import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.geometry.Rectangle2D;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import java.util.Random;
 
public class myJigsaw extends Application {
 public int m;   //m是不在隨機(jī)數(shù)組的那個(gè)數(shù)字
 ImageView[] imageViews = new ImageView[9];
 public static void main(String[] args) {
  Application.launch(args);
 }
 
 
 @Override
 public void start(Stage arg0) throws Exception {
  init(arg0);
 }
 public void init(Stage stage) {
  int[] n = random();    //自定義的函數(shù)，產(chǎn)生逆序數(shù)為偶數(shù)的不重復(fù)數(shù)組
 
  Image image = new Image("1.png");
 
 
  GridPane gridPane = new GridPane();
 
  for(int i = 0, k = 0; i <= 2; ++i) {
   for(int j = 0; j <= 2; ++j, ++k) {
    imageViews[k] = new ImageView(image);  //初始化數(shù)組
    imageViews[k].setOnMouseClicked(new myevent());  //設(shè)置點(diǎn)擊事件
    imageViews[k].setViewport(new Rectangle2D(100 * j, 100 * i, 100, 100));    //切割圖片
   }
  }
 
  gridPane.add(imageViews[n[0]], 0, 0);       //按照產(chǎn)生的隨機(jī)數(shù)將imageView數(shù)組加入面板
  gridPane.add(imageViews[n[1]], 1, 0);
  gridPane.add(imageViews[n[2]], 2, 0);
  gridPane.add(imageViews[n[3]], 0, 1);
  gridPane.add(imageViews[n[4]], 1, 1);
  gridPane.add(imageViews[n[5]], 2, 1);
  gridPane.add(imageViews[n[6]], 0, 2);
  gridPane.add(imageViews[n[7]], 1, 2);
  m = findnum(n);             //找出那個(gè)不在隨機(jī)數(shù)組里面的數(shù)字
  ImageView incomp = new ImageView(imageViews[m].getImage());    //用于顯示空格子的圖片
  ImageView comp = new ImageView(image);          //用于顯示完整的大圖
  incomp.setViewport(imageViews[m].getViewport());
  Image image2 = new Image("2.png");         //2.png為一個(gè)透明圖，放在空格子中
  imageViews[m].setImage(image2);
  gridPane.add(imageViews[m], 2, 2);
  gridPane.setGridLinesVisible(true);
  BorderPane borderPane = new BorderPane(gridPane);
  VBox right = new VBox(20, incomp, comp);
  borderPane.setRight(right);
  Scene scene = new Scene(borderPane, 820, 420);
  stage.setScene(scene);
  stage.setResizable(false);
  stage.show();
 
 }
 
 public int[] random() {    //生成8個(gè)不重復(fù)的逆序數(shù)為偶數(shù)的數(shù)字
  int[] ran = new int[8];
  while(iso(ran) == false) {
   ran = random_num();
  }
  return ran;
 
 }
 
 public int[] random_num() {  //生成8個(gè)不重復(fù)數(shù)
  int r[] = new int[8];
  Random random = new Random();
  for(int i = 0; i < 8; ++i) {
   r[i] = random.nextInt(9);
   for(int j = 0;j < i; ++j) {
    while(r[i] == r[j]) {
     i--;
     break;
    }
   }
  }
  return r;
 }
 
 public boolean iso(int[] num) {   //判斷逆序數(shù)是否為偶數(shù)
  int sum = 0;
  for(int i = 0; i <= 6; ++i) {
   for(int j = i; j <= 7; j++) {
    if(num[i] > num[j]) {
     sum++;
    }
   }
  }
  if((sum % 2) == 0 && sum != 0) {
   return true;
  }
 
  return false;
 
 }
 
 class myevent implements EventHandler<MouseEvent> {    //點(diǎn)擊事件的實(shí)現(xiàn)
 
 
 @Override
  public void handle(MouseEvent arg0) {
  // TODO Auto-generated method stub
   ImageView img = (ImageView) arg0.getSource();
   double sx = img.getLayoutX();
   double sy = img.getLayoutY();
   double dispx = sx - imageViews[m].getLayoutX();
   double dispy = sy - imageViews[m].getLayoutY();
   if((dispx == -100) && (dispy == 0 )) {    //點(diǎn)擊的空格左邊的格子
    swapimg(img, imageViews[m]);    //交換imageView
    if(issucc(imageViews)) {       //判斷是否拼成功
     Alert alert = new Alert(AlertType.WARNING, "成功！");
     alert.show();
    }
   }
 
   else if ((dispx == 0) && (dispy == -100)) {  //上面的格子
    swapimg(img, imageViews[m]);
    if(issucc(imageViews)) {
     Alert alert = new Alert(AlertType.WARNING, "成功！");
     alert.show();
    }
   }
   else if((dispx == 100) && (dispy == 0)) {    //右邊的格子
    swapimg(img, imageViews[m]);
    if(issucc(imageViews)) {
     Alert alert = new Alert(AlertType.WARNING, "成功！");
     alert.show();
    }
   }
   else if((dispx == 0) && (dispy == 100)) {    //下面的格子
    swapimg(img, imageViews[m]);
    if(issucc(imageViews)) {
     Alert alert = new Alert(AlertType.WARNING, "成功！");
     alert.show();
    }
   }
  }
  public void swapimg(ImageView i1, ImageView i2) {    //交換兩個(gè)imageView的實(shí)現(xiàn)
   int row1 = GridPane.getRowIndex(i1);
   int colu1 = GridPane.getColumnIndex(i1);
   int row2 = GridPane.getRowIndex(i2);
   int colu2 = GridPane.getColumnIndex(i2);
 
   GridPane.setRowIndex(i1, row2);
   GridPane.setColumnIndex(i1, colu2);
   GridPane.setRowIndex(i2, row1);
   GridPane.setColumnIndex(i2, colu1);
  }
 }
 public boolean issucc(ImageView[] imageViews) {        //判斷是否拼成功
  for(int i = 0; i <= 8; ++i) {
   if(i != 3 * GridPane.getRowIndex(imageViews[i]) + GridPane.getColumnIndex(imageViews[i])) {
    return false;
   }
  }
   return true;
 }
 
 public int findnum(int[] n) {            //找出m
  for(int j = 0; j <= 8; ++j) {
   if((j == n[0]) || (j == n[1]) || (j == n[2]) || (j == n[3]) || (j == n[4]) || (j == n[5]) || (j == n[6]) || (j == n[7])) {
   }
   else {
    return j;
   }
  }
  return -1;
 } 
 
}