94 lines
3.5 KiB
C#
94 lines
3.5 KiB
C#
/// <summary>
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/// Curved Layout Group Created by Freezy - http://www.ElicitIce.com
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/// Posted on Unity Forums http://forum.unity3d.com/threads/curved-layout.403985/
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///
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/// Free for any use and alteration, source code may not be sold without my permission.
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/// If you make improvements on this script please share them with the community.
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///
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/// </summary>
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namespace UnityEngine.UI.Extensions
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{
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/// <summary>
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/// TODO:
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/// - add automatic child sizing, like in the HorizontalOrVerticalLayoutGroup.cs
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/// - nicer anchor handling for initial child positions
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/// </summary>
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[AddComponentMenu("Layout/Extensions/Curved Layout")]
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public class CurvedLayout : LayoutGroup {
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public Vector3 CurveOffset;
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// Yes these two could be combined into a single vector
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// but this makes it easier to use?
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[Tooltip("axis along which to place the items, Normalized before use")]
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public Vector3 itemAxis;
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[Tooltip("size of each item along the Normalized axis")]
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public float itemSize;
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// the slope can be moved by altering this setting, it could be constrained to the 0-1 range, but other values are usefull for animations
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public float centerpoint = 0.5f;
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protected override void OnEnable() { base.OnEnable(); CalculateRadial(); }
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public override void SetLayoutHorizontal() {
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}
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public override void SetLayoutVertical() {
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}
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public override void CalculateLayoutInputVertical() {
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CalculateRadial();
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}
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public override void CalculateLayoutInputHorizontal() {
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CalculateRadial();
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}
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#if UNITY_EDITOR
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protected override void OnValidate() {
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base.OnValidate();
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CalculateRadial();
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}
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#endif
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void CalculateRadial() {
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m_Tracker.Clear();
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if (transform.childCount == 0)
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return;
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//one liner for figuring out the desired pivot (should be moved into a utility function)
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Vector2 pivot = new Vector2(((int)childAlignment % 3) * 0.5f, ((int)childAlignment / 3) * 0.5f);
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//this seems to work ok-ish
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Vector3 lastPos = new Vector3(
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GetStartOffset(0, GetTotalPreferredSize(0)),
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GetStartOffset(1, GetTotalPreferredSize(1)),
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0f
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);
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// 0 = first, 1 = last child
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float lerp = 0;
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//no need to catch divide by 0 as childCount > 0
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float step = 1f / transform.childCount;
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//normalize and create a distance between items
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var dist = itemAxis.normalized * itemSize;
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for (int i = 0; i < transform.childCount; i++) {
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RectTransform child = (RectTransform)transform.GetChild(i);
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if (child != null) {
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//stop the user from altering certain values in the editor
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m_Tracker.Add(this, child,
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DrivenTransformProperties.Anchors |
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DrivenTransformProperties.AnchoredPosition |
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DrivenTransformProperties.Pivot);
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Vector3 vPos = lastPos + dist;
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child.localPosition = lastPos = vPos + (lerp - centerpoint) * CurveOffset;
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child.pivot = pivot;
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//child anchors are not yet calculated, each child should set it's own size for now
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child.anchorMin = child.anchorMax = new Vector2(0.5f, 0.5f);
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lerp += step;
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}
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}
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}
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}
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}
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