Plasma effect: Difference between revisions

}

}</lang>

=={{header|Kotlin}}==

{{trans|Java}}

<lang scala>// version 1.1.1

import java.awt.*

import java.awt.image.BufferedImage

import javax.swing.*

class PlasmaEffect : JPanel() {

private val plasma: Array<FloatArray>

private var hueShift = 0.0f

private val img: BufferedImage

init {

val dim = Dimension(640, 640)

preferredSize = dim

background = Color.white

img = BufferedImage(dim.width, dim.height, BufferedImage.TYPE_INT_RGB)

plasma = createPlasma(dim.height, dim.width)

// animate about 24 fps and shift hue value with every frame

Timer(42) {

hueShift = (hueShift + 0.02f) % 1

repaint()

}.start()

}

private fun createPlasma(w: Int, h: Int): Array<FloatArray> {

val buffer = Array(h) { FloatArray(w) }

for (y in 0 until h)

for (x in 0 until w) {

var value = Math.sin(x / 16.0)

value += Math.sin(y / 8.0)

value += Math.sin((x + y) / 16.0)

value += Math.sin(Math.sqrt((x * x + y * y).toDouble()) / 8.0)

value += 4.0 // shift range from -4 .. 4 to 0 .. 8

value /= 8.0 // bring range down to 0 .. 1

if (value < 0.0 || value > 1.0) throw RuntimeException("Hue value out of bounds")

buffer[y][x] = value.toFloat()

}

return buffer

}

private fun drawPlasma(g: Graphics2D) {

val h = plasma.size

val w = plasma[0].size

for (y in 0 until h)

for (x in 0 until w) {

val hue = hueShift + plasma[y][x] % 1

img.setRGB(x, y, Color.HSBtoRGB(hue, 1.0f, 1.0f))

}

g.drawImage(img, 0, 0, null)

}

override fun paintComponent(gg: Graphics) {

super.paintComponent(gg)

val g = gg as Graphics2D

g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON)

drawPlasma(g);

}

}

fun main(args: Array<String>) {

SwingUtilities.invokeLater {

val f = JFrame()

f.defaultCloseOperation = JFrame.EXIT_ON_CLOSE

f.title = "Plasma Effect"

f.isResizable = false

f.add(PlasmaEffect(), BorderLayout.CENTER)

f.pack()

f.setLocationRelativeTo(null)

f.isVisible = true