def makeImage(self, pfn, filename, suffix, BT, query):
"ask blockchain server, calculate text, make image - and save it to disk"
try:
_, text = chaincountdown.doTheChaChaCha(BT, pfn)
except Exception as e:
self.send_error(self.INTERNAL_SERVER_ERROR, "Querying the blockchain server failed (%s)" % concatArgs(e))
return False
try:
o = helpers.replacedInDict(IMAGEDEFAULTS, query)
o["fontsizefooter"] = max(FONTSIZEFOOTER_MIN, int(o["fontsize"]) / 2)
imaging.textToImage(filename, text=text, **o)
except Exception as e:
self.send_error(
self.BAD_REQUEST, "Creating the image did not work (%s) " % concatArgs(e.args) + self.suggest()
)
return False
return True
def textToImage(filename, text, **options):
"""Says what it does.
One long subroutine only because it is a simply a serial process.
N.B. filetype polymorphism depending on suffix of filename"""
# defaults are overwritten by user choices
o = replacedInDict(IMAGEDEFAULTS, options)
correctTheTypes(o) # type string to whatever needed here.
# get the fontface:
fontfilename = findMatchingFont( o["font"], FONTS)
fontface=os.path.join(FONTDIR, fontfilename)
# allow empty heading
if o["heading"]!="":
fontHeading = ImageFont.truetype(fontface, o["headingfontsize"])
headingLength=fontHeading.getsize(o["heading"])[0]
else:
headingLength=0
o["headingfontsize"]=0
# footer font & length:
#print o["footerfontsize"]
o["footerfontsize"] = minFooter(o["footerfontsize"], fontfilename)
#print o["footerfontsize"]
fontFooter = ImageFont.truetype(fontface,o["footerfontsize"])
footerLength = fontFooter.getsize(o["footer"])[0]
# prepare text
text = cutUpText(text, o["maxcharsperline"])
lines = text.rstrip().split("\n")
# font -> line lengths -> pixel width & height
font = ImageFont.truetype(fontface, o["fontsize"])
lineDistance = int ( o["fontsize"] * o["linedistanceratio"] )
lineDistanceHeading = int ( o["headingfontsize"] * o["linedistanceratio"] )
border = lineDistance
lineWidths = [font.getsize(line)[0] for line in lines]
width=max(max(lineWidths), headingLength, footerLength) + 2 * border
# this reflects the line structure of the image:
height = border
height += (o["headingfontsize"] + lineDistanceHeading) if o["heading"]!="" else 0
height += (o["fontsize"] + lineDistance) * len(lines)
height += int(0.5 * o["footerfontsize"]) + o["footerfontsize"] + border
# PIL stuff
img = Image.new("RGBA", (width, height), o["bgcolor"])
draw = ImageDraw.Draw(img)
startPos=lineDistance
# heading:
if o["heading"]!="":
draw.text(((width-headingLength)/2, startPos),o["heading"],o["color"],font=fontHeading)
startPos += o["headingfontsize"] + lineDistanceHeading
# main text:
for i, line in enumerate(lines):
draw.text(((width-lineWidths[i])/2, startPos),line,o["color"],font=font)
startPos += o["fontsize"] + lineDistance
# footer:
startPos += int(0.5 * o["footerfontsize"])
draw.text((width-footerLength-border, startPos),o["footer"],o["color"],font=fontFooter)
# PIL stuff
draw = ImageDraw.Draw(img)
draw = ImageDraw.Draw(img)
# save to file
if filename.endswith("jpg"):
img.save(filename, quality=o["jpgquality"])
else:
img.save(filename)