constants常量

在manimlib/constants.py中定义了一些常用的常量，如下

定义的渲染画质

PRODUCTION_QUALITY_CAMERA_CONFIG = { # -w的画质
    "pixel_height": 1440,
    "pixel_width": 2560,
    "frame_rate": 60,
}

HIGH_QUALITY_CAMERA_CONFIG = { # --high_quality的画质
    "pixel_height": 1080,
    "pixel_width": 1920,
    "frame_rate": 60,
}

MEDIUM_QUALITY_CAMERA_CONFIG = { # -m的画质
    "pixel_height": 720,
    "pixel_width": 1280,
    "frame_rate": 30,
}

LOW_QUALITY_CAMERA_CONFIG = { # -l的画质
    "pixel_height": 480,
    "pixel_width": 854,
    "frame_rate": 15,
}

# 默认画质
DEFAULT_PIXEL_HEIGHT = PRODUCTION_QUALITY_CAMERA_CONFIG["pixel_height"]
DEFAULT_PIXEL_WIDTH = PRODUCTION_QUALITY_CAMERA_CONFIG["pixel_width"]
DEFAULT_FRAME_RATE = 60

点密度，线宽度

DEFAULT_POINT_DENSITY_2D = 25
DEFAULT_POINT_DENSITY_1D = 250

DEFAULT_STROKE_WIDTH = 4

画面上坐标的宽高

FRAME_HEIGHT = 8.0  # 画面高默认8个单位
FRAME_WIDTH = FRAME_HEIGHT * DEFAULT_PIXEL_WIDTH / DEFAULT_PIXEL_HEIGHT
FRAME_Y_RADIUS = FRAME_HEIGHT / 2
FRAME_X_RADIUS = FRAME_WIDTH / 2

buff

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 # 物体和边的距离
DEFAULT_MOBJECT_TO_MOBJECT_BUFFER = MED_SMALL_BUFF # 物体之间的距离

播放时间

DEFAULT_POINTWISE_FUNCTION_RUN_TIME = 3.0
DEFAULT_WAIT_TIME = 1.0

位置坐标

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

颜色

COLOR_MAP = {
    "DARK_BLUE": "#236B8E",
    "DARK_BROWN": "#8B4513",
    "LIGHT_BROWN": "#CD853F",
    "BLUE_E": "#1C758A",
    "BLUE_D": "#29ABCA",
    "BLUE_C": "#58C4DD",
    "BLUE_B": "#9CDCEB",
    "BLUE_A": "#C7E9F1",
    "TEAL_E": "#49A88F",
    "TEAL_D": "#55C1A7",
    "TEAL_C": "#5CD0B3",
    "TEAL_B": "#76DDC0",
    "TEAL_A": "#ACEAD7",
    "GREEN_E": "#699C52",
    "GREEN_D": "#77B05D",
    "GREEN_C": "#83C167",
    "GREEN_B": "#A6CF8C",
    "GREEN_A": "#C9E2AE",
    "YELLOW_E": "#E8C11C",
    "YELLOW_D": "#F4D345",
    "YELLOW_C": "#FFFF00",
    "YELLOW_B": "#FFEA94",
    "YELLOW_A": "#FFF1B6",
    "GOLD_E": "#C78D46",
    "GOLD_D": "#E1A158",
    "GOLD_C": "#F0AC5F",
    "GOLD_B": "#F9B775",
    "GOLD_A": "#F7C797",
    "RED_E": "#CF5044",
    "RED_D": "#E65A4C",
    "RED_C": "#FC6255",
    "RED_B": "#FF8080",
    "RED_A": "#F7A1A3",
    "MAROON_E": "#94424F",
    "MAROON_D": "#A24D61",
    "MAROON_C": "#C55F73",
    "MAROON_B": "#EC92AB",
    "MAROON_A": "#ECABC1",
    "PURPLE_E": "#644172",
    "PURPLE_D": "#715582",
    "PURPLE_C": "#9A72AC",
    "PURPLE_B": "#B189C6",
    "PURPLE_A": "#CAA3E8",
    "WHITE": "#FFFFFF",
    "BLACK": "#000000",
    "LIGHT_GRAY": "#BBBBBB",
    "LIGHT_GREY": "#BBBBBB",
    "GRAY": "#888888",
    "GREY": "#888888",
    "DARK_GREY": "#444444",
    "DARK_GRAY": "#444444",
    "DARKER_GREY": "#222222",
    "DARKER_GRAY": "#222222",
    "GREY_BROWN": "#736357",
    "PINK": "#D147BD",
    "LIGHT_PINK": "#DC75CD",
    "GREEN_SCREEN": "#00FF00",
    "ORANGE": "#FF862F",
}
PALETTE = list(COLOR_MAP.values())
locals().update(COLOR_MAP)
for name in [s for s in list(COLOR_MAP.keys()) if s.endswith("_C")]:
    locals()[name.replace("_C", "")] = locals()[name]

