DIAG: Allow drawing the square the user path points to

Graphics/Diagram/Gtk.hs

@@ -19,8 +19,8 @@ diag p obj@(Object _)
       mkDiag (mconcat [convexHPText, convexHP, convexHLs, coordPoints, plotterBG])
              p obj
   | alg p == 4 =
-      mkDiag (mconcat [squares, coordPointsText, coordPoints, polyLines,
-                       plotterBG])
+      mkDiag (mconcat [quadPathSquare, squares, coordPointsText,
+                       coordPoints, polyLines, plotterBG])
              p obj
   | otherwise = mempty
 diag p objs@(Objects _)

Graphics/Diagram/Plotter.hs

@@ -6,11 +6,13 @@ import Algebra.VectorTypes
 import Algorithms.ConvexHull.GrahamScan
 import Algorithms.RangeSearch.Core
 import Algorithms.PolygonIntersection.Core
+import Data.Maybe
 import Data.Monoid
 import Diagrams.Backend.Cairo
 import Diagrams.Prelude hiding ((<>))
 import Graphics.Diagram.Types
 import Graphics.Gloss.Data.Extent
+import Parser.PathParser
 
 
 -- |Creates a Diagram that shows the coordinates from the points
@@ -188,6 +190,30 @@ squares = Diag f
     f _ _ = mempty
 
 
+-- |Create a diagram that shows a single square of the RangeSearch algorithm
+-- from the quad tree in red, according to the given path in pQt.
+quadPathSquare :: Diag
+quadPathSquare = Diag f
+  where
+    f p (Object []) = mempty
+    f p (Object vt) =
+      (\((xmin, xmax), (ymin, ymax)) -> rect (xmax - xmin) (ymax - ymin)
+        # moveTo (p2 ((xmax + xmin) / 2,(ymax + ymin) / 2)) # lw thin # lc red)
+        (getSquare (stringToQuads (pQt p)) (qt, []))
+      where
+        quads :: [QuadOrOrient]
+        quads = stringToQuads (pQt p)
+        getSquare :: [QuadOrOrient] -> Zipper PT -> Square
+        getSquare [] z = getSquareByZipper (dX p, dY p) z
+        getSquare (q:qs) z = case q of
+          Orient x -> getSquare qs (fromMaybe z (findNeighbor x z))
+          Quad x -> getSquare qs (fromMaybe z (goQuad x z))
+        qt :: QuadTree PT
+        qt = quadTree vtf (dX p, dY p)
+        vtf :: [PT]
+        vtf = filterValidPT p vt
+
+
 -- |Creates a Diagram that shows an XAxis which is bound
 -- by the dimensions given in xD from DiagProp.
 xAxis :: Diag

Graphics/Diagram/Types.hs

@@ -53,7 +53,9 @@ data DiagProp = MkProp {
   -- |If we want to show the coordinates as text.
   ct :: Bool,
   -- |Square size used to show the grid and x/y-axis.
-  sqS :: Double
+  sqS :: Double,
+  -- |The path to a quad in the quad tree.
+  pQt :: String
 }
 
 
@@ -83,7 +85,7 @@ instance Monoid Diag where
 
 -- |The default properties of the Diagram.
 defaultProp :: DiagProp
-defaultProp = MkProp 2 (0,500) (0,500) 0 False False 50
+defaultProp = MkProp 2 (0,500) (0,500) 0 False False 50 ""
 
 
 -- |Extract the lower bound of the x-axis dimension.