From 18bcecf7b3882a8d34a581c99bc293751fbae4c7 Mon Sep 17 00:00:00 2001
From: Sunpy <sunpy@osufx.com>
Date: Wed, 12 Feb 2020 14:10:50 +0100
Subject: [PATCH] Added polkadots

---
 shaders/background.py |  2 +-
 shaders/default.py    |  2 +-
 shaders/polkadots.py  | 37 +++++++++++++++++++++++++++++++++++++
 shaders/wave.py       |  2 +-
 4 files changed, 40 insertions(+), 3 deletions(-)
 create mode 100644 shaders/polkadots.py

diff --git a/shaders/background.py b/shaders/background.py
index e32d814..72199b9 100644
--- a/shaders/background.py
+++ b/shaders/background.py
@@ -1,7 +1,7 @@
 import math
 from pixel import Pixel
 
-def main(pixel: Pixel, resolution: tuple, frag_coord: tuple, time: float):
+def main(pixel: Pixel, resolution: tuple, frag_coord: tuple, time: float): # https://www.shadertoy.com/view/lsyyz3
 	uv = (frag_coord[0] / resolution[0], frag_coord[1] / resolution[1])
 
 	h = math.sin(uv[0] * math.pi + uv[1] * 10.0 + time + math.cos(uv[0] * uv[1] + uv[1] * 7.1823) * math.sin(uv[0] * 14.2))
diff --git a/shaders/default.py b/shaders/default.py
index 0289551..07a3313 100644
--- a/shaders/default.py
+++ b/shaders/default.py
@@ -1,7 +1,7 @@
 import math
 from pixel import Pixel
 
-def main(pixel: Pixel, resolution: tuple, frag_coord: tuple, time: float):
+def main(pixel: Pixel, resolution: tuple, frag_coord: tuple, time: float): # default shader when creating a new shader on shadertoy
 	uv = (frag_coord[0] / resolution[0], frag_coord[1] / resolution[1])
 
 	pixel.background_color.set(
diff --git a/shaders/polkadots.py b/shaders/polkadots.py
new file mode 100644
index 0000000..d0354bf
--- /dev/null
+++ b/shaders/polkadots.py
@@ -0,0 +1,37 @@
+import math
+from pixel import Pixel
+
+COLOR_A = (0.0, 0.7, 0.8)
+COLOR_B = (0.8, 0.0, 0.7)
+
+HEIGHT = 6.0
+RADIUS = 1.
+
+def distance(a: tuple, b: tuple) -> float:
+	if len(a) != len(b):
+		raise TypeError("Mismatching dimentional vector passed")
+
+	dist = 0
+	for i in range(len(a)):
+		d = b[i] - a[i]
+		dist += d * d
+
+	return dist ** 0.5
+
+def get_col(uv: tuple) -> tuple:
+	uv = tuple(math.floor(x) for x in uv)
+	return COLOR_A if ((uv[0] + uv[1]) % 2) == 0.0 else COLOR_B
+
+def main(pixel: Pixel, resolution: tuple, frag_coord: tuple, time: float): # https://www.shadertoy.com/view/lsyyDK
+	uv = [ x * HEIGHT for x in (frag_coord[0] / resolution[1], frag_coord[1] / resolution[1]) ]
+
+	direction = int(time) % 2
+	shift = math.floor(uv[1 - direction])
+	shift = 2.0 * (shift % 2) - 1.0
+	uv[direction] += shift * time
+
+	dist = 1.0 - distance((0.0, 0.0), tuple((x % 1.0) - 0.5 for x in uv)) / RADIUS
+
+	col = tuple(x * dist for x in get_col(uv))
+
+	pixel.background_color.set( *col )
\ No newline at end of file
diff --git a/shaders/wave.py b/shaders/wave.py
index 852c3fa..7ce858c 100644
--- a/shaders/wave.py
+++ b/shaders/wave.py
@@ -1,7 +1,7 @@
 import math
 from pixel import Pixel
 
-def main(pixel: Pixel, resolution: tuple, frag_coord: tuple, time: float):
+def main(pixel: Pixel, resolution: tuple, frag_coord: tuple, time: float): # https://www.shadertoy.com/view/Wd23W3
 	uv = (frag_coord[0] / resolution[0], frag_coord[1] / resolution[1])
 
 	def hsv2rgb(h, s, v) -> tuple: