added stop/resume

Author: Leonardpepa

Path Finding Visualizer.jar

@@ -4,6 +4,10 @@
 import java.awt.Graphics2D;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
+import java.awt.event.FocusEvent;
+import java.awt.event.FocusListener;
+import java.awt.event.KeyAdapter;
+import java.awt.event.KeyEvent;
 import java.util.Random;
 
 import javax.swing.JButton;
@@ -16,14 +20,14 @@
 import javax.swing.event.ChangeEvent;
 import javax.swing.event.ChangeListener;
 
-public class ControlsPanel extends JPanel {
+public class ControlsPanel extends JPanel implements ActionListener {
 
 	private JButton search;
 	private JButton reset;
 	private JButton resetPath;
 	private JButton generate;
 	private JComboBox<String> algorithms;
-//	private JComboBox<String> mazes;
+
 	private JSlider size;
 	private JSlider delay;
 	private JLabel sizeLabel;
@@ -40,31 +44,60 @@ public class ControlsPanel extends JPanel {
 	private JLabel path;
 	private JLabel wall;
 	private JButton help;
+	private GridPanel gridPanel;
+	SearchAlgorithms algo = null;
 
 	public ControlsPanel(int width, int height, GridPanel gridPanel) {
+		this.gridPanel = gridPanel;
+
 		this.setPreferredSize(new Dimension(width, height));
 		this.setFocusable(true);
 		this.setLayout(null);
+		this.requestFocus();
+		this.addFocusListener(new FocusListener() {
 
-		search = new JButton("Visualize");
-		search.setBounds(25, 10, 150, 30);
-		search.addActionListener(new ActionListener() {
+			@Override
+			public void focusLost(FocusEvent e) {
+				ControlsPanel p = (ControlsPanel) e.getSource();
+				p.requestFocus();
+			}
 
 			@Override
-			public void actionPerformed(ActionEvent e) {
-				if (MyUtils.solving) {
-					return;
-				}
-				gridPanel.resetPath();
+			public void focusGained(FocusEvent e) {
 
-				MyUtils.solving = true;
-				SearchAlgorithms algo = new SearchAlgorithms(gridPanel.getGrid(), gridPanel);
-				algo.start();
 			}
 		});
+		this.addKeyListener(new KeyAdapter() {
+			@SuppressWarnings("removal")
+			@Override
+			public void keyPressed(KeyEvent e) {
+
+				if (e.getKeyCode() == KeyEvent.VK_SPACE) {
+					if (algo == null || !MyUtils.solving) {
+						return;
+					}
+
+					if (MyUtils.stopped) {
+						MyUtils.stopped = false;
+						algo.resume();
+						return;
+					}
+
+					MyUtils.stopped = true;
+					algo.suspend();
+
+				}
+			}
+		});
+
+		search = new JButton("Visualize");
+		search.setBounds(25, 10, 150, 30);
+		search.addActionListener(this);
+		search.setFocusable(false);
 
 		generate = new JButton("Generate maze");
 		generate.setBounds(25, 50, 150, 30);
+		generate.setFocusable(false);
 		generate.addActionListener(new ActionListener() {
 
 			@Override
@@ -91,6 +124,7 @@ public void actionPerformed(ActionEvent e) {
 
 		reset = new JButton("Reset grid");
 		reset.setBounds(25, 90, 150, 30);
+		reset.setFocusable(false);
 		reset.addActionListener(new ActionListener() {
 			@Override
 			public void actionPerformed(ActionEvent e) {
@@ -104,6 +138,7 @@ public void actionPerformed(ActionEvent e) {
 
 		resetPath = new JButton("Reset path");
 		resetPath.setBounds(25, 130, 150, 30);
+		resetPath.setFocusable(false);
 		resetPath.addActionListener(new ActionListener() {
 			@Override
 			public void actionPerformed(ActionEvent e) {
@@ -118,7 +153,7 @@ public void actionPerformed(ActionEvent e) {
 		algorithms = new JComboBox<>(algorithmsName);
 		algorithms.setSelectedIndex(0);
 		algorithms.setBounds(25, 175, 150, 30);
-
+		algorithms.setFocusable(false);
 		algorithms.addActionListener(new ActionListener() {
 			@Override
 			public void actionPerformed(ActionEvent e) {
@@ -132,6 +167,7 @@ public void actionPerformed(ActionEvent e) {
 
 		allowDiagonials = new JCheckBox("Allow diagonial moves");
 		allowDiagonials.setBounds(20, 215, 200, 20);
+		allowDiagonials.setFocusable(false);
 		allowDiagonials.addChangeListener(new ChangeListener() {
 			@Override
 			public void stateChanged(ChangeEvent e) {
@@ -149,12 +185,13 @@ public void stateChanged(ChangeEvent e) {
 
 		sizeLabel = new JLabel("Size: 20x20");
 		sizeLabel.setBounds(24, 245, 150, 20);
+		sizeLabel.setFocusable(false);
 
 		size = new JSlider(20, 60, Node.size);
 		size.setMajorTickSpacing(10);
 		size.setMinorTickSpacing(10);
 		size.setBounds(18, 270, 150, 20);
-
+		size.setFocusable(false);
 		size.addChangeListener(new ChangeListener() {
 			@Override
 			public void stateChanged(ChangeEvent e) {
@@ -173,11 +210,13 @@ public void stateChanged(ChangeEvent e) {
 
 		delayLabel = new JLabel("Delay: 30ms");
 		delayLabel.setBounds(24, 295, 150, 20);
+		delayLabel.setFocusable(false);
 
