📄 draw.java
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import java.awt.*;
import java.awt.event.*;
import java.text.DateFormat;
import java.util.*;
import javax.swing.*;
import javax.swing.JColorChooser;
public class draw extends Frame implements WindowListener,ActionListener,MouseListener,ItemListener,MouseMotionListener
{
MenuBar mb;
Menu me,mp,mh,mpl,mp2,me2;
MenuItem me1,yanse,xianxing,xiankuan,mp3;
Panel p0,p1,p2,p3;
static Color col=Color.black,cc=Color.red;
Choice c1,c2,c3;
Label prompt1,prompt2,prompt3,lable1,lable2,lable3;
Button b14,button1,button2,button3;
static int A,B,C,D,x0=0,x1=0,y0=0,y1=0,width,height,p=11,q=0,x_0,x_1,y_0,y_1;
int linestyle=0xffff,x00=0,x01=0,y00=0,y01=0;
int point=1,flag=0,r=0;
Dimension D1;
Toolkit TK;
boolean isXOR=false;//用于确定写模式，true为异或模式，false为写模式
static Graphics g;
Image buffer;
int first=0;
TextField txt1,txt2,txt3,txt4,txt5;
Dialog dialog1,dialog2,dialog3;
TextArea te;
public void display()
{ //获取屏幕的宽度和高度
TK=Toolkit.getDefaultToolkit();
D1=TK.getScreenSize();
//设置标题栏和窗口的大小
setTitle("绘图系统");
setSize(D1.width,D1.height);
width=D1.width;
height=D1.height;
//为窗口添加事件监听器
addWindowListener(this);
addMouseListener(this);
addMouseMotionListener(this);
//菜单
mb=new MenuBar();
setMenuBar(mb);
//mf=new Menu("文件");
me=new Menu("编辑");
mp=new Menu("绘图");
mh=new Menu("帮助");
mb.add(mp);
mb.add(me);
mb.add(mh);
//绘图下面的子菜单
mpl=new Menu("画直线");
mp.add(mpl);
mpl.add(new MenuItem("DDA画线"));
mpl.add(new MenuItem("中点画线"));
mpl.add(new MenuItem("Bresenham画线"));
mpl.addActionListener(this);
mp2=new Menu("画圆");
mp.add(mp2);
mp2.add(new MenuItem("公式法画圆"));
mp2.add(new MenuItem("多边形逼近圆"));
mp2.add(new MenuItem("中点画圆"));
mp2.addActionListener(this);
mp3=new MenuItem("填充");
mp3.addActionListener(this);
mp.add(mp3);
//编辑下面的子菜单
me1 =new MenuItem("清屏");//清屏子菜单
me.add(me1);
me1.addActionListener(this);
p0=new Panel();//画板
p0.setBackground(Color.pink);
prompt1=new Label("颜色");
prompt2=new Label("线型");
prompt3=new Label("线宽");
//颜色
c1=new Choice();
c1.addItem("灰");
c1.addItem("黑");
c1.addItem("红");
c1.addItem("粉红");
c1.addItem("黄");
c1.addItem("绿");
c1.addItem("蓝");
c1.addItem("自定义");
c1.select("黑");
//线型
c2=new Choice();
c2.addItem("___________");
c2.addItem("__ __ __ ");
c2.addItem("_ _ _ _ _ _");
c2.addItem("___.___.___");
c2.addItem("自定义");
//线宽
c3=new Choice();
c3.addItem("1");
c3.addItem("2");
c3.addItem("3");
c3.addItem("自定义");
p0.add(prompt1); p0.add(c1);
p0.add(prompt2); p0.add(c2);
p0.add(prompt3); p0.add(c3);
add(p0,BorderLayout.NORTH);
c1.addItemListener(this);
c2.addItemListener(this);
c3.addItemListener(this);
setVisible(true);
g=this.getGraphics();//画笔初始化
buffer=this.createImage(width,height);//创建缓冲区的大小
}//display
//实现接口ActionListener的所有方法，用于处理发生在菜单上的事件
public void actionPerformed(ActionEvent e)
{
isXOR=false;
if(e.getActionCommand()=="清屏")
{ buffer=this.createImage(width,height);//创建缓冲区的大小
g.drawImage(buffer,0,0,this);
}
if(e.getActionCommand()=="DDA")p=11;
if(e.getActionCommand()=="中点画线")p=12;
if(e.getActionCommand()=="Bresenham画线")p=13;
if(e.getActionCommand()=="公式法画圆") p=21; ;
if(e.getActionCommand()=="多边形逼近圆") p=22;
