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from url import URLAccumulator
from urllib import quote
from cache import Cache
from xml.dom import minidom
import colorsys
def clear_cache():
Cache("kuler").clear()
### COLOR MODELS #####################################################################################
def cmyk_to_rgb(c, m, y, k):
r = 1.0 - (c+k)
g = 1.0 - (m+k)
b = 1.0 - (y+k)
return r, g, b
def hex_to_rgb(hex):
hex = hex.lstrip("#")
if len(hex) < 6:
hex += hex[-1] * (6-len(hex))
r, g, b = hex[0:2], hex[2:4], hex[4:]
r, g, b = [int(n, 16) for n in (r, g, b)]
return (r/255.0, g/255.0, b/255.0)
def lab_to_rgb(l, a, b):
""" Converts CIE Lab to RGB components.
First we have to convert to XYZ color space.
Conversion involves using a white point,
in this case D65 which represents daylight illumination.
Algorithms adopted from:
http://www.easyrgb.com/math.php
"""
y = (l+16) / 116.0
x = a/500.0 + y
z = y - b/200.0
v = [x,y,z]
for i in range(3):
if pow(v[i],3) > 0.008856:
v[i] = pow(v[i],3)
else:
v[i] = (v[i]-16/116.0) / 7.787
# Observer = 2, Illuminant = D65
x = v[0] * 95.047/100
y = v[1] * 100.0/100
z = v[2] * 108.883/100
r = x * 3.2406 + y *-1.5372 + z *-0.4986
g = x *-0.9689 + y * 1.8758 + z * 0.0415
b = x * 0.0557 + y *-0.2040 + z * 1.0570
v = [r,g,b]
for i in range(3):
if v[i] > 0.0031308:
v[i] = 1.055 * pow(v[i], 1/2.4) - 0.055
else:
v[i] = 12.92 * v[i]
#r, g, b = v[0]*255, v[1]*255, v[2]*255
r, g, b = v[0], v[1], v[2]
return r, g, b
### KULER THEME ######################################################################################
class KulerTheme(list):
def __init__(self):
self.id = 0
self.author = u""
self.label = u""
self.tags = []
def _darkest(self):
""" Returns the darkest swatch.
Knowing the contract between a light and a dark swatch
can help us decide how to display readable typography.
"""
rgb, n = (1.0, 1.0, 1.0), 3.0
for r,g,b in self:
if r+g+b < n:
rgb, n = (r,g,b), r+g+b
return rgb
darkest = property(_darkest)
def _lightest(self):
""" Returns the lightest swatch.
"""
rgb, n = (0.0, 0.0, 0.0), 0.0
for r,g,b in self:
if r+g+b > n:
rgb, n = (r,g,b), r+g+b
return rgb
lightest = property(_lightest)
def draw(self, x, y, w=40, h=40):
try: from web import _ctx
except: pass
from nodebox.graphics import RGB
for r,g,b in self:
_ctx.colormode(RGB)
_ctx.fill(r,g,b)
_ctx.rect(x, y, w, h)
x += w
### KULER ############################################################################################
class Kuler(list, URLAccumulator):
def __init__(self, q, page=0, wait=10, asynchronous=False, cached=True):
""" Parses color themes from Adobe Kuler.
Valid queries are "popular", "rating",
a theme id as an integer, or a search string.
"""
if cached:
cache = "kuler"
else:
cache = None
# Requests for search, popular, rating and id have different url.
url = "http://kuler.adobe.com/kuler/services/"
self.id_string = url + "theme/get.cfm?themeId="
if isinstance(q, int):
url = self.id_string + str(q)
elif q in ["popular", "rating"]:
url += "theme/getList.cfm?listType="+q
url += "&startIndex="+str(page*30)+"&itemsPerPage=30"
else:
url += "search/get.cfm?searchQuery="+quote(q)
url += "&startIndex="+str(page*30)+"&itemsPerPage=30"
