using System;
using CPF.Drawing;
using CPF.ReoGrid.Drawing;

namespace CPF.ReoGrid.Common
{
	internal static class GraphicsToolkit
	{
		public static bool PointInRect(Rect rect, Point p)
		{
			return rect.Left <= p.X && rect.Top <= p.Y && rect.Right >= p.X && rect.Bottom >= p.Y;
		}

		public static double DistancePointToLine(Point startPoint, Point endPoint, Point target)
		{
			return GraphicsToolkit.DistancePointToLine(startPoint.X, startPoint.Y, endPoint.X, endPoint.Y, target);
		}

		public static double DistancePointToLine(float x1, float y1, float x2, float y2, Point target)
		{
			double num = (double)(y2 - y1);
			double num2 = (double)(x1 - x2);
			double num3 = (double)(x2 * y1 - x1 * y2);
			return Math.Abs(num * (double)target.X + num2 * (double)target.Y + num3) / Math.Sqrt(num * num + num2 * num2);
		}

		public static double DistancePointToPolygonBound(Point[] points, Point p, double min = 9999999.0, bool firstReturn = false)
		{
			double num = min + 1.0;
			Point startPoint = points[points.Length - 1];
			foreach (Point point in points)
			{
				double num2 = GraphicsToolkit.DistancePointToLine(startPoint, point, p);
				bool flag = num > num2;
				if (flag)
				{
					num = num2;
				}
				startPoint = point;
			}
			return num;
		}

		public static double DistancePointToRectBounds(Rect rect, Point p, double min = 9999999.0, bool firstReturn = false)
		{
			Point[] array = new Point[4];
			int num = 0;
			float left = rect.Left;
			float top = rect.Top;
			array[num] = new Point(ref left, ref top);
			int num2 = 1;
			float right = rect.Right;
			float top2 = rect.Top;
			array[num2] = new Point(ref right, ref top2);
			int num3 = 2;
			float right2 = rect.Right;
			float bottom = rect.Bottom;
			array[num3] = new Point(ref right2, ref bottom);
			int num4 = 3;
			float left2 = rect.Left;
			float bottom2 = rect.Bottom;
			array[num4] = new Point(ref left2, ref bottom2);
			return GraphicsToolkit.DistancePointToPolygonBound(array, p, min, firstReturn);
		}

		public static bool PointOnRectangleBounds(Rect rect, Point p, float borderWidth = 1f, double min = 9999999.0)
		{
			rect.Inflate(borderWidth, borderWidth);
			return rect.Contains(p) && GraphicsToolkit.DistancePointToRectBounds(rect, p, min, false) <= (double)borderWidth;
		}

		public static float AngleToArc(float width, float height, float angle)
		{
			return (float)(57.29577951308232 * Math.Atan2(Math.Sin((double)angle * 0.017453292519943295) * (double)height / (double)width, Math.Cos((double)angle * 0.017453292519943295)));
		}

		public static Point PointAtArc(Rect rect, float angle)
		{
			float num = (float)((double)GraphicsToolkit.AngleToArc(rect.Width, rect.Height, angle) * 0.017453292519943295);
			float num2 = rect.Width / 2f;
			float num3 = rect.Height / 2f;
			float num4 = (float)Math.Sin((double)num) * num2;
			float num5 = (float)Math.Cos((double)num) * num3;
			float num6 = rect.X + num2 + num4;
			float num7 = rect.Y + num3 - num5;
			return new Point(ref num6, ref num7);
		}

		public static void FillTriangle(DrawingContext g, float size, Point loc, GraphicsToolkit.TriangleDirection dir = GraphicsToolkit.TriangleDirection.Down)
		{
			CPFPen p = new CPFPen(Color.Black, 1f);
			GraphicsToolkit.FillTriangle(g, size, loc, dir, p);
		}

		public static void FillTriangle(DrawingContext g, float size, Point loc, GraphicsToolkit.TriangleDirection dir, CPFPen p)
		{
			float num = loc.X;
			float num2 = loc.Y;
			switch (dir)
			{
			case GraphicsToolkit.TriangleDirection.Left:
				loc.Y -= size / 2f;
				for (num2 = 0f; num2 < size / 2f; num2 += 1f)
				{
					Stroke stroke = p.Stroke;
					Brush brush = p.Brush;
					float num3 = loc.Y + num2;
					Point point = new Point(ref num, ref num3);
					float num4 = loc.Y + size - num2 - 1f;
					Point point2 = new Point(ref num, ref num4);
					g.DrawLine(stroke, brush, point, point2);
					num -= 1f;
				}
				break;
			case GraphicsToolkit.TriangleDirection.Up:
				loc.X -= size / 2f;
				for (num = 0f; num < size / 2f; num += 1f)
				{
					Stroke stroke = p.Stroke;
					Brush brush2 = p.Brush;
					float num3 = loc.X + num;
					Point point = new Point(ref num3, ref num2);
					float num4 = loc.X + size - num - 1f;
					Point point2 = new Point(ref num4, ref num2);
					g.DrawLine(stroke, brush2, point, point2);
					num2 -= 1f;
				}
				break;
			case GraphicsToolkit.TriangleDirection.Right:
				loc.Y -= size / 2f;
				for (num2 = 0f; num2 < size / 2f; num2 += 1f)
				{
					Stroke stroke = p.Stroke;
					Brush brush3 = p.Brush;
					float num3 = loc.Y + num2;
					Point point = new Point(ref num, ref num3);
					float num4 = loc.Y + size - num2 - 1f;
					Point point2 = new Point(ref num, ref num4);
					g.DrawLine(stroke, brush3, point, point2);
					num += 1f;
				}
				break;
			case GraphicsToolkit.TriangleDirection.Down:
				loc.X -= size / 2f - 1f;
				num2 -= 1f;
				for (num = 0f; num < size / 2f; num += 1f)
				{
					Stroke stroke = p.Stroke;
					Brush brush4 = p.Brush;
					float num3 = loc.X + num;
					Point point = new Point(ref num3, ref num2);
					float num4 = loc.X + size - num;
					Point point2 = new Point(ref num4, ref num2);
					g.DrawLine(stroke, brush4, point, point2);
					num2 += 1f;
				}
				break;
			}
		}

		private const double PIAngleDelta = 0.017453292519943295;

		public enum TriangleDirection
		{
			Left,
			Up,
			Right,
			Down
		}
	}
}