I would first like to say that I have extensively looked into this over the past day and I haven't found anything that fits this particular case. I'm in the midst of trying to create a simply Conway's Game of Life Application, and I seem to be having trouble with drawing to a JavaFX Canvas. Everything seems to be configurerd correctly (Canvas added to a layout container, said container added to a scene, and the stage is started) but even after trying different ways of encapsultating the code the Canvas remains to be empty
Here is my code:
public class Life extends Application implements Runnable {
private Grid grid;
private boolean running;
private boolean paused;
private int stepsPerMinute;
@Override
public void start(Stage stage) {
this.grid = new Grid(60, 40);
this.running = true;
this.paused = false;
this.stepsPerMinute = 60;
StackPane root = new StackPane();
root.getChildren().add(grid);
Scene scene = new Scene(root, 1080, 720);
stage.setTitle("Conway's Game of Life");
stage.setScene(scene);
stage.setResizable(false);
stage.setOnCloseRequest(e -> stop());
stage.show();
}
public void run() {
while (running) {
if (!paused) {
try {
Thread.sleep(1000 / stepsPerMinute);
} catch (InterruptedException e) { e.printStackTrace(); }
grid.step();
grid.draw();
}
}
}
@Override
public void stop() {
this.running = false;
// TODO: Dump Stats at end
System.exit(0);
}
public static void main(String[] args) { launch(args); }
public class Grid extends Canvas {
private final int WIDTH = 1080, HEIGHT = 720;
private boolean[][] cellStates;
private int rows, cols;
private int stepNum;
public Grid(int rows, int cols) {
this.rows = rows;
this.cols = cols;
this.stepNum = 0;
randomize();
minWidth(WIDTH);
maxWidth(WIDTH);
prefWidth(WIDTH);
minHeight(HEIGHT);
maxHeight(HEIGHT);
prefHeight(HEIGHT);
}
public Grid(boolean[][] cellStates) {
this.cellStates = cellStates;
this.rows = cellStates.length;
this.cols = cellStates[0].length;
this.stepNum = 0;
}
public void step() {
boolean[][] updatedStates = new boolean[rows][cols];
for (int i = 0; i < rows; i++)
for (int j = 0; j < cols; j++) {
int aliveNeighbors = countAliveNeighbors(i, j);
if (cellStates[i][j]) {
if (aliveNeighbors == 2 || aliveNeighbors == 3)
updatedStates[i][j] = true;
}
else if (aliveNeighbors == 3)
updatedStates[i][j] = true;
}
this.cellStates = updatedStates;
stepNum++;
}
private int countAliveNeighbors(int r, int c) {
int result = 0;
for (int i = -1; i <= 1; i++)
for (int j = -1; j <= 1; j++) {
if (cellStates[ (rows + r + i) % rows ][ (cols + c + j) % cols ])
result++;
}
return result;
}
public void randomize() {
boolean[][] updatedStates = new boolean[rows][cols];
for (int i = 0; i < rows; i++)
for (int j = 0; j < cols; j++) {
if (Math.random() < 0.08)
updatedStates[i][j] = true;
}
this.cellStates = updatedStates;
}
public void glider(){
this.cellStates = new boolean[rows][cols];
this.cellStates[1][2] = true;
this.cellStates[2][3] = true;
this.cellStates[3][1] = true;
this.cellStates[3][2] = true;
this.cellStates[3][3] = true;
}
public void draw() {
GraphicsContext g = this.getGraphicsContext2D();
int cellWidth = WIDTH / cols, cellHeight = HEIGHT / rows;
for (int i = 0; i < rows; i++)
for (int j = 0; j < cols; j++) {
if (cellStates[i][j])
g.setFill(Color.color(0.0078, 0, 1));
else
g.setFill(Color.color(0.9961, 1, 0.8431));
g.fillRect(j * cellWidth, i * cellHeight, cellWidth, cellHeight);
g.strokeLine(j * cellWidth, 0, j * cellWidth, HEIGHT);
g.strokeLine(0, i * cellHeight, WIDTH, i * cellHeight);
}
}
}
}
I left the imports out of the code for sake of brevity.
Thank you!