# Refresh cached results every day
# for highest rating or popular requests.
if q in ["popular", "rating"]:
if cached and Cache(cache).age(url) > 0:
Cache(cache).remove(url)
URLAccumulator.__init__(self, url, wait, asynchronous, cache, type=".xml", throttle=3)
def load(self, data):
if data == "": return
if data.find("<recordCount>0</recordCount>") > 0: return
dom = minidom.parseString(data)
for theme in dom.getElementsByTagName("theme"):
try:
self.append(self.parse_theme(theme))
except:
pass
def parse_tag(self, xml, tag):
return xml.getElementsByTagName(tag)[0].childNodes[0].nodeValue
def parse_theme(self, xml):
""" Parses a theme from XML returned by Kuler.
Gets the theme's id, label and swatches.
All of the swatches are converted to RGB.
If we have a full description for a theme id in cache,
parse that to get tags associated with the theme.
"""
kt = KulerTheme()
kt.author = xml.getElementsByTagName("author")[0]
kt.author = kt.author.childNodes[1].childNodes[0].nodeValue
kt.id = int(self.parse_tag(xml, "id"))
kt.label = self.parse_tag(xml, "label")
mode = self.parse_tag(xml, "mode")
for swatch in xml.getElementsByTagName("swatch"):
c1 = float(self.parse_tag(swatch, "c1"))
c2 = float(self.parse_tag(swatch, "c2"))
c3 = float(self.parse_tag(swatch, "c3"))
c4 = float(self.parse_tag(swatch, "c4"))
if mode == "rgb":
kt.append((c1,c2,c3))
if mode == "cmyk":
kt.append(cmyk_to_rgb(c1,c2,c3,c4))
if mode == "hsv":
kt.append(colorsys.hsv_to_rgb(c1,c2,c3))
if mode == "hex":
kt.append(hex_to_rgb(c1))
if mode == "lab":
kt.append(lab_to_rgb(c1,c2,c3))
# If we have the full theme in cache,
# parse tags from it.
if self._cache.exists(self.id_string + str(kt.id)):
xml = self._cache.read(self.id_string + str(kt.id))
xml = minidom.parseString(xml)
for tags in xml.getElementsByTagName("tag"):
tags = self.parse_tag(tags, "label")
tags = tags.split(" ")
kt.tags.extend(tags)
return kt
######################################################################################################
def search_by_popularity(page=0, wait=10, asynchronous=False, cached=True):
return Kuler("popular", page, wait, asynchronous, cached)
def search_by_rating(page=0, wait=10, asynchronous=False, cached=True):
return Kuler("rating", page, wait, asynchronous, cached)
def search(q, page=0, wait=10, asynchronous=False, cached=True):
return Kuler(str(q), page, wait, asynchronous, cached)
def search_by_id(id, page=0, wait=10, asynchronous=False, cached=True):
return Kuler(int(id), page, wait, asynchronous, cached)
######################################################################################################
def preview(theme):
try: from web import _ctx
except: pass
# Use the darkest swatch as background.
r,g,b = theme.darkest
c = _ctx.color(r, g, b)
c.brightness *= 0.5
c.brightness = max(0.1, c.brightness)
c.brightness = 0.15
_ctx.background(c)
#_ctx.background(0.1)
from random import random, choice
for i in range(100):
r,g,b = choice(theme)
_ctx.fill(r,g,b)
r,g,b = choice(theme)
_ctx.stroke(r,g,b)
_ctx.strokewidth(random()*30)
r = random()*100
_ctx.oval(random()*400, random()*400, r, r)
# Draw swatches.
_ctx.nostroke()
theme.draw(20, 480)
# Theme info colored in the lightest swatch.
r,g,b = theme.lightest
_ctx.fontsize(18)
_ctx.fill(r,g,b)
_ctx.text(theme.label + u" | " + str(theme.id), 20, 540)
_ctx.fontsize(_ctx.fontsize()/2)
_ctx.text(", ".join(theme.tags), 20, 555, width=400)
#size(500, 650)
#themes = search("rating")
##for theme in themes[:10]: Kuler(theme.id)
#theme = themes[0]
#preview(theme)
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