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358 lines
11 KiB
Python
358 lines
11 KiB
Python
import re
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from .mobject import Mobject
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from helpers import *
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class VMobject(Mobject):
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CONFIG = {
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"fill_color" : None,
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"fill_opacity" : 0.0,
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"stroke_color" : None,
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#Indicates that it will not be displayed, but
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#that it should count in parent mobject's path
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"is_subpath" : False,
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"close_new_points" : False,
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"mark_paths_closed" : False,
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"propogate_style_to_family" : False,
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}
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def __init__(self, *args, **kwargs):
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Mobject.__init__(self, *args, **kwargs)
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VMobject.init_colors(self)
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## Colors
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def init_colors(self):
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self.set_style_data(
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stroke_color = self.stroke_color or self.color,
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stroke_width = self.stroke_width,
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fill_color = self.fill_color or self.color,
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fill_opacity = self.fill_opacity,
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family = self.propogate_style_to_family
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)
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return self
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def set_family_attr(self, attr, value):
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for mob in self.submobject_family():
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setattr(mob, attr, value)
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def set_style_data(self,
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stroke_color = None,
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stroke_width = None,
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fill_color = None,
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fill_opacity = None,
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family = True):
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if stroke_color is not None:
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setattr(self, "stroke_rgb", color_to_rgb(stroke_color))
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if stroke_width is not None:
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setattr(self, "stroke_width", stroke_width)
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if fill_color is not None:
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setattr(self, "fill_rgb", color_to_rgb(fill_color))
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if fill_opacity is not None:
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setattr(self, "fill_opacity", fill_opacity)
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if family:
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kwargs = locals()
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kwargs.pop("self")
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for mob in self.submobjects:
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mob.set_style_data(**kwargs)
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return self
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def set_fill(self, color = None, opacity = None, family = True):
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if self.fill_opacity == 0 and opacity is None:
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opacity = 1
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return self.set_style_data(
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fill_color = color,
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fill_opacity = opacity,
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family = family
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)
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def set_stroke(self, color = None, width = None, family = True):
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return self.set_style_data(
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stroke_color = color,
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stroke_width = width,
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family = family
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)
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def highlight(self, color, family = True):
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self.set_fill(
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color = color,
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opacity = self.get_fill_opacity(),
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family = family
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)
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self.set_stroke(color = color, family = family)
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return self
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# def fade(self, darkness = 0.5):
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# Mobject.fade(self, darkness)
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# return self
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def get_fill_color(self):
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try:
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self.fill_rgb = np.clip(self.fill_rgb, 0, 1)
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return Color(rgb = self.fill_rgb)
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except:
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return Color(WHITE)
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def get_fill_opacity(self):
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return self.fill_opacity
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def get_stroke_color(self):
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try:
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self.stroke_rgb = np.clip(self.stroke_rgb, 0, 1)
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return Color(rgb = self.stroke_rgb)
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except:
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return Color(WHITE)
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def get_color(self):
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if self.fill_opacity == 0:
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return self.get_stroke_color()
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return self.get_fill_color()
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## Drawing
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def start_at(self, point):
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if len(self.points) == 0:
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self.points = np.zeros((1, 3))
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self.points[0] = point
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return self
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def add_control_points(self, control_points):
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assert(len(control_points) % 3 == 0)
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self.points = np.append(
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self.points,
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control_points,
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axis = 0
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)
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return self
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def is_closed(self):
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return is_closed(self.points)
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def set_anchors_and_handles(self, anchors, handles1, handles2):
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assert(len(anchors) == len(handles1)+1)
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assert(len(anchors) == len(handles2)+1)
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total_len = 3*(len(anchors)-1) + 1
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self.points = np.zeros((total_len, self.dim))
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self.points[0] = anchors[0]
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arrays = [handles1, handles2, anchors[1:]]
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for index, array in enumerate(arrays):
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self.points[index+1::3] = array
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return self.points
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def set_points_as_corners(self, points):
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if len(points) <= 1:
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return self
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points = np.array(points)
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self.set_anchors_and_handles(points, *[
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interpolate(points[:-1], points[1:], alpha)
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for alpha in 1./3, 2./3
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])
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return self
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def set_points_smoothly(self, points):
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if len(points) <= 1:
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return self
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h1, h2 = get_smooth_handle_points(points)
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self.set_anchors_and_handles(points, h1, h2)
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return self
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def set_points(self, points):
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self.points = np.array(points)
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return self
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def set_anchor_points(self, points, mode = "smooth"):
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if not isinstance(points, np.ndarray):
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points = np.array(points)
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if self.close_new_points and not is_closed(points):
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points = np.append(points, [points[0]], axis = 0)
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if mode == "smooth":
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self.set_points_smoothly(points)
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elif mode == "corners":
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self.set_points_as_corners(points)
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else:
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raise Exception("Unknown mode")
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return self
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def change_anchor_mode(self, mode):
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anchors, h1, h2 = self.get_anchors_and_handles()
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self.set_anchor_points(anchors, mode = mode)
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return self
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def make_smooth(self):
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return self.change_anchor_mode("smooth")
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def make_jagged(self):
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return self.change_anchor_mode("corners")
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def add_subpath(self, points):
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"""
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A VMobject is meant to represnt
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a single "path", in the svg sense of the word.
