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ex5_2RainbowTriangles.pyde

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+# Make Roger Antonsen's sketch "90 Rotating Equilateral Triangles" and color each triangle using stroke().
+
+def setup():
+    size(1400, 800)
+    rectMode(CENTER)
+    colorMode(HSB)
+
+t=0
+
+def draw():
+    global t
+    background(0)
+    translate(width/2, height/2)
+    rotate(radians(t))
+    for i in range(90):
+        rotate(radians(360/90)) #space the triangles evenly to cover up whole 360 degrees i.e., 4 degree each
+        pushMatrix() #save this orientation
+        translate(200,0) #go to circumference
+        rotate(radians(t+i*360/45)) #spin each triangle with phase-shifting so that Roger Antonsen's sketch can be made
+        stroke(255-i*255/90, 255, 255) #hue is varied such that a unique color can be obtained while keeping saturation and brightness constant
+        tri(t) # make a triangle of t length
+        popMatrix() #return to the saved orientation
+    t+=0.5
+
+def tri(length):
+    #Draws an equilateral triangle around centre of triangle 
+    noFill()
+    triangle(0, -length,
+             -length*sqrt(3)/2, length/2,
+             length*sqrt(3)/2, length/2)