JavaFX冻结问题

它是一个应用程序,使红绿色渐变模式,并有一个很酷的动画与它一起使用.运行应用程序时,按Enter键,动画将开始.经过一段时间(看起来像我之前说的那样随机)它会停止更新,但是计时器继续运行,循环也是如此,并且仍然使用正确的参数调用setColor方法,这让我认为PixelWriter被冻结或窗口未更新.

我所做的代码如下：

package me.dean;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.image.PixelWriter;
import javafx.scene.input.KeyCode;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

import java.util.Timer;
import java.util.TimerTask;
public class DeansApp extends Application {
    CoolAnimation canvas;

    @Override
    public void start(Stage primaryStage) throws Exception {
        canvas = new CoolAnimation();
        canvas.setWidth(255);
        canvas.setHeight(255);
        primaryStage.setScene(new Scene(new Pane(canvas)));
        canvas.getScene().setOnKeyPressed(event -> {
            if(event.getCode().equals(KeyCode.ENTER)) {
                canvas.play ^= true;
            }
        });

        primaryStage.setOnCloseRequest(event -> System.exit(0));
        primaryStage.show();
    }

    private class CoolAnimation extends Canvas {
        boolean play;
        int column = 0;
        boolean coloring = true;

        public CoolAnimation() {
            super();

            new Timer().schedule(new TimerTask() {
                @Override
                public void run() {
                    if(CoolAnimation.this.play) {
                        GraphicsContext g = getGraphicsContext2D();
                        if(g != null) {
                            PixelWriter writer = g.getPixelWriter();
                            if(writer != null) {
                                for (int x = Math.min(255,column),y = Math.max(0,column - (int) CoolAnimation.this.getWidth());
                                     x >= 0 && y<=255;
                                     x--,y++) {
                                    writer.setColor(x,y,coloring ? Color.rgb(x,0) : Color.WHITE);
                                }
                            }
                        }
                        column++;
                        if(column >= CoolAnimation.this.getWidth() * 2) {
                            coloring ^= true;
                            column = 0;
                        }
                    }
                }
            },0L,10L);
        }
    }
}

非常感谢能够提供帮助的任何人！