/GammaJul.LgLcd/LcdGdiPolygon.cs

using System;

using System.Drawing;

using System.Drawing.Drawing2D;



namespace GammaJul.LgLcd {



	/// <summary>

	/// Represents a polygon on a <see cref="LcdGdiPage"/>.

	/// </summary>

	public class LcdGdiPolygon : LcdGdiAbsObject {

		private FillMode _fillMode;



		/// <summary>

		/// Gets or sets a member of the <see cref="FillMode"/> enumeration that determines how the polygon is filled.

		/// </summary>

		public FillMode FillMode {

			get { return _fillMode; }

			set {

				if (_fillMode != value) {

					_fillMode = value;

					HasChanged = true;

				}

			}

		}



		/// <summary>

		/// Changes the points of the polygon.

		/// </summary>

		/// <param name="points">Points delimiting the polygon.</param>

		/// <param name="keepAbsolute">Whether the given points are left untouched.

		/// <see cref="LcdGdiAbsObject.KeepAbsolute"/> for details.</param>

		public void SetPoints(PointF[] points, bool keepAbsolute) {

			if (points == null)

				throw new ArgumentNullException("points");

			if (points.Length < 3)

				throw new ArgumentOutOfRangeException("points", "There must be at least 3 points to make a polygon.");

			CalcAndSetPoints(points, keepAbsolute);

		}





		/// <summary>

		/// Draws the polygon.

		/// </summary>

		/// <param name="page">Page where this object will be drawn.</param>

		/// <param name="graphics"><see cref="Graphics"/> to use for drawing.</param>

		protected internal override void Draw(LcdGdiPage page, Graphics graphics) {

			PointF[] points = GetPoints();

			for (int i = 0; i < points.Length; ++i) {

				PointF point = points[i];

				point.X += AbsolutePosition.X;

				point.Y += AbsolutePosition.Y;

				points[i] = point;

			}

			if (Brush != null)

				graphics.FillPolygon(Brush, points, _fillMode);

			if (Pen != null)

				graphics.DrawPolygon(Pen, points);

		}





		/// <summary>

		/// Creates a new <see cref="LcdGdiPolygon"/>.

		/// </summary>

		public LcdGdiPolygon()

			: base(new PointF[3], false) {

		}



		/// <summary>

		/// Creates a new <see cref="LcdGdiPolygon"/> with the specified pen for the edge and points.

		/// </summary>

		/// <param name="pen">Pen used to draw the edge of the polygon.</param>

		/// <param name="points">Points delimiting the polygon.</param>

		/// <param name="keepAbsolute">Whether the given points are left untouched.

		/// <see cref="LcdGdiAbsObject.KeepAbsolute"/> for details.</param>

		public LcdGdiPolygon(Pen pen, PointF[] points, bool keepAbsolute)

			: this(pen, null, points, keepAbsolute) {

		}



		/// <summary>

		/// Creates a new <see cref="LcdGdiPolygon"/> with the specified brush for the fill and points.

		/// </summary>

		/// <param name="brush">Brush used to fill the polygon.</param>

		/// <param name="points">Points delimiting the polygon.</param>

		/// <param name="keepAbsolute">Whether the given points are left untouched.

		/// <see cref="LcdGdiAbsObject.KeepAbsolute"/> for details.</param>

		public LcdGdiPolygon(Brush brush, PointF[] points, bool keepAbsolute)

			: this(null, brush, points, keepAbsolute) {

		}



		/// <summary>

		/// Creates a new <see cref="LcdGdiPolygon"/> with the specified pen for the edge,

		/// brush for the fill and points.

		/// </summary>

		/// <param name="pen">Pen used to draw the edge of the polygon.</param>

		/// <param name="brush">Brush used to fill the polygon.</param>

		/// <param name="points">Points delimiting the polygon.</param>

		/// <param name="keepAbsolute">Whether the given points are left untouched.

		/// <see cref="LcdGdiAbsObject.KeepAbsolute"/> for details.</param>

		public LcdGdiPolygon(Pen pen, Brush brush, PointF[] points, bool keepAbsolute)

			: base(points, keepAbsolute) {

			if (points.Length < 3)

				throw new ArgumentOutOfRangeException("points", "There must be at least 3 points to make a curve.");

			Pen = pen;

			Brush = brush;

		}

	}



}