JAVA画圆形和三角形的简单题目，求源代码

import java.awt.AlphaComposite;

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import java.awt.BasicStroke;

import java.awt.Color;

import java.awt.Composite;

import java.awt.GradientPaint;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Paint;

import java.awt.Shape;

import java.awt.geom.AffineTransform;

import javax.swing.ImageIcon;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.SwingUtilities;

import com.sun.awt.AWTUtilities;

public class demo extends JPanel

{

public demo()

{

//super();

setVisible(true);

setBackground(Color.BLACK);

setForeground(Color.WHITE);

setBounds(0, 0, 600, 600);

}

public static void main(String[] args)

{

JFrame f = new JFrame();

AWTUtilities.setWindowOpacity(f, 0.8f);

f.setSize(1024, 768);

f.add(new demo());

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.setVisible(true);

}

@Override

public void paint(Graphics g)

{

super.paint(g);

Graphics2D g2d=(Graphics2D)g;

int width = getWidth()/2;

int height = getHeight()/2;

g2d.setStroke(new BasicStroke(6));//粗细

g2d.setColor(Color.red);

g2d.drawArc (5, 5, 500, 750, 45, 90+45); //圆弧

AlphaComposite alphaComposite=AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.42f);

g2d.setComposite(alphaComposite);//透明度

AffineTransform affineTransform=new AffineTransform();

affineTransform.setToTranslation(0, 0);

affineTransform.setToRotation(Math.PI/10);//旋转

g2d.transform(affineTransform);

ImageIcon imageIcon= new ImageIcon(getClass().getResource("mac.jpg"));

g2d.drawImage(imageIcon.getImage(),0,0,null);//背景

Paint paint=new GradientPaint(0, 0, Color.RED, 222,222, Color.green, true);

g2d.setPaint(paint);

g2d.fillRoundRect(188, 188, 300, 300, 33, 33);//矩形

g2d.setClip(50,50,300, 300);

g2d.setColor(Color.blue);

g2d.fillPolygon(new int[] {0,200,400},new int[] {333,0,333},3);//三角形

JAVA画一个移动的圆

import java.awt.Color;

import java.awt.Graphics;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class PaintOval {

public static void main(String[] args) {

JFrame frame=new JFrame();

frame.setSize(1024, 768);

MyPanel panel=new MyPanel();

frame.add(panel);

Thread thread =new Thread(panel);

thread.start();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

}

class MyPanel extends JPanel implements Runnable{

int x=30,y=30;

public void paint(Graphics g){

super.paint(g);

g.setColor(Color.red);

g.drawOval(x, y, 50, 50);

}

public void run(){

while(true){

x++;

if(x1034){

x=0;

}

try{

Thread.sleep(20);

}catch(Exception e){

e.printStackTrace();

}

repaint();

}

}

}

我不知道你要什么方向移动的圆，我就画了向右移动的圆

急求Java代码，定义一个Circle(圆类型）

public class Exam

{

public static void main(String[] args)

{

Circle c=new Circle(3,4,5);

System.out.printf("圆心：(%f,%f)，半径：%f，面积：%f",c.x,c.y,c.r,c.countArea());

}

}

class Circle

{

public Circle()

{

this(0,0,0);

}

public Circle(double x,double y,double r)

{

this.x=x;

this.y=y;

this.r=r;

}

public double countArea()

{

return Math.PI*r*r;

}

/*private*/public double x,y,r;

}

java写上字母的同心圆旋转问题

//我给你动画的代码。然后你可以参考它写出自己想要的效果。

package 练习题;

import java.awt.Color;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.Date;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.Timer;

public class Graphics extends JFrame {

Thread th1 = null;

Graphics offScreen = null;

private int i=0;

private JPanel NewPanel=new NewPanel();

public Graphics() {

add(NewPanel);

Timer timer=new Timer(1000,new TimerListener());

timer.start();