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However, one such path may really consit of separate
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continuous components if there is a move_to command.
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These other portions of the path will be treated as submobjects,
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but will be tracked in a separate special list for when
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it comes time to display.
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"""
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subpath_mobject = self.copy()#TODO, better way?
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subpath_mobject.is_subpath = True
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subpath_mobject.set_points(points)
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self.add(subpath_mobject)
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return subpath_mobject
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def get_subpath_mobjects(self):
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return filter(
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lambda m : m.is_subpath,
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self.submobjects
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)
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## Information about line
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def component_curves(self):
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for n in range(self.get_num_anchor_points()-1):
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yield self.get_nth_curve(n)
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def get_nth_curve(self, n):
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return bezier(self.points[3*n:3*n+4])
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def get_num_anchor_points(self):
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return (len(self.points) - 1)/3 + 1
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def point_from_proportion(self, alpha):
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num_cubics = self.get_num_anchor_points()-1
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interpoint_alpha = num_cubics*(alpha % (1./num_cubics))
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index = 3*int(alpha*num_cubics)
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cubic = bezier(self.points[index:index+4])
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return cubic(interpoint_alpha)
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def get_anchors_and_handles(self):
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return [
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self.points[i::3]
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for i in range(3)
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]
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## Alignment
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def align_points(self, mobject):
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Mobject.align_points(self, mobject)
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is_subpath = self.is_subpath or mobject.is_subpath
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self.is_subpath = mobject.is_subpath = is_subpath
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mark_closed = self.mark_paths_closed and mobject.mark_paths_closed
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self.mark_paths_closed = mobject.mark_paths_closed = mark_closed
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return self
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def align_points_with_larger(self, larger_mobject):
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assert(isinstance(larger_mobject, VMobject))
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self.insert_n_anchor_points(
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larger_mobject.get_num_anchor_points()-\
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self.get_num_anchor_points()
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)
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return self
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def insert_n_anchor_points(self, n):
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curr = self.get_num_anchor_points()
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if curr == 0:
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self.points = np.zeros((1, 3))
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n = n-1
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if curr == 1:
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self.points = np.repeat(self.points, 3*n+1, axis = 0)
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return self
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points = np.array([self.points[0]])
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num_curves = curr-1
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#Curves in self are buckets, and we need to know
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#how many new anchor points to put into each one.
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#Each element of index_allocation is like a bucket,
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#and its value tells you the appropriate index of
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#the smaller curve.
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index_allocation = (np.arange(curr+n-1) * num_curves)/(curr+n-1)
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for index in range(num_curves):
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curr_bezier_points = self.points[3*index:3*index+4]
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num_inter_curves = sum(index_allocation == index)
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alphas = np.arange(0, num_inter_curves+1)/float(num_inter_curves)
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for a, b in zip(alphas, alphas[1:]):
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new_points = partial_bezier_points(
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curr_bezier_points, a, b
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)
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points = np.append(
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points, new_points[1:], axis = 0
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)
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self.set_points(points)
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return self
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def get_point_mobject(self, center = None):
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if center is None:
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center = self.get_center()
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return VectorizedPoint(center)
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def repeat_submobject(self, submobject):
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if submobject.is_subpath:
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return VectorizedPoint(submobject.points[0])
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return submobject.copy()
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def interpolate_color(self, mobject1, mobject2, alpha):
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attrs = [
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"stroke_rgb",
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"stroke_width",
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"fill_rgb",
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"fill_opacity",
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]
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for attr in attrs:
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setattr(self, attr, interpolate(
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getattr(mobject1, attr),
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getattr(mobject2, attr),
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alpha
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))
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if alpha == 1.0:
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# print getattr(mobject2, attr)
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setattr(self, attr, getattr(mobject2, attr))
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def pointwise_become_partial(self, mobject, a, b):
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assert(isinstance(mobject, VMobject))
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#Partial curve includes three portions:
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#-A middle section, which matches the curve exactly
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#-A start, which is some ending portion of an inner cubic
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#-An end, which is the starting portion of a later inner cubic
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if a <= 0 and b >= 1:
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self.set_points(mobject.points)
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self.mark_paths_closed = mobject.mark_paths_closed
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return self
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self.mark_paths_closed = False
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num_cubics = mobject.get_num_anchor_points()-1
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lower_index = int(a*num_cubics)
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upper_index = int(b*num_cubics)
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points = np.array(
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mobject.points[3*lower_index:3*upper_index+4]
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)
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if len(points) > 1:
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a_residue = (num_cubics*a)%1
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b_residue = (num_cubics*b)%1
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points[:4] = partial_bezier_points(
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points[:4], a_residue, 1
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)
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points[-4:] = partial_bezier_points(
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points[-4:], 0, b_residue
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)
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self.set_points(points)
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return self
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class VectorizedPoint(VMobject):
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CONFIG = {
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"color" : BLACK,
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"artificial_width" : 0.01,
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"artificial_height" : 0.01,
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}
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def __init__(self, location = ORIGIN, **kwargs):
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VMobject.__init__(self, **kwargs)
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self.set_points(np.array([location]))
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def get_width(self):
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return self.artificial_width
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def get_height(self):
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return self.artificial_height
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