javajframe圓角

A. java實現簡單的畫圖板

樓主寫一個html，很容易把下面代碼嵌入到applet，可以google一下實現，
還有自己不知道算不算復制。。。-_-!
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樓主給你一個我的，直接保存成pb.java編譯運行，就是你要的畫圖功能 ，可以參考一下
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import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import java.awt.geom.*;
import java.io.*;

class Point implements Serializable
{
int x,y;
Color col;
int tool;
int boarder;

Point(int x, int y, Color col, int tool, int boarder)
{
this.x = x;
this.y = y;
this.col = col;
this.tool = tool;
this.boarder = boarder;
}
}

class paintboard extends Frame implements ActionListener,MouseMotionListener,MouseListener,ItemListener
{
int x = -1, y = -1;
int con = 1;//畫筆大小
int Econ = 5;//橡皮大小

int toolFlag = 0;//toolFlag:工具標記
//toolFlag工具對應表：
//（0--畫筆）；（1--橡皮）；（2--清除）；
//（3--直線）；（4--圓）；（5--矩形）；

Color c = new Color(0,0,0); //畫筆顏色
BasicStroke size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);//畫筆粗細
Point cutflag = new Point(-1, -1, c, 6, con);//截斷標志

Vector paintInfo = null;//點信息向量組
int n = 1;

FileInputStream picIn = null;
FileOutputStream picOut = null;

ObjectInputStream VIn = null;
ObjectOutputStream VOut = null;

// *工具面板--畫筆，直線，圓，矩形，多邊形,橡皮，清除*/
Panel toolPanel;
Button eraser, drLine,drCircle,drRect;
Button clear ,pen;
Choice ColChoice,SizeChoice,EraserChoice;
Button colchooser;
Label 顏色,大小B,大小E;
//保存功能
Button openPic,savePic;
FileDialog openPicture,savePicture;

paintboard(String s)
{
super(s);
addMouseMotionListener(this);
addMouseListener(this);

paintInfo = new Vector();

/*各工具按鈕及選擇項*/
//顏色選擇
ColChoice = new Choice();
ColChoice.add("black");
ColChoice.add("red");
ColChoice.add("blue");
ColChoice.add("green");
ColChoice.addItemListener(this);
//畫筆大小選擇
SizeChoice = new Choice();
SizeChoice.add("1");
SizeChoice.add("3");
SizeChoice.add("5");
SizeChoice.add("7");
SizeChoice.add("9");
SizeChoice.addItemListener(this);
//橡皮大小選擇
EraserChoice = new Choice();
EraserChoice.add("5");
EraserChoice.add("9");
EraserChoice.add("13");
EraserChoice.add("17");
EraserChoice.addItemListener(this);
////////////////////////////////////////////////////
toolPanel = new Panel();

clear = new Button("清除");
eraser = new Button("橡皮");
pen = new Button("畫筆");
drLine = new Button("畫直線");
drCircle = new Button("畫圓形");
drRect = new Button("畫矩形");

openPic = new Button("打開圖畫");
savePic = new Button("保存圖畫");

colchooser = new Button("顯示調色板");

//各組件事件監聽
clear.addActionListener(this);
eraser.addActionListener(this);
pen.addActionListener(this);
drLine.addActionListener(this);
drCircle.addActionListener(this);
drRect.addActionListener(this);
openPic.addActionListener(this);
savePic.addActionListener(this);
colchooser.addActionListener(this);

顏色 = new Label("畫筆顏色",Label.CENTER);
大小B = new Label("畫筆大小",Label.CENTER);
大小E = new Label("橡皮大小",Label.CENTER);
//面板添加組件
toolPanel.add(openPic);
toolPanel.add(savePic);

toolPanel.add(pen);
toolPanel.add(drLine);
toolPanel.add(drCircle);
toolPanel.add(drRect);

toolPanel.add(顏色); toolPanel.add(ColChoice);
toolPanel.add(大小B); toolPanel.add(SizeChoice);
toolPanel.add(colchooser);

toolPanel.add(eraser);
toolPanel.add(大小E); toolPanel.add(EraserChoice);

toolPanel.add(clear);
//工具面板到APPLET面板
add(toolPanel,BorderLayout.NORTH);

setBounds(60,60,900,600); setVisible(true);
validate();
//dialog for save and load

openPicture = new FileDialog(this,"打開圖畫",FileDialog.LOAD);
openPicture.setVisible(false);
savePicture = new FileDialog(this,"保存圖畫",FileDialog.SAVE);
savePicture.setVisible(false);

openPicture.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{ openPicture.setVisible(false); }
});

savePicture.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{ savePicture.setVisible(false); }
});

addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{ System.exit(0);}
});

}

public void paint(Graphics g)
{
Graphics2D g2d = (Graphics2D)g;

