Data commit

Task/Pentagram/Kotlin/pentagram.kotlin

@@ -0,0 +1,60 @@
+// version 1.1.2
+
+import java.awt.*
+import java.awt.geom.Path2D
+import javax.swing.*
+
+class Pentagram : JPanel() {
+    init {
+        preferredSize = Dimension(640, 640)
+        background = Color.white
+    }
+
+    private fun drawPentagram(g: Graphics2D, len: Int, x: Int, y: Int,
+                              fill: Color, stroke: Color) {
+        var x2 = x.toDouble()
+        var y2 = y.toDouble()
+        var angle = 0.0
+        val p = Path2D.Float()
+        p.moveTo(x2, y2)
+
+        for (i in 0..4) {
+            x2 += Math.cos(angle) * len
+            y2 += Math.sin(-angle) * len
+            p.lineTo(x2, y2)
+            angle -= Math.toRadians(144.0)
+        }
+
+        p.closePath()
+        with(g) {
+            color = fill
+            fill(p)
+            color = stroke
+            draw(p)
+        }
+    }
+
+    override fun paintComponent(gg: Graphics) {
+        super.paintComponent(gg)
+        val g = gg as Graphics2D
+        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
+                           RenderingHints.VALUE_ANTIALIAS_ON)
+        g.stroke = BasicStroke(5.0f, BasicStroke.CAP_ROUND, 0)
+        drawPentagram(g, 500, 70, 250, Color(0x6495ED), Color.darkGray)
+    }
+}
+
+fun main(args: Array<String>) {
+    SwingUtilities.invokeLater {
+        val f = JFrame()
+        with(f) {
+            defaultCloseOperation = JFrame.EXIT_ON_CLOSE
+            title = "Pentagram"
+            isResizable = false
+            add(Pentagram(), BorderLayout.CENTER)
+            pack()
+            setLocationRelativeTo(null)
+            isVisible = true
+        }
+    }
+}