谁能给一个拖动鼠标画直线的关键代码 万分感激 谁能给一个拖动鼠标画直线的关键代码 万分感激 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 import javax.swing.*;import java.awt.*;import java.awt.event.*;public class DrawLine extends JFrame{ Point p1; Point p2; public DrawLine(){ setSize(400,300); LinePanel pane = new LinePanel(); pane.addMouseListener(pane); setContentPane(pane); setVisible(true); } public static void main(String[] args){ DrawLine myDrawLine = new DrawLine(); }}class LinePanel extends JPanel implements MouseListener{ Point p1; Point p2; public void paintComponent(Graphics g){ Graphics2D g2D = (Graphics2D) g; g2D.drawLine(p1.x, p1.y, p2.x, p2.y); } public void mousePressed(MouseEvent evt){ p1 = evt.getPoint(); } public void mouseReleased(MouseEvent evt){ p2 = evt.getPoint(); repaint(); } public void mouseClicked(MouseEvent evt){} public void mouseEntered(MouseEvent evt){} public void mouseExited(MouseEvent evt){}} 参考core java v1,献丑!import java.awt.event.*;import javax.swing.*;import java.awt.*;import java.util.*;import java.awt.geom.*;public class LineTest{ public static void main(String args[]) { LineFrame frame = new LineFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); }};class LineFrame extends JFrame{ public LineFrame() { setTitle("LineTest"); setSize(300,400); LinePanel panel = new LinePanel(); Container con=getContentPane(); con.add(panel); } };class LinePanel extends JPanel{ public LinePanel() { super(); linearray = new ArrayList(); addMouseListener(new MouseAdapter() { public void mousePressed(MouseEvent e) { linearray.clear(); linearray.add(e.getPoint()); linearray.add(e.getPoint()); } }); addMouseMotionListener(new MouseMotionAdapter() { public void mouseDragged(MouseEvent e) { linearray.add(e.getPoint()); repaint(); } }); } public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2 = (Graphics2D)g; for (int i = 0; i < linearray.size()-1; i++) g2.drawLine((int)(((Point)(linearray.get(i))).getX()), (int)(((Point)(linearray.get(i))).getY()), (int)(((Point)(linearray.get(i+1))).getX()), (int)(((Point)(linearray.get(i+1))).getY())); } private ArrayList linearray;}; import java.awt.*;import java.awt.event.*;public class MousePaint extends Frame implements MouseListener{ static MousePaint frm=new MousePaint (); static int x1=0,x2=0,y1=0,y2=0; public static void main(String args[]) { frm.setTitle("鼠标作图"); frm.setSize(200,150); frm.addMouseListener(frm); frm.setVisible(true); } public void mouseEntered(MouseEvent e) { } public void mouseClicked(MouseEvent e) { } public void mouseExited(MouseEvent e) { } public void mousePressed(MouseEvent e) { x1=e.getX(); y1=e.getY(); } public void mouseReleased(MouseEvent e) { x2=e.getX(); y2=e.getY(); repaint(); } public void paint(Graphics g) { g.setColor(Color.blue); g.drawLine(x1,y1,x2,y2); }} java.lang.ClassNotFoundException: com.chat.common.User错误,求大神帮忙看看 java解析xml的问题 一个java模拟的网球输赢概率题目,求解过程中遇到怪异现象 类可能未被初始化 分布式计算的课题_老老鸟请进! Applet从html文件中读取参数内容 ????? 紧急提问!!!高分相送 请熟悉Java与Oracle的大侠进来:) xiaoxi777(小溪):请教你刚才的问题 学习的迷茫 那位老大用过Jython,请教一个中文的问题。谢谢! 请熟悉JAVA3D和VRML的高手指点!
import java.awt.*;
import java.awt.event.*;public class DrawLine extends JFrame{
Point p1;
Point p2;
public DrawLine(){
setSize(400,300);
LinePanel pane = new LinePanel();
pane.addMouseListener(pane);
setContentPane(pane);
setVisible(true);
}
public static void main(String[] args){
DrawLine myDrawLine = new DrawLine();
}
}
class LinePanel extends JPanel implements MouseListener{
Point p1;
Point p2;
public void paintComponent(Graphics g){
Graphics2D g2D = (Graphics2D) g;
g2D.drawLine(p1.x, p1.y, p2.x, p2.y);
}
public void mousePressed(MouseEvent evt){
p1 = evt.getPoint();
}
public void mouseReleased(MouseEvent evt){
p2 = evt.getPoint();
repaint();
}
public void mouseClicked(MouseEvent evt){}
public void mouseEntered(MouseEvent evt){}
public void mouseExited(MouseEvent evt){}
}
import javax.swing.*;
import java.awt.*;
import java.util.*;
import java.awt.geom.*;public class LineTest
{
public static void main(String args[])
{
LineFrame frame = new LineFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
};class LineFrame extends JFrame
{
public LineFrame()
{
setTitle("LineTest");
setSize(300,400);
LinePanel panel = new LinePanel();
Container con=getContentPane();
con.add(panel);
}
};class LinePanel extends JPanel
{
public LinePanel()
{
super();
linearray = new ArrayList();
addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
linearray.clear();
linearray.add(e.getPoint());
linearray.add(e.getPoint());
}
}); addMouseMotionListener(new MouseMotionAdapter()
{
public void mouseDragged(MouseEvent e)
{
linearray.add(e.getPoint());
repaint();
}
});
} public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
for (int i = 0; i < linearray.size()-1; i++)
g2.drawLine((int)(((Point)(linearray.get(i))).getX()),
(int)(((Point)(linearray.get(i))).getY()),
(int)(((Point)(linearray.get(i+1))).getX()),
(int)(((Point)(linearray.get(i+1))).getY()));
}
private ArrayList linearray;
};
import java.awt.event.*;
public class MousePaint extends Frame implements MouseListener
{
static MousePaint frm=new MousePaint ();
static int x1=0,x2=0,y1=0,y2=0;
public static void main(String args[])
{
frm.setTitle("鼠标作图");
frm.setSize(200,150);
frm.addMouseListener(frm);
frm.setVisible(true);
}
public void mouseEntered(MouseEvent e) { }
public void mouseClicked(MouseEvent e) { }
public void mouseExited(MouseEvent e) { }
public void mousePressed(MouseEvent e) { x1=e.getX(); y1=e.getY(); }
public void mouseReleased(MouseEvent e) { x2=e.getX(); y2=e.getY(); repaint(); }
public void paint(Graphics g)
{
g.setColor(Color.blue);
g.drawLine(x1,y1,x2,y2);
}
}