From 1c4def7320176d8e97d2639810cb767cfb96059c Mon Sep 17 00:00:00 2001
From: Jonathan Feinberg <jdf@pobox.com>
Date: Sun, 4 May 2014 21:13:19 -0400
Subject: [PATCH] Add Python processing examples.

---
 samples/Python/AdditiveWave.pyde | 63 ++++++++++++++++++++++++++++++++
 samples/Python/MoveEye.pyde      | 29 +++++++++++++++
 2 files changed, 92 insertions(+)
 create mode 100644 samples/Python/AdditiveWave.pyde
 create mode 100644 samples/Python/MoveEye.pyde

diff --git a/samples/Python/AdditiveWave.pyde b/samples/Python/AdditiveWave.pyde
new file mode 100644
index 00000000..d02f15a0
--- /dev/null
+++ b/samples/Python/AdditiveWave.pyde
@@ -0,0 +1,63 @@
+"""
+Additive Wave
+by Daniel Shiffman. 
+
+Create a more complex wave by adding two waves together. 
+"""
+
+xspacing = 8    # How far apart should each horizontal location be spaced
+maxwaves = 4    # total # of waves to add together
+theta = 0.0
+
+amplitude = []  # Height of wave
+# Value for incrementing X, to be calculated as a function of period and
+# xspacing
+dx = []
+yvalues = []
+
+
+def setup():
+    size(640, 360)
+    frameRate(30)
+    colorMode(RGB, 255, 255, 255, 100)
+    w = width + 16
+    for i in range(maxwaves):
+        amplitude.append(random(10, 30))
+        period = random(100, 300)  # How many pixels before the wave repeats
+        dx.append((TWO_PI / period) * xspacing)
+    for _ in range(w / xspacing + 1):
+        yvalues.append(0.0)
+
+
+def draw():
+    background(0)
+    calcWave()
+    renderWave()
+
+
+def calcWave():
+    # Increment theta (try different values for 'angular velocity' here
+    theta += 0.02
+    # Set all height values to zero
+    for i in range(len(yvalues)):
+        yvalues[i] = 0
+    # Accumulate wave height values
+    for j in range(maxwaves):
+        x = theta
+        for i in range(len(yvalues)):
+            # Every other wave is cosine instead of sine
+            if j % 2 == 0:
+                yvalues[i] += sin(x) * amplitude[j]
+            else:
+                yvalues[i] += cos(x) * amplitude[j]
+            x += dx[j]
+
+
+def renderWave():
+    # A simple way to draw the wave with an ellipse at each location
+    noStroke()
+    fill(255, 50)
+    ellipseMode(CENTER)
+    for x, v in enumerate(yvalues):
+        ellipse(x * xspacing, height / 2 + v, 16, 16)
+
diff --git a/samples/Python/MoveEye.pyde b/samples/Python/MoveEye.pyde
new file mode 100644
index 00000000..310c8efb
--- /dev/null
+++ b/samples/Python/MoveEye.pyde
@@ -0,0 +1,29 @@
+"""
+ * Move Eye. 
+ * by Simon Greenwold.
+ * 
+ * The camera lifts up (controlled by mouseY) while looking at the same point.
+ """
+
+
+def setup():
+    size(640, 360, P3D)
+    fill(204)
+
+
+def draw():
+    lights()
+    background(0)
+
+    # Change height of the camera with mouseY
+    camera(30.0, mouseY, 220.0,  # eyeX, eyeY, eyeZ
+           0.0, 0.0, 0.0,        # centerX, centerY, centerZ
+           0.0, 1.0, 0.0)        # upX, upY, upZ
+
+    noStroke()
+    box(90)
+    stroke(255)
+    line(-100, 0, 0, 100, 0, 0)
+    line(0, -100, 0, 0, 100, 0)
+    line(0, 0, -100, 0, 0, 100)
+