Point p1,p2;

n = paintInfo.size();

if(toolFlag==2)
g.clearRect(0,0,getSize().width,getSize().height);//清除

for(int i=0; i<n ;i++){
p1 = (Point)paintInfo.elementAt(i);
p2 = (Point)paintInfo.elementAt(i+1);
size = new BasicStroke(p1.boarder,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);

g2d.setColor(p1.col);
g2d.setStroke(size);

if(p1.tool==p2.tool)
{
switch(p1.tool)
{
case 0://畫筆

Line2D line1 = new Line2D.Double(p1.x, p1.y, p2.x, p2.y);
g2d.draw(line1);
break;

case 1://橡皮
g.clearRect(p1.x, p1.y, p1.boarder, p1.boarder);
break;

case 3://畫直線
Line2D line2 = new Line2D.Double(p1.x, p1.y, p2.x, p2.y);
g2d.draw(line2);
break;

case 4://畫圓
Ellipse2D ellipse = new Ellipse2D.Double(p1.x, p1.y, Math.abs(p2.x-p1.x) , Math.abs(p2.y-p1.y));
g2d.draw(ellipse);
break;

case 5://畫矩形
Rectangle2D rect = new Rectangle2D.Double(p1.x, p1.y, Math.abs(p2.x-p1.x) , Math.abs(p2.y-p1.y));
g2d.draw(rect);
break;

case 6://截斷，跳過
i=i+1;
break;

default :
}//end switch
}//end if
}//end for
}

public void itemStateChanged(ItemEvent e)
{
if(e.getSource()==ColChoice)//預選顏色
{
String name = ColChoice.getSelectedItem();

if(name=="black")
{c = new Color(0,0,0); }
else if(name=="red")
{c = new Color(255,0,0);}
else if(name=="green")
{c = new Color(0,255,0);}
else if(name=="blue")
{c = new Color(0,0,255);}
}
else if(e.getSource()==SizeChoice)//畫筆大小
{
String selected = SizeChoice.getSelectedItem();

if(selected=="1")
{
con = 1;
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);

}
else if(selected=="3")
{
con = 3;
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);

}
else if(selected=="5")
{con = 5;
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);

}
else if(selected=="7")
{con = 7;
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);

}
else if(selected=="9")
{con = 9;
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);

}
}
else if(e.getSource()==EraserChoice)//橡皮大小
{
String Esize = EraserChoice.getSelectedItem();

if(Esize=="5")
{ Econ = 5*2; }
else if(Esize=="9")
{ Econ = 9*2; }
else if(Esize=="13")
{ Econ = 13*2; }
else if(Esize=="17")
{ Econ = 17*3; }

}

}

public void mouseDragged(MouseEvent e)
{
Point p1 ;
switch(toolFlag){
case 0://畫筆
x = (int)e.getX();
y = (int)e.getY();
p1 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p1);
repaint();
break;

case 1://橡皮
x = (int)e.getX();
y = (int)e.getY();
p1 = new Point(x, y, null, toolFlag, Econ);
paintInfo.addElement(p1);
repaint();
break;

default :
}
}

public void mouseMoved(MouseEvent e) {}

public void update(Graphics g)
{
paint(g);
}

public void mousePressed(MouseEvent e)
{
Point p2;
switch(toolFlag){
case 3://直線
x = (int)e.getX();
y = (int)e.getY();
p2 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p2);
break;

case 4: //圓
x = (int)e.getX();
y = (int)e.getY();
p2 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p2);
break;

case 5: //矩形
x = (int)e.getX();
y = (int)e.getY();
p2 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p2);
break;

default :
}
}

public void mouseReleased(MouseEvent e)
{
Point p3;
switch(toolFlag){
case 0://畫筆
paintInfo.addElement(cutflag);
break;

case 1: //eraser
paintInfo.addElement(cutflag);
break;

case 3://直線
x = (int)e.getX();
y = (int)e.getY();
p3 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p3);
paintInfo.addElement(cutflag);
repaint();
break;

case 4: //圓
x = (int)e.getX();
y = (int)e.getY();
p3 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p3);
paintInfo.addElement(cutflag);
repaint();
break;

case 5: //矩形
x = (int)e.getX();
y = (int)e.getY();
p3 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p3);
paintInfo.addElement(cutflag);
repaint();
break;

default:
}
}

public void mouseEntered(MouseEvent e){}

public void mouseExited(MouseEvent e){}

public void mouseClicked(MouseEvent e){}

public void actionPerformed(ActionEvent e)
{

if(e.getSource()==pen)//畫筆
{toolFlag = 0;}

if(e.getSource()==eraser)//橡皮
{toolFlag = 1;}

if(e.getSource()==clear)//清除
{
toolFlag = 2;
paintInfo.removeAllElements();
repaint();
}

if(e.getSource()==drLine)//畫線
{toolFlag = 3;}

if(e.getSource()==drCircle)//畫圓
{toolFlag = 4;}

if(e.getSource()==drRect)//畫矩形
{toolFlag = 5;}

if(e.getSource()==colchooser)//調色板
{
Color newColor = JColorChooser.showDialog(this,"調色板",c);
c = newColor;
}

if(e.getSource()==openPic)//打開圖畫
{

openPicture.setVisible(true);

if(openPicture.getFile()!=null)
{
int tempflag;
tempflag = toolFlag;
toolFlag = 2 ;
repaint();

try{
paintInfo.removeAllElements();
File filein = new File(openPicture.getDirectory(),openPicture.getFile());
picIn = new FileInputStream(filein);
VIn = new ObjectInputStream(picIn);
paintInfo = (Vector)VIn.readObject();
VIn.close();
repaint();
toolFlag = tempflag;

