Unity UI Extensions

UISquircle

A primitive that renders smooth superellipse shapes (squircles) with configurable curvature, offering an elegant alternative to sharp corners or simple rounded rectangles.

Contents

1 Overview

2 Properties

3 Methods

4 Usage

5 Video Demo

6 See also

7 Credits and Donation

8 External links

Overview

The UISquircle primitive renders superellipse shapes (commonly called “squircles”) using the mathematical formula x/a ^n + y/b ^n = 1. These shapes provide a smooth, aesthetically pleasing alternative to sharp corners or simple rounded rectangles. The component supports two modes: Classic (fits shape to RectTransform dimensions) and Scaled (uniform scaling with configurable radius), and includes quality optimization to reduce vertex count.

Properties

The properties of the UISquircle control are as follows:

Property Description
Squircle Type Shape calculation mode: Classic (scales to RectTransform width/height) or Scaled (uniform scaling with radius constraint)
N Curvature exponent from 1 to 40 (default: 4). Higher values = sharper corners, lower = rounder. Classic squircle uses n=4
Delta Step size for vertex generation (default: 5). Smaller = more vertices = smoother curve
Quality Vertex optimization threshold (default: 0.1). Higher values = fewer vertices = lower quality
Radius Maximum radius for Scaled mode (default: 1000). Constrains the shape size

Methods

The UISquircle control does not expose public methods beyond inherited base class functionality.

Usage

To use the UISquircle primitive:

  1. Add the component via “Add Component -> UI -> Extensions -> Primitives -> Squircle”
  2. Choose Squircle Type:
    • Classic: Shape scales to fill RectTransform dimensions (may be non-uniform)
    • Scaled: Shape maintains uniform circular scaling within specified radius
  3. Adjust N to control corner sharpness (4 = classic squircle, lower = rounder, higher = sharper)
  4. Tune Delta and Quality to balance smoothness vs. performance
  5. For Scaled mode, set Radius to constrain maximum size

Example code for runtime squircle configuration:

using UnityEngine.UI.Extensions;

public class SquircleExample : MonoBehaviour
{
    public UISquircle squircle;

    void Start()
    {
        // Configure as classic squircle
        squircle.squircleType = UISquircle.Type.Classic;
        squircle.n = 4f;       // Classic squircle value
        squircle.delta = 3f;   // Smoother curve
        squircle.quality = 0.1f;
    }
    
    void MakeRounder()
    {
        // Lower n = rounder corners
        squircle.n = 2f;
        squircle.SetVerticesDirty();
    }
    
    void MakeSharper()
    {
        // Higher n = sharper corners
        squircle.n = 8f;
        squircle.SetVerticesDirty();
    }
    
    void UseScaledMode()
    {
        // Switch to uniform scaling
        squircle.squircleType = UISquircle.Type.Scaled;
        squircle.radius = 200f;
        squircle.SetVerticesDirty();
    }
}

Performance Note: The editor inspector displays the current vertex count. Adjust Quality and Delta to optimize. Higher Quality values remove more vertices but may reduce smoothness.

Video Demo

Video demonstration to be added

See also

Credits and Donation

Credits: Soprachev Andrei

No external source link provided

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