Java 秋千中的球动画
问题是当我调整Java 秋千中的球动画,java,swing,resize,paintcomponent,jcomponent,Java,Swing,Resize,Paintcomponent,Jcomponent,问题是当我调整JFrame的大小时，动画会继续使用它为JComponent预先提供的维度。当我调整JFrame的大小时，是否有一种方法可以更新我的宽度和高度变量，以便动画可以与新坐标一起运行 更简单地说，假设JComponent具有初始width=300和height=300，因此BALL在这些指定的坐标内移动。现在，如果我调整我的JFrame，那么JComponent的大小仍然保持不变，即width=300和height=300，但我希望的是，能够用窗口的当前大小修改这些变量。如果我在解释我的
JFrameJComponentJFrame宽度高度JComponentwidth=300height=300BALL坐标内移动。现在，如果我调整我的JFrame
，那么JComponent
的大小仍然保持不变，即width=300
和height=300
，但我希望的是，能够用窗口的当前大小修改这些变量。如果我在解释我的问题时缺少一些东西，一定要让我知道
以下是我正在使用的代码：
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class BallAnimation
{
private int x;
private int y;
private int count;
private int width;
private int height;
private int speedValue;
private boolean flag;
/*
* These variables are used to keep track of
* the ball, either it is going LEFT or RIGHT
* depending on that, we will set the
* Co-ordinates.
*/
private boolean toLeft, toRight;
private boolean fromTop, fromBottom;
private Timer timer;
private JButton button;
private ActionListener actionTimer;
private ActionListener buttonAction;
public BallAnimation()
{
x = y = count = 0;
flag = toLeft = false;
toRight = true;
fromTop = true;
fromBottom = false;
speedValue = 5;
}
public static void main(String args[])
{
Runnable runnable = new Runnable()
{
public void run()
{
BallAnimation animation = new BallAnimation();
animation.go();
}
};
SwingUtilities.invokeLater(runnable);
}
public void go()
{
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//JPanel contentPane = new JPanel();
/*
* Class Name :
* Java Naming Convention says that class names
* should be in Pascal Case, i.e. the first
* letter of the class name should be capitalized
* and every new word must start with a capitalized
* Alphabet.
* For Example :
* public class ClassName{...}
* ----------------------------------------------------------
* Variable Name :
* Java Naming Convention says that the variable name
* should be in Camel Case, i.e. the first letter of
* the variable name should be small case or _ (underscore)
* and every new word must start with a capitalized
* Alphabet.
* ---------------------------------------------------------
*/
final MyDraw drawPanel = new MyDraw(0, 0);
x = drawPanel.getXValue();
y = drawPanel.getYValue();
//contentPane.add(drawPanel);
actionTimer = new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
if (fromTop && !fromBottom && x < width && y < height
&& toRight && !toLeft)
{
x += speedValue;
y += speedValue;
}
else if (fromTop && !fromBottom && x < width && y >= height
&& toRight && !toLeft)
{
/*
* Since the ball coming from the TOP LEFT Side
* touched the BOTTOM of the JPanel.
*/
y -= speedValue;
x += speedValue;
fromTop = false;
fromBottom = true;
}
else if (!fromTop && fromBottom && x < width && y <= 0
&& toRight && !toLeft)
{
/*
* Since the ball coming from BOTTOM LEFT Side
* touched the TOP of the JPanel.
*/
fromTop = true;
fromBottom = false;
x += speedValue;
y += speedValue;
}
else if (!fromTop && fromBottom && x < width && y < height
&& toRight && !toLeft)
{
x += speedValue;
y -= speedValue;
}
else if (!fromTop && fromBottom && x >= width && y < height
&& toRight && !toLeft)
{
/*
* Since the ball coming from the BOTTOM LEFT Side
* touched the RIGHT Side of the JPanel.
*/
toRight = false;
toLeft = true;
x -= speedValue;
y -= speedValue;
}
else if (!fromTop && fromBottom && x < width && y <= 0
&& !toRight && toLeft)
{
/*
* Since the ball coming from the BOTTOM RIGHT Side
* touched the Top Side of the JPanel.
*/
fromTop = true;
fromBottom = false;
x -= speedValue;
y += speedValue;
}
else if (fromTop && !fromBottom && x <= 0 && y < height
&& !toRight && toLeft)
{
/*
* Since the ball coming from the TOP RIGHT Side
* touched the LEFT Side of the JPanel.
