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from PIL import Image
from latLng import latLng
class layer:
"""template for a GPS image layer"""
tl=latLng()
br=latLng()
pixel=(0,0)
def __init__(self,file,ll1,ll2):
try:
self.image=Image.open(file)
except:
print "gps layer: failed to open", file
try:
self.tl.parse(ll1)
self.br.parse(ll2)
self.pixsize=latLng(abs(self.tl.lat-self.br.lat)/self.image.size[1],abs(self.tl.lng-self.br.lng)/self.image.size[0])
except:
print "gps layer: failed to parse", file
def checkcoord(self,pos):
p=self.findpixel(pos)
if p!=self.pixel:
self.pixel=p
return self.setcoord(p)
else:
return None
def findpixel(self,pos):
return (int((pos.lng-self.tl.lng)/self.pixsize.lng),int((pos.lat-self.br.lat)/self.pixsize.lat))
def setcoord(self,pos):
"""to be overwritten:
gets a messages when values change"
returns None otherwise"""
return None
class trigger():
"""a generic trigger -
id can be anything -
i.e. a string or an integer"""
def __init__(self,id,command,param):
self.id=id
self.command=(command,param)
def check(self,id):
if id==self.id:
return command
else:
return None
class indexlayer(layer):
"""generates gps triggers from an index colour image
triggers when colour changes"""
triggers=[]
colour=-1
def setcoord(self,pos):
result=None
#210 35 5 185
c=self.image.getpixel(pos)
if c!=self.colour:
self.colour=c
print "indexlayer: new colour",c
for t in self.triggers:
if c==t.id:
result=t.command
return result
class scalelayer(layer):
"""generates a varying signal based on interpolating a greyscale image
uses sub pixel position"""
def findpixel(self,pos):
#float version
return ((pos.lng-self.tl.lng)/self.pixsize.lng,(pos.lat-self.br.lat)/self.pixsize.lat)
def setcommand(self,command):
self.command=command
def setcoord(self,pos):
px=int(pos[0])
py=int(pos[1])
c=float(self.image.getpixel((px,py)))/255.0
c1=float(self.image.getpixel((px+1,py)))/255.0
c2=float(self.image.getpixel((px,py+1)))/255.0
c3=float(self.image.getpixel((px+1,py+1)))/255.0
xf=pos[0]-px
yf=pos[1]-py
#lerp sub-pixel value
return (self.command,(((c*(1.0-xf))+(c1*xf))*(1.0-yf))+(((c2*(1.0-xf))+(c3*xf))*yf))
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