具体的颜色效果可以在这里查看

另外，在pycharm编辑器中颜色会警告，可以调小警告等级。在vscode中如果你安装了python扩展也会发出警告，其原因是vscode在检测变量时并不会识别在运行时添加的变量，所以需要将COLOR_MAP中的颜色提取出来作为常量令vscode识别。 你需要注释这两行代码：

#for name in [s for s in list(COLOR_MAP.keys()) if s.endswith("_C")]:
#    locals()[name.replace("_C", "")] = locals()[name]

并将下方代码复制在constants.py中：

DARK_BLUE="#236B8E"
DARK_BROWN="#8B4513"
LIGHT_BROWN="#CD853F"
BLUE_E="#1C758A"
BLUE_D="#29ABCA"
BLUE_C="#58C4DD"
BLUE_B="#9CDCEB"
BLUE_A="#C7E9F1"
TEAL_E="#49A88F"
TEAL_D="#55C1A7"
TEAL_C="#5CD0B3"
TEAL_B="#76DDC0"
TEAL_A="#ACEAD7"
GREEN_E="#699C52"
GREEN_D="#77B05D"
GREEN_C="#83C167"
GREEN_B="#A6CF8C"
GREEN_A="#C9E2AE"
YELLOW_E="#E8C11C"
YELLOW_D="#F4D345"
YELLOW_C="#FFFF00"
YELLOW_B="#FFEA94"
YELLOW_A="#FFF1B6"
GOLD_E="#C78D46"
GOLD_D="#E1A158"
GOLD_C="#F0AC5F"
GOLD_B="#F9B775"
GOLD_A="#F7C797"
RED_E="#CF5044"
RED_D="#E65A4C"
RED_C="#FC6255"
RED_B="#FF8080"
RED_A="#F7A1A3"
MAROON_E="#94424F"
MAROON_D="#A24D61"
MAROON_C="#C55F73"
MAROON_B="#EC92AB"
MAROON_A="#ECABC1"
PURPLE_E="#644172"
PURPLE_D="#715582"
PURPLE_C="#9A72AC"
PURPLE_B="#B189C6"
PURPLE_A="#CAA3E8"
WHITE="#FFFFFF"
BLACK="#000000"
LIGHT_GRAY="#BBBBBB"
LIGHT_GREY="#BBBBBB"
GRAY="#888888"
GREY="#888888"
DARK_GREY="#444444"
DARK_GRAY="#444444"
DARKER_GREY="#222222"
DARKER_GRAY="#222222"
GREY_BROWN="#736357"
PINK="#D147BD"
LIGHT_PINK="#DC75CD"
GREEN_SCREEN="#00FF00"
ORANGE="#FF862F"
BLUE="#58C4DD"
TEAL="#5CD0B3"
GREEN="#83C167"
YELLOW="#FFFF00"
GOLD="#F0AC5F"
RED="#FC6255"
MAROON="#C55F73"
PURPLE="#9A72AC"