1 files changed, 48 insertions, 0 deletions
diff --git a/layers.py b/layers.py
new file mode 100644
index 0000000..38aeba4
--- /dev/null
+++ b/layers.py
@@ -0,0 +1,48 @@
+from PIL import Image
+from latLng import latLng
+
+class layer:
+	"""a generic GPS image layer"""
+	tl=latLng()
+	br=latLng()
+	pixel=latLng()
+	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 findpixel(self,pos):
+		return latLng(int((pos.lng-self.tl.lng)/self.pixsize.lng),int((pos.lat-self.br.lat)/self.pixsize.lat))
+	def checkcoord(self,pos):
+		p=self.findpixel(pos)
+		if p!=self.pixel:
+			self.pixel=p
+			return self.setcoord(p)
+		else:
+			return None
+	def setcoord(self,pos):
+		return str(1.0)
+		
+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):
+	triggers=[]
+	def setcoord(self,pos):
+		return str(1)
+\ No newline at end of file