}

catch(ClassNotFoundException IOe2)
{
repaint();
toolFlag = tempflag;
System.out.println("can not read object");
}
catch(IOException IOe)
{
repaint();
toolFlag = tempflag;
System.out.println("can not read file");
}
}

}

if(e.getSource()==savePic)//保存圖畫
{
savePicture.setVisible(true);
try{
File fileout = new File(savePicture.getDirectory(),savePicture.getFile());
picOut = new FileOutputStream(fileout);
VOut = new ObjectOutputStream(picOut);
VOut.writeObject(paintInfo);
VOut.close();
}
catch(IOException IOe)
{
System.out.println("can not write object");
}

}
}
}//end paintboard

public class pb
{
public static void main(String args[])
{ new paintboard("畫圖程序"); }
}

B. java fillroundrect畫出來的圓角右上&下&左下為什麼沒能畫完

這是java自身的原因，不是你的原因，java無法精細的畫出你指定的圖形，畢竟不是專業的繪圖軟體，對圖形沒有過高的要求（這就是不用java做手機的原因）。

C. 用JAVA語言寫一個二維平面圖形(如長方形)的平移,旋轉,縮放的程序.

importjavax.swing.*;

importjava.awt.*;

importjava.awt.event.ActionEvent;

importjava.awt.geom.*;

/**

*@

*/

{

=newDimension(300,200);

=newDimension(1024,768);

=newDimension(600,400);

publicDimensiongetMaximumSize(){returnmaxSize;}

publicDimensiongetMinimumSize(){returnminSize;}

(){returnpreferredSize;}

publicStringgetTitle(){return"FrameTitle";}

privateAffineTransformaf=newAffineTransform();

privateStrokestroke=newBasicStroke(2.0f);

privateRectanglerct=newRectangle(40,140,200,140);

privateJComponentcanvas=newJComponent(){

protectedvoidpaintComponent(Graphicsg){

super.paintComponent(g);

g.setColor(Color.BLACK);

g.fillRect(0,0,getWidth(),getHeight());

Graphics2Dg2d=(Graphics2D)g.create();

g2d.setColor(Color.YELLOW);

g2d.setTransform(af);

g2d.setStroke(stroke);

g2d.draw(rct);

g2d.dispose();

}

};

RectTransform()throwsHeadlessException{

init();

doLay();

attachListeners();

}

privatevoidinit(){

}

privatevoiddoLay(){

Containercontainer=getContentPane();

JPanelpanel=newJPanel(newFlowLayout(FlowLayout.CENTER,30,5));

panel.add(newJButton(newAfAction("move",AffineTransform.getTranslateInstance(100,100))));

panel.add(newJButton(newAfAction("rotate",AffineTransform.getRotateInstance(Math.PI/3,40,120))));

panel.add(newJButton(newAfAction("zoomIn",AffineTransform.getScaleInstance(2,2))));

panel.add(newJButton(newAfAction("ZoomOut",AffineTransform.getScaleInstance(.5d,.5d))));

panel.add(newJButton(newAfAction("Original",newAffineTransform())));

container.add(panel,BorderLayout.NORTH);

container.add(canvas,BorderLayout.CENTER);

pack();

}

privatevoidattachListeners(){

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

{

privateAffineTransformaff;

privateAfAction(Stringn,AffineTransformaf){

super(n);

this.aff=af;

}

publicvoidactionPerformed(ActionEvente){

af.setTransform(aff);

if(canvas.isVisible())canvas.paintImmediately(0,0,getWidth(),getHeight());

}

}

publicstaticvoidmain(String[]args){

newRectTransform().setVisible(true);

}

}

D. Java JTabbedPane 用法

樓上在哪復制的啊？ 這么簡單用說那麼多嗎？

JTabbedPane jtbp1=new JTabbedPane();
JPanel jp1 = new JPanel();
// panel 里愛放啥放啥
JPanel jp2 = new JPanel();
// panel 里愛放啥放啥
jtbp1.add("學生資回料管理", jp1);
jtbp1.add("學生資料管理", jp2);
在生成 jFrame 時把答 this.add(jtbp1 ) , 進去就行了

E. Swing Jpanel實現圓角的問題

finalShapeshape=newRoundRectangle2D.Double(0d,0d,f.getWidth(),f.getHeight(),50,50);

f.addComponentListener(newComponentAdapter()
{

	publicvoidcomponentResized(ComponentEvente)
	{
		f.setShape(shape);
	}
});

上面這個能讓 JFrame 確實是圓角且透明，但不知為何這個 JPanel 的邊框繪制時依然不正確。