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now both integral bounds can move

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This commit is contained in:
Ben Hambrecht 2018-04-19 23:02:52 +02:00
parent bd1c312f3b
commit 83bebfb109
1 changed files with 43 additions and 22 deletions
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65
scene/graph_scene.py
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@ -57,6 +57,11 @@ class GraphScene(Scene):
def setup(self):
self.default_graph_colors_cycle = it.cycle(self.default_graph_colors)
self.left_T_label = VGroup()
self.left_v_line = VGroup()
self.right_T_label = VGroup()
self.right_v_line = VGroup()
def setup_axes(self, animate=False):
# TODO, once eoc is done, refactor this to be less redundant.
x_num_range = float(self.x_max - self.x_min)
@ -291,7 +296,7 @@ class GraphScene(Scene):
def get_area(self, graph, t_min, t_max):
numerator = max(t_max - t_min, 0.01)
numerator = max(t_max - t_min, 0.0001)
dx = float(numerator) / self.num_rects
return self.get_riemann_rectangles(
graph,
@ -439,13 +444,17 @@ class GraphScene(Scene):
return group
def add_T_label(self, x_val, color = WHITE, animated = False, **kwargs):
def add_T_label(self, x_val, side = RIGHT, label = None, color = WHITE, animated = False, **kwargs):
triangle = RegularPolygon(n=3, start_angle = np.pi/2)
triangle.scale_to_fit_height(MED_SMALL_BUFF)
triangle.move_to(self.coords_to_point(x_val, 0), UP)
triangle.set_fill(color, 1)
triangle.set_stroke(width = 0)
T_label = TexMobject(self.variable_point_label, fill_color = color)
if label == None:
T_label = TexMobject(self.variable_point_label, fill_color = color)
else:
T_label = TexMobject(label, fill_color = color)
T_label.next_to(triangle, DOWN)
v_line = self.get_vertical_line_to_graph(
x_val, self.v_graph,
@ -462,8 +471,13 @@ class GraphScene(Scene):
else:
self.add(triangle, v_line, T_label)
self.T_label_group = VGroup(T_label, triangle)
self.right_v_line = v_line
if np.all(side == LEFT):
self.left_T_label_group = VGroup(T_label, triangle)
self.left_v_line = v_line
elif np.all(side == RIGHT):
self.right_T_label_group = VGroup(T_label, triangle)
self.right_v_line = v_line
@ -472,6 +486,7 @@ class GraphScene(Scene):
graph,
new_t_min,
new_t_max,
fade_close_to_origin = True,
run_time = 1.0
):
curr_t_min = self.x_axis.point_to_number(self.area.get_left())
@ -482,33 +497,39 @@ class GraphScene(Scene):
new_t_max = curr_t_max
group = VGroup(self.area)
if hasattr(self, "right_v_line"):
group.add(self.right_v_line)
else:
group.add(VGroup())
# because update_group expects 3 elements in group
if hasattr(self, "T_label_group"):
group.add(self.T_label_group)
else:
group.add(VGroup())
group.add(self.left_v_line)
group.add(self.left_T_label_group)
group.add(self.right_v_line)
group.add(self.right_T_label_group)
def update_group(group, alpha):
area, v_line, T_label = group
area, left_v_line, left_T_label, right_v_line, right_T_label = group
t_min = interpolate(curr_t_min, new_t_min, alpha)
t_max = interpolate(curr_t_max, new_t_max, alpha)
new_area = self.get_area(graph,t_min, t_max)
new_v_line = self.get_vertical_line_to_graph(
new_left_v_line = self.get_vertical_line_to_graph(
t_min, graph
)
new_left_v_line.set_color(left_v_line.get_color())
left_T_label.move_to(new_left_v_line.get_bottom(), UP)
new_right_v_line = self.get_vertical_line_to_graph(
t_max, graph
)
new_v_line.set_color(v_line.get_color())
T_label.move_to(new_v_line.get_bottom(), UP)
new_right_v_line.set_color(right_v_line.get_color())
right_T_label.move_to(new_right_v_line.get_bottom(), UP)
#Fade close to 0
if len(T_label) > 0:
T_label[0].set_fill(opacity = min(1, t_max))
# Fade close to 0
if fade_close_to_origin:
if len(left_T_label) > 0:
left_T_label[0].set_fill(opacity = min(1, np.abs(t_min)))
if len(right_T_label) > 0:
right_T_label[0].set_fill(opacity = min(1, np.abs(t_max)))
Transform(area, new_area).update(1)
Transform(v_line, new_v_line).update(1)
Transform(left_v_line, new_left_v_line).update(1)
Transform(right_v_line, new_right_v_line).update(1)
return group
return UpdateFromAlphaFunc(group, update_group, run_time = run_time)