Data commit

Task/Pentagram/Scala/pentagram.scala

@@ -0,0 +1,53 @@
+import java.awt._
+import java.awt.geom.Path2D
+
+import javax.swing._
+
+object Pentagram extends App {
+
+  SwingUtilities.invokeLater(() =>
+    new JFrame("Pentagram") {
+
+      class Pentagram extends JPanel {
+        setPreferredSize(new Dimension(640, 640))
+        setBackground(Color.white)
+        final private val degrees144 = Math.toRadians(144)
+
+        override def paintComponent(gg: Graphics): Unit = {
+          val g = gg.asInstanceOf[Graphics2D]
+
+          def drawPentagram(g: Graphics2D, x: Int, y: Int, fill: Color): Unit = {
+            var (_x, _y, angle) = (x, y, 0.0)
+            val p = new Path2D.Float
+            p.moveTo(_x, _y)
+            for (i <- 0 until 5) {
+              val (x2, y2) = (_x + (Math.cos(angle) * 500).toInt, _y + (Math.sin(-angle) * 500).toInt)
+              p.lineTo(x2, y2)
+              _x = x2
+              _y = y2
+              angle -= degrees144
+            }
+            p.closePath()
+            g.setColor(fill)
+            g.fill(p)
+            g.setColor(Color.darkGray)
+            g.draw(p)
+          }
+
+          super.paintComponent(gg)
+          g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON)
+          g.setStroke(new BasicStroke(5, BasicStroke.CAP_ROUND, BasicStroke.JOIN_MITER))
+          drawPentagram(g, 70, 250, new Color(0x6495ED))
+        }
+      }
+
+      add(new Pentagram, BorderLayout.CENTER)
+      pack()
+      setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE)
+      setLocationRelativeTo(null)
+      setResizable(false)
+      setVisible(true)
+    }
+  )
+
+}