如何使用计时器在java中每隔x秒随机显示图像？ [英] How can I make image appear randomly every x seconds in java using timer?
问题描述
我正在制作一款游戏，我需要击中鼠标/鼠标，它会消失，你会获得1分。
我每次启动应用程序时都会随机出现，但我希望每隔x秒使用Timer（）或其他东西随机绘制图像。
I'm working on a game in which I need to 'hit' a mouse/rat, it will disappear and you'll get 1 point. I made it randomly appear everytime i start the app, but I want the image te be drawn randomly every x seconds using Timer() or something.
My游戏屏幕的代码如下所示：
My code for the game screen looks like this:
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Gamevenster extends JPanel implements Runnable {
public String Gamestatus = "active";
private Thread thread;
//public Main game;
public int random(int min, int max) {
int range = (max - min) + 1;
return (int)(Math.random() * range) + min;
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(achtergrond, 0, 0, this.getWidth(), this.getHeight(), null);
//g.drawImage(muisje, 10, 10, null);
g.drawImage(muisje, random(0, this.getWidth()), random(0, this.getHeight()), null);
}
private static final long serialVersionUID = 1L;
Image achtergrond, muisje;
JTextField invoer;
JButton raden;
JButton menu;
Gamevenster() {
setLayout(null);
ImageIcon icon = new ImageIcon(this.getClass().getResource("assets/achtergrondspel.png"));
achtergrond = icon.getImage();
ImageIcon icon2 = new ImageIcon(this.getClass().getResource("assets/muisje.png"));
muisje = icon2.getImage();
//Get the default toolkit
Toolkit toolkit = Toolkit.getDefaultToolkit();
//Load an image for the cursor
Image image = toolkit.getImage("src/assets/hand.png");
//Create the hotspot for the cursor
Point hotSpot = new Point(0,0);
//Create the custom cursor
Cursor cursor = toolkit.createCustomCursor(image, hotSpot, "Hand");
//Use the custom cursor
setCursor(cursor);
// setLayout( null );
// Invoer feld
invoer = new JTextField(10);
invoer.setLayout(null);
invoer.setBounds(150, 474, 290, 60); // Verander positie onder aan scherm is int 1
// Button voor raden
raden = new JButton("Raden");
raden.setLayout(null);
raden.setBounds(10, 474, 130, 60);
raden.setFont(new Font("Dialog", 1, 20));
raden.setForeground(Color.white);
raden.setBackground(new Color(46, 204, 113));
raden.setPreferredSize(new Dimension(130, 60));
// Menu knop
menu = new JButton("Menu");
menu.setLayout(null);
menu.setBounds(450, 474, 130, 60);
menu.setFont(new Font("Dialog", 1, 20));
menu.setForeground(Color.white);
menu.setBackground(new Color(46, 204, 113));
menu.setPreferredSize(new Dimension(130, 60));
// Toevoegen aan screen
add(invoer);
//add(raden);
add(menu);
menu.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String i = invoer.getText();
System.out.println("Er is gedrukt! " + i);
}
});
}
public void start(){
thread = new Thread(this,"spelloop");
thread.start();
}
public void run() {
// TODO Auto-generated method stub
while(Gamestatus=="active"){
System.out.println("Gameloop werkt");
}
}
}
你可以看到我' m使用g.drawImage（muisje，random（0，this.getWidth（）），random（0，this.getHeight（）），null）;
as you can see I'm using g.drawImage(muisje, random(0, this.getWidth()), random(0, this.getHeight()), null);
所以它在启动时随机添加图像。
So it randomly add the image on startup.
当应用程序开启时，如何每隔x秒使用计时器执行此操作？
How can I use a timer to do this every x seconds when the app is openend?
推荐答案
当应用程序开启时，如何每隔x秒使用计时器执行此操作？
"How can I use a timer to do this every x seconds when the app is openend?"
看一下这个例子。我从互联网上收集了图像，但你可以使用图像文件来做同样的事情。我所做的是使用一个 URL 和 BufferedImage 的数组，得到一个随机索引500毫秒和 repaint（）面板
Have a look at this example. I gathered Images from the internet, but you can do the same using image files. What I did was use an array of URL and BufferedImage and got a random index ever 500 milliseconds and repaint() the panel
注意如果要使用图像文件，可能需要查看这个答案 。
Note If you are going to use image files, you may want to look at this answer also.
