Implement unit circle example

`unit_circle.sh` generates a animated GIF of the circle states between
p=1 and p=3.

1 files changed, 17 insertions, 0 deletions

diff --git a/unit_circle.sh b/unit_circle.sh
new file mode 100644
index 0000000..40c834f
--- /dev/null
+++ b/unit_circle.sh
@@ -0,0 +1,17 @@
+#! /usr/bin/fish
+
+mkdir unit ^/dev/null
+cd unit
+rm *.ppm *.gif ^/dev/null
+
+../unit_circle
+
+for f in unit_circle_*
+	convert $f -annotate +75+120 (echo "p =" (echo $f | grep -o "[0-9].[0-9]\{2\}" | head -n 1)) $f
+end
+
+convert -delay 8 -loop 0 *.ppm circle.gif
+convert -reverse circle.gif circle_reversed.gif
+convert circle.gif circle_reversed.gif circle_cycle.gif
+
+cd ..