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package sample;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
public class _star extends Application {
public static void main(String... args) {
Application.launch(args);
}
private static final int VIEW_W = 400, VIEW_H = 300;
private GraphicsContext gc;
@Override
public void start(Stage stage) throws Exception {
BorderPane pane = new BorderPane();
Scene scene = new Scene(pane);
stage.setScene(scene);
Canvas view = new Canvas(VIEW_W, VIEW_H);
pane.setCenter(view);
gc = view.getGraphicsContext2D();
draw();
stage.show();
}
private static final double RAD = Math.PI / 180;
private static final double IN_LEN = 50, OUT_LEN =
IN_LEN * Math.sin(126 * RAD) / Math.sin(18 * RAD);
private void draw() {
gc.setTransform(1, 0, 0, -1, VIEW_W / 2, VIEW_H / 2);
gc.beginPath();
double len, t, x, y;
for (int i = 0; i < 10; i++) {
t = (2 * i + 1) * Math.PI / 10;
len = (i % 2 == 1) ? IN_LEN : OUT_LEN;
x = len * Math.cos(t);
y = len * Math.sin(t);
if (i == 0) gc.moveTo(x, y);
else gc.lineTo(x, y);
}
gc.closePath();
gc.stroke();
}
}