}

public static void main(String[] args) {

Graphics frame = new Graphics();

frame.setTitle("Test");

frame.setSize(500, 400);

frame.setLocationRelativeTo(null);

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

class NewPanel extends JPanel {

/**

*

*/

private static final long serialVersionUID = 1L;

protected void paintComponent(java.awt.Graphics g) {

super.paintComponent(g);

int Xcenter = getWidth() / 2;

int Ycenter = getHeight() / 2;

int radius = (int) (Math.min(getWidth(), getHeight()) * 0.4);

int x = Xcenter - radius;

int y = Ycenter - radius;

g.fillArc(x, y, 2 * radius, 2 * radius, 0 + i, 30);

g.fillArc(x, y, 2 * radius, 2 * radius, 90 + i, 30);

g.fillArc(x, y, 2 * radius, 2 * radius, 270 + i, 30);

g.fillArc(x, y, 2 * radius, 2 * radius, 180 + i, 30);

g.setColor(Color.red);

g.fillArc(x, y, 2 * radius, 2 * radius, 45 + i, 30);

g.fillArc(x, y, 2 * radius, 2 * radius, 135 + i, 30);

g.fillArc(x, y, 2 * radius, 2 * radius, 315 + i, 30);

g.fillArc(x, y, 2 * radius, 2 * radius, 225 + i, 30);

}

}

class TimerListener implements ActionListener {

@Override

public void actionPerformed(ActionEvent arg0) {

// TODO Auto-generated method stub

i++;

NewPanel.repaint();

}

}

}

java 怎么让一个图形绕一个点旋转360度

import java.awt.Canvas;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.RenderingHints;

import java.awt.image.BufferedImage;

/**

* @author ZhengYesheng

*/

public class RotateImageCanvas extends Canvas implements Runnable

{

private static final long serialVersionUID = -1997487731464495923L;

BufferedImage img;

BufferedImage rotatedImg;

int degress = 0;

public RotateImageCanvas(BufferedImage img)

{

super();

this.img = img;

new Thread(this).start();

}

@Override

public void run()

{

while (true)

{

//A，与B的代码配合决定旋转的速度

degress += 1;

degress %= 360;

repaint();

try

{

if (degress == 0)

{

//绕一周后等待的时间在这里设置

Thread.sleep(3 * 1000);

}

else

{

//考虑到视觉平滑，这里不应大约40。

Thread.sleep(30);

}

}

catch (InterruptedException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

@Override

public void paint(Graphics graphics)

{

super.paint(graphics);

//获取旋转指定角度后的图片。为了避免累计误差，这里是用原始图像旋转的

rotatedImg = rotateImage(img, degress);

//绘制旋转后的图片

graphics.drawImage(rotatedImg, 0, 0, this);

}

/**

* 旋转图片为指定角度。

* 注意：1、这个方法实现了图像的基于中点的旋转，要想绕指定点，需要配合Matrix类

*          2、为避免图像被裁切，结果图片的尺寸也需要动态计算

*          3、现在旋转后有黑色背景，如果不需要这个效果，需要设置结果图片的Alpha模式

* 

* @param bufferedimage

*            目标图像

* @param degree

*            旋转角度

* @return

*/

private BufferedImage rotateImage(BufferedImage bufferedimage, int degree)

{

int w = bufferedimage.getWidth();

int h = bufferedimage.getHeight();

int type = bufferedimage.getColorModel().getTransparency();

BufferedImage img;

Graphics2D graphics2d;

(graphics2d = (img = new BufferedImage(w, h, type)).createGraphics())

.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);

graphics2d.rotate(Math.toRadians(degree), w / 2, h / 2);

graphics2d.drawImage(bufferedimage, 0, 0, null);

graphics2d.dispose();

return img;

}

}

java实现风车旋转，为嘛我的画出来时一个圆在旋转

画之前加上g.clearRect(0, 0, getWidth(), getHeight());

不然你上一次画的还会呈现出来

这样呢，就会闪烁，需要使用双缓冲来解决了。

需要请追问。

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