51 lines
1.4 KiB
Kotlin
51 lines
1.4 KiB
Kotlin
// version 1.1
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import java.awt.Color
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import java.awt.Graphics
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import javax.swing.JFrame
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class GreyBars : JFrame("grey bars example!") {
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private val w: Int
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private val h: Int
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init {
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w = 640
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h = 320
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setSize(w, h)
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defaultCloseOperation = JFrame.EXIT_ON_CLOSE
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isVisible = true
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}
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override fun paint(g: Graphics) {
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var run = 0
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var colorComp: Double // component of the color
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var columnCount = 8
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while (columnCount < 128) {
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var colorGap = 255.0 / (columnCount - 1) // by this gap we change the background color
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val columnWidth = w / columnCount
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val columnHeight = h / 4
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if (run % 2 == 0) // switches color directions with each iteration of while loop
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colorComp = 0.0
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else {
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colorComp = 255.0
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colorGap *= -1.0
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}
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val ystart = columnHeight * run
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var xstart = 0
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for (i in 0 until columnCount) {
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val iColor = Math.round(colorComp).toInt()
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val nextColor = Color(iColor, iColor, iColor)
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g.color = nextColor
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g.fillRect(xstart, ystart, columnWidth, columnHeight)
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xstart += columnWidth
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colorComp += colorGap
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}
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run++
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columnCount *= 2
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}
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}
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}
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fun main(args: Array<String>) {
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GreyBars()
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}
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