Voronoi diagram: Difference between revisions

=={{header|Scala}}==

===Java Swing Interoperability===

{{libheader|Scala Java Swing interoperability}}

{{works with|Scala 2.13}}

<lang Scala>import java.awt.geom.Ellipse2D

import java.awt.image.BufferedImage

import java.awt.{Color, Graphics, Graphics2D}

import scala.math.sqrt

object Voronoi extends App {

private val (cells, dim) = (100, 1000)

private val rand = new scala.util.Random

private val color = Vector.fill(cells)(rand.nextInt(0x1000000))

private val image = new BufferedImage(dim, dim, BufferedImage.TYPE_INT_RGB)

private val g: Graphics2D = image.createGraphics()

private val px = Vector.fill(cells)(rand.nextInt(dim))

private val py = Vector.fill(cells)(rand.nextInt(dim))

for (x <- 0 until dim;

y <- 0 until dim) {

var n = 0

def distance(x1: Int, x2: Int, y1: Int, y2: Int) =

sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2).toDouble) // Euclidian

for (i <- px.indices

if distance(px(i), x, py(i), y) < distance(px(n), x, py(n), y))

n = i

image.setRGB(x, y, color(n))

}

g.setColor(Color.BLACK)

for (i <- px.indices) g.fill(new Ellipse2D.Double(px(i) - 2.5, py(i) - 2.5, 5, 5))

new javax.swing.JFrame("Voronoi Diagram") {

override def paint(g: Graphics): Unit = {g.drawImage(image, 0, 0, this); ()}

setBounds(0, 0, dim, dim)

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE)

setLocationRelativeTo(null)

setResizable(false)

setVisible(true)

}

}</lang>