java - 如何使用计时器在java中每隔x秒随机出现图像? [英] How can I make image appear randomly every x seconds in java using timer?
问题描述
我正在开发一款游戏，我需要击中"一只老鼠/老鼠，它会消失，你会得到 1 分.每次启动应用程序时，我都让它随机出现，但我希望使用 Timer() 或其他方法每 x 秒随机绘制一次图像.
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.
我的游戏屏幕代码如下所示:
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");
}
}
}
如你所见，我正在使用 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.
当应用程序处于开放状态时，如何使用计时器每 x 秒执行一次此操作?
How can I use a timer to do this every x seconds when the app is openend?
推荐答案
当应用程序处于开放状态时，我如何使用计时器每隔 x 秒执行一次此操作?"
"How can I use a timer to do this every x seconds when the app is openend?"
看看这个例子.我从互联网上收集了图像，但您可以使用图像文件来做同样的事情.我所做的是使用 URL 和 BufferedImage 的数组，并获得一个每 500 毫秒的随机索引和 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
注意如果您要使用图像文件，您可能需要查看这个答案 还有.
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);
}
}
}
<小时>
注意 Timer 代码.这就是我所做的
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 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);
}
<小时>
更新 示例.我晚上关闭了我的 IDE.懒得打开所以我只是想在我走的时候想出这个.如果还是不行，我明天起床再补充一个真实的例子.
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.
基本上你想要鼠标图像的 x 和 y 位置的全局变量
Basically you want to have global variable for the x and y locations of the mouse image
int x = 0;
int y = 0;
绘制图像时，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.让我们使用一些逻辑.
In the timer, you can modify the x and y randomly before you paint. Let use some logic.
假设您的屏幕宽度为 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
- 所以最大 x 位置将为 400 = 屏幕宽度 - 鼠标图像宽度
- 最大 y 位置将为 400 = 屏幕高度 - 鼠标图像高度
所以现在我们有了我们的范围.我们知道最小 x 位置为 0，最小 y 位置为 0.所以我们希望每个 x 和 y 都有一个从 0 到 400 的随机数.所以在计时器中你可以做
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 repaint 时，这都会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.
我不知道还有什么要解释的.我只是做了我指出的那些事情(用我的原始代码)，只是添加了一个 x 和 y 并用它们来绘制图像，并在 timer 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);
}
}
}
这篇关于java - 如何使用计时器在java中每隔x秒随机出现图像?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
