用JAVA實(shí)現(xiàn)畫(huà)線(xiàn)，不是直線(xiàn)，而是點(diǎn)住鼠標(biāo)左鍵劃到哪里哪里就畫(huà)線(xiàn)，就

import?java.awt.BasicStroke;

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import?java.awt.BorderLayout;

import?java.awt.Color;

import?java.awt.FlowLayout;

import?java.awt.Frame;

import?java.awt.Graphics;

import?java.awt.Graphics2D;

import?java.awt.Label;

import?java.awt.Panel;

import?java.awt.event.MouseAdapter;

import?java.awt.event.MouseEvent;

import?java.awt.event.MouseMotionListener;

import?java.awt.event.WindowAdapter;

import?java.awt.event.WindowEvent;

public?class?MouseDrawPanel?extends?Frame

{

private?static?final?long?serialVersionUID?=?1L;

MouseEvent?e?=?null;

int?startX?=?-1;

int?startY?=?-1;

int?endX?=?-1;

int?endY?=?-1;

boolean?left?=?false;

public?MouseDrawPanel?(?String?title?)

{

setTitle?(title);

setLayout?(new?BorderLayout?());

setResizable?(false);

setSize?(500,?400);

setLocationRelativeTo?(null);

addWindowListener?(new?WindowAdapter?()

{

@Override

public?void?windowClosing?(?WindowEvent?e?)

{

System.exit?(0);

}

});

}

@Override

public?void?paintComponents?(?Graphics?g?)

{

float?lineWidth?=?8.0f;

(?(Graphics2D)?g?).setStroke?(new?BasicStroke?(lineWidth));

g.setColor?(Color.YELLOW);

g.drawLine?(startX,?startY,?endX,?endY);

g.dispose?();

}

public?static?void?main?(?String[]?args?)

{

final?MouseDrawPanel?mdp?=?new?MouseDrawPanel?("Use?Mouse?Draw");

Panel?panel?=?new?Panel?();

panel.setLayout?(new?FlowLayout?(FlowLayout.LEFT));

Label?startL?=?new?Label?("start:?");

Label?endL?=?new?Label?("end:?");

final?Label?nowL?=?new?Label?("now:?");

final?Label?startR?=?new?Label?("000,000");

final?Label?endR?=?new?Label?("000,000");

final?Label?nowN?=?new?Label?("000,000");

panel.add?(startL);

panel.add?(startR);

panel.add?(endL);

panel.add?(endR);

panel.add?(nowL);

panel.add?(nowN);

mdp.add?(panel,?"South");

mdp.addMouseMotionListener?(new?MouseMotionListener?()

{

@Override

public?void?mouseMoved?(?MouseEvent?e?)

{

if?(mdp.left)

{

nowN.setText?(e.getX?()?+?"?,?"?+?e.getY?());

}

}

@Override

public?void?mouseDragged?(?MouseEvent?e?)

{

if?(mdp.left)

{

mdp.endX?=?e.getX?();

mdp.endY?=?e.getY?();

mdp.paintComponents?(mdp.getGraphics?());

mdp.startX?=?mdp.endX;

mdp.startY?=?mdp.endY;

endR.setText?(mdp.endX?+?"?,?"?+?mdp.endY);

}

}

});

mdp.addMouseListener?(new?MouseAdapter?()

{

@Override

public?void?mousePressed?(?MouseEvent?e?)

{

if?(e.getButton?()?==?MouseEvent.BUTTON1)

{

mdp.startX?=?e.getX?();

mdp.startY?=?e.getY?();

startR.setText?(mdp.startX?+?"?,?"?+?mdp.startY);

mdp.left?=?true;

}

else

{

mdp.left?=?false;

}

}

@Override

public?void?mouseReleased?(?MouseEvent?e?)

{

if?(mdp.left)

{

endR.setText?(e.getX?()?+?"?,?"?+?e.getY?());

}

}

});

mdp.setVisible?(true);

}

}

實(shí)現(xiàn)鼠標(biāo)畫(huà)圖的Java程序

import java awt Color;

import java awt Frame;

import java awt Graphics;

import java awt Point;

import java awt event MouseAdapter;

import java awt event MouseEvent;

import java awt event MouseListener;

import java util ArrayList;

import java util Iterator;

public class MyMouseAdapter {

public static void main(String[] args) {

new MyFrame ( drawing );

}

}

class MyFrame extends Frame{

ArrayList points=null;

MyFrame (String s){

super(s);

points=new ArrayList();

setLayout(null);

setBounds( );

this setBackground(new Color( ));

setVisible(true);

this addMouseListener(new Monitor ());

}

public void paint(Graphics g){

Iterator i=erator();

while(i hasNext()){

Point p=(Point)i next();

g setColor(Color blue);

g fillOval(p x p y );

}

}

public void addPoint(Point p){

points add(p);

}

}

class Monitor extends MouseAdapter{ //MouseAdapter實(shí)現(xiàn)了MouseListener接口

public void mousePressed(MouseEvent e){

MyFrame f=(MyFrame )e getSource();

f addPoint(new Point(e getX() e getY()));

f repaint(); //讓Frame強(qiáng)制經(jīng)行重畫(huà)

}

lishixinzhi/Article/program/Java/hx/201311/26376

實(shí)現(xiàn)java程序，要求單擊鼠標(biāo)畫(huà)線(xiàn)，雙擊鼠標(biāo)擦除所有畫(huà)的線(xiàn)。

package?zhidao;

import?java.awt.BorderLayout;

import?java.awt.Color;

import?java.awt.FlowLayout;

import?java.awt.Frame;

import?java.awt.Graphics;

import?java.awt.Label;

import?java.awt.Panel;

import?java.awt.event.MouseAdapter;

import?java.awt.event.MouseEvent;

import?java.awt.event.MouseMotionListener;

import?java.awt.event.WindowAdapter;

import?java.awt.event.WindowEvent;

public?class?MouseDrawPanel?extends?Frame

{

private?static?final?long?serialVersionUID?=?1L;

MouseEvent?e?=?null;

static?int?startX?=?-1;

static?int?startY?=?-1;

static?int?endX?=?-1;

static?int?endY?=?-1;

public?MouseDrawPanel?(?String?title?)

