?? lsystem.java
字號:
package classes;
import java.awt.*;
import java.awt.event.*;
import java.util.Vector;
import java.util.Date;
import java.applet.Applet;
public class Lsystem extends Applet implements Runnable,ItemListener,ActionListener//主窗口
{
Thread runner;
boolean running;
boolean start;
int Count=0;
int R=0,G=0,B=0;
boolean colorLock=true;
int exampleChoice=1;//控制"圖例演示"中單選按鈕狀態
int startX=340;//起始點
int startY=20;
double initDirection=60;//作畫時的初始方向
double direction;//中間變量
double lengthF=3.3;//每步步長
double rotation=-3;//作圖中給定的轉角
int startDepth=7;//畫圖迭代次數
int Depth=0;
int ruleNumber=2;//規則數
String sStart;//公理；即所要畫的字符串
String sRule[][];//規則數組
doublePoint a, b;//畫線段的兩點,由類定義
Graphics g;
Choice choice1,choice2,choice3;
Button step;
Panel p;
public void init()
{
this.setLayout(new BorderLayout());
sRule=new String [6][2];
//初始化為"斜草"規則
sStart = "G";
sRule[0][0]="G";
sRule[0][1]="GFX[+++++GFG][-----GFG]";
sRule[1][0]="X";
sRule[1][1]="F-XF";
choice1=new Choice();
choice2=new Choice();
choice3=new Choice();
choice1.add("前景色");
choice1.add("背景色");
choice1.add("植物色");
choice2.add("開始繪畫");
choice2.add("圖例演示");
choice2.add("參數控制");
choice2.add("清除畫面");
choice3.add("關于L系統");
choice3.add("關于程序");
choice1.addItemListener(this);
choice2.addItemListener(this);
choice3.addItemListener(this);
step=new Button("單步迭代");
step.addActionListener(this);
p=new Panel();
p.setLayout(new FlowLayout());
p.add(new Label("顏色"));
p.add(choice1);
p.add(new Label("畫圖"));
p.add(choice2);
p.add(new Label("幫助"));
p.add(choice3);
p.add(step);
add(p,"South");
this.setSize(517,550);
reinit();
}
//從新初始化
public void reinit()
{
Depth=startDepth;
start=true;
running=false;
}
//獲取背景色
public Color getBackColor()
{
Color c=this.getBackground();
return c;
}
//獲取前景色
public Color getForeColor()
{
Color c=this.getForeground();
return c;
}
//設置背景色
public void setBackColor()
{
Color c=new Color(R,G,B);
this.setBackground(c);
}
//設置前景色
public void setForeColor()
{
Color c=new Color(R,G,B);
this.setForeground(c);
}
public void destroy()
{
if(runner!=null)
{
runner=null;
running=false;
}
}
public void start()
{
if (runner==null)
{
runner=new Thread(this);
runner.start();
}
}
public void stop()
{
if (runner!=null)
{
runner=null;
start=false;
running=false;
}
}
public void run()
{
while(true)
{
if(start)
{
start=false;
g=this.getGraphics();
g.clearRect(0,0,517,550);
a=new doublePoint(startX,startY); // 起始點
direction=initDirection; // 起始的方向
HuiHua(g, sStart, startDepth);
g.finalize();
running=false;
}
}
}
public void paint(Graphics g)
{
g=this.getGraphics();
if(!running)
{
start=true;
return;
}
else
{
return;
}
}
public void actionPerformed(ActionEvent ae)
{
if(ae.getSource()==step)
{
g=this.getGraphics();
g.clearRect(0,0,560,560);
a=new doublePoint(startX,startY); // 起始點
direction=initDirection;// 起始的方向
Count=0;
if(Depth==startDepth)
Depth=0;
HuiHua(g,sStart,(++Depth)%(startDepth+1));
}
}
public void itemStateChanged(ItemEvent ie)//各個子菜單按鈕的時間處理
{
if(ie.getItemSelectable()==choice1)
