Greyscale bars/Display: Difference between revisions

=={{header|Kotlin}}==

{{trans|Java}}

<lang scala>// version 1.0.6

import javax.swing.*

import java.awt.*

class GreyBars(): JFrame("grey bars example!") {

private val w: Int

private val h: Int

init {

w = 640

h = 320

setSize(w, h)

defaultCloseOperation = JFrame.EXIT_ON_CLOSE

setVisible(true)

}

override fun paint(g: Graphics) {

var run = 0

var colorComp: Double // component of the color

var columnCount = 8

while (columnCount < 128) {

var colorGap = 255.0 / (columnCount - 1) // by this gap we change the background color

val columnWidth = w / columnCount

val columnHeight = h / 4

if (run % 2 == 0) // switches color directions with each iteration of while loop

colorComp = 0.0

else {

colorComp = 255.0

colorGap *= -1.0

}

val ystart = columnHeight * run

var xstart = 0

for (i in 0 until columnCount) {

val iColor = Math.round(colorComp).toInt()

val nextColor = Color(iColor, iColor, iColor)

g.color = nextColor

g.fillRect(xstart, ystart, columnWidth, columnHeight)

xstart += columnWidth

colorComp += colorGap

}

run++

columnCount *= 2

}

}

}

fun main(args: Array<String>) {

GreyBars()

}</lang>