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Assets/AVProVideo/Demos/Common/MediaPlayerUI/HorizontalSegmentsPrimitive.cs

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+// UnityEngine.UI was moved to a package in 2019.2.0
+// Unfortunately no way to test for this across all Unity versions yet
+// You can set up the asmdef to reference the new package, but the package doesn't 
+// existing in Unity 2017 etc, and it throws an error due to missing reference
+#define AVPRO_PACKAGE_UNITYUI
+#if (UNITY_2019_2_OR_NEWER && AVPRO_PACKAGE_UNITYUI) || (!UNITY_2019_2_OR_NEWER)
+
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace RenderHeads.Media.AVProVideo.Demos.UI
+{
+	/// Fill a rectangle region with horizontal segments along it
+	[ExecuteInEditMode]
+	public class HorizontalSegmentsPrimitive : Graphic
+	{
+		private float[] _segments = { 0f, 0f };
+		public float[] Segments { get { return _segments; } set { SetSegments(value); } }
+
+		private void SetSegments(float[] segments)
+		{
+			if (segments != null && segments.Length > 1)
+			{
+				_segments = segments;
+			}
+			else
+			{
+				_segments = new float[] { 0f, 0f };
+			}
+
+			// TODO: detect whether a change actually occured before setting to dirty
+			SetVerticesDirty();
+		}
+
+		protected override void OnPopulateMesh(VertexHelper vh)
+		{
+			Vector2 corner1 = Vector2.zero;
+			Vector2 corner2 = Vector2.zero;
+
+			corner1.x = 0f;
+			corner1.y = 0f;
+			corner2.x = 1f;
+			corner2.y = 1f;
+
+			corner1.x -= rectTransform.pivot.x;
+			corner1.y -= rectTransform.pivot.y;
+			corner2.x -= rectTransform.pivot.x;
+			corner2.y -= rectTransform.pivot.y;
+
+			corner1.x *= rectTransform.rect.width;
+			corner1.y *= rectTransform.rect.height;
+			corner2.x *= rectTransform.rect.width;
+			corner2.y *= rectTransform.rect.height;
+
+			vh.Clear();
+
+			int numQuads = _segments.Length / 2;
+
+			UIVertex vert = UIVertex.simpleVert;
+			int vi = 0;
+			for (int i = 0; i < numQuads; i++)
+			{
+				float x1 = _segments[i * 2 + 0] * (corner2.x - corner1.x) + corner1.x;
+				float x2 = _segments[i * 2 + 1] * (corner2.x - corner1.x) + corner1.x;
+
+				vert.position = new Vector2(x1, corner1.y);
+				vert.color = color;
+				vh.AddVert(vert);
+
+				vert.position = new Vector2(x1, corner2.y);
+				vert.color = color;
+				vh.AddVert(vert);
+
+				vert.position = new Vector2(x2, corner2.y);
+				vert.color = color;
+				vh.AddVert(vert);
+
+				vert.position = new Vector2(x2, corner1.y);
+				vert.color = color;
+				vh.AddVert(vert);
+
+				vh.AddTriangle(0 + vi, 1 + vi, 2 + vi);
+				vh.AddTriangle(2 + vi, 3 + vi, 0 + vi);
+				vi += 4;
+			}
+		}
+	}
+}
+#endif