// Unity C# reference source
// Copyright (c) Unity Technologies. For terms of use, see
// https://unity3d.com/legal/licenses/Unity_Reference_Only_License

using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UIElements;

namespace UnityEditor.Experimental.GraphView
{
 class LineView : VisualElement
 {
 // color for lines
 internal static PrefColor s_SnappingLineColor = new PrefColor("General/Graph Snapping Line Color", 68 / 255f, 192 / 255f, 255 / 255f, 0.2f);

 public List<Line2> lines { get; private set; } = new List<Line2>();
 public LineView()
 {
 this.StretchToParentSize();
 generateVisualContent += OnGenerateVisualContent;
 }

 void OnGenerateVisualContent(MeshGenerationContext mgc)
 {
 GraphView gView = GetFirstAncestorOfType<GraphView>();
 if (gView == null)
 return;

 VisualElement container = gView.contentViewContainer;
 foreach (Line2 line in lines)
 {
 Vector2 start = container.ChangeCoordinatesTo(gView, line.start);
 Vector2 end = container.ChangeCoordinatesTo(gView, line.end);
 float x = Math.Min(start.x, end.x);
 float y = Math.Min(start.y, end.y);
 float width = Math.Max(1, Math.Abs(start.x - end.x));
 float height = Math.Max(1, Math.Abs(start.y - end.y));

 var rect = new Rect(x, y, width, height);

 mgc.Rectangle(MeshGenerationContextUtils.RectangleParams.MakeSolid(rect, s_SnappingLineColor, ContextType.Editor));
 }
 }
 }
}