 		delay = new JSlider(0, 100, MyUtils.delay);
 		delay.setMajorTickSpacing(10);
 		delay.setMinorTickSpacing(10);
 		delay.setBounds(18, 320, 150, 20);
+		delay.setFocusable(false);
 
 		delay.addChangeListener(new ChangeListener() {
 			@Override
@@ -189,40 +228,50 @@ public void stateChanged(ChangeEvent e) {
 
 		copyright = new JLabel("© 2021 Leonard Pepa ics20033");
 		copyright.setBounds(10, (int) (this.getPreferredSize().getHeight() - 30), 200, 20);
+		copyright.setFocusable(false);
 
 		start = new JLabel("Starting node");
 		start.setBounds(50, 350, 100, 15);
+		start.setFocusable(false);
 
 		target = new JLabel("Target node");
 		target.setBounds(50, 375, 100, 15);
+		target.setFocusable(false);
 
 		current = new JLabel("Current node");
 		current.setBounds(50, 400, 100, 15);
+		current.setFocusable(false);
 
 		visited = new JLabel("Visited node");
 		visited.setBounds(50, 425, 100, 15);
+		visited.setFocusable(false);
 
 		frontier = new JLabel("Frontier node");
 		frontier.setBounds(50, 450, 100, 15);
+		frontier.setFocusable(false);
 
 		path = new JLabel("Path node");
 		path.setBounds(50, 475, 100, 15);
+		path.setFocusable(false);
 
 		wall = new JLabel("Wall node");
 		wall.setBounds(50, 500, 100, 15);
+		wall.setFocusable(false);
 
 		help = new JButton("** Help **");
 		help.setBounds(25, (int) (this.getPreferredSize().getHeight() - 70), 150, 30);
+		help.setFocusable(false);
+
 		help.addActionListener(new ActionListener() {
 			@Override
 			public void actionPerformed(ActionEvent e) {
-				JOptionPane.showMessageDialog(null,
-						"Move Starting Node: drag the starting node with left click pressed" + System.lineSeparator()
-								+ System.lineSeparator()
-								+ "Move Target Node: drag the target node with left click pressed"
-								+ System.lineSeparator() + System.lineSeparator()
-								+ "Place Wall Node: press or drag empty cells with left click" + System.lineSeparator()
-								+ System.lineSeparator() + "Erase Wall Node: press or drag wall cells with right click",
+				JOptionPane.showMessageDialog(null, "Move Starting Node: drag the starting node with left click pressed"
+						+ System.lineSeparator() + System.lineSeparator()
+						+ "Move Target Node: drag the target node with left click pressed" + System.lineSeparator()
+						+ System.lineSeparator() + "Place Wall Node: press or drag empty cells with left click"
+						+ System.lineSeparator() + System.lineSeparator()
+						+ "Erase Wall Node: press or drag wall cells with right click" + System.lineSeparator()
+						+ System.lineSeparator() + "Pause/resume: press space to pause or resume the proccess",
 						"Instructions", JOptionPane.INFORMATION_MESSAGE);
 			}
 		});
@@ -246,6 +295,7 @@ public void actionPerformed(ActionEvent e) {
 		this.add(path);
 		this.add(wall);
 		this.add(help);
+
 	}
 
 	@Override
@@ -276,4 +326,18 @@ public void paintComponent(Graphics graphics) {
 	}
 
 	private static final long serialVersionUID = -7860009947400256170L;
+
+	@Override
+	public void actionPerformed(ActionEvent e) {
+		this.requestFocus();
+
+		if (MyUtils.solving) {
+			return;
+		}
+		gridPanel.resetPath();
+
+		MyUtils.solving = true;
+		algo = new SearchAlgorithms(gridPanel.getGrid(), gridPanel);
+		algo.start();
+	}
 }

Path-Finding_Visualizer/src/ControlsPanel.java

@@ -1,6 +1,7 @@
 import java.awt.BasicStroke;
 import java.awt.Color;
 import java.awt.Cursor;
+import java.awt.Font;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.event.MouseEvent;
@@ -62,6 +63,7 @@ public void updateFinish(int x, int y) {
 	public void resetGrid() {
 		MyUtils.solving = false;
 		MyUtils.breakAlgo = true;
+		MyUtils.stopped = false;
 		grid.initialiseGrid();
 		this.revalidate();
 		this.repaint();
@@ -88,6 +90,14 @@ public void paintComponent(Graphics graphics) {
 		g.setStroke(new BasicStroke(1.5f));
 		g.setColor(Color.black);
 		grid.drawGrid(g, this);
+		
+		if(MyUtils.stopped) {
+			g.setFont(new Font("Poppins", Font.CENTER_BASELINE, 60));
+			g.setColor(new Color(255, 0, 142));
+			g.drawString("Paused", width / 2 - 110 , height / 4);
+			g.setFont(new Font("Poppins", Font.CENTER_BASELINE, 30));
+			g.drawString("Press space to resume", width / 2 - 160 , height / 3);
+		}
 	}
 
 	@Override
@@ -96,6 +106,7 @@ public void mouseClicked(MouseEvent e) {
 	}
 
 	public void resetPath() {
+		MyUtils.stopped = false;
 		grid.resetPath();
 		this.revalidate();
 		this.repaint();

Path-Finding_Visualizer/src/GridPanel.java

@@ -8,4 +8,5 @@ public class MyUtils {
 	public static boolean solving = false;
 	public static boolean breakAlgo = false;
 	public static boolean allowDiagonials = false;
+	public static boolean stopped = false;
 }