JAVA畫圓形和三角形的簡單題目，求源代碼

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));//粗細

g2d.setColor(Color.red);

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

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);//旋轉(zhuǎn)

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畫一個移動的圓

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動的圓，我就畫了向右移動的圓

急求Java代碼，定義一個Circle(圓類型）

public class Exam

{

public static void main(String[] args)

{

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

System.out.printf("圓心：(%f,%f)，半徑：%f，面積：%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寫上字母的同心圓旋轉(zhuǎn)問題

//我給你動畫的代碼。然后你可以參考它寫出自己想要的效果。

package 練習(xí)題;

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 怎么讓一個圖形繞一個點旋轉(zhuǎn)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，與B的代碼配合決定旋轉(zhuǎn)的速度

degress?+=?1;

degress?%=?360;

repaint();

try

{

if?(degress?==?0)

{

//繞一周后等待的時間在這里設(shè)置

Thread.sleep(3?*?1000);

}

else

{

//考慮到視覺平滑，這里不應(yīng)大約40。

Thread.sleep(30);

}

}

catch?(InterruptedException?e)

{

//?TODO?Auto-generated?catch?block

e.printStackTrace();

}

}

}

@Override

public?void?paint(Graphics?graphics)

{

super.paint(graphics);

//獲取旋轉(zhuǎn)指定角度后的圖片。為了避免累計誤差，這里是用原始圖像旋轉(zhuǎn)的

rotatedImg?=?rotateImage(img,?degress);

//繪制旋轉(zhuǎn)后的圖片

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

}

/**

*?旋轉(zhuǎn)圖片為指定角度。

*?注意：1、這個方法實現(xiàn)了圖像的基于中點的旋轉(zhuǎn)，要想繞指定點，需要配合Matrix類

*??????????2、為避免圖像被裁切，結(jié)果圖片的尺寸也需要動態(tài)計算

*??????????3、現(xiàn)在旋轉(zhuǎn)后有黑色背景，如果不需要這個效果，需要設(shè)置結(jié)果圖片的Alpha模式

*?

*?@param?bufferedimage

*????????????目標(biāo)圖像

*?@param?degree

*????????????旋轉(zhuǎn)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實現(xiàn)風(fēng)車旋轉(zhuǎn)，為嘛我的畫出來時一個圓在旋轉(zhuǎn)

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

不然你上一次畫的還會呈現(xiàn)出來

這樣呢，就會閃爍，需要使用雙緩沖來解決了。

需要請追問。