java画圆形的代码 javagui画圆

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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;

}

相关问答

Q1: JAVA画圆

import java.awt.Frame;

import java.awt.Graphics;

public class S extends Frame{

private int x;

private int y;

private boolean drawOval;//为true时绘制

//测试入口函数

public static void main(String []args)

{

new S().print();

}

//构造函数,初始化x、y坐标，设置drawOval变量为false，设置窗体大小

public S()

{

x = 200;

y = 200;

drawOval = false;

this.setSize(400,400);

this.setVisible(true);

}

public void print(){

//在调用S类实例的print方法时,画一个以属性X,Y为起点的宽高为10的圆.

drawOval = true; //设置drawOval变量为true

repaint(); //调用刷新画面方法

}

public void paint(Graphics g)

{

//为true时绘制

if(drawOval)g.fillOval(x,y,10,10);

}

Q2: 用java画一个圆

import java.awt.*;

import java.applet.*;

import java.awt.event.*;

class MyCanvas extends Canvas

{

int x,y,r,n;

int x0,y0;

MyCanvas()

{

setSize(100,100);

setBackground(Color.red);

}

public void setX(int x)

{

this.x=x;

}

public void setY(int y)

{

this.y=y;

}

public void setR(int r)

{

this.r=r;

}

public void setN(int n)

{

this.n=n;

}

public void paint(Graphics g1)

{

for(int i=0;i=360;i=i+360/n)

{

x0 = (int)(x+r*Math.cos(i));

y0 = (int)(y+r*Math.sin(i));

g1.drawString("*",x0,y0);}

}

public class e1 extends Applet implements ActionListener

{

MyCanvas canvas;

TextField inputR,inputX,inputY,inputN;

Label label1,label2,label3;

Button b1,b2;

public void init()

{

canvas = new MyCanvas();

inputR = new TextField(6);

inputX = new TextField(6);

inputY = new TextField(6);

inputN = new TextField(6);

b1 = new Button("确定");

b1.addActionListener(this);

label1 = new Label("输入位置坐标:");

label2 = new Label("输入半径:");

label3 = new Label("输入要打印的*数:");

add(label1);

add(inputX);

add(inputY);

add(label2);

add(inputR);

add(label3);

add(inputN);

add(b1);

add(canvas);

}

public void actionPerformed(ActionEvent e)

{

int x=0,y=0,n=0,r=0;

try

{

x=Integer.valueOf(inputX.getText()).intValue();

y=Integer.valueOf(inputY.getText()).intValue();

n=Integer.valueOf(inputN.getText()).intValue();

r=Integer.valueOf(inputR.getText()).intValue();

canvas.setX(x);

canvas.setY(y);

canvas.setR(r);

canvas.setN(n);

canvas.repaint();

}

catch(NumberFormatException ee)

{

x = 0;

y = 0;

r = 0;

n = 0;

}

public void draw(Graphics2D g) {

g.setColor(color);//设置颜色

g.setStroke(stroke);／／宽度

int x, y, w, h;

if (startX endX) {／／以下的startx 、endx都是由鼠标拖动事件得到

x = endX;

w = startX - endX;

} else {

x = startX;

w = endX - startX;

}

if (startY endY) {

y = endY;

h = startY - endY;

} else {

y = startY;

h = endY - startY;

}

g.drawOval(x, y, w, h);

}

Q3: java 如何用两个循环画圆

其实就是遍历每一个点java画圆形的代码，如果在圆形上，则输出#，不在圆形上，则输出空格。

代码如下java画圆形的代码：

float x = 14;

float y = 8;

float r = 5;

for (int i = 0; i 20; i++) {

for (int j = 0; j 20; j++) {

float result = (i - x) * (i - x) + (j - y) * (j - y) - r * r; // 圆心公式

if (result 5 result -5) { // 5 为精度范围

System.out.print("#");

} else {

System.out.print(" ");

}

System.out.println("");

}

Q4: 用JAVA编写圆

代码如下java画圆形的代码：

import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class TestSw extends JFrame { public static void main(String[] args) { new TestSw(); } public TestSw(){ super("Test"); this.setSize(new Dimension(400,300)); this.setContentPane(new Mypane()); this.setVisible(true); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } class Mypane extends JPanel{ public void paint(Graphics g) { super.paint(g); g.setColor(Color.red); g.setXORMode(Color.white); g.drawArc(20, 20, 100, 100, 0, 360); ///此方法将画一个直径100java画圆形的代码的圆.红色. } } }

