Add instructions for usage

README.md

@@ -3,3 +3,10 @@ Some parts of the python library [Manim](https://www.manim.community) need
 to be executed fast. This library contains code
 for these computations, but written in Rust
 to improve speed.
+
+## Testing
+1. Clone the repo
+2. Create a virtual environment using something like [`uv`](https://docs.astral.sh/uv/) (`uv venv`)
+3. Install dev dependencies (`uv sync`)
+4. Build the library (`uv run maturin develop --uv`)
+5. Run the example (`uv run manim -p examples/circle.py --disable_caching`)

examples/circle.py

@@ -0,0 +1,19 @@
+from manimforge.cairo import CairoCamera
+from manim import *
+
+def set_cairo_context_path(self, ctx, vmobject):
+    points = self.transform_points_pre_display(vmobject, vmobject.points)
+    if len(points) == 0:
+        return
+    CairoCamera().set_cairo_context_path(ctx, vmobject, np.asarray(points, dtype=np.float64))
+    return self
+
+# Monkeypatch the method
+Camera.set_cairo_context_path = set_cairo_context_path
+
+
+# Example Scene
+class Test(Scene):
+    def construct(self):
+        circle = Circle()
+        self.play(Create(circle))

pyproject.toml

@@ -5,7 +5,6 @@ build-backend = "maturin"
 [project]
 name = "manimforge"
 description = "Rust parts of the Animation Library Manim"
-version = "0.1.1"
 readme = "README.md"
 license = "MIT"
 requires-python = ">=3.9,<3.13"
@@ -22,5 +21,8 @@ documentation="https://docs.manim.community/"
 homepage="https://www.manim.community/"
 repository = "https://github.com/ManimCommunity/manim-forge"
 
+[dependency-groups]
+dev = ["manim>0.18.0,<0.20.0", "maturin==1.8.*"]
+
 [tool.maturin]
 features = ["pyo3/extension-module"]

src/cairo.rs

@@ -10,7 +10,7 @@ fn consider_points_equal_2d(p1: ArrayView1<f64>, p2: ArrayView1<f64>) -> bool {
     let rtol = 1e-5;
     let atol = 1e-6; // TODO make this based off vmobject
     ((p1[0] - p2[0]).abs() <= atol + rtol * p1[0].abs())
-        & ((p1[1] - p2[1]).abs() <= atol + rtol * p1[1].abs())
+        && ((p1[1] - p2[1]).abs() <= atol + rtol * p1[1].abs())
 }