Source code for manim.camera.mapping_camera

"""A camera that allows mapping between objects."""

__all__ = ["MappingCamera", "OldMultiCamera", "SplitScreenCamera"]

import math

import numpy as np

from ..camera.camera import Camera
from ..mobject.types.vectorized_mobject import VMobject
from ..utils.config_ops import DictAsObject

# TODO: Add an attribute to mobjects under which they can specify that they should just
# map their centers but remain otherwise undistorted (useful for labels, etc.)


[docs]class MappingCamera(Camera): """Camera object that allows mapping between objects. """ def __init__( self, mapping_func=lambda p: p, min_num_curves=50, allow_object_intrusion=False, **kwargs ): self.mapping_func = mapping_func self.min_num_curves = min_num_curves self.allow_object_intrusion = allow_object_intrusion super().__init__(**kwargs) def points_to_pixel_coords(self, mobject, points): return super().points_to_pixel_coords( mobject, np.apply_along_axis(self.mapping_func, 1, points), )
[docs] def capture_mobjects(self, mobjects, **kwargs): mobjects = self.get_mobjects_to_display(mobjects, **kwargs) if self.allow_object_intrusion: mobject_copies = mobjects else: mobject_copies = [mobject.copy() for mobject in mobjects] for mobject in mobject_copies: if ( isinstance(mobject, VMobject) and 0 < mobject.get_num_curves() < self.min_num_curves ): mobject.insert_n_curves(self.min_num_curves) super().capture_mobjects( mobject_copies, include_submobjects=False, excluded_mobjects=None, )
# Note: This allows layering of multiple cameras onto the same portion of the pixel array, # the later cameras overwriting the former # # TODO: Add optional separator borders between cameras (or perhaps peel this off into a # CameraPlusOverlay class) # TODO, the classes below should likely be deleted
[docs]class OldMultiCamera(Camera): def __init__(self, *cameras_with_start_positions, **kwargs): self.shifted_cameras = [ DictAsObject( { "camera": camera_with_start_positions[0], "start_x": camera_with_start_positions[1][1], "start_y": camera_with_start_positions[1][0], "end_x": camera_with_start_positions[1][1] + camera_with_start_positions[0].pixel_width, "end_y": camera_with_start_positions[1][0] + camera_with_start_positions[0].pixel_height, }, ) for camera_with_start_positions in cameras_with_start_positions ] super().__init__(**kwargs)
[docs] def capture_mobjects(self, mobjects, **kwargs): for shifted_camera in self.shifted_cameras: shifted_camera.camera.capture_mobjects(mobjects, **kwargs) self.pixel_array[ shifted_camera.start_y : shifted_camera.end_y, shifted_camera.start_x : shifted_camera.end_x, ] = shifted_camera.camera.pixel_array
[docs] def set_background(self, pixel_array, **kwargs): for shifted_camera in self.shifted_cameras: shifted_camera.camera.set_background( pixel_array[ shifted_camera.start_y : shifted_camera.end_y, shifted_camera.start_x : shifted_camera.end_x, ], **kwargs, )
[docs] def set_pixel_array(self, pixel_array, **kwargs): super().set_pixel_array(pixel_array, **kwargs) for shifted_camera in self.shifted_cameras: shifted_camera.camera.set_pixel_array( pixel_array[ shifted_camera.start_y : shifted_camera.end_y, shifted_camera.start_x : shifted_camera.end_x, ], **kwargs, )
[docs] def init_background(self): super().init_background() for shifted_camera in self.shifted_cameras: shifted_camera.camera.init_background()
# A OldMultiCamera which, when called with two full-size cameras, initializes itself # as a split screen, also taking care to resize each individual camera within it
[docs]class SplitScreenCamera(OldMultiCamera): def __init__(self, left_camera, right_camera, **kwargs): Camera.__init__(self, **kwargs) # to set attributes such as pixel_width self.left_camera = left_camera self.right_camera = right_camera half_width = math.ceil(self.pixel_width / 2) for camera in [self.left_camera, self.right_camera]: camera.reset_pixel_shape(camera.pixel_height, half_width) super().__init__( (left_camera, (0, 0)), (right_camera, (0, half_width)), )