# EllipseImplicitEquation struct

Namespace: [Grasshopper2.Eto.Drawing](https://developer.rhino3d.com/api/gh2/namespace/grasshopper2.eto.drawing.md) · Assembly: [Grasshopper2](https://developer.rhino3d.com/api/gh2/assembly/grasshopper2.md)

```cs
public struct EllipseImplicitEquation
```

Represents the implicit equation of an ellipse.

## Constructors

- [EllipseImplicitEquation](https://developer.rhino3d.com/api/gh2/type/grasshopper2.eto.drawing.ellipseimplicitequation/ctor.md): (2 overloads) Construct a new rotated ellipse equation.

## Methods

- [Evaluate](https://developer.rhino3d.com/api/gh2/type/grasshopper2.eto.drawing.ellipseimplicitequation/evaluate.md): Evaluate a coordinate pair. Zero scalar reside on the ellipse, negative values are inside the ellipse. The centre of the ellipse is associated with the most negative value of -(radiusx * radiusy).
- [ToString](https://developer.rhino3d.com/api/gh2/type/grasshopper2.eto.drawing.ellipseimplicitequation/tostring.md): Returns the fully qualified type name of this instance.