comments day 25

sketch_180125c/sketch_180125c.pyde

@@ -2,8 +2,8 @@
 s18025c - Alexandre B A Villares
 https://abav.lugaralgum.com/sketch-a-day
 
-Move the cursor over the image to draw
-the 'brush' responds to the speed of the mouse.
+Drag the mouse over the canvas to draw
+'brush' strokeWeight() varies with mouse speed.
 """
 
 pspeed = 0
@@ -15,12 +15,12 @@ def setup():
 def draw():
     global pspeed
     x, y, px, py = mouseX, mouseY, pmouseX, pmouseY
-    speed = (dist(x, y, px, py))**0.5
-    w = ((10 - speed) + (10 - pspeed))/2
+    speed = (dist(x, y, px, py))**0.5 # squareroot of dist to previous mouse pos
+    w = ((10 - speed) + (10 - pspeed))/2 # mean of 10 minus speed & previous
     strokeWeight(abs(w))
     if mousePressed:
         line(x, y, px, py)
-    pspeed = speed
+    pspeed = speed # updates previous speed
 
 def keyPressed():
     background(200)