if(e.getActionCommand()=="中点画圆") p=23;
if(e.getActionCommand()=="填充") p=3;
} //actionPerformed
//将数字字符串转换为数字
public long ToData(String s)
{
int k=s.length();
long data=s.charAt(0)-48;//charAt:返回指定位置的字符
for(int i=1;i<=k-1;i++)
{
data=10*data+s.charAt(i)-48;
}
return data;
}
//实现接口WindowListener的所有方法，用于处理发生在窗口上的事件
public void windowClosing(WindowEvent e)
{
System.exit(0);
}//windowClosing
public void windowOpened(WindowEvent e){ }
public void windowDeactivated(WindowEvent e){}
public void windowClosed(WindowEvent e){}
public void windowIconified(WindowEvent e){}
public void windowDeiconified(WindowEvent e){}
public void windowActivated(WindowEvent e){}
//实现接口ItemListener的所有方法，用于处理发生在选择框上的事件
public void itemStateChanged(ItemEvent e)
{
if(e.getSource()==c1)//颜色
switch(c1.getSelectedIndex())
{
case 0:col=Color.gray;cc=col;break;
case 1:col=Color.black;cc=col;break;
case 2:col=Color.red;cc=col;break;
case 3:col=Color.pink;cc=col;break;
case 4:col=Color.yellow;cc=col;break;
case 5:col=Color.green;cc=col;break;
case 6:col=Color.blue;cc=col;break;
case 7:{Color col= JColorChooser.showDialog(te, "字体颜色", Color.BLACK);
cc=col;break;}
}
if(e.getSource()==c3)//线宽
{
String inpute=JOptionPane.showInputDialog(this,"please input xiankuan");
point=(int)(ToData(inpute));
}
if(e.getSource()==c2)//线型
switch(c2.getSelectedIndex())
{
case 0:linestyle=0xffff;break;
case 1:linestyle=0xff00;break;
case 2:linestyle=0xf0f0;break;
case 3:linestyle=0x6f6f;break;
case 4:{String input=JOptionPane.showInputDialog(this,"please input xianxing");
linestyle=(int)(ToData(input));
break;}
}//if
}//itemStateChanged
//实现接口MouseListener的所有方法（5个），用于处理鼠标事件
public void mousePressed(MouseEvent e)
{
x0=e.getX();
y0=e.getY();
x_0=x0;//起始点坐标
y_0=y0;
}//mousePressed
public void mouseReleased(MouseEvent e)
{
int m,n,r=0;
isXOR=false;
x1=e.getX();
y1=e.getY();
x_1=x1;//终止点坐标
y_1=y1;
x01=0;
y01=0;
x00=0;
y00=0;
flag=0;
if(p==11)//DDA
(new DrawLine()).DDALine(this.g,this.buffer,col,linestyle,point,x0,y0,x1,y1,isXOR);
if(p==12)//中点画线
{
(new DrawLine()).midLine(this.g,this.buffer,col,linestyle,point,x0,y0,x1,y1,isXOR);}
if(p==13)//bresenham画线
{
(new DrawLine()).BresenhamLine(this.g,this.buffer,col,linestyle,point,x0,y0,x1,y1,isXOR);}
if(p==21)//公式法画圆
{r=(int)(Math.sqrt(Math.abs(x1-x0)*Math.abs(x1-x0)+Math.abs(y1-y0)*Math.abs(y1-y0))+0.5);
(new DrawCircle()).midCircle1(this.g,this.buffer,col,linestyle,point,x0,y0,r);}
if(p==22)//多边形逼近圆
{r=(int)(Math.sqrt(Math.abs(x1-x0)*Math.abs(x1-x0)+Math.abs(y1-y0)*Math.abs(y1-y0))+0.5);
(new DrawCircle()).midCircle2(this.g,this.buffer,col,linestyle,point,x0,y0,r);}
if(p==23)//中点画圆
{r=(int)(Math.sqrt(Math.abs(x1-x0)*Math.abs(x1-x0)+Math.abs(y1-y0)*Math.abs(y1-y0))+0.5);
(new DrawCircle()).midCircle3(this.g,this.buffer,col,linestyle,point,x0,y0,r);}
if(p==3)//填充图形
{
Fill fill=new Fill();
fill.fill_area(this,x1,y1,col);
}
}//mouseReleased
public void mouseClicked(MouseEvent e){ }
public void mouseEntered(MouseEvent e) { }
public void mouseExited(MouseEvent e) { }
//实现接口MouseMotionListener的所有方法(2个)，用于处理鼠标的拖拽和移动事件
public void mouseDragged(MouseEvent e) //实现橡皮筋技术
{
isXOR=true;
if(flag==0)//flag用于区别相邻的两次拖拽
