加工中的Knight Tour GUI

Question

我正在使用基本gui處理騎士的巡回問題，我想在兩個由（x，y）組成的文本字段中輸入用戶輸入，然后在一個文本框中輸入解決方案（如果可行），在另一個文本框中打印我寫了騎士采用的路徑。我的算法工作正常，我在gui中有問題。我為（x，y）給出了一些默認值，以便獲得正確的輸出。但是當我更改（x， y）在文本字段中，沒有任何更改。這是主文件，在其下還有另一個事件處理程序文件。將不勝感激您的幫助。我正在處理2.2.1，這是輸出屏幕的方式看起來像

主文件/project.pde

// Need G4P library
import g4p_controls.*;
Maxim maxim;
AudioPlayer player;
int x=-1;
int y=-1;
String solution="";
PImage img;
int count=0;

public void setup(){
  size(480, 320, JAVA2D);
  maxim=new Maxim(this);
  player=maxim.loadFile("song.wav");
  player.setLooping(true);

  img=loadImage("chess.jpg");

  createGUI();
  customGUI();

  // Place your setup code here

}
int t[]=new int[25];
boolean visited[][]=new boolean[5][5];
int check[][]=new int[5][5];
boolean b;
int counter=-1;
boolean move(int x,int y , int m){
 boolean result=false; 
   if (x<0 || x>=5 || y<0 || y>=5 || visited[x][y]==true)
   {
        return false;
   }

    visited[x][y]=true;

    if (m==24)
    {

        visited[x][y]=true;

        return true;
    }
    else
    {
      String xstring=String.valueOf(x);
      String ystring=String.valueOf(y);
      solution=solution+xstring+","+ystring+"  ";
        print (x);
        print(",");
        print(y);
        check[x][y]=counter+1;
        if (move(x+2,y+1,m+1) || move(x+2,y-1,m+1)
            || move(x-2,y+1,m+1) || move(x-2,y-1,m+1)
            || move(x+1,y+1,m+1) || move(x+1,y-1,m+1)
            || move(x-1,y+1,m+1) || move(x-1,y-1,m+1)){
            print (x);
            print(",");
            print(y);
            //check[x][y]=1;
            return true;

            }


    return false;


}
}


public void draw(){
 counter=counter+1; 
   background(0,128,128);
   image(img,0,0,480,320);
   player.play();
   textarea2.setText(solution);


   String txt1 = textfield1.getText();
   x = Integer.parseInt(txt1);

   String txt2 = textfield2.getText();
   y= Integer.parseInt(txt2);
   print(solution);
   if(x>=0 && y>=0)
   {
     b=move(x,y,0);


     if(b==false)
     {
       textarea1.setText("Solution is not possible,enter other coordinates");
     }
     if(b==true)
     {
       textarea1.setText("Congratulations solution is possible");
     }
   }
   if(count%8==0)
   {
     delay(1000);
     println(counter);

   }

}
void keyPressed()
{
  if (key==13)
  {
    solution="";
    print(solution);
    textarea2.setText(solution);
    String txt1 = textfield1.getText();
   x = Integer.parseInt(txt1);

   String txt2 = textfield2.getText();
   y= Integer.parseInt(txt2);
  }
    if(x>=0 && y>=0)
   {
     b=move(x,y,0);


     if(b==false)
     {
       textarea1.setText("Solution is not possible,enter other coordinates");
     }
     if(b==true)
     {
       textarea1.setText("Congratulations solution is possible");
     }
   }
}

// Use this method to add additional statements
// to customise the GUI controls
public void customGUI(){

}

這是事件處理程序文件

/* =========================================================
 * ====                   WARNING                        ===
 * =========================================================
 * The code in this tab has been generated from the GUI form
 * designer and care should be taken when editing this file.
 * Only add/edit code inside the event handlers i.e. only
 * use lines between the matching comment tags. e.g.

 void myBtnEvents(GButton button) { //_CODE_:button1:12356:
     // It is safe to enter your event code here  
 } //_CODE_:button1:12356:

 * Do not rename this tab!
 * =========================================================
 */

public void tf1(GTextField source, GEvent event) { //_CODE_:textfield1:418637:
  println("textfield1 - GTextField >> GEvent." + event + " @ " + millis());
} //_CODE_:textfield1:418637:

public void tf2(GTextField source, GEvent event) { //_CODE_:textfield2:859413:
  println("textfield2 - GTextField >> GEvent." + event + " @ " + millis());
} //_CODE_:textfield2:859413:

public void ta1(GTextArea source, GEvent event) { //_CODE_:textarea1:252891:
  println("textarea1 - GTextArea >> GEvent." + event + " @ " + millis());
} //_CODE_:textarea1:252891:

public void ta2(GTextArea source, GEvent event) { //_CODE_:textarea2:483845:
  println("textarea2 - GTextArea >> GEvent." + event + " @ " + millis());
} //_CODE_:textarea2:483845:

public void slider1_change1(GSlider source, GEvent event) { //_CODE_:slider1:280049:
  println("slider1 - GSlider >> GEvent." + event + " @ " + millis());
} //_CODE_:slider1:280049:

public void slider2_change1(GSlider source, GEvent event) { //_CODE_:slider2:362722:
  println("slider2 - GSlider >> GEvent." + event + " @ " + millis());
} //_CODE_:slider2:362722:



