progress coding function to create an export string

fcore/quad-tree.sml

@@ -1,5 +1,7 @@
-structure BinTree =
+structure CollisionTree =
 struct
+  structure BinTree =
+  struct
     datatype 'a bintree =
       NODE of
         { x: int
@@ -95,10 +97,8 @@ struct
 
     fun toList tree =
       foldr (fn (item, acc) => item :: acc, tree, [])
-end
+  end
 
-structure CollisionTree =
-struct
   fun shouldIgnoreData {a, r = _, g = _, b = _} = a = 0
 
   local
@@ -457,33 +457,6 @@ struct
       toBintree tree
     end
 
-  fun toTrianglesMerged
-    ( windowWidth
-    , windowHeight
-    , squares
-    , size
-    , canvasWidth
-    , canvasHeight
-    , xClickPoints
-    , yClickPoints
-    ) =
-    let
-      val qtree = buildTree (0, 0, size, squares)
-      val bintree = merge (qtree, squares)
-
-      val f = folder
-        ( windowWidth
-        , windowHeight
-        , canvasWidth
-        , canvasHeight
-        , xClickPoints
-        , yClickPoints
-        )
-      val vec = BinTree.foldr (f, bintree, [])
-    in
-      Vector.concat vec
-    end
-
   fun toStringFolder ({x, ex, y, ey, data = {r, g, b, a}}, acc) =
     let
       val item = String.concat
@@ -524,4 +497,77 @@ struct
     in
       String.concat acc
     end
+
+  fun intToRealString num =
+    let
+      val result = Real32.fromInt num
+      val result = Real32.toString result
+    in
+      if String.isSubstring "." result then result else result ^ ".0"
+    end
+
+  fun colToRealString col =
+    let
+      val result = Real32.fromInt col / 255.0
+      val result = Real32.toString result
+    in
+      if String.isSubstring "." result then result else result ^ ".0"
+    end
+
+  fun toExportStringFolder ({x, ex, y, ey, data = {r, g, b, a}}, acc) =
+    let
+      val x = intToRealString x
+      val y = intToRealString y
+      val ex = intToRealString ex
+      val ey = intToRealString ey
+      val r = colToRealString r
+      val g = colToRealString g
+      val b = colToRealString b
+
+      val x = String.concat ["((", x, " - halfWidth) / halfWidth)"]
+      val y = String.concat ["(~(", y, " - halfHeight) / halfHeight)"]
+
+      val ex = String.concat
+        [ "((((("
+        , ex
+        , " - "
+        , x
+        , ") "
+        , "* scale) + "
+        , x
+        , ") - halfWidth) / halfWidth)"
+        ]
+
+      val ey = String.concat
+        [ "("
+        , "("
+        , "("
+        , "("
+        , "("
+        , ey
+        , " - "
+        , y
+        , ")"
+        , "* scale) + "
+        , y
+        , ") - halfHeight) / halfHeight)"
+        ]
+    in
+      x :: y :: ex :: ex :: y :: ey :: r :: g :: b :: acc
+    end
+
+  fun toExportString (squares, canvasWidth, canvasHeight) =
+    let
+      val size = Int.max (canvasWidth, canvasHeight)
+      val qtree = buildTree (0, 0, size, squares)
+      val bintree = merge (qtree, squares)
+
+      val coords = BinTree.foldr (toExportStringFolder, bintree, [])
+      val coords = String.concatWith "," coords
+
+      val header = ""
+      val footer = ""
+    in
+      String.concat [header, coords, footer]
+    end
 end