# HG changeset patch
# User Laman
# Date 2017-04-08 15:46:56
# Node ID 5bf35728ab2bd78f62bc6fce7934be854325b933
# Parent  4c1ba49ea8592d73f26d91a053a6d921555e9c19

imgView fix: grid stays on its place on resize. refactored Corners a little

diff --git a/src/corners.py b/src/corners.py
--- a/src/corners.py
+++ b/src/corners.py
@@ -26,19 +26,6 @@ class Corners:
 
 		self.corners[index]=a
 
-
-	## Computes twice the area of the triangle formed by points a,b,c.
-	#
-	#  @return positive value for points oriented counter-clockwise, negative for clockwise, zero for degenerate cases.
-	def _doubleTriangleArea(a,b,c):
-		return (a.x-b.x)*(c.y-a.y)-(c.x-a.x)*(a.y-b.y)
-
-
-	def _slope(a,b):
-		if(b.x==a.x): return float("inf")
-		return (b.y-a.y)/(b.x-a.x)
-
-
 	## Order the corners (0,1,2,3) so they make a quadrangle with vertices KLMN in counter-clockwise order, K being in the upper left.
 	#
 	#  For four points ABCD, there are 24 possible permutations corresponding to the desired KLMN.
@@ -64,10 +51,10 @@ class Corners:
 		if len(self.corners)!=4: return False # erroneus call
 
 		a,b,c,d=self.corners
-		abc=Corners._doubleTriangleArea(a,b,c)
-		abd=Corners._doubleTriangleArea(a,b,d)
-		acd=Corners._doubleTriangleArea(a,c,d)
-		bcd=Corners._doubleTriangleArea(b,c,d)
+		abc=doubleTriangleArea(a,b,c)
+		abd=doubleTriangleArea(a,b,d)
+		acd=doubleTriangleArea(a,c,d)
+		bcd=doubleTriangleArea(b,c,d)
 
 		if any(x==0 for x in (abc,abd,acd,bcd)): return False # collinear degenerate
 
@@ -83,7 +70,7 @@ class Corners:
 
 		for i,corner in enumerate(self.corners): # find the NK edge: going right-left with the lowest slope, secondarily the one going down
 			ii=(i+1)%4
-			slope=abs(Corners._slope(corner,self.corners[ii]))
+			slope=abs(getSlope(corner,self.corners[ii]))
 			if corner.x>self.corners[ii].x and (slope<lowestSlope or (slope==lowestSlope and corner.y<self.corners[ii].y)):
 				kIndex=ii
 				lowestSlope=slope
@@ -91,3 +78,18 @@ class Corners:
 		self.corners=self.corners[kIndex:]+self.corners[:kIndex] # rotate the upper left corner to the first place
 
 		return True # success
+
+	def scale(self,scale):
+		self.corners=[c*scale for c in self.corners]
+
+
+## Computes twice the area of the triangle formed by points a,b,c.
+#
+#  @return positive value for points oriented counter-clockwise, negative for clockwise, zero for degenerate cases.
+def doubleTriangleArea(a,b,c):
+	return (a.x-b.x)*(c.y-a.y)-(c.x-a.x)*(a.y-b.y)
+
+
+def getSlope(a,b):
+	if(b.x==a.x): return float("inf")
+	return (b.y-a.y)/(b.x-a.x)
diff --git a/src/gui/imgview.py b/src/gui/imgview.py
--- a/src/gui/imgview.py
+++ b/src/gui/imgview.py
@@ -83,5 +83,8 @@ class ImgView(ResizableCanvas):
 		self.create_line(x-3,y+3,x+4,y-4,fill="#00ff00")
 
 	def _onResize(self,event):
+		w=self._width
 		super()._onResize(event)
+		self._corners.scale(self._width/w)
+		self._boardGrid=Grid(self._corners.corners)
 		self.redraw()