/// Credit zge /// Sourced from - http://forum.unity3d.com/threads/draw-circles-or-primitives-on-the-new-ui-canvas.272488/#post-2293224 using System.Collections.Generic; namespace UnityEngine.UI.Extensions { [AddComponentMenu("UI/Extensions/Primitives/UI Circle")] public class UICircle : MaskableGraphic { [SerializeField] Texture m_Texture; [Range(0, 100)] public int fillPercent = 100; public bool fill = true; public float thickness = 5; [Range(0, 360)] public int segments = 360; public override Texture mainTexture { get { return m_Texture == null ? s_WhiteTexture : m_Texture; } } /// /// Texture to be used. /// public Texture texture { get { return m_Texture; } set { if (m_Texture == value) return; m_Texture = value; SetVerticesDirty(); SetMaterialDirty(); } } void Update() { this.thickness = (float)Mathf.Clamp(this.thickness, 0, rectTransform.rect.width / 2); } protected UIVertex[] SetVbo(Vector2[] vertices, Vector2[] uvs) { UIVertex[] vbo = new UIVertex[4]; for (int i = 0; i < vertices.Length; i++) { var vert = UIVertex.simpleVert; vert.color = color; vert.position = vertices[i]; vert.uv0 = uvs[i]; vbo[i] = vert; } return vbo; } protected override void OnPopulateMesh(Mesh toFill) { float outer = -rectTransform.pivot.x * rectTransform.rect.width; float inner = -rectTransform.pivot.x * rectTransform.rect.width + this.thickness; toFill.Clear(); var vbo = new VertexHelper(toFill); Vector2 prevX = Vector2.zero; Vector2 prevY = Vector2.zero; Vector2 uv0 = new Vector2(0, 0); Vector2 uv1 = new Vector2(0, 1); Vector2 uv2 = new Vector2(1, 1); Vector2 uv3 = new Vector2(1, 0); Vector2 pos0; Vector2 pos1; Vector2 pos2; Vector2 pos3; float f = (this.fillPercent / 100f); float degrees = 360f / segments; int fa = (int)((segments + 1) * f); for (int i = 0; i < fa; i++) { float rad = Mathf.Deg2Rad * (i * degrees); float c = Mathf.Cos(rad); float s = Mathf.Sin(rad); uv0 = new Vector2(0, 1); uv1 = new Vector2(1, 1); uv2 = new Vector2(1, 0); uv3 = new Vector2(0, 0); pos0 = prevX; pos1 = new Vector2(outer * c, outer * s); if (fill) { pos2 = Vector2.zero; pos3 = Vector2.zero; } else { pos2 = new Vector2(inner * c, inner * s); pos3 = prevY; } prevX = pos1; prevY = pos2; vbo.AddUIVertexQuad(SetVbo(new[] { pos0, pos1, pos2, pos3 }, new[] { uv0, uv1, uv2, uv3 })); } if (vbo.currentVertCount > 3) { vbo.FillMesh(toFill); } } } }