Java 如何在JPanel中移动多个对象
我想创建多个同时独立移动的正方形,我认为最有效的方法是通过Graphics2D中的变换方法,但我不确定如何使其适用于每个正方形。我希望正方形对象自包含并创建自己的变换(实例变换)。这是我到目前为止所拥有的 变压器面板Java 如何在JPanel中移动多个对象,java,graphics,jpanel,transform,graphics2d,Java,Graphics,Jpanel,Transform,Graphics2d,我想创建多个同时独立移动的正方形,我认为最有效的方法是通过Graphics2D中的变换方法,但我不确定如何使其适用于每个正方形。我希望正方形对象自包含并创建自己的变换(实例变换)。这是我到目前为止所拥有的 变压器面板 import javax.swing.*; import java.awt.*; import java.awt.geom.AffineTransform; import java.util.Random; import java.util.concurrent.TimeUnit
import javax.swing.*;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.util.Random;
import java.util.concurrent.TimeUnit;
public class TranformPanel extends JPanel {
private int[] xcoords = {250,248,253,255,249};
private int[] ycoords = {250,253,249,245,250};
private double randomx = 0;
private double randomy = 0;
public void paintComponent(Graphics g)
{
super.paintComponent(g);
drawTransform(g,randomx,randomy);
}
private void drawTransform(Graphics g,double randomx,double randomy)
{
Random rn = new Random();
int xnum = rn.nextInt(10)-5;
randomx = xnum;
int ynum = rn.nextInt(10)-5;
randomy = ynum;
Rectangle rect = new Rectangle(250,250,10,10);
AffineTransform transform = new AffineTransform();
Graphics2D g2d = (Graphics2D)g;
transform.translate(randomx,randomy);
g2d.draw(transform.createTransformedShape(rect));
}
}
变形金刚
import java.awt.*;
import javax.swing.*;
import java.awt.geom.AffineTransform;
import java.util.Scanner;
import java.util.concurrent.TimeUnit;
public class TransformDraw{
private static TranformPanel panel = new TranformPanel();
public static void main(String[] args) {
// Setup our JFrame details
JFrame frame = new JFrame();
frame.setTitle("Transform Polygon Example");
frame.setSize(500,500);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.setVisible(true);
frame.add(panel);
Scanner input = new Scanner(System.in);
for (int i=0;i<10;i++)
{
try {
TimeUnit.SECONDS.sleep(1);
frame.repaint();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
import java.awt.*;
导入javax.swing.*;
导入java.awt.geom.AffineTransform;
导入java.util.Scanner;
导入java.util.concurrent.TimeUnit;
公共类{
私有静态TranformPanel=新TranformPanel();
公共静态void main(字符串[]args){
//设置JFrame详细信息
JFrame=新JFrame();
frame.setTitle(“变换多边形示例”);
框架。设置尺寸(500500);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(新的BorderLayout());
frame.setVisible(true);
框架。添加(面板);
扫描仪输入=新扫描仪(System.in);
对于(inti=0;i来说,首先创建一些可以管理其位置(和其他属性)并且可以“绘制”的内容
因此,这是非常基本的,它所能做的就是更新(在给定的区域内)并进行绘制。您可以根据您的特殊需要公开其他属性(例如它的边界框)
接下来,我们需要一个简单的实现,比如
public class DefaultBox implements Box {
private Color color;
private Rectangle bounds;
private int xDelta;
private int yDelta;
public DefaultBox(Color color, Dimension size) {
this.color = color;
bounds = new Rectangle(new Point(0, 0), size);
xDelta = 1 + (int) (Math.random() * 10);
yDelta = 1 + (int) (Math.random() * 10);
}
@Override
public void update(Dimension size) {
bounds.x += xDelta;
bounds.y += yDelta;
if (bounds.x < 0) {
bounds.x = 0;
xDelta *= -1;
} else if (bounds.x + bounds.width > size.width) {
bounds.x = size.width - bounds.width;
xDelta *= -1;
}
if (bounds.y < 0) {
bounds.y = 0;
yDelta *= -1;
} else if (bounds.y + bounds.height > size.height) {
bounds.y = size.height - bounds.height;
yDelta *= -1;
}
}
@Override
public void paint(Graphics2D g2d) {
g2d.setColor(color);
g2d.fill(bounds);
}
}
好的,同样,这是非常简单的。它维护了一个列表的框,一个Swing计时器来定期更新列表的框,调用他们的更新方法。计时器简单地调用重新绘制,它(以一种循环的方式)最后调用paintComponent
,然后对Box
的每个实例调用paint
100盒
创建一个类,该类知道单个框的位置,当您需要一个编程器时,使用该类来绘制所述框-请详细说明。我将如何跟踪框的位置,以及如何为每个框创建该类的对象?此外,我将如何转换其位置?感谢您的详细说明。我复制并粘贴了代码,但它没有'不符合Ecplise的启动参数。有解决方案吗?我不知道是什么“但不符合Ecplise的启动参数”也就是说,我不使用Eclipse。代码将从命令行编译和运行,很好,代码没有什么特别之处。别担心。我只是很愚蠢,忘了在不同的java文件>中创建TestPanel对象。欢迎来到我的世界:P
public class DefaultBox implements Box {
private Color color;
private Rectangle bounds;
private int xDelta;
private int yDelta;
public DefaultBox(Color color, Dimension size) {
this.color = color;
bounds = new Rectangle(new Point(0, 0), size);
xDelta = 1 + (int) (Math.random() * 10);
yDelta = 1 + (int) (Math.random() * 10);
}
@Override
public void update(Dimension size) {
bounds.x += xDelta;
bounds.y += yDelta;
if (bounds.x < 0) {
bounds.x = 0;
xDelta *= -1;
} else if (bounds.x + bounds.width > size.width) {
bounds.x = size.width - bounds.width;
xDelta *= -1;
}
if (bounds.y < 0) {
bounds.y = 0;
yDelta *= -1;
} else if (bounds.y + bounds.height > size.height) {
bounds.y = size.height - bounds.height;
yDelta *= -1;
}
}
@Override
public void paint(Graphics2D g2d) {
g2d.setColor(color);
g2d.fill(bounds);
}
}
public class TestPane extends JPanel {
private List<Box> boxes;
private Color[] colors = {Color.RED, Color.BLACK, Color.BLUE, Color.CYAN, Color.DARK_GRAY, Color.GREEN, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE, Color.PINK, Color.WHITE, Color.YELLOW};
public TestPane() {
boxes = new ArrayList<>(25);
for (int index = 0; index < 100; index++) {
Color color = colors[(int) (Math.random() * colors.length)];
int width = 10 + (int) (Math.random() * 9);
int height = 10 + (int) (Math.random() * 9);
boxes.add(new DefaultBox(color, new Dimension(width, height)));
}
Timer timer = new Timer(40, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
for (Box box : boxes) {
box.update(getSize());
}
repaint();
}
});
timer.start();
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
protected void paintComponent(Graphics g) {
super.paintComponent(g);
for (Box box : boxes) {
Graphics2D g2d = (Graphics2D) g.create();
box.paint(g2d);
g2d.dispose();
}
}
}