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.stage.Stage;public class JavaFXApplicationHeart extends Application {@Overridepublic void start(Stage primaryStage) {int width, height;Canvas canvas = new Canvas(350, 350);width = (int) canvas.getWidth();height = (int) canvas.getHeight();GraphicsContext gc = canvas.getGraphicsContext2D();double x, y, r;for (int i = 0; i <= 90; i++) {for (int j = 0; j <= 90; j++) {//轉(zhuǎn)換為直角坐標(biāo)系，設(shè)置偏移量，使圖像居中r = Math.PI / 45 * i * (1 - Math.sin(Math.PI / 45 * j)) * 19;x = r * Math.cos(Math.PI / 45 * j) * Math.sin(Math.PI / 45 * i) + width / 2;y = -r * Math.sin(Math.PI / 45 * j) + height / 4;gc.setFill(Color.RED);gc.fillOval(x, y, 2, 2);gc.fillOval(x, y, 1, 1);}}StackPane root = new StackPane();root.getChildren().add(canvas);Scene scene = new Scene(root, Color.BLACK);primaryStage.setTitle("r=a(1-sinθ)");primaryStage.setScene(scene);primaryStage.show();}public static void main(String[] args) {launch(args);}}