Data commit

Task/Plasma-effect/Gosu/plasma-effect.gosu

@@ -0,0 +1,45 @@
+uses javax.swing.*
+uses java.awt.*
+uses java.awt.image.*
+uses java.awt.event.ActionEvent
+uses java.awt.image.BufferedImage#*
+uses java.lang.Math#*
+
+var size = 400
+EventQueue.invokeLater(\ -> showPlasma())
+
+function showPlasma() {
+  var frame = new JFrame("Plasma") {:Resizable = false, :DefaultCloseOperation = JFrame.EXIT_ON_CLOSE}
+  frame.add(new Plasma(), BorderLayout.CENTER)
+  frame.pack()
+  frame.setLocationRelativeTo(null)
+  frame.Visible = true
+}
+
+class Plasma extends JPanel  {
+  var hueShift: float
+  property get plasma: float[][] = createPlasma(size, size)
+  property get img: BufferedImage = new BufferedImage(size, size, TYPE_INT_RGB)
+
+  construct() {
+    PreferredSize = new Dimension(size, size)
+    new Timer(50, \ e -> {hueShift+=0.02 repaint()}).start()
+  }
+
+  private function createPlasma(w: int, h: int): float[][] {
+    var buffer = new float[h][w]
+    for(y in 0..|h)
+      for(x in 0..|w) {
+        var value = (sin(x / 16) + sin(y / 8) + sin((x + y) / 16) + sin(sqrt(x * x + y * y) / 8) + 4) / 8
+        buffer[y][x] = value as float
+      }
+    return buffer
+  }
+
+  override function paintComponent(g: Graphics) {
+    for(y in 0..|plasma.length)
+      for(x in 0..|plasma[0].length)
+        img.setRGB(x, y, Color.HSBtoRGB(hueShift + plasma[y][x], 1, 1))
+    g.drawImage(img, 0, 0, null)
+  }
+}