// Create all the GUI controls. 
// autogenerated do not edit
public void createGUI(){
  G4P.messagesEnabled(false);
  G4P.setGlobalColorScheme(GCScheme.BLUE_SCHEME);
  G4P.setCursor(ARROW);
  if(frame != null)
    frame.setTitle("Sketch Window");
  textfield1 = new GTextField(this, 210, 32, 160, 30, G4P.SCROLLBARS_NONE);
  textfield1.setText("1");
  textfield1.setPromptText("Enter x-Cordinate");
  textfield1.setOpaque(true);
  textfield1.addEventHandler(this, "tf1");
  textfield2 = new GTextField(this, 204, 96, 160, 30, G4P.SCROLLBARS_NONE);
  textfield2.setText("1");
  textfield2.setPromptText("Enter y Cordinate");
  textfield2.setLocalColorScheme(GCScheme.PURPLE_SCHEME);
  textfield2.setOpaque(true);
  textfield2.addEventHandler(this, "tf2");
  textarea1 = new GTextArea(this, 53, 196, 160, 80, G4P.SCROLLBARS_NONE);
  textarea1.setLocalColorScheme(GCScheme.GREEN_SCHEME);
  textarea1.setOpaque(true);
  textarea1.addEventHandler(this, "ta1");
  textarea2 = new GTextArea(this, 288, 192, 160, 80, G4P.SCROLLBARS_NONE);
  textarea2.setLocalColorScheme(GCScheme.YELLOW_SCHEME);
  textarea2.setOpaque(true);
  textarea2.addEventHandler(this, "ta2");
  slider1 = new GSlider(this, 96, 276, 264, 40, 10.0);
  slider1.setLimits(0.5, 0.0, 1.0);
  slider1.setNumberFormat(G4P.DECIMAL, 2);
  slider1.setOpaque(false);
  slider1.addEventHandler(this, "slider1_change1");
  slider2 = new GSlider(this, 348, 240, 100, 36, 10.0);
  slider2.setLimits(0.5, 0.0, 1.0);
  slider2.setNumberFormat(G4P.DECIMAL, 2);
  slider2.setOpaque(false);
  slider2.addEventHandler(this, "slider2_change1");
}

// Variable declarations 
// autogenerated do not edit
GTextField textfield1; 
GTextField textfield2; 
GTextArea textarea1; 
GTextArea textarea2; 
GSlider slider1; 
GSlider slider2; 

Answer 1

上述結構存在一些問題。 您可以在draw()方法中進行遞歸move() draw()方法。 但是在處理中， 動畫線程每秒都會多次調用draw() 。

這種情況的常見設計是：

• 您應該具有保存應用程序狀態 （邏輯狀態）的變量
• 您的draw()方法繪制的內容僅取決於狀態
• 狀態可以由動畫線程或任何其他線程修改

我建議稍微修改一下代碼：

第一狀態變量：

// 1 - display status, wait to enter values
// 2 - check if x and y are correct
// 3 - solve problem
int state=1;
boolean solutionExists=false;

public void setup() {
...
}

下一個draw（）方法：

void draw() {

   counter=counter+1; 
   background(0,128,128);

   String coords = "(" + x + "," + y + ")";

  if (state == 1) {
     if(solutionExists) {
       textarea1.setText("Congratulations solution is possible  " + coords);       
     } else {
       textarea1.setText("Solution is not possible,enter other coordinates  " +coords);
     }

     return; 
  }

  if (state == 2) {
    readXY();
    return;
  }

  if (state == 3) {
    println("find solution for: " + coords);
    solutionExists = move(x,y,0);
    state = 1;
    return;
  }

}

public void readXY() {
  try {
   x = Integer.parseInt(textfield1.getText().trim());
   y = Integer.parseInt(textfield2.getText().trim());
   state = 3;
  } catch(Exception e) {
    state = 1;
  }

}

最后是文本字段處理程序：

public void tf1(GTextField source, GEvent event) {
  if (event.getType().equals("LOST_FOCUS")) {
    state=2;
  }
}

public void tf2(GTextField source, GEvent event) {
  if (event.getType().equals("LOST_FOCUS")) {
    state=2;
  } 
}

如你看到的：

• 如果state==1 -draw（）僅更新消息
• 如果state==2 -draw（）檢查x和y是否有效，如果有效->將狀態更改為3
• 如果state==3 -draw（）執行遞歸算法，更新solutionExists變量，將狀態更改為1

每當您的textfield1或textfield2失去焦點時，它將狀態更改為2。

• draw（）僅由應用程序狀態驅動。
• 應用程序狀態被其他事件修改。

為了獲得最佳結果，遞歸算法應該在另一個線程中執行，而不是在動畫線程中執行。

一個不錯的提示：編輯文本字段時，它可能包含字符串，例如"" （空）或" 3" （前導空格）或" 3 "等-此類文本無法用Integer.parseInt解析-您需要修剪此類文本並請確保沒有引發NumberFormatException-請參見readXY()方法。