Data commit

Task/Pentagram/Java/pentagram.java

@@ -0,0 +1,63 @@
+import java.awt.*;
+import java.awt.geom.Path2D;
+import javax.swing.*;
+
+public class Pentagram extends JPanel {
+
+    final double degrees144 = Math.toRadians(144);
+
+    public Pentagram() {
+        setPreferredSize(new Dimension(640, 640));
+        setBackground(Color.white);
+    }
+
+    private void drawPentagram(Graphics2D g, int len, int x, int y,
+            Color fill, Color stroke) {
+        double angle = 0;
+
+        Path2D p = new Path2D.Float();
+        p.moveTo(x, y);
+
+        for (int i = 0; i < 5; i++) {
+            int x2 = x + (int) (Math.cos(angle) * len);
+            int y2 = y + (int) (Math.sin(-angle) * len);
+            p.lineTo(x2, y2);
+            x = x2;
+            y = y2;
+            angle -= degrees144;
+        }
+        p.closePath();
+
+        g.setColor(fill);
+        g.fill(p);
+
+        g.setColor(stroke);
+        g.draw(p);
+    }
+
+    @Override
+    public void paintComponent(Graphics gg) {
+        super.paintComponent(gg);
+        Graphics2D g = (Graphics2D) gg;
+
+        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
+                RenderingHints.VALUE_ANTIALIAS_ON);
+
+        g.setStroke(new BasicStroke(5, BasicStroke.CAP_ROUND, 0));
+
+        drawPentagram(g, 500, 70, 250, new Color(0x6495ED), Color.darkGray);
+    }
+
+    public static void main(String[] args) {
+        SwingUtilities.invokeLater(() -> {
+            JFrame f = new JFrame();
+            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+            f.setTitle("Pentagram");
+            f.setResizable(false);
+            f.add(new Pentagram(), BorderLayout.CENTER);
+            f.pack();
+            f.setLocationRelativeTo(null);
+            f.setVisible(true);
+        });
+    }
+}