From 0282fa11230a7411691ea563a0be0ef03bd7ec4d Mon Sep 17 00:00:00 2001
From: Felix Pankratz <mail@felixpankratz.de>
Date: Wed, 21 Aug 2024 15:56:57 +0200
Subject: [PATCH] more params, refactor

---
 waves.py | 49 +++++++++++++------------------------------------
 1 file changed, 13 insertions(+), 36 deletions(-)

diff --git a/waves.py b/waves.py
index a3ccb53..1d5a594 100755
--- a/waves.py
+++ b/waves.py
@@ -10,23 +10,14 @@ from utils import random_color
 
 
 # dimensions of the output image
-WIDTH, HEIGHT = 1920, 1080
 # how much should the phases be offset?
 WAVE_OFFSET = math.pi / random.choice([1, 2, 4]) #-1.9 
-# amplitude of the sine wave
-#AMPLITUDE = 9
-# only 1 color with shades?
-MONOCHROME = True
-# works only if monochrome is set - uses todays date as base for the color
-DATE_BASED_COLOR = True
-DATE_BASED_AMPLITUDE = True
-DATE_BASED_COUNT = True
 # background black? White otherwise:
 DARK_BG = True
 # precision of the calculation
 PRECISION = 10000
 
-def days_color(date: datetime) -> tuple[float, float, float]:
+def get_color_from_date(date: datetime) -> tuple[float, float, float]:
     '''Return a color based on the progress through the year.'''
     # a day between 1 and 365 (inclusive)
     today = date.timetuple().tm_yday
@@ -35,14 +26,13 @@ def days_color(date: datetime) -> tuple[float, float, float]:
     progress = today/days_in_year
     return colorsys.hsv_to_rgb(progress, 1, 0.9)
 
-def days_amp(date: datetime, waves) -> float:
+def get_amplitude_from_date(date: datetime, waves) -> float:
     '''Return the amplitude of waves, based on progress through the month.'''
     days_in_month = calendar.monthrange(date.year, date.month)[1]
     max_amp = 1/waves/2
     return date.day/days_in_month * max_amp
 
-def create_wpotd(width: int, height: int):
-    #TODO: return a `file`-like object
+def create_wpotd(width: int, height: int, date: datetime = datetime.now(), dark: bool = True) -> cairo.ImageSurface:
     surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
     ctx = cairo.Context(surface)
 
@@ -51,36 +41,25 @@ def create_wpotd(width: int, height: int):
 
     lastpoints = [(x/PRECISION, 0) for x in range(PRECISION+1)]
 
-    date = datetime.today()
     frequency = random.randint(10, 40)
-    if DATE_BASED_COUNT:
-        # generate as many waves as the number of the current month
-        waves = date.month
-    else:
-        waves = 12
-    if DATE_BASED_AMPLITUDE:
-        amplitude = days_amp(date, waves)
-    else:
-        amplitude = 25
-    if MONOCHROME:
-        if DATE_BASED_COLOR:
-            r, g, b = days_color(date) #datetime.datetime.now())
-        else:
-            r, g, b = random_color()
+    waves = date.month
+    amplitude = get_amplitude_from_date(date, waves)
+
+    r, g, b = get_color_from_date(date)
     alpha_step = 1/waves
 
-    if DARK_BG:
+    ctx.rectangle(0, 0, 1, 1)
+    if dark:
         # make bg black
-        ctx.rectangle(0, 0, 1, 1)
         ctx.set_source_rgb(0, 0, 0)
-        ctx.fill()
+    else:
+        ctx.set_source_rgb(255, 255, 255)
+    ctx.fill()
 
     wave_height = 1/waves
     step_size = 1/PRECISION
 
     for wave_index in range(waves+1):
-        if not MONOCHROME:
-            r, g, b = random_color()
         points = []
         x = 0
         while x < 1:
@@ -89,8 +68,6 @@ def create_wpotd(width: int, height: int):
             points.append((x, (y + (0.5 + wave_index)*wave_height)))
             x += step_size
         #print(f'Draw {len(points)} points for curve {num}')
-        if not MONOCHROME:
-            ctx.set_source_rgb(r, g, b)
         else:
             # make more transparent toward bottom
             ctx.set_source_rgba(r, g, b, 1 - (alpha_step * wave_index)) 
@@ -109,7 +86,7 @@ def create_wpotd(width: int, height: int):
     #surface.write_to_png(output)  # Output to PNG
 
 def main():
-    output = create_wpotd(1920, 1080)
+    output = create_wpotd(1920, 1080, dark=False)
     output.write_to_png('out/waves.png')
 
 if __name__ == '__main__':