Moved topics/functions.py to mobject/, and moved topics/graph_scene.py to scene

mobject/functions.py

@@ -0,0 +1,64 @@
+from __future__ import absolute_import
+
+from constants import *
+
+from mobject.types.vectorized_mobject import VMobject
+from utils.config_ops import digest_config
+
+
+class ParametricFunction(VMobject):
+    CONFIG = {
+        "t_min" : 0,
+        "t_max" : 1,
+        "num_anchor_points" : 100,
+    }
+    def __init__(self, function, **kwargs):
+        self.function = function
+        VMobject.__init__(self, **kwargs)
+
+    def generate_points(self):
+        n_points = 3*self.num_anchor_points - 2
+        self.points = np.zeros((n_points, self.dim))
+        self.points[:,0] = np.linspace(
+            self.t_min, self.t_max, n_points
+        )
+        #VMobject.apply_function takes care of preserving
+        #desirable tangent line properties at anchor points
+        self.apply_function(lambda p : self.function(p[0]))
+
+class FunctionGraph(ParametricFunction):
+    CONFIG = {
+        "color" : YELLOW,
+        "x_min" : -FRAME_X_RADIUS,
+        "x_max" : FRAME_X_RADIUS,
+    }
+    def __init__(self, function, **kwargs):
+        digest_config(self, kwargs)
+        parametric_function = lambda t : t*RIGHT + function(t)*UP
+        ParametricFunction.__init__(
+            self, 
+            parametric_function,
+            t_min = self.x_min, 
+            t_max = self.x_max,
+            **kwargs
+        )
+        self.function = function
+
+    def get_function(self):
+        return self.function
+
+
+
+
+        
+
+
+
+
+
+
+
+
+
+
+