71 lines
2.3 KiB
Kotlin
71 lines
2.3 KiB
Kotlin
// version 1.1.2
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import java.awt.*
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import java.awt.image.BufferedImage
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import javax.swing.*
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class PlasmaEffect : JPanel() {
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private val plasma: Array<FloatArray>
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private var hueShift = 0.0f
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private val img: BufferedImage
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init {
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val dim = Dimension(640, 640)
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preferredSize = dim
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background = Color.white
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img = BufferedImage(dim.width, dim.height, BufferedImage.TYPE_INT_RGB)
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plasma = createPlasma(dim.height, dim.width)
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// animate about 24 fps and shift hue value with every frame
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Timer(42) {
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hueShift = (hueShift + 0.02f) % 1
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repaint()
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}.start()
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}
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private fun createPlasma(w: Int, h: Int): Array<FloatArray> {
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val buffer = Array(h) { FloatArray(w) }
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for (y in 0 until h)
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for (x in 0 until w) {
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var value = Math.sin(x / 16.0)
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value += Math.sin(y / 8.0)
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value += Math.sin((x + y) / 16.0)
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value += Math.sin(Math.sqrt((x * x + y * y).toDouble()) / 8.0)
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value += 4.0 // shift range from -4 .. 4 to 0 .. 8
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value /= 8.0 // bring range down to 0 .. 1
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if (value < 0.0 || value > 1.0) throw RuntimeException("Hue value out of bounds")
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buffer[y][x] = value.toFloat()
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}
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return buffer
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}
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private fun drawPlasma(g: Graphics2D) {
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val h = plasma.size
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val w = plasma[0].size
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for (y in 0 until h)
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for (x in 0 until w) {
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val hue = hueShift + plasma[y][x] % 1
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img.setRGB(x, y, Color.HSBtoRGB(hue, 1.0f, 1.0f))
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}
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g.drawImage(img, 0, 0, null)
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}
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override fun paintComponent(gg: Graphics) {
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super.paintComponent(gg)
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val g = gg as Graphics2D
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g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON)
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drawPlasma(g);
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}
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}
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fun main(args: Array<String>) {
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SwingUtilities.invokeLater {
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val f = JFrame()
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f.defaultCloseOperation = JFrame.EXIT_ON_CLOSE
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f.title = "Plasma Effect"
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f.isResizable = false
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f.add(PlasmaEffect(), BorderLayout.CENTER)
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f.pack()
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f.setLocationRelativeTo(null)
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f.isVisible = true
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}
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}
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