working on new drawing layer

draw.py

@@ -0,0 +1,74 @@
+import math
+
+class Point:
+    def __init__(self, x, y):
+        self.x = x
+        self.y = y
+
+    def __add__(self, other):
+        return Point(self.x + other.x, self.y + other.y)
+
+    def __sub__(self, other):
+        return Point(self.x - other.x, self.y - other.y)
+
+    def __eq__(self, other):
+        return self.x == other.x and self.y == other.y
+
+    def __lt__(self, other):
+        return (self.x**2 + self.y**2) < (other.x**2 + other.y**2)
+
+    def __gt__(self, other):
+        return (self.x**2 + self.y**2) > (other.x**2 + other.y**2)
+
+    def scale(self, s):
+        return Point(self.x * s, self.y * s)
+
+class Scene:
+    def __init__(self, bounds):
+        self.objects = list()
+        self.bounds = bounds
+
+    def add(self, obj):
+        if type(obj).__name__ == "HLine": # set HLine to width of scene
+            obj.bounds = Rectangle(Point(0, obj.h), Point(self.bounds.max_x, obj.h))
+        if type(obj).__name__ == "VLine":
+            obj.bounds = Rectangle(Point(obj.w, 0), Point(obj.w, self.bounds.max_y))
+        if not obj.contained_in(self.bounds):
+            raise ValueError("Object " + obj + " is outside the scene")
+        self.objects.append(obj)
+
+    def render(self):
+        for obj in self.objects:
+            obj.render()
+
+class Rectangle:
+    def __init__(self, origin, extent):
+        self.origin = origin
+        self.extent = extent
+        if origin > extent:
+            raise ValueError("Origin is greater than far corner!")
+        self.bounds = Rectangle(origin, extent)
+        self.min_x = origin.x
+        self.max_x = extent.x
+        self.min_y = origin.y
+        self.max_y = extent.y
+
+    def contained_in(self, rect):
+        if self.origin.x < rect.origin.x or self.extent.x > rect.extent.x:
+            return False
+        if self.origin.y < rect.origin.y or self.extent.y > rect.extent.y:
+            rerturn False
+        return True 
+
+    def render(self):
+        box(self.origin, self.extent)
+
+class HLine:
+    def __init__(self, h, width=None):
+        self.h = h
+
+#
+# Drawing primitives
+#
+
+