*/
toRight = true;
toLeft = false;
x += speedValue;
y += speedValue;
}
else if (fromTop && !fromBottom && x >= width && y < height
&& toRight && !toLeft)
{
/*
* Since the ball coming from the TOP LEFT Side
* touched the RIGHT Side of the JPanel
*/
toRight = false;
toLeft = true;
x -= speedValue;
y += speedValue;
}
else if (fromTop && !fromBottom && x < width && y < height
&& !toRight && toLeft)
{
x -= speedValue;
y += speedValue;
}
else if (!fromTop && fromBottom && x <= 0 && y < height
&& !toRight && toLeft)
{
/*
* Since the ball coming from the BOTTOM RIGHT Side
* touched the LEFT Side of the JPanel.
*/
toRight = true;
toLeft = false;
x += speedValue;
y -= speedValue;
}
else if (!fromTop && fromBottom && x < width && y < height
&& !toRight && toLeft)
{
x -= speedValue;
y -= speedValue;
}
else if (fromTop && !fromBottom && x < width && y >= height
&& !toRight && toLeft)
{
/*
* Since the ball coming from the TOP RIGHT Side
* touched the BOTTOM Side of the JPanel.
*/
fromTop = false;
fromBottom = true;
x -= speedValue;
y -= speedValue;
}
System.out.println("X : " + x);
System.out.println("Y : " + y);
System.out.println("Direction is LEFT : " + toLeft);
System.out.println("Direction is RIGHT : " + toRight);
System.out.println("Coming from TOP : " + fromTop);
System.out.println("Coming from BOTTOM : " + fromBottom);
drawPanel.setXYValues(x, y);
}
};
buttonAction = new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
if (!flag)
{
timer.start();
button.setText("STOP ANIMATION");
flag = true;
}
else if (flag)
{
timer.stop();
button.setText("START ANIMATION");
flag = false;
}
}
};
button = new JButton("START ANIMATION");
button.addActionListener(buttonAction);
frame.getContentPane().add(drawPanel, BorderLayout.CENTER);
frame.getContentPane().add(button, BorderLayout.PAGE_END);
frame.setSize(300, 300);
//frame.pack();
frame.setVisible(true);
timer = new Timer(40, actionTimer);
width = drawPanel.getWidth() - 30;
System.out.println("WIDTH : " + width);
height = drawPanel.getHeight() - 30;
System.out.println("HEIGHT : " + height);
}
class MyDraw extends JComponent
{
private int x;
private int y;
private Timer timer;
public MyDraw(int x, int y)
{
this.x = x;
this.y = y;
}
public int getXValue()
{
return x;
}
public int getYValue()
{
return y;
}
public void setXYValues(int x, int y)
{
this.x = x;
this.y = y;
repaint();
}
public Dimension getPreferredSize()
{
return (new Dimension(300, 300));
}
public void paintComponent(Graphics g)
{
g.setColor(Color.WHITE);
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(Color.BLUE);
g.fillOval(x, y, 40, 40);
}
}
}
import javax.swing.*；
导入java.awt.*；
导入java.awt.event.*；
公共课叙事
{
私人INTX；
私营企业；
私人整数计数；
私有整数宽度；
私人内部高度；
私人价值；
私有布尔标志；
/*
*这些变量用于跟踪
*球要么向左，要么向右
*根据这一点，我们将设置
*坐标。
*/
私有布尔toLeft，toRight；
自上而下的私有布尔值；
私人定时器；
私人按钮；
私有ActionListener actionTimer；
私人动作监听按钮；
公共民谣（）
{
x=y=count=0；
flag=toLeft=false；
toRight=正确；
fromTop=true；
fromBottom=false；
速度值=5；
}
公共静态void main（字符串参数[]）
{
Runnable Runnable=新的Runnable（）
{
公开募捐
{
BallAnimation动画=新的BallAnimation（）；
动画。go（）；
}
};
SwingUtilities.invokeLater（可运行）；
}
公开作废go（）
{
JFrame=新JFrame（）；
frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）；
//JPanel contentPane=新的JPanel（）；
/*
*类名：
*Java命名约定说类名
*应在Pascal情况下，即第一个
*类名的字母应该大写
*每个新词都必须以大写字母开头
*字母表。
*例如：
*公共类类名{…}
* ----------------------------------------------------------
*变量名：
*Java命名约定表示变量名
*应为驼色字母，即字母的第一个字母
*变量名应为小写或ux（下划线）
*每个新词都必须以大写字母开头
*字母表。
* ---------------------------------------------------------
*/
最终MyDraw drawPanel=新的MyDraw（0,0）；
x=drawPanel.getXValue（）；
y=drawPanel.getYValue（）；
//contentPane.add（drawPanel）；
actionTimer=新建ActionListener（）
{
已执行的公共无效行动（行动事件ae）
{
如果（从上到下）&&x<宽度和y<高度
&&toRight&！toLeft）
{
x+=速度值；
y+=速度值；
}
否则，如果（从顶部开始&&！从底部开始&&x<宽度&&y>=高度
&&toRight&！toLeft）
{
/*
*因为球从左上方传来
*触到了JPanel的底部。
*/
y-=速度值；
x+=速度值；
fromTop=false；
fromBottom=true；
}
如果（！fromTop&&fromtown&&xWindowEventListener
？）绑定到JFrame，以便在窗口尺寸更改时更新width
和height
。现在这是一个完整的代码帮助！试试这个变体（打断一两件事，但解决了主要问题）。解决方法是根据组件的当前大小确定宽度/高度
package test;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class BallAnimation
{
private int x;
private int y;
private int count;
//private int drawPanel.getWidth();
//private int drawPanel.getHeight();
private int speedValue;
private boolean flag;
/*
* These variables are used to keep track of
* the ball, either it is going LEFT or RIGHT
* depending on that, we will set the
* Co-ordinates.
