15a

2020/sketch_2020_07_15a/sketch_2020_07_15a.pyde

@@ -0,0 +1,36 @@
+# LerpVectorsSimplified
+# 2019-04 Processing 3.4 - based on LerpVectorsExample by Jeremy Douglass
+# 2020-07 ported to Python Mode by Alexandre Villares
+
+vecs = []
+
+def setup():
+    size(200, 200)
+    # mark path points
+    vecs.append(PVector(10, 10))
+    vecs.append(PVector(width - 10, 10))
+    vecs.append(PVector(width - 10, height - 10))
+    vecs.append(PVector(10, height - 10))
+    vecs.append(PVector(width / 2, height / 2))
+    fill(0, 0, 255)
+
+
+def draw():
+    background(255)
+    time = millis() / 2 % 4000    # a clock that counts up to 4000 and starts over
+    # from -1 to 1, then starts over
+    sawtoothWave = map(time, 0, 3999, -1, 1)
+    triangleWave = abs(sawtoothWave)    # bounces 0-1-0-1-0
+    # find our location in 2D path based on 0-1
+    loc = lerpVectors(triangleWave, vecs)
+    ellipse(loc.x, loc.y, 20, 20)    # draw at the location
+
+
+# based on an amount, find the location along a path made of points
+def lerpVectors(amt, vecs):
+    if len(vecs) == 1:
+        return vecs[0]
+    cunit = 1.0 / (len(vecs) - 1)
+    return PVector.lerp(vecs[floor(amt / cunit)],
+                        vecs[ceil(amt / cunit)],
+                        amt % cunit / cunit)

README.md

@@ -21,6 +21,12 @@
 
 ---
 
+![sketch_2020_07_15a](2020/sketch_2020_07_15a/sketch_2020_07_15a.gif)
+
+[sketch_2020_07_15a](https://github.com/villares/sketch-a-day/tree/master/2020/sketch_2020_07_15a) [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)]
+
+---
+
 ![sketch_2020_07_14a](2020/sketch_2020_07_14a/sketch_2020_07_14a.png)
 ![sketch_2020_07_14b](2020/sketch_2020_07_14b/sketch_2020_07_14b.png)
 ![sketch_2020_07_14c](2020/sketch_2020_07_14c/sketch_2020_07_14c.png)