UXML element CurveField

A CurveField is an Editor-only control that lets users select a curve from a curve editor. You can use a CurveField to display a curve to visualize its properties or create and adjust curves for animatable properties in an Animation ClipAnimation data that can be used for animated characters or simple animations. It is a simple “unit” piece of motion, such as (one specific instance of) “Idle”, “Walk” or “Run”. More info
See in Glossary, providing precise control over how these properties change over time.

Note: To align an element with other fields in an InspectorA Unity window that displays information about the currently selected GameObject, asset or project settings, allowing you to inspect and edit the values. More info
See in Glossary window, simply apply the .unity-base-field__aligned USS class to it. For more information, refer to BaseField.

Create a CurveField

You can create a CurveField with UI(User Interface) Allows a user to interact with your application. Unity currently supports three UI systems. More info
See in Glossary Builder, UXML, or C#. The following C# example creates a CurveField with a default curve:

using UnityEditor.UIElements;
...
// Create a CurveField
var curveField = new CurveField();
// Set the curve
curveField.value = new AnimationCurve(new Keyframe(0, 0), new Keyframe(1, 1), new Keyframe(2, 2), new Keyframe(3, 3));
// Set the width and height of the curve editor
curveField.style.width = 300;
curveField.style.height = 400;

Example

The following UXML example creates a CurveField:

<UXML xmlns="UnityEngine.UIElements" xmlns:uie="UnityEditor.UIElements">
    <uie:CurveField label="UXML Field" name="the-uxml-field" />
</UXML>

The following C# example illustrates some of the customizable functionalities of the CurveField:

/// <sample>
// Get a reference to the field from UXML and assign a value to it.
var uxmlField = container.Q<CurveField>("the-uxml-field");
uxmlField.value = new AnimationCurve(new Keyframe[]
    { new Keyframe(0, 0), new Keyframe(5, 8), new Keyframe(10, 4) });

// Create a new field, disable it, and give it a style class.
var csharpField = new CurveField("C# Field");
csharpField.SetEnabled(false);
csharpField.AddToClassList("some-styled-field");
csharpField.value = uxmlField.value;
container.Add(csharpField);

// Mirror the value of the UXML field into the C# field.
uxmlField.RegisterCallback<ChangeEvent<AnimationCurve>>((evt) =>
{
    csharpField.value = evt.newValue;
});
/// </sample>

To try this example live in Unity, go to Window > UI Toolkit > Samples.

C# base class and namespace

C# class: CurveField
Namespace: UnityEditor.UIElements
Base class: BaseField_1

Inherited UXML attributes

This element inherits the following attributes from its base class:

This element also inherits the following attributes from VisualElement:

USS classes

The following table lists all the C# public property names and their related USS selector.

You can also use the Matching Selectors section in the Inspector or the UI Toolkit Debugger to see which USS selectors affect the components of the VisualElement at every level of its hierarchy.

Additional resources

• AnimationClip