Javafx位置检测

我想探测火何时通过蓝色圆点的右侧。我想知道火焰正左边的格子里什么时候有个点。在这个类Cells.java中，我可以使用什么方法，如果单元格左侧的单元格一列中有一个点包含像素坐标（x，y），则返回true，否则返回false。我正在考虑使用类似布尔点到左（intx，inty）的东西

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看不到你在尝试任何事情……）

import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.util.Duration;
import javafx.scene.image.Image;[enter image description here][1]
public class Cells extends Application {
final String appName = "Cells";
final int FPS = 20; // frames per second
final int WIDTH = 360;
final int HEIGHT = 300;
FireSprite fire;
Image fireImage;
int map[][] = new int[6][5];
int counter = 0;

public static final int CELLSIZE = 60;
public void initialize() {
    // Setup the fire character
    fireImage = new Image("fire.gif");
    setupWorld();
}

void setupWorld() {
    // Initialize map
    for (int x = 0; x < 6; x++)
        for (int y = 0; y < 5; y++) {
            map[x][y] = 0;
        }
    // Place a few landmarks
    int c = 0;
    while (c < 3) {
        int a = (int) (6 * Math.random());
        int b = (int) (5 * Math.random());
        if (map[a][b] != 1) {
            map[a][b] = 1;
            c++;
        }
    }
    // Place flame
    c = 0;
    while (c == 0) {
        int a = (int) (6 * Math.random());
        int b = (int) (5 * Math.random());
        if (map[a][b] != 1) {
            fire = new FireSprite(a * CELLSIZE + 10, b * CELLSIZE + 10, fireImage);
            c++;
        }
    }
}

public void update() {
    counter++;
    if (counter > 150) {
        setupWorld();
        counter = 0;
    }
    fire.update();
}

public void render(GraphicsContext gc) {
    // draw the cell map
    for (int x = 0; x < 6; x++)
        for (int y = 0; y < 5; y++) {
            int tx = x * CELLSIZE;
            int ty = y * CELLSIZE;
            gc.setFill(Color.WHITE);
            gc.fillRect(tx, ty, CELLSIZE, CELLSIZE);
            gc.setStroke(Color.BLACK);
            gc.strokeRect(tx, ty, CELLSIZE - 1, CELLSIZE - 1);
            // Check for landmarks
            if (map[x][y] == 1) {
                gc.setFill(Color.BLUE);
                gc.fillOval(tx + 5, ty + 5, CELLSIZE - 10, CELLSIZE - 10);
            }
        }
    // Then draw the fire character
    fire.render(gc);
}

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

@Override
public void start(Stage theStage) {
    theStage.setTitle(appName);

    Group root = new Group();
    Scene theScene = new Scene(root);
    theStage.setScene(theScene);

    Canvas canvas = new Canvas(WIDTH, HEIGHT);
    root.getChildren().add(canvas);

    GraphicsContext gc = canvas.getGraphicsContext2D();

    // Initial setup
    initialize();

    // Setup and start animation loop (Timeline)
    KeyFrame kf = new KeyFrame(Duration.millis(1000 / FPS), e -> {
        // update position
        update();
        // draw frame
        render(gc);
    });
    Timeline mainLoop = new Timeline(kf);
    mainLoop.setCycleCount(Animation.INDEFINITE);
    mainLoop.play();

    theStage.show();
}

import javafx.scene.canvas.GraphicsContext;
import javafx.scene.image.Image;
public class FireSprite {
int x, y;
int dx, dy;

Image image;

public FireSprite(int x1, int y1, Image i) {
    x = x1;
    y = y1;
    image = i;
    dx = 5;
    dy = 0;
}

public void update() {
    // Check for direction change
    if (((x - 10) % Cells.CELLSIZE == 0) && ((y - 10) % Cells.CELLSIZE == 0)) {
        if (Math.random() > 0.5) {
            dx = 5;
            dy = 0;
        } else {
            dx = 0;
            dy = 5;
        }
    }
    // Move a bit
    x += dx;
    y += dy;
    // Then check for right edge (and loop back to left)
    if (x > 6 * Cells.CELLSIZE)
        x = 0;
    // Check for bottom edge
    if (y > 5 * Cells.CELLSIZE)
        y = 0;
}

public void render(GraphicsContext gc) {
    gc.drawImage(image, x, y);
}