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Source/Editor/Gizmo/GridGizmo.cs

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+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+using System;
+using FlaxEngine;
+
+namespace FlaxEditor.Gizmo
+{
+    /// <summary>
+    /// Draws a grid to feel better world origin position and the world units.
+    /// </summary>
+    /// <seealso cref="FlaxEditor.Gizmo.GizmoBase" />
+    [HideInEditor]
+    public class GridGizmo : GizmoBase
+    {
+        private bool _enabled = true;
+
+        /// <summary>
+        /// Gets or sets a value indicating whether this <see cref="GridGizmo"/> is enabled.
+        /// </summary>
+        public bool Enabled
+        {
+            get => _enabled;
+            set
+            {
+                if (_enabled != value)
+                {
+                    _enabled = value;
+                    EnabledChanged?.Invoke(this);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Occurs when enabled state gets changed.
+        /// </summary>
+        public event Action<GridGizmo> EnabledChanged;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="GridGizmo"/> class.
+        /// </summary>
+        /// <param name="owner">The gizmos owner.</param>
+        public GridGizmo(IGizmoOwner owner)
+        : base(owner)
+        {
+        }
+
+        /// <inheritdoc />
+        public override void Draw(ref RenderContext renderContext)
+        {
+            if (!Enabled)
+                return;
+
+            var viewPos = Owner.ViewPosition;
+            var plane = new Plane(Vector3.Zero, Vector3.UnitY);
+            float dst = CollisionsHelper.DistancePlanePoint(ref plane, ref viewPos);
+
+            float space, size;
+            if (dst <= 500.0f)
+            {
+                space = 50;
+                size = 8000;
+            }
+            else if (dst <= 2000.0f)
+            {
+                space = 100;
+                size = 8000;
+            }
+            else
+            {
+                space = 1000;
+                size = 100000;
+            }
+
+            Color color = Color.Gray * 0.7f;
+            int count = (int)(size / space);
+
+            Vector3 start = new Vector3(0, 0, size * -0.5f);
+            Vector3 end = new Vector3(0, 0, size * 0.5f);
+
+            for (int i = 0; i <= count; i++)
+            {
+                start.X = end.X = i * space + start.Z;
+                DebugDraw.DrawLine(start, end, color);
+            }
+
+            start = new Vector3(size * -0.5f, 0, 0);
+            end = new Vector3(size * 0.5f, 0, 0);
+
+            for (int i = 0; i <= count; i++)
+            {
+                start.Z = end.Z = i * space + start.X;
+                DebugDraw.DrawLine(start, end, color);
+            }
+        }
+    }
+}