update makefile for calling python script

2 files changed, 4 insertions, 4 deletions

diff --git a/src/bitmap-ball.py b/src/bitmap-ball.py
index d28609c..4d5be0c 100755
--- a/src/bitmap-ball.py
+++ b/src/bitmap-ball.py
@@ -1,14 +1,14 @@
 #!/bin/python3
 
 from PIL import Image
-import os
+import sys
 
 WIDTH = 10
 HEIGHT = 10
 
 # return array of 12-bit color values (0bRRRGGGBBB)
 def pixeldata():
-  image = Image.open("./ball.png")
+  image = Image.open(sys.argv[-1]) # use last argument as input image file
   pixels = image.load()
   pixarr = []
   for x in range(WIDTH):
diff --git a/src/makefile b/src/makefile
index 2906e87..5dff86d 100644
--- a/src/makefile
+++ b/src/makefile
@@ -1,6 +1,6 @@
 pixeldata-ball.vhd: pixeldata-ball-top.vhd bitmap-ball.vhd pixeldata-ball-bottom.vhd
 	cat $^ > $@
 
-bitmap-ball.vhd: bitmap-ball.py
-	python3 $< > $@
+bitmap-ball.vhd: ball.png
+	python3 bitmap-ball.py $< > $@