more example moving

java/examples/Books/Processing Handbook/Extensions/Sound/Ex_05/Ex_05.pde

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+/**
+Analyzes a sound file using a Fast Fourier Transform, and plots both the current
+spectral frame and a "peak-hold" plot of the maximum over time using logarithmic
+scaling. Based on examples by Krister Olsson <http://tree-axis.com>
+*/
+import krister.Ess.*;
+
+AudioChannel myChannel;
+FFT myFFT;
+int bands = 256; // Number of FFT frequency bands to calculate
+
+void setup() {
+  size(1024, 200);
+  Ess.start(this); // Start Ess
+// Load "test.aif" into a new AudioChannel, file must be in the "data" folder
+  myChannel = new AudioChannel("test.aif");
+  myChannel.play(Ess.FOREVER);
+  myFFT = new FFT(bands * 2); // We want 256 frequency bands, so we pass in 512
+}
+
+void draw() {
+  background(176);
+// Get spectrum
+  myFFT.getSpectrum(myChannel);
+// Draw FFT data
+  stroke(255);
+  for (int i = 0; i < bands; i++) {
+    float x = width - pow(1024, (255.0 - i) / bands);
+    float maxY = max(0, myFFT.maxSpectrum[i] * height * 2);
+    float freY = max(0, myFFT.spectrum[i] * height * 2);
+// Draw maximum lines
+    stroke(255);
+    line(x, height, x, height - maxY);
+// Draw frequency lines
+    stroke(0);
+    line(x, height, x, height - freY);
+  }
+}
+
+public void stop() {
+  Ess.stop(); // When program stops, stop Ess too
+  super.stop();
+}