javafx在Canvas上填充10个不同颜色的圆。位置、大小和颜色随机。

以下是JavaFX在Canvas上填充10个不同颜色的圆的示例代码：

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;

import java.util.Random;

public class Main extends Application {

    private static final int CANVAS_WIDTH = 400;
    private static final int CANVAS_HEIGHT = 400;
    private static final int CIRCLE_RADIUS_MIN = 10;
    private static final int CIRCLE_RADIUS_MAX = 50;

    private static final Random random = new Random();

    @Override
    public void start(Stage primaryStage) throws Exception {
        Canvas canvas = new Canvas(CANVAS_WIDTH, CANVAS_HEIGHT);
        GraphicsContext gc = canvas.getGraphicsContext2D();

        for (int i = 0; i < 10; i++) {
            double x = random.nextDouble() * CANVAS_WIDTH;
            double y = random.nextDouble() * CANVAS_HEIGHT;
            double radius = CIRCLE_RADIUS_MIN + random.nextDouble() * (CIRCLE_RADIUS_MAX - CIRCLE_RADIUS_MIN);
            Color color = Color.rgb(random.nextInt(256), random.nextInt(256), random.nextInt(256));
            gc.setFill(color);
            gc.fillOval(x - radius, y - radius, radius * 2, radius * 2);
        }

        StackPane root = new StackPane(canvas);
        Scene scene = new Scene(root);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

这段代码使用JavaFX的Canvas和GraphicsContext类来绘制10个随机位置、大小和颜色的圆形。每个圆形的位置、半径和颜色都是随机生成的。