86 lines
3.0 KiB
C#
86 lines
3.0 KiB
C#
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/// Credit Alastair Aitchison
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/// Sourced from - https://bitbucket.org/UnityUIExtensions/unity-ui-extensions/issues/123/uilinerenderer-issues-with-specifying
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namespace UnityEngine.UI.Extensions
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{
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[AddComponentMenu("UI/Extensions/UI Line Connector")]
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[RequireComponent(typeof(UILineRenderer))]
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[ExecuteInEditMode]
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public class UILineConnector : MonoBehaviour
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{
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// The elements between which line segments should be drawn
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public RectTransform[] transforms;
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private Vector3[] previousPositions;
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private RectTransform canvas;
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private RectTransform rt;
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private UILineRenderer lr;
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private void Awake()
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{
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canvas = GetComponentInParent<RectTransform>().GetParentCanvas().GetComponent<RectTransform>();
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rt = GetComponent<RectTransform>();
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lr = GetComponent<UILineRenderer>();
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}
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// Update is called once per frame
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void Update()
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{
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if (transforms == null || transforms.Length < 1)
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{
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return;
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}
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//Performance check to only redraw when the child transforms move
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if (previousPositions != null && previousPositions.Length == transforms.Length)
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{
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bool updateLine = false;
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for (int i = 0; i < transforms.Length; i++)
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{
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if (!updateLine && previousPositions[i] != transforms[i].position)
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{
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updateLine = true;
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}
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}
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if (!updateLine) return;
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}
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// Get the pivot points
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Vector2 thisPivot = rt.pivot;
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Vector2 canvasPivot = canvas.pivot;
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// Set up some arrays of coordinates in various reference systems
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Vector3[] worldSpaces = new Vector3[transforms.Length];
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Vector3[] canvasSpaces = new Vector3[transforms.Length];
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Vector2[] points = new Vector2[transforms.Length];
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// First, convert the pivot to worldspace
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for (int i = 0; i < transforms.Length; i++)
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{
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worldSpaces[i] = transforms[i].TransformPoint(thisPivot);
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}
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// Then, convert to canvas space
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for (int i = 0; i < transforms.Length; i++)
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{
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canvasSpaces[i] = canvas.InverseTransformPoint(worldSpaces[i]);
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}
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// Calculate delta from the canvas pivot point
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for (int i = 0; i < transforms.Length; i++)
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{
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points[i] = new Vector2(canvasSpaces[i].x, canvasSpaces[i].y);
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}
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// And assign the converted points to the line renderer
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lr.Points = points;
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lr.RelativeSize = false;
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lr.drivenExternally = true;
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previousPositions = new Vector3[transforms.Length];
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for (int i = 0; i < transforms.Length; i++)
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{
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previousPositions[i] = transforms[i].position;
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}
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}
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}
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}
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