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AVLscene.java
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AVLscene.java
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import javafx.scene.Scene;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.input.KeyCodeCombination;
import javafx.scene.input.KeyCombination;
import javafx.scene.layout.*;
import javafx.scene.control.*;
import javafx.geometry.*;
import javafx.scene.shape.*;
import javafx.scene.text.*;
import javafx.scene.paint.Color;
import java.util.*;
public class AVLscene extends Scene {
private Main main;
private TextField input;
private AVLTree<Integer> arbol = new AVLTree<>();
private double vGap = 60;
private double radius = 20;
private Pane avl;
public AVLscene(Main main) {
super(new VBox());
this.main = main;
/***************
* GUI Elements *
****************/
VBox mainContent = new VBox(20);
MenuBar menuBar = new MenuBar();
Menu menu = new Menu("Options ");
MenuItem randomTree = new MenuItem("Random tree");
MenuItem clear = new MenuItem("Clear");
MenuItem exitOption = new MenuItem("Exit");
FlowPane bottom = new FlowPane();
avl = new Pane();
input = new TextField();
Label lblinput = new Label("Element:");
Button insert = new Button("Insert");
Button delete = new Button("Delete");
/****************
* Key shortcuts *
*****************/
randomTree.setAccelerator(new KeyCodeCombination(KeyCode.R, KeyCombination.CONTROL_DOWN));
exitOption.setAccelerator(new KeyCodeCombination(KeyCode.E, KeyCombination.CONTROL_DOWN));
input.setOnKeyPressed((KeyEvent keyEvent) -> {
if (keyEvent.getCode().equals(KeyCode.ENTER)) {
insert();
}
});
/***********
* Styles *
************/
avl.setMinSize(900, 450);
avl.setPadding(new Insets(20, 20, 20, 20));
bottom.setHgap(15);
bottom.setVgap(15);
bottom.setAlignment(Pos.CENTER);
bottom.setPadding(new Insets(10, 10, 10, 10));
/*************************
* Main content structure *
**************************/
menu.getItems().addAll(clear, randomTree, exitOption);
menuBar.getMenus().add(menu);
bottom.getChildren().addAll(lblinput, input, insert, delete);
mainContent.getChildren().addAll(menuBar, avl, bottom);
super.setRoot(mainContent);
/*****************
* Event handlers *
******************/
randomTree.setOnAction(e -> {
randomTree();
});
clear.setOnAction(e -> {
avl.getChildren().clear();
arbol.setOrigin(null);
});
exitOption.setOnAction(e -> {
main.closeStage();
});
insert.setOnAction(e -> {
insert();
});
delete.setOnAction(e -> {
delete();
});
}
/*****************
* Events methods *
******************/
public void displayAVLTree() {
avl.getChildren().clear(); // Clear the pane
if (arbol.getOrigin() != null) {
// Display tree recursively
displayAVLTree(arbol.getOrigin(), avl.getWidth() / 2, vGap, avl.getWidth() / 4);
}
}
private void displayAVLTree(Node root, double x, double y, double hGap) {
if (root.getLeft() != null) {
// Draw a line to the left node
avl.getChildren().add(new Line(x - hGap, y + vGap, x, y));
// Draw the left subtree recursively
displayAVLTree(root.getLeft(), x - hGap, y + vGap, hGap / 2);
}
if (root.getRight() != null) {
// Draw a line to the right node
avl.getChildren().add(new Line(x + hGap, y + vGap, x, y));
// Draw the right subtree recursively
displayAVLTree(root.getRight(), x + hGap, y + vGap, hGap / 2);
}
// Display a node
Circle circle = new Circle(x, y, radius);
circle.setId("circle");
circle.setStroke(Color.GRAY);
circle.setStrokeWidth(1);
//circle.setFill(Color.rgb((int)(Math.random()*256), (int)(Math.random()*256), (int)(Math.random()*256)));
circle.setFill(Color.rgb(89, 217, 149));
avl.getChildren().addAll(circle, new Text(x - 4, y + 4, root.getElement() + ""));
}
private void randomTree(){
avl.getChildren().clear();
arbol.setOrigin(null);
Random randNum = new Random();
//random array size from 3 to 15
int setSize = (randNum.nextInt(15)+3);
//Create a HashSet to get only unique elements
Set<Integer> set = new LinkedHashSet<Integer>();
while (set.size() < setSize) {
set.add(randNum.nextInt(100)+1);
}
//Insert the set elements in the tree
try{
for(int x: set){
arbol.insertElement(x);
}
}catch(DuplicateException de){
}
displayAVLTree();
}
private void insert(){
try{
int toInsert = Integer.parseInt(input.getText());
try{
arbol.insertElement(toInsert);
displayAVLTree();
}catch(DuplicateException de){
Alert alert = new Alert(Alert.AlertType.ERROR);
alert.setTitle("Duplicate");
alert.setHeaderText(de.getMessage());
alert.showAndWait();
}
}catch(Exception empty){
Alert alert = new Alert(Alert.AlertType.ERROR);
alert.setTitle("Empty field");
alert.setHeaderText("Please introduce an element");
alert.showAndWait();
}
input.setText("");
}
private void delete(){
if(input.getText().equals(arbol.getOrigin().getElement())){
arbol.deleteNode(Integer.parseInt(input.getText()));
} else {
arbol.deleteNode2(Integer.parseInt(input.getText()));
}
displayAVLTree();
input.setText("");
}
}