JavaFX Grid Coordinates Demo

GridCoordinatesDemo.java

// GridCoordinatesDemo.java (JavaFX)

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.control.Label;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class GridCoordinatesDemo extends Application {

    private static final int WINDOW_WIDTH = 1280;
    private static final int WINDOW_HEIGHT = 740;
    private static final int GRID_SIZE = 50; // Size of each grid cell

    private Label statusLabel;

    @Override
    public void start(Stage primaryStage) {
        BorderPane root = new BorderPane();

        // Create a canvas for drawing the grid
        Canvas canvas = new Canvas(WINDOW_WIDTH, WINDOW_HEIGHT);
        GraphicsContext gc = canvas.getGraphicsContext2D();
        drawGrid(gc);

        // Create a pane to hold the canvas
        Pane canvasPane = new Pane();
        canvasPane.getChildren().add(canvas);

        // Create status label to show coordinates
        statusLabel = new Label("Mouse Position: ");
        BorderPane.setMargin(statusLabel, new Insets(5));

        // Add mouse event handlers
        canvas.setOnMouseMoved(this::handleMouseMove);
        canvas.setOnMouseClicked(this::handleMouseClick);

        // Set up the root layout
        root.setCenter(canvasPane);
        root.setBottom(statusLabel);

        // Create the scene and show the stage
        Scene scene = new Scene(root, WINDOW_WIDTH, WINDOW_HEIGHT);
        primaryStage.setTitle("JavaFX Grid Coordinates Demo");
        primaryStage.setScene(scene);
        primaryStage.setResizable(false);
        primaryStage.show();
    }

    private void drawGrid(GraphicsContext gc) {
        // Clear the canvas
        gc.setFill(Color.WHITE);
        gc.fillRect(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);

        // Draw the grid lines
        gc.setStroke(Color.LIGHTGRAY);
        gc.setLineWidth(1);

        // Draw vertical grid lines
        for (int x = 0; x <= WINDOW_WIDTH; x += GRID_SIZE) {
            gc.strokeLine(x, 0, x, WINDOW_HEIGHT);

            // Draw coordinates on x-axis (every 100 pixels)
            if (x % 100 == 0) {
                gc.setFill(Color.BLACK);
                gc.fillText(Integer.toString(x), x + 5, 15);
            }
        }

        // Draw horizontal grid lines
        for (int y = 0; y <= WINDOW_HEIGHT; y += GRID_SIZE) {
            gc.strokeLine(0, y, WINDOW_WIDTH, y);

            // Draw coordinates on y-axis (every 100 pixels)
            if (y % 100 == 0) {
                gc.setFill(Color.BLACK);
                gc.fillText(Integer.toString(y), 5, y + 15);
            }
        }

        // Draw origin
        gc.setFill(Color.RED);
        gc.fillOval(-5, -5, 10, 10);
        gc.setFill(Color.BLACK);
        gc.fillText("Origin (0,0)", 20, 20);

        // Draw x and y axis with arrows
        gc.setStroke(Color.RED);
        gc.setLineWidth(2);

        // X-axis
        gc.strokeLine(0, 0, 100, 0);
        gc.strokeLine(100, 0, 95, -5);
        gc.strokeLine(100, 0, 95, 5);
        gc.setFill(Color.RED);
        gc.fillText("X", 105, 15);

        // Y-axis
        gc.strokeLine(0, 0, 0, 100);
        gc.strokeLine(0, 100, -5, 95);
        gc.strokeLine(0, 100, 5, 95);
        gc.fillText("Y", 15, 105);
    }

    private void handleMouseMove(MouseEvent event) {
        // Update status label with current mouse coordinates
        int x = (int) event.getX();
        int y = (int) event.getY();
        statusLabel.setText(String.format("Mouse Position: (%d, %d)", x, y));
    }

    private void handleMouseClick(MouseEvent event) {
        // Show cell coordinates when clicked
        int x = (int) event.getX();
        int y = (int) event.getY();
        System.out.printf("Clicked at (%d, %d)%n", x, y);
    }

    public static void main(String[] args) {
        launch(args);
    }
}