Added 5 different Arrow tip shapes

manim/mobject/geometry/tips.py

@@ -11,8 +11,14 @@
     "ArrowTriangleTip",
     "ArrowTriangleFilledTip",
     "StealthTip",
+    "CurvedTip1",
+    "CurvedTip2",
+    "CurvedTip3",
+    "TriangleTip1",
+    "TriangleTip2",
 ]
 
+import warnings
 from typing import TYPE_CHECKING, Any
 
 import numpy as np
@@ -217,7 +223,16 @@ def __init__(
         start_angle: float = PI,
         **kwargs: Any,
     ):
-        self.start_angle = start_angle
+        if start_angle != PI:
+            warnings.warn(
+                (
+                    "start_angle is deprecated for StealthTip "
+                    "and has no effect. It will be removed in "
+                    "a future version of Manim Community ."
+                ),
+                DeprecationWarning,
+                stacklevel=2,
+            )
         VMobject.__init__(
             self, fill_opacity=fill_opacity, stroke_width=stroke_width, **kwargs
         )
@@ -293,7 +308,16 @@ def __init__(
         start_angle: float = PI,
         **kwargs: Any,
     ) -> None:
-        self.start_angle = start_angle
+        if start_angle != PI:
+            warnings.warn(
+                (
+                    "start_angle is deprecated for ArrowCircleTip "
+                    "and has no effect. It will be removed in "
+                    "a future version of Manim Community ."
+                ),
+                DeprecationWarning,
+                stacklevel=2,
+            )
         Circle.__init__(
             self, fill_opacity=fill_opacity, stroke_width=stroke_width, **kwargs
         )
@@ -321,7 +345,16 @@ def __init__(
         start_angle: float = PI,
         **kwargs: Any,
     ) -> None:
-        self.start_angle = start_angle
+        if start_angle != PI:
+            warnings.warn(
+                (
+                    "start_angle is deprecated for ArrowSquareTip "
+                    "and has no effect. It will be removed in "
+                    "a future version of Manim Community ."
+                ),
+                DeprecationWarning,
+                stacklevel=2,
+            )
         Square.__init__(
             self,
             fill_opacity=fill_opacity,
@@ -340,3 +373,175 @@ def __init__(
         self, fill_opacity: float = 1, stroke_width: float = 0, **kwargs: Any
     ) -> None:
         super().__init__(fill_opacity=fill_opacity, stroke_width=stroke_width, **kwargs)
+
+
+class CurvedTip1(ArrowTip):
+    """Inward curved arrow shape."""
+
+    def __init__(
+        self,
+        fill_opacity: float = 1,
+        stroke_width: float = 3,
+        length: float = DEFAULT_ARROW_TIP_LENGTH / 2,
+        **kwargs: Any,
+    ):
+        VMobject.__init__(
+            self, fill_opacity=fill_opacity, stroke_width=stroke_width, **kwargs
+        )
+        tip = np.array([1.5, 0, 0])
+        top = np.array([0, 0.7, 0])
+        bottom = np.array([0, -0.7, 0])
+        sag = 0.1
+
+        self.start_new_path(tip)
+
+        self.add_cubic_bezier_curve_to(
+            tip + (top - tip) / 3 + np.array([0, -sag, 0]),
+            tip + (top - tip) * 2 / 3 + np.array([0, -sag, 0]),
+            top,
+        )
+
+        self.add_line_to(bottom)
+
+        self.add_cubic_bezier_curve_to(
+            bottom + (tip - bottom) / 3 + np.array([0, sag, 0]),
+            bottom + (tip - bottom) * 2 / 3 + np.array([0, sag, 0]),
+            tip,
+        )
+
+        self.scale(length / (1.3 * self.length))
+
+
+class CurvedTip2(ArrowTip):
+    """Outward curved arrow shape."""
+
+    def __init__(
