);
Rectangle appleHitBox=new Rectangle(ax-128,ay-128,256,256);
Area area = new Area(hitBox);
area.intersect(new Area(appleHitBox));
if(!area.isEmpty()){
ax=-500;
ay=-500;
avx=0;
avy=0;
}
else{
numOfMisses++;
}
}
}
答案 0 :(得分:1)
那么如何从MouseMotionListener
中检索坐标
MouseMotionListener
将MouseEvent
传递给方法,该方法包含事件的各种属性,其中包括组件坐标上下文中事件的坐标
检查它是否在我的水果的40个像素内,如果它是
所以,这是基本的碰撞检测,有很多可能的方法可以解决这个问题,但是因为我很懒,我可能会考虑用Rectangle
代表用户点击框
Rectangle hitBox = new Rectangle(e.getX() - 20, e.getY() - 20, 40, 40);
这会在MouseEvent
的中心点周围生成一个20像素的框。
&#34;但为什么?&#34;你问?因为Rectangle
有许多可用于碰撞检测的有用方法,包括
intersection
intersects
union
列举一些
因此,考虑到水果的x
/ y
位置和大小,您只需创建第二个Rectangle
并确定第一个是否达到第二个
如果是的话,将水果从框架上移开?
嗯,这将是一个设置标志的过程,其中主要循环&#34; (即你的TimerListener
)告诉它水果已被击中,现在它已经到了主循环#34;将它从&#34; paint&#34;中删除列出并设置下一个对象
如果可能的话,不仅可以这样做,还可以在完成后播放声音
作为一般答案,是。一旦你能够发现碰撞已经发生,播放声音相对简单,我再次试图使用&#34;主循环&#34;当它检测到命中已经发生时,也可以这样做