Q5: 求一个java程序：绘图程序包括画圆，椭圆，线，矩形，自定义。并且可以调图形颜色！

public enum ShapeTypes {

LINE, CIRCLE, RECTANGLE

}

public interface Shape {

void paint(Graphics g);

}

public class Rectangle implements Shape {

// 矩形左上角的坐标

private int x, y;

// 矩形的宽度和高度

private int width, height;

private Color rectangleColor;

public Rectangle() {

super();

}

public Rectangle(int x, int y, int width, int height, Color rectangleColor) {

super();

this.x = x;

this.y = y;

this.width = width;

this.height = height;

this.rectangleColor = rectangleColor;

}

@Override

public void paint(Graphics g) {

g.setColor(rectangleColor);

g.drawRect(x, y, width, height);

}

public class Line implements Shape {

// 直线的起始位置

private int x1, y1;

// 直线的终止位置

private int x2, y2;

private Color lineColor;

public Line(int x1, int y1, int x2, int y2, Color lineColor) {

super();

this.x1 = x1;

this.y1 = y1;

this.x2 = x2;

this.y2 = y2;

this.lineColor = lineColor;

}

public Line() {

super();

}

@Override

public void paint(Graphics g) {

g.setColor(lineColor);

g.drawLine(x1, y1, x2, y2);

}

public class Circle implements Shape {

// 圆的颜色

private Color circleColor;

// 圆心的坐标

private int x, y;

// 圆的半径

private int radius;

public Circle() {

super();

}

public Circle(int x, int y, int radius, Color circleColor) {

super();

this.circleColor = circleColor;

this.x = x;

this.y = y;

this.radius = radius;

}

@Override

public void paint(Graphics g) {

g.setColor(circleColor);

// 画弧, 当弧的宽度和高度一致且从0~360度时就是原形了

g.drawArc(x, y, radius, radius, 0, 360);

}

public class SketchpadPanel extends Canvas implements MouseListener, MouseMotionListener {

private static final long serialVersionUID = -5229161042153132522L;

// 鼠标点击起始坐标和当前坐标

private int beginX = 0, beginY = 0, currentX = 0, currentY = 0;

// 判断鼠标是否被按下

private boolean isMousePressing = false;

// 保存当前的图形, 在撤销和恢复时使用

private final StackShape currentShapes = new StackShape();

// 保存已经删除过的图形

private final StackShape deletedShapes = new StackShape();

private ShapeTypes type;

private Color color;

public SketchpadPanel() {

addMouseListener(this);

addMouseMotionListener(this);

}

/**

* 撤销方法

public void undo() {

if (currentShapes.size() 0) {

// 从所有保存过的图形中取出最后一个, 放入到已删除的图形中去

Shape shape = currentShapes.pop();

deletedShapes.push(shape);

repaint();

}

/**

* 恢复撤销方法

public void redo() {

if (deletedShapes.size() 0) {

// 从所有删除的图形中取出最后一个, 放入保存的图形中

Shape shape = deletedShapes.pop();

currentShapes.push(shape);

repaint();

}

/**

* 设置命令

* @param type

public void setShapeType(ShapeTypes type) {

this.type = type;

}

/**

* 设置颜色

* @param color

public void setColor(Color color) {

this.color = color;

}

public void updete(Graphics g) {

paint(g);

}

/**

* 绘制画板

@Override

public void paint(Graphics g) {

// 绘制画板

Dimension size = getSize();

int width = size.width;

int height = size.height;

g.setColor(Color.WHITE);

g.fillRect(0, 0, width, height);

// 绘制所有图形

Shape shape = null;

EnumerationShape e = currentShapes.elements();

while (e.hasMoreElements()) {

shape = e.nextElement();

shape.paint(g);

}

// 如果当前鼠标没有释放

if (isMousePressing) {

g.setColor(color);

switch (type) {

// 绘制直线

case LINE:

g.drawLine(beginX, beginY, currentX, currentY);

break;

// 绘制矩形

case RECTANGLE:

if (currentX beginX) {

if (currentY beginY) {

// 如果当前位置在起始位置的左上方, 则以鼠标当前位置为矩形的左上角位置

g.drawRect(currentX, currentY, beginX - currentX, beginY - currentY);

} else {

// 如果当前位置在起始位置的左下方, 则以鼠标当前位置的横坐标和起始位置的纵坐标作为矩形的左上角位置

g.drawRect(currentX, beginY, beginX - currentX, currentY - beginY);

}

} else {

if (currentY beginY) {

// 如果当前位置在起始位置的右上方, 则以鼠标起始位置的很坐标和当前位置的纵坐标作为矩形的左上角位置

g.drawRect(beginX, currentY, currentX - beginX, beginY - currentY);