{
x00=e.getX();
y00=e.getY();
flag++;
if(x01!=0&&y01!=0)
(new DrawLine()).DDALine(g,buffer,cc,0xf0f0,1,x0,y0,x01,y01,isXOR); //画旧的直线
(new DrawLine()).DDALine(g,buffer,col,linestyle,1,x0,y0,x00,y00,isXOR); //画新的直线
}
if(flag==1)
{
x01=e.getX();
y01=e.getY();
flag--;
(new DrawLine()).DDALine(g,buffer,cc,0xf0f0,1,x0,y0,x00,y00,isXOR); //消除旧的直线
(new DrawLine()).DDALine(g,buffer,col,linestyle,1,x0,y0,x01,y01,isXOR);//画新的直线
}
}//mouseDragged
public void mouseMoved(MouseEvent e){ }
//用于显示
public void paint(Graphics g)
{
if(first==0) //初始化缓冲区
{
buffer=this.createImage(width,height);
first=1;
}
g.drawImage(buffer,0,0,this);
}
/****main*/
public static void main(String args[])
{
draw f= new draw();
f.display();
}
}
//定义直线类
class DrawLine
{
public void DDALine( Graphics g,Image buffer,Color c,int linestyle,int point,int xu0,int yu0,int xu1,int yu1,boolean isXOR) //DDA算法
{
int mark=0x8000,n=0;
float increx,increy,x,y,length;
int i,j;
if(Math.abs(xu1-xu0)>Math.abs(yu1-yu0))
length=Math.abs(xu1-xu0);
else length=Math.abs(yu1-yu0);
increx=(xu1-xu0)/length;
increy=(yu1-yu0)/length;
x=xu0;
y=yu0;
/*在屏幕上画*/
if(isXOR) g.setXORMode(c);
else
{
g.setPaintMode();
g.setColor(c);
}
for(i=1;i<=length;i++)
{
n++;
if(n%16>1) mark=0x8000>>(n%16-1);
if(n%16==1) mark=0x8000;
if(n%16==0) mark=0x0001;
if((linestyle & mark)!=0)
if(length==Math.abs(xu1-xu0))
switch(point)
{
case 1: g.fillOval((int)Math.round(x+0.5),(int)Math.round(y+0.5),1,1);
break;
case 2: g.fillOval((int)Math.round(x+0.5),(int)Math.round(y+0.5),1,1);
g.fillOval((int)Math.round(x+0.5),(int)Math.round(y+0.5)+1,1,1);
break;
case 3: g.fillOval((int)Math.round(x+0.5),(int)Math.round(y+0.5),1,1);
g.fillOval((int)Math.round(x+0.5),(int)Math.round(y+0.5)-1,1,1);
g.fillOval((int)Math.round(x+0.5),(int)Math.round(y+0.5)+1,1,1);
break;
case 4: {if(point%2==0){
for(j=0;j<=j/2;j++)
g.fillOval((int)Math.round(x+0.5),(int)Math.round(y+0.5)+j,1,1);
g.fillOval((int)Math.round(x+0.5),(int)Math.round(y+0.5)-j+1,1,1);}
else {for(j=0;j<=j/2;j++)
g.fillOval((int)Math.round(x+0.5),(int)Math.round(y+0.5)+j,1,1);
g.fillOval((int)Math.round(x+0.5),(int)Math.round(y+0.5)-j,1,1);}
break;
}
}
else
switch(point)
{
case 1: g.fillOval((int)Math.round(x+0.5),(int)Math.round(y+0.5),1,1);
break;
case 2: g.fillOval((int)Math.round(x+0.5),(int)Math.round(y+0.5),1,1);
g.fillOval((int)Math.round(x+0.5)+1,(int)Math.round(y+0.5),1,1);
break;
case 3: g.fillOval((int)Math.round(x+0.5),(int)Math.round(y+0.5),1,1);
g.fillOval((int)Math.round(x+0.5)-1,(int)Math.round(y+0.5),1,1);
g.fillOval((int)Math.round(x+0.5)+1,(int)Math.round(y+0.5),1,1);
break;
case 4: {if(point%2==0){
for(j=0;j<=j/2;j++)
g.fillOval((int)Math.round(x+0.5),(int)Math.round(y+0.5)+j,1,1);
g.fillOval((int)Math.round(x+0.5),(int)Math.round(y+0.5)-j+1,1,1);}
else {for(j=0;j<=j/2;j++)
g.fillOval((int)Math.round(x+0.5),(int)Math.round(y+0.5)+j,1,1);
g.fillOval((int)Math.round(x+0.5),(int)Math.round(y+0.5)-j,1,1);}
break;}
}
x=x+increx;
y=y+increy;
}
/*在缓冲区中画*/
mark=0x8000;n=0;
x=xu0;
y=yu0;
g=buffer.getGraphics();
if(isXOR) g.setXORMode(c);
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