/GammaJul.LgLcd/LcdGdiPolygon.cs

  1using System;
  2using System.Drawing;
  3using System.Drawing.Drawing2D;
  4
  5namespace GammaJul.LgLcd {
  6
  7	/// <summary>
  8	/// Represents a polygon on a <see cref="LcdGdiPage"/>.
  9	/// </summary>
 10	public class LcdGdiPolygon : LcdGdiAbsObject {
 11		private FillMode _fillMode;
 12
 13		/// <summary>
 14		/// Gets or sets a member of the <see cref="FillMode"/> enumeration that determines how the polygon is filled.
 15		/// </summary>
 16		public FillMode FillMode {
 17			get { return _