{

setTitle?(title);

setLayout?(new?BorderLayout?());

setResizable?(false);

setSize?(500,?400);

setLocationRelativeTo?(null);

addWindowListener?(new?WindowAdapter?()

{

@Override

public?void?windowClosing?(?WindowEvent?e?)

{

System.exit?(0);

}

});

}

@Override

public?void?paintComponents?(?Graphics?g?)

{

g.setColor?(Color.RED);

g.drawLine?(startX,?startY,?endX,?endY);

g.dispose?();

}

public?static?void?main?(?String[]?args?)

{

final?MouseDrawPanel?mdp?=?new?MouseDrawPanel?("Use?Mouse?Draw");

Panel?panel?=?new?Panel?();

panel.setLayout?(new?FlowLayout?(FlowLayout.LEFT));

Label?startL?=?new?Label?("start:?");

Label?endL?=?new?Label?("end:?");

final?Label?nowL?=?new?Label?("now:?");

final?Label?startR?=?new?Label?("000,000");

final?Label?endR?=?new?Label?("000,000");

final?Label?nowN?=?new?Label?("000,000");

panel.add?(startL);

panel.add?(startR);

panel.add?(endL);

panel.add?(endR);

panel.add?(nowL);

panel.add?(nowN);

mdp.add?(panel,?"South");

mdp.addMouseMotionListener?(new?MouseMotionListener?()

{

@Override

public?void?mouseMoved?(?MouseEvent?e?)

{

nowN.setText?(e.getX?()?+?"?,?"?+?e.getY?());

}

@Override

public?void?mouseDragged?(?MouseEvent?e?)

{

endX?=?e.getX?();

endY?=?e.getY?();

mdp.paintComponents?(mdp.getGraphics?());

startX?=?endX;

startY?=?endY;

endR.setText?(endX?+?"?,?"?+?endY);

}

});

mdp.addMouseListener?(new?MouseAdapter?()

{

@Override

public?void?mousePressed?(?MouseEvent?e?)

{

startX?=?e.getX?();

startY?=?e.getY?();

startR.setText?(startX?+?"?,?"?+?startY);

}

@Override

public?void?mouseReleased?(?MouseEvent?e?)

{

endR.setText?(e.getX?()?+?"?,?"?+?e.getY?());

}

});

mdp.setVisible?(true);

}

}

java 繪圖板 如何實(shí)現(xiàn)畫(huà)直線(xiàn)的功能

這個(gè)簡(jiǎn)單

可以調(diào)用方法drawline(int x1, int y1, int x2, int y2)

其中(x1, y1), (x2, y2)分別為直線(xiàn)起點(diǎn)和終點(diǎn)的坐標(biāo)

特意給你寫(xiě)了個(gè)小例子，希望能幫到你

***************************************

import javax.swing.*;

import java.awt.*;

public class DrawLine extends JPanel {

public static void main(String[] args) {

JFrame frame = new JFrame("DrawLine");

frame.getContentPane().add(new DrawLine());

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setSize(300, 200);

frame.setVisible(true);

}

protected void paintComponent(Graphics g) {

super.paintComponent(g);

g.drawLine(50, 50, 200, 250);

}

}

****************************

將程序復(fù)制到記事本中并改名為DrawLine.java(注意大小寫(xiě))

然后在命令行中用 CD＋文件夾 使命令范圍到DrawLine.java的文件夾中

然后執(zhí)行命令javac DrawLine.java

再執(zhí)行命令java DrawLine

你會(huì)看到結(jié)果

小弟菜鳥(niǎo)一枚java鼠標(biāo)跟隨問(wèn)題，我想讓下面代碼在鼠標(biāo)“快速”移動(dòng)時(shí)畫(huà)完整的線(xiàn)，不是斷斷續(xù)續(xù)的喲！

import?java.awt.Color;

import?java.awt.Graphics;

import?java.awt.event.MouseAdapter;

import?java.awt.event.MouseEvent;

import?java.awt.event.MouseMotionAdapter;

import?javax.swing.JFrame;

public?class?MouseDrawLine?extends?JFrame?{

int?x,?y;

int?endX,?endY;

public?MouseDrawLine()?{

addMouseListener(new?MouseAdapter()?{

//鼠標(biāo)下壓事件

@Override

public?void?mousePressed(MouseEvent?e)?{

x?=?e.getX();

y?=?e.getY();

}

//鼠標(biāo)彈起事件

@Override

public?void?mouseReleased(MouseEvent?e)?{

System.out.println("鼠標(biāo)彈起事件");

}

});

addMouseMotionListener(new?MouseMotionAdapter()?{

//鼠標(biāo)下壓移動(dòng)事件

@Override

public?void?mouseDragged(MouseEvent?e)?{

Graphics?g?=?getGraphics();

g.setColor(Color.BLACK);

endX?=?e.getX();

endY?=?e.getY();

g.drawLine(x,?y,?endX,?endY);

x?=?endX;

y?=?endY;

}

});

setSize(600,?500);

setLocation(200,100);

setVisible(true);

setDefaultCloseOperation(3);

}

public?static?void?main(String[]?args)?{

new?MouseDrawLine();

}

}