color.py - add some more color methods

Adds a few methods to the color module

• to_hsv() -> [h, s, v]
• to_hsl() -> [h, s, l]
• get_complementary() -> Color
• change_hue()
• change_saturation_hsv()
• change_saturation_hsl()
• change_value()
• change_lightness()
• darken() (uses change_sat_hsl)
• brighten() (uses change_sat_hsl)
• __mul__() -> Color
• __add__() -> Color
• __sub__() -> Color

changed the description

mentioned in issue #30 (closed)

Just for reference:

Flash Usage

               text	   data	    bss	    dec	    hex	filename
Master:      159756	    500	    588	 160844	  2744c	build/pycardium/pycardium.elf
Your Branch: 161428	    500	    588	 162516	  27ad4	build/pycardium/pycardium.elf
              +1672	     +0	     +0   +1672

RAM Usage

Master:        1712
Your Branch:   2048
               +336

Thanks. I guess we can leave this open for a while and then someone needs to decide which of those make sense to include or not. I was going off the description int #30 (closed) - so I hope I didn't go too far off.

I like the functions you implemented! If it is ok, I'd like to request 3 more:

# Multiply with a scalar to dim the color.  Clamp at 0 and 255
# to ensure the color stays within bounds.
color2 = color * 0.5

# Adding two colors.  Clamped like above
color3 = color1 + color2

# Similarly, subtracting (this one is not too important)
color3 = color2 - color1

You can implement this behavior using some special methods.

Sure, will see what I can do

Thanks a lot!

added 6 commits

• e370c457...4f99f17c - 5 commits from branch card10:master
• 9f40f534 - feat(color): more methods for color manipulation

Compare with previous version

changed the description

Ooo, this is very cool!

MicroPython v1.11-37-g62f004ba4 on 2019-07-17; card10 with max32665
Type "help()" for more information.
>>> import color
>>> color.RED + color.GREEN
Color(red=255, green=255, blue=0)
>>> color.RED + color.GREEN == color.YELLOW
True

Sadly multiplication isn't quite working:

>>> color.RED * 0.5
Traceback (most recent call last):
  File "<stdin>", in <module>
TypeError: unsupported types for : 'Color', 'float'
>>> 0.5 * color.RED
Traceback (most recent call last):
  File "<stdin>", in <module>
TypeError: unsupported types for : 'float', 'Color'

It's working on CPython though so this might be a MicroPython specific problem. I'll open a bug-issue, this shouldn't block your MR. Awesome work, thank you very much!

merged

mentioned in commit ddcd810e

$ micropython
MicroPython v1.11 on 2019-07-18; linux version
Use Ctrl-D to exit, Ctrl-E for paste mode
>>> import color
>>> color.RED * 0.5
Color(red=128, green=0, blue=0)
>>> color.RED * 2
Color(red=255, green=0, blue=0)

Ah I see, it's my micropython that just works ;)

Yes, the Unix port probably has MICROPY_PY_ALL_SPECIAL_METHODS enabled while it was turned off for ours. I fixed it in ddcd810e. :)

Hey, you can now interpolate between two colors:

import leds, htmlcolor, utime

def lerp(c1, c2, t):
    return c2 * t + c1 * (1 - t)

for i in range(0, 20):
    t = i / 20
    leds.set(
        leds.TOP_LEFT,
        lerp(htmlcolor.DEEPPINK, htmlcolor.INDIGO, t),
    )
    utime.sleep_ms(50)