*/
private boolean toLeft, toRight;
private boolean fromTop, fromBottom;
private Timer timer;
private JButton button;
private ActionListener actionTimer;
private ActionListener buttonAction;
MyDraw drawPanel;
public BallAnimation()
{
x = y = count = 0;
flag = toLeft = false;
toRight = true;
fromTop = true;
fromBottom = false;
speedValue = 5;
}
public static void main(String args[])
{
Runnable runnable = new Runnable()
{
public void run()
{
BallAnimation animation = new BallAnimation();
animation.go();
}
};
SwingUtilities.invokeLater(runnable);
}
public void go()
{
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//JPanel contentPane = new JPanel();
/*
* Class Name :
* Java Naming Convention says that class names
* should be in Pascal Case, i.e. the first
* letter of the class name should be capitalized
* and every new word must start with a capitalized
* Alphabet.
* For Example :
* public class ClassName{...}
* ----------------------------------------------------------
* Variable Name :
* Java Naming Convention says that the variable name
* should be in Camel Case, i.e. the first letter of
* the variable name should be small case or _ (underscore)
* and every new word must start with a capitalized
* Alphabet.
* ---------------------------------------------------------
*/
drawPanel = new MyDraw(0, 0);
x = drawPanel.getXValue();
y = drawPanel.getYValue();
//contentPane.add(drawPanel);
actionTimer = new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
if (fromTop && !fromBottom && x < drawPanel.getWidth() && y < drawPanel.getHeight()
&& toRight && !toLeft)
{
x += speedValue;
y += speedValue;
}
else if (fromTop && !fromBottom && x < drawPanel.getWidth() && y >= drawPanel.getHeight()
&& toRight && !toLeft)
{
/*
* Since the ball coming from the TOP LEFT Side
* touched the BOTTOM of the JPanel.
*/
y -= speedValue;
x += speedValue;
fromTop = false;
fromBottom = true;
}
else if (!fromTop && fromBottom && x < drawPanel.getWidth() && y <= 0
&& toRight && !toLeft)
{
/*
* Since the ball coming from BOTTOM LEFT Side
* touched the TOP of the JPanel.
*/
fromTop = true;
fromBottom = false;
x += speedValue;
y += speedValue;
}
else if (!fromTop && fromBottom && x < drawPanel.getWidth() && y < drawPanel.getHeight()
&& toRight && !toLeft)
{
x += speedValue;
y -= speedValue;
}
else if (!fromTop && fromBottom && x >= drawPanel.getWidth() && y < drawPanel.getHeight()
&& toRight && !toLeft)
{
/*
* Since the ball coming from the BOTTOM LEFT Side
* touched the RIGHT Side of the JPanel.
*/
toRight = false;
toLeft = true;
x -= speedValue;
y -= speedValue;
}
else if (!fromTop && fromBottom && x < drawPanel.getWidth() && y <= 0
&& !toRight && toLeft)
{
/*
* Since the ball coming from the BOTTOM RIGHT Side
* touched the Top Side of the JPanel.
*/
fromTop = true;
fromBottom = false;
x -= speedValue;
y += speedValue;
}
else if (fromTop && !fromBottom && x <= 0 && y < drawPanel.getHeight()
&& !toRight && toLeft)
{
/*
* Since the ball coming from the TOP RIGHT Side
* touched the LEFT Side of the JPanel.
