Data commit

Task/Sierpinski-triangle-Graphical/Kotlin/sierpinski-triangle-graphical.kotlin

@@ -0,0 +1,53 @@
+import java.awt.*
+import javax.swing.JFrame
+import javax.swing.JPanel
+
+fun main(args: Array<String>) {
+    var i = 8     // Default
+    if (args.any()) {
+        try {
+            i = args.first().toInt()
+        } catch (e: NumberFormatException) {
+            i = 8
+            println("Usage: 'java SierpinskyTriangle [level]'\nNow setting level to $i")
+        }
+    }
+
+    object : JFrame("Sierpinsky Triangle - Kotlin") {
+        val panel = object : JPanel() {
+            val size = 800
+
+            init {
+                preferredSize = Dimension(size, size)
+            }
+
+            public override fun paintComponent(g: Graphics) {
+                g.color = Color.BLACK
+                if (g is Graphics2D) {
+                    g.drawSierpinskyTriangle(i, 20, 20, size - 40)
+                }
+            }
+        }
+
+        init {
+            defaultCloseOperation = JFrame.EXIT_ON_CLOSE
+            add(panel)
+            pack()
+            isResizable = false
+            setLocationRelativeTo(null)
+            isVisible = true
+        }
+    }
+}
+
+internal fun Graphics2D.drawSierpinskyTriangle(level: Int, x: Int, y: Int, size: Int) {
+    if (level > 0) {
+        drawLine(x, y, x + size, y)
+        drawLine(x, y, x, y + size)
+        drawLine(x + size, y, x, y + size)
+
+        drawSierpinskyTriangle(level - 1, x, y, size / 2)
+        drawSierpinskyTriangle(level - 1, x + size / 2, y, size / 2)
+        drawSierpinskyTriangle(level - 1, x, y + size / 2, size / 2)
+    }
+}