常量部分 constants

manimlib 文件夹中的 constants.py 定义了在运行manim时需要的常量。 一些常量在这里没有说明，因为他们只在manim内部使用

画面和帧形状

ASPECT_RATIO = 16.0 / 9.0
FRAME_HEIGHT = 8.0
FRAME_WIDTH = FRAME_HEIGHT * ASPECT_RATIO
FRAME_Y_RADIUS = FRAME_HEIGHT / 2
FRAME_X_RADIUS = FRAME_WIDTH / 2

DEFAULT_PIXEL_HEIGHT = 1080
DEFAULT_PIXEL_WIDTH = 1920
DEFAULT_FRAME_RATE = 30

间距

SMALL_BUFF = 0.1
MED_SMALL_BUFF = 0.25
MED_LARGE_BUFF = 0.5
LARGE_BUFF = 1

DEFAULT_MOBJECT_TO_EDGE_BUFFER = MED_LARGE_BUFF    # Distance between object and edge
DEFAULT_MOBJECT_TO_MOBJECT_BUFFER = MED_SMALL_BUFF # Distance between objects

动画默认运行时间

DEFAULT_POINTWISE_FUNCTION_RUN_TIME = 3.0
DEFAULT_WAIT_TIME = 1.0

坐标

manim 使用三维坐标，并且用 ndarray 的类型

ORIGIN = np.array((0., 0., 0.))
UP = np.array((0., 1., 0.))
DOWN = np.array((0., -1., 0.))
RIGHT = np.array((1., 0., 0.))
LEFT = np.array((-1., 0., 0.))
IN = np.array((0., 0., -1.))
OUT = np.array((0., 0., 1.))
X_AXIS = np.array((1., 0., 0.))
Y_AXIS = np.array((0., 1., 0.))
Z_AXIS = np.array((0., 0., 1.))

# Useful abbreviations for diagonals
UL = UP + LEFT
UR = UP + RIGHT
DL = DOWN + LEFT
DR = DOWN + RIGHT

TOP = FRAME_Y_RADIUS * UP
BOTTOM = FRAME_Y_RADIUS * DOWN
LEFT_SIDE = FRAME_X_RADIUS * LEFT
RIGHT_SIDE = FRAME_X_RADIUS * RIGHT

数学常数

PI = np.pi
TAU = 2 * PI
DEGREES = TAU / 360
RADIANS = 1  # 以弧度制作为单位

针对 OpenGL

JOINT_TYPE_MAP = {
    "auto": 0,
    "round": 1,
    "bevel": 2,
    "miter": 3,
}

针对 Text

NORMAL = "NORMAL"
ITALIC = "ITALIC"
OBLIQUE = "OBLIQUE"
BOLD = "BOLD"

线条宽度

DEFAULT_STROKE_WIDTH = 4

颜色

颜色相关工具和预览可以使用：颜色工具 - MK官网

这里是manim中定义的颜色的预览：(修改自 elteoremadebeethoven)

BLUE

BLUE_E

BLUE_D

BLUE_C

BLUE_B

BLUE_A

TEAL

TEAL_E

TEAL_D

TEAL_C

TEAL_B

TEAL_A

GREEN

GREEN_E

GREEN_D

GREEN_C

GREEN_B

GREEN_A

YELLOW

YELLOW_E

YELLOW_D

YELLOW_C

YELLOW_B

YELLOW_A

GOLD

GOLD_E

GOLD_D

GOLD_C

GOLD_B

GOLD_A

RED

RED_E

RED_D

RED_C

RED_B

RED_A

MAROON

MAROON_E

MAROON_D

MAROON_C

MAROON_B

MAROON_A

PURPLE

PURPLE_E

PURPLE_D

PURPLE_C

PURPLE_B

PURPLE_A

GREY

GREY_E

GREY_D

GREY_C

GREY_B

GREY_A

Others

WHITE

BLACK

GREY_BROWN

DARK_BROWN

LIGHT_BROWN

PINK

LIGHT_PINK

GREEN_SCREEN

ORANGE