+        self,
+        fill_opacity: float = 1,
+        stroke_width: float = 3,
+        length: float = DEFAULT_ARROW_TIP_LENGTH / 2,
+        **kwargs: Any,
+    ):
+        VMobject.__init__(
+            self, fill_opacity=fill_opacity, stroke_width=stroke_width, **kwargs
+        )
+        tip = np.array([1.5, 0, 0])
+        top = np.array([0, 0.7, 0])
+        bottom = np.array([0, -0.7, 0])
+        sag = 0.1
+
+        self.start_new_path(tip)
+
+        self.add_cubic_bezier_curve_to(
+            tip + (top - tip) / 3 + np.array([0, sag, 0]),
+            tip + (top - tip) * 2 / 3 + np.array([0, sag, 0]),
+            top,
+        )
+
+        self.add_line_to(bottom)
+
+        self.add_cubic_bezier_curve_to(
+            bottom + (tip - bottom) / 3 + np.array([0, -sag, 0]),
+            bottom + (tip - bottom) * 2 / 3 + np.array([0, -sag, 0]),
+            tip,
+        )
+
+        self.scale(length / (1.3 * self.length))
+
+
+class CurvedTip3(ArrowTip):
+    """Curved arrow shape."""
+
+    def __init__(
+        self,
+        fill_opacity: float = 1,
+        stroke_width: float = 3,
+        length: float = DEFAULT_ARROW_TIP_LENGTH / 2,
+        **kwargs: Any,
+    ):
+        VMobject.__init__(
+            self, fill_opacity=fill_opacity, stroke_width=stroke_width, **kwargs
+        )
+        tip = np.array([2.0, 0.00, 0])
+
+        self.start_new_path(tip)
+
+        self.add_cubic_bezier_curve_to(
+            np.array([1, 0.75, 0]),
+            np.array([0, 0.95, 0]),
+            np.array([-1.0, 1.0, 0]),
+        )
+
+        self.add_cubic_bezier_curve_to(
+            np.array([-0.65, 0.77, 0]),
+            np.array([-0.25, 0.4, 0]),
+            [0, 0, 0],
+        )
+
+        self.add_cubic_bezier_curve_to(
+            np.array([-0.25, -0.4, 0]),
+            np.array([-0.65, -0.77, 0]),
+            np.array([-1.0, -1.0, 0]),
+        )
+        self.add_cubic_bezier_curve_to(
+            np.array([0, -0.95, 0]),
+            np.array([1, -0.75, 0]),
+            tip,
+        )
+        self.scale(length / (1.5 * self.length))
+
+
+class TriangleTip1(ArrowTip):
+    """Elongated triangle arrow shape."""
+
+    def __init__(
+        self,
+        fill_opacity: float = 1,
+        stroke_width: float = 3,
+        length: float = DEFAULT_ARROW_TIP_LENGTH / 2,
+        **kwargs: Any,
+    ):
+        VMobject.__init__(
+            self, fill_opacity=fill_opacity, stroke_width=stroke_width, **kwargs
+        )
+        tip = np.array([2.0, 0, 0])
+
+        self.start_new_path(tip)
+
+        self.add_points_as_corners(
+            [
+                np.array([0, 0.6, 0]),
+                np.array([0, -0.6, 0]),
+                np.array([2.0, 0.0, 0]),
+            ]
+        )
+        self.scale(length / self.length)
+
+
+class TriangleTip2(ArrowTip):
+    """Modified triangle arrow shape."""
+
+    def __init__(
+        self,
+        fill_opacity: float = 1,
+        stroke_width: float = 3,
+        length: float = DEFAULT_ARROW_TIP_LENGTH / 2,
+        **kwargs: Any,
+    ):
+        VMobject.__init__(
+            self, fill_opacity=fill_opacity, stroke_width=stroke_width, **kwargs
+        )
+        tip = np.array([3.0, 0.0, 0])
+
+        self.start_new_path(tip)
+
+        self.add_points_as_corners(
+            [
+                np.array([0.5, 1, 0]),
+                np.array([0, 0.25, 0]),
+                np.array([0, -0.25, 0]),
+                np.array([0.5, -1, 0]),
+                np.array([3.0, 0.0, 0]),
+            ]
+        )
+        self.scale(length / self.length)