*/
toRight = true;
toLeft = false;
x += speedValue;
y += speedValue;
}
else if (fromTop && !fromBottom && x >= drawPanel.getWidth() && y < drawPanel.getHeight()
&& toRight && !toLeft)
{
/*
* Since the ball coming from the TOP LEFT Side
* touched the RIGHT Side of the JPanel
*/
toRight = false;
toLeft = true;
x -= speedValue;
y += speedValue;
}
else if (fromTop && !fromBottom && x < drawPanel.getWidth() && y < drawPanel.getHeight()
&& !toRight && toLeft)
{
x -= speedValue;
y += speedValue;
}
else if (!fromTop && fromBottom && x <= 0 && y < drawPanel.getHeight()
&& !toRight && toLeft)
{
/*
* Since the ball coming from the BOTTOM RIGHT Side
* touched the LEFT Side of the JPanel.
*/
toRight = true;
toLeft = false;
x += speedValue;
y -= speedValue;
}
else if (!fromTop && fromBottom && x < drawPanel.getWidth() && y < drawPanel.getHeight()
&& !toRight && toLeft)
{
x -= speedValue;
y -= speedValue;
}
else if (fromTop && !fromBottom && x < drawPanel.getWidth() && y >= drawPanel.getHeight()
&& !toRight && toLeft)
{
/*
* Since the ball coming from the TOP RIGHT Side
* touched the BOTTOM Side of the JPanel.
*/
fromTop = false;
fromBottom = true;
x -= speedValue;
y -= speedValue;
}
System.out.println("X : " + x);
System.out.println("Y : " + y);
System.out.println("Direction is LEFT : " + toLeft);
System.out.println("Direction is RIGHT : " + toRight);
System.out.println("Coming from TOP : " + fromTop);
System.out.println("Coming from BOTTOM : " + fromBottom);
drawPanel.setXYValues(x, y);
}
};
buttonAction = new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
if (!flag)
{
timer.start();
button.setText("STOP ANIMATION");
flag = true;
}
else if (flag)
{
timer.stop();
button.setText("START ANIMATION");
flag = false;
}
}
};
button = new JButton("START ANIMATION");
button.addActionListener(buttonAction);
frame.getContentPane().add(drawPanel, BorderLayout.CENTER);
frame.getContentPane().add(button, BorderLayout.PAGE_END);
frame.setSize(300, 300);
//frame.pack();
frame.setVisible(true);
timer = new Timer(40, actionTimer);
System.out.println("WIDTH : " + drawPanel.getWidth());
System.out.println("HEIGHT : " + drawPanel.getHeight());
}
class MyDraw extends JComponent
{
private int x;
private int y;
private Timer timer;
public MyDraw(int x, int y)
{
this.x = x;
this.y = y;
}
public int getXValue()
{
return x;
}
public int getYValue()
{
return y;
}
public void setXYValues(int x, int y)
{
this.x = x;
this.y = y;
repaint();
}
public Dimension getPreferredSize()
{
return (new Dimension(300, 300));
}
public void paintComponent(Graphics g)
{
g.setColor(Color.WHITE);
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(Color.BLUE);
g.fillOval(x, y, 40, 40);
}
}
}
封装测试；
导入javax.swing.*；
导入java.awt.*；
导入java.awt.event.*；
公共课叙事
{
私人INTX；
私营企业；
私人整数计数；
//私有int drawPanel.getWidth（）；
//private int drawPanel.getHeight（）；
私人价值；
私有布尔标志；
/*
*这些变量用于跟踪
*球要么向左，要么向右
*根据这一点，我们将设置
*坐标。
*/
私有布尔toLeft，toRight；
自上而下的私有布尔值；
私人定时器；
私人按钮；
私有ActionListener actionTimer；
私人动作监听按钮；
MyDraw绘图面板；
公共民谣（）
{
x=y=count=0；
flag=toLeft=false；
toRight=正确；
fromTop=true；
fromBottom=false；
private HierarchyBoundsListener boundsListener =
new HierarchyBoundsListener()
{
public void ancestorMoved(HierarchyEvent he)
{
}
public void ancestorResized(HierarchyEvent he)
{
JComponent component = (JComponent) he.getComponent();
width = component.getWidth() - 30;
height = component.getHeight() - 30;
}
};
drawPanel.addHierarchyBoundsListener(boundsListener);