Sierpinski triangle/Graphical: Difference between revisions

<lang java>import javax.swing.*;

}</lang>

=={{header|Kotlin}}==

'''From Java code:'''

<lang kotlin>import javax.swing.*

import java.awt.*

fun main(args: Array<String>)

{

var i = 8 // Default

if (args.size() >= 1)

try

{

i = Integer.parseInt(args[0])

}

catch (e: NumberFormatException)

{

println("Usage: 'java SierpinskyTriangle [level]'\nNow setting level to $i")

}

val size = 800

val panel = object : JPanel()

{

init { preferredSize = Dimension(size, size) }

public override fun paintComponent(g: Graphics)

{

g.color = Color.BLACK

val level = i

SierpinskyTriangle.drawSierpinskyTriangle(level, 20, 20, size - 40, g as Graphics2D)

}

}

val frame = JFrame("Sierpinsky Triangle - Java")

frame.defaultCloseOperation = JFrame.EXIT_ON_CLOSE

frame.add(panel)

frame.pack()

frame.isResizable = false

frame.setLocationRelativeTo(null)

frame.isVisible = true

internal object SierpinskyTriangle

{

fun drawSierpinskyTriangle(level: Int, x: Int, y: Int, size: Int, g: Graphics2D)

{

if (level > 0)

{

g.drawLine(x, y, x + size, y)

g.drawLine(x, y, x, y + size)

g.drawLine(x + size, y, x, y + size)

drawSierpinskyTriangle(level - 1, x, y, size / 2, g)

drawSierpinskyTriangle(level - 1, x + size / 2, y, size / 2, g)

drawSierpinskyTriangle(level - 1, x, y + size / 2, size / 2, g)

}

}

}</lang>