{
if(choice1.getSelectedIndex()==0)//“前景色”的處理
{
colorLock=false;
g=this.getGraphics();
g.clearRect(0,0,517,550);
Color_set fore_cs=new Color_set(this,"前景色",0);
fore_cs.setVisible(true);
}
if(choice1.getSelectedIndex()==1)//“背景色”的處理
{
g=this.getGraphics();
g.clearRect(0,0,517,550);
Color_set back_cs=new Color_set(this,"背景色",1);
back_cs.setVisible(true);
}
if(choice1.getSelectedIndex()==2)//“植物色”的處理
{
colorLock=true;
}
}
if(ie.getItemSelectable()==choice2)
{
if(choice2.getSelectedIndex()==0)//“開始繪畫”的處理
{
g=this.getGraphics();
a=new doublePoint(startX,startY); // 起始點
direction=initDirection;// 起始的方向
Count=0;
HuiHua(g,sStart,startDepth);
}
if(choice2.getSelectedIndex()==1)//“圖例演示”的處理
{
g=getGraphics();
g.clearRect(0,0,517,550);
Lexample ex=new Lexample(this,"圖例演示");
ex.setVisible(true);
}
if(choice2.getSelectedIndex()==2)//“參數控制”的處理
{
g=this.getGraphics();
g.clearRect(0,0,517,550);
Lcontrol lc=new Lcontrol(this,"參數控制");
lc.setVisible(true);
}
if(choice2.getSelectedIndex()==3)//“清除畫面”的處理
{
g=this.getGraphics();
g.clearRect(0,0,517,550);
}
}
if(ie.getItemSelectable()==choice3)
{
if(choice3.getSelectedIndex()==0)//“關于L系統”的處理
{
g=this.getGraphics();
g.clearRect(0,0,517,550);
AboutSystem as=new AboutSystem("關于L系統",1);
as.setVisible(true);
}
if(choice3.getSelectedIndex()==1)//“關于程序”的處理
{
g=this.getGraphics();
g.clearRect(0,0,517,550);
AboutPrograme ap=new AboutPrograme("關于程序");
ap.setVisible(true);
}
}
}
// 核心程序
public void HuiHua(Graphics g,String instruction, int depth)
{
if (depth==0)
return; //深度為0即表示可以開始畫了
depth -= 1;
//每遞歸一次深度減一
Vector aPoint = new Vector();//用堆棧記錄[]中的內容
Vector aDirection = new Vector();
String sDirection;
int i,j;
char c;
for (i=0;i<instruction.length();i++)
{
c = instruction.charAt(i); //獲取公理中的字符
// 開始遞歸
for(j=0;j<ruleNumber;j++)
{
if (c==sRule[j][0].charAt(0))
{
HuiHua(g,sRule[j][1],depth); //若找到公理符合規則則調用規則
break;
}
}
if (c=='F')
{
// 如果深度達到所設定的深度時即畫出線段
if (depth==0||j==ruleNumber)
{
if(colorLock)
{
if(Count>75)
Count=0;
g=this.getGraphics();
g.setColor(new Color(0,180+(75-Count++)%75,0));
}
double rad=2*Math.PI*direction/360;// 角度轉換
double p=lengthF * Math.cos(rad);
double q=lengthF * Math.sin(rad);
b = new doublePoint(a.x+p, a.y+q);
g.drawLine((int)(a.x), (int)(400-a.y), (int)(b.x) ,(int)(400-b.y));
a = b; // 前一線段的終點為后一線段的起始點
}
}
else if (c=='+') direction += rotation; //逆時針轉角度
else if (c=='-') direction -= rotation; //順時針轉角度
else if (c=='[')
{ //入棧
aPoint.addElement(a);
sDirection = String.valueOf(direction);
aDirection.addElement(sDirection);
}
else if (c==']')
{ //出棧
a=(doublePoint)(aPoint.elementAt(aPoint.size()-1));
sDirection=(String)(aDirection.elementAt(aDirection.size()-1));
direction=Double.valueOf(sDirection).doubleValue();
aPoint.removeElementAt(aPoint.size()-1);
aDirection.removeElementAt(aDirection.size()-1);
}
}
}
class doublePoint
{ //為保存雙精度的點而新建一個類
double x;
double y;
doublePoint(double x1,double y1)
{x=x1;y=y1;}
}
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