From 63f6e9d84ff5685e78dc923e401ac980202263cb Mon Sep 17 00:00:00 2001
From: Grant Sanderson <grant@3blue1brown.com>
Date: Sat, 10 Jun 2023 09:21:57 -0700
Subject: [PATCH] Add Dartboard

---
 manimlib/mobject/svg/drawings.py | 52 ++++++++++++++++++++++++++++++--
 1 file changed, 50 insertions(+), 2 deletions(-)

diff --git a/manimlib/mobject/svg/drawings.py b/manimlib/mobject/svg/drawings.py
index 927554b8..f620b47a 100644
--- a/manimlib/mobject/svg/drawings.py
+++ b/manimlib/mobject/svg/drawings.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import numpy as np
+import itertools as it
 
 from manimlib.animation.composition import AnimationGroup
 from manimlib.animation.rotation import Rotating
@@ -14,6 +15,7 @@ from manimlib.constants import DOWN
 from manimlib.constants import FRAME_WIDTH
 from manimlib.constants import GREEN
 from manimlib.constants import GREEN_SCREEN
+from manimlib.constants import GREEN_E
 from manimlib.constants import GREY
 from manimlib.constants import GREY_A
 from manimlib.constants import GREY_B
@@ -26,6 +28,7 @@ from manimlib.constants import ORIGIN
 from manimlib.constants import OUT
 from manimlib.constants import PI
 from manimlib.constants import RED
+from manimlib.constants import RED_E
 from manimlib.constants import RIGHT
 from manimlib.constants import SMALL_BUFF
 from manimlib.constants import SMALL_BUFF
@@ -36,6 +39,7 @@ from manimlib.constants import DL
 from manimlib.constants import DR
 from manimlib.constants import WHITE
 from manimlib.constants import YELLOW
+from manimlib.constants import TAU
 from manimlib.mobject.boolean_ops import Difference
 from manimlib.mobject.geometry import Arc
 from manimlib.mobject.geometry import Circle
@@ -44,6 +48,7 @@ from manimlib.mobject.geometry import Line
 from manimlib.mobject.geometry import Polygon
 from manimlib.mobject.geometry import Rectangle
 from manimlib.mobject.geometry import Square
+from manimlib.mobject.geometry import AnnularSector
 from manimlib.mobject.mobject import Mobject
 from manimlib.mobject.numbers import Integer
 from manimlib.mobject.svg.svg_mobject import SVGMobject
@@ -579,7 +584,6 @@ class Piano3D(VGroup):
                 key.set_color(BLACK)
 
 
-
 class DieFace(VGroup):
     def __init__(
         self,
@@ -590,7 +594,7 @@ class DieFace(VGroup):
         stroke_width: float = 2.0,
         fill_color: ManimColor = GREY_E,
         dot_radius: float = 0.08,
-        dot_color: ManimColor = BLUE_B,
+        dot_color: ManimColor = WHITE,
         dot_coalesce_factor: float = 0.5
     ):
         dot = Dot(radius=dot_radius, fill_color=dot_color)
@@ -625,3 +629,47 @@ class DieFace(VGroup):
         self.dots = arrangement
         self.value = value
         self.index = value
+
+
+class Dartboard(VGroup):
+    radius = 3
+    n_sectors = 20
+
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+        n_sectors = self.n_sectors
+        angle = TAU / n_sectors
+
+        segments = VGroup(*[
+            VGroup(*[
+                AnnularSector(
+                    inner_radius=in_r,
+                    outer_radius=out_r,
+                    start_angle=n * angle,
+                    angle=angle,
+                    fill_color=color,
+                )
+                for n, color in zip(
+                    range(n_sectors),
+                    it.cycle(colors)
+                )
+            ])
+            for colors, in_r, out_r in [
+                ([GREY_B, GREY_E], 0, 1),
+                ([GREEN_E, RED_E], 0.5, 0.55),
+                ([GREEN_E, RED_E], 0.95, 1),
+            ]
+        ])
+        segments.rotate(-angle / 2)
+        bullseyes = VGroup(*[
+            Circle(radius=r)
+            for r in [0.07, 0.035]
+        ])
+        bullseyes.set_fill(opacity=1)
+        bullseyes.set_stroke(width=0)
+        bullseyes[0].set_color(GREEN_E)
+        bullseyes[1].set_color(RED_E)
+
+        self.bullseye = bullseyes[1]
+        self.add(*segments, *bullseyes)
+        self.scale(self.radius)