} else {

// 如果当前位置在起始位置的右下方, 则已起始位置作为矩形的左上叫位置

g.drawRect(beginX, beginY, currentX - beginX, currentY - beginY);

}

break;

// 绘制圆形

case CIRCLE:

// 半径为a*a + b*b的平方根

int radius = (int) Math

.sqrt((beginX - currentX) * (beginX - currentX) + (beginY - currentY) * (beginY - currentY));

g.drawArc(beginX - radius / 2, beginY - radius / 2, radius, radius, 0, 360);

break;

}

@Override

public void mouseClicked(MouseEvent e) {

}

@Override

public void mouseEntered(MouseEvent e) {

}

@Override

public void mouseExited(MouseEvent e) {

}

/**

* 当鼠标按下的时候获得起始坐标

@Override

public void mousePressed(MouseEvent e) {

beginX = e.getX();

beginY = e.getY();

isMousePressing = true;

}

/**

* 当鼠标释放时获得当前坐标

@Override

public void mouseReleased(MouseEvent e) {

currentX = e.getX();

currentY = e.getY();

isMousePressing = false;

// 当释放鼠标时, 将绘制的图形保存到shapes中

switch (type) {

// 绘制直线

case LINE:

Line line = new Line(beginX, beginY, currentX, currentY, color);

currentShapes.push(line);

break;

// 绘制圆形

case CIRCLE:

// 半径为a*a + b*b的平方根

int radius = (int) Math

.sqrt((beginX - currentX) * (beginX - currentX) + (beginY - currentY) * (beginY - currentY));

Circle circle = new Circle(beginX - radius / 2, beginY - radius / 2, radius, color);

currentShapes.push(circle);

break;

// 绘制矩形

case RECTANGLE:

Rectangle rectangle = null;

if (currentX beginX) {

if (currentY beginY) {

rectangle = new Rectangle(currentX, currentY, beginX - currentX, beginY - currentY, color);

} else {

rectangle = new Rectangle(currentX, beginY, beginX - currentX, currentY - beginY, color);

}

} else {

if (currentY beginY) {

rectangle = new Rectangle(beginX, currentY, currentX - beginX, beginY - currentY, color);

} else {

rectangle = new Rectangle(beginX, beginY, currentX - beginX, currentY - beginY, color);

}

currentShapes.push(rectangle);

break;

}

repaint();

}

@Override

public void mouseDragged(MouseEvent e) {

currentX = e.getX();

currentY = e.getY();

this.repaint();

}

@Override

public void mouseMoved(MouseEvent e) {

}

public class SketchpadFrame extends JFrame {

private static final long serialVersionUID = -7080053971741609904L;

private final JPanel commandPanel = new JPanel(); // 存放命令的面板

private final JPanel colorPanel = new JPanel(); // 存放颜色的面板

private final JPanel mainPanel = new JPanel(); // 主面板

private final JButton redButton = new JButton("红色");

private final JButton blueButton = new JButton("蓝色");

private final JButton greenButton = new JButton("绿色");

private final JButton lineButton = new JButton("直线");

private final JButton circleButton = new JButton("圆");

private final JButton rectangleButton = new JButton("矩形");

private final JButton undoButton = new JButton("撤销");

private final JButton redoButton = new JButton("恢复撤销");

private final JButton exitButton = new JButton("退出");

SketchpadPanel sketchPanel = new SketchpadPanel();

private void initFrame() {

commandPanel.setLayout(new FlowLayout());

commandPanel.add(lineButton);

commandPanel.add(circleButton);

commandPanel.add(rectangleButton);

commandPanel.add(undoButton);

commandPanel.add(redoButton);

commandPanel.add(exitButton);

colorPanel.setLayout(new FlowLayout());

colorPanel.add(redButton);

colorPanel.add(blueButton);

colorPanel.add(greenButton);

mainPanel.setLayout(new BorderLayout());

mainPanel.add(commandPanel, BorderLayout.NORTH);

mainPanel.add(colorPanel, BorderLayout.CENTER);

getContentPane().add("South", mainPanel);

getContentPane().add("Center", sketchPanel);

// 初始化设置:颜色和命令

lineButton.setForeground(Color.RED);

sketchPanel.setColor(Color.RED);

redButton.setForeground(Color.RED);

sketchPanel.setShapeType(ShapeTypes.LINE);

}

private void initListener() {

redButton.addActionListener(new ActionListener() {

@Override