Ram-N · August 24, 2020 03:30 · Aug 24, 2020
diff --git a/cardioid.py b/cardioid.py
@@ -0,0 +1,40 @@
+w, h = 800, 800
+
+
+def setup():
+    size(w, h)
+    stroke(0, 0, 250)  # blue
+
+
+num_steps = 200
+step = TWO_PI / num_steps
+r = 100  # Radius of both generating circles
+
+
+def draw():
+    background(250)
+    noFill()
+    strokeWeight(3)
+    translate(width / 2, height / 2)
+    ellipse(0, 0, 100, 100)  # base circle
+
+    # Every 200 frames, max_angle gets to be TWO_PI. THen it gets reset
+    max_angle = frameCount % num_steps
+    if max_angle:  # Draw the orange circle
+        fill(220, 69, 0)
+        a = max_angle * step
+        ellipse(r * cos(a), r * sin(a), 100, 100)  # large orange circle
+
+        # Let's exaggerate and show the point of contact between the two circles
+        fill(100, 255, 0)
+        x = r * (1 - cos(a)) * cos(a) + r / 2
+        y = r * (1 - cos(a)) * sin(a)
+        ellipse(x, y, 10, 10)
+
+    # This is where the cardioid gets drawn.
+    for ang in range(max_angle):
+        fill(0, 0, 250)
+        a = ang * step
+        x = r * (1 - cos(a)) * cos(a) + r / 2
+        y = r * (1 - cos(a)) * sin(a)
+        ellipse(x, y, 3, 3)  # basically the x,y point. Drawing it as an ellipse
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