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
public class TestImageRotate {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
@Override
public void run() {
JFrame frame = new JFrame("Image Timer");
frame.add(new ImagePanel());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
private static class ImagePanel extends JPanel {
URL[] urls;
BufferedImage[] images;
Random rand = new Random();
public ImagePanel() {
urls = new URL[5];
try {
urls[0] = new URL("http://www.atomicframework.com/assetsY/img/stackoverflow_chicklet.png");
urls[1] = new URL("http://www.iconsdb.com/icons/download/orange/stackoverflow-256.png");
urls[2] = new URL("http://img.1mobile.com/market/screenshot/50/com.dd.stackoverflow/0.png");
urls[3] = new URL("http://www.iconsdb.com/icons/download/orange/stackoverflow-4-512.png");
urls[4] = new URL("http://www.iconsdb.com/icons/preview/light-gray/stackoverflow-xxl.png");
images = new BufferedImage[5];
images[0] = ImageIO.read(urls[0]);
images[1] = ImageIO.read(urls[1]);
images[2] = ImageIO.read(urls[2]);
images[3] = ImageIO.read(urls[3]);
images[4] = ImageIO.read(urls[4]);
} catch (MalformedURLException ex) {
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
}
setBackground(Color.BLACK);
Timer timer = new Timer(500, new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
repaint();
}
});
timer.start();
}
private int random() {
int index = rand.nextInt(5);
return index;
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
BufferedImage img = images[random()];
g.drawImage(img, 0, 0, 400, 400, 0, 0,
img.getWidth(), img.getHeight(), this);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 400);
}
}
}
注意 Timer 代码。这就是我所做的一切
Notice the Timer code. This is all I did
Timer timer = new Timer(500, new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
repaint();
}
});
timer.start();
对于 .grawImage 我使用的是来自阵列的随机索引BufferedImages
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
BufferedImage img = images[random()];
g.drawImage(img, 0, 0, 400, 400, 0, 0,
img.getWidth(), img.getHeight(), this);
}
UPDATE 示例。我关闭了我的IDE过夜。懒得开，所以我只想在我走的时候拿出来。如果你还没有，我会在明天起床时添加一个真实的例子。
UPDATE Example. I shut down my IDE for the night. Too lazy to open so I'm just going to come up with this as I go. If you still don't it, I'll add a real example tomorrow when I get up.
基本上你想拥有x和y位置的全局变量鼠标图像
Basically you want to have global variable for the x and y locations of the mouse image
int x = 0;
int y = 0;
当您绘制图像时，您想要使用这些位置
When you draw the image, you want to use these locations
g.drawImage(img, x, y, whatEverWidth, whatEverHeight, this);
在计时器中，您可以在绘制之前随机修改x和y。让我们用一些逻辑。
In the timer, you can modify the x and y randomly before you paint. Let use some logic.
假设您的scree宽度为500，屏幕高度为500，鼠标图像宽度为100，鼠标图像高度为100
Let say your scree width is 500 and screen height is 500 and mouse image width is 100 and mouse image height is 100
- 因此，最大x位置将为400 =屏幕宽度 - 鼠标图像宽度
- 并且最大y位置将为400 =屏幕高度 - 鼠标图像身高
现在我们有了我们的范围。我们知道min x位置是0而min y位置是0.所以我们想要每个x和y的0到400的随机数。所以在计时器中你可以做到
So now we have our ranges. We know min x location is 0 and min y location is 0. So we want a random number from 0 to 400 for each x and y. So in the timer you can do
Timer timer = new Timer(1000, new ActionListener(){
public void actionPerformed(ActionEvent e) {
x = rand.nextInt(400) + 1;
y = rand.nextInt(400) + 1;
repaint();
}
});
每次调用重绘时，这将在随机位置重新绘制鼠标图像。
This will repaint your mouse image at a random location every time repaint is called.
我不知道还有什么可以解释。我做了只是我指出的那些事情（使用我的原始代码），只添加了 x 和 y 并用它们绘制图像，并在计时器中获得一个随机位置。它对我来说非常好。我不知道你做错了什么。
I don't know what else is there to explain. I did just those things I pointed out(with my original code), just added an x and y and used them to draw the image, and got a random location in the timer. It's works perfectly fine for me. I don't know what you're doing wrong.
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
public class TestImageRotate {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
@Override
public void run() {
JFrame frame = new JFrame("Image Timer");
frame.add(new ImagePanel());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
private static class ImagePanel extends JPanel {
URL[] urls;
BufferedImage[] images;
Random rand = new Random();
private int x = 0;
private int y = 0;
public ImagePanel() {
urls = new URL[5];
try {
urls[0] = new URL("http://www.atomicframework.com/assetsY/img/stackoverflow_chicklet.png");
urls[1] = new URL("http://www.iconsdb.com/icons/download/orange/stackoverflow-256.png");
urls[2] = new URL("http://img.1mobile.com/market/screenshot/50/com.dd.stackoverflow/0.png");
urls[3] = new URL("http://www.iconsdb.com/icons/download/orange/stackoverflow-4-512.png");
urls[4] = new URL("http://www.iconsdb.com/icons/preview/light-gray/stackoverflow-xxl.png");
images = new BufferedImage[5];
images[0] = ImageIO.read(urls[0]);
images[1] = ImageIO.read(urls[1]);
images[2] = ImageIO.read(urls[2]);
images[3] = ImageIO.read(urls[3]);
images[4] = ImageIO.read(urls[4]);
} catch (MalformedURLException ex) {
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
}
setBackground(Color.BLACK);
Timer timer = new Timer(500, new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
x = rand.nextInt(325);
y = rand.nextInt(325);
repaint();
}
});
timer.start();
}
private int random() {
int index = rand.nextInt(5);
return index;
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
BufferedImage img = images[random()];
g.drawImage(img, x, y, 75, 75, this);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 400);
}
}
}
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