Data commit

Task/Plasma-effect/Kotlin/plasma-effect.kotlin

@@ -0,0 +1,71 @@
+// version 1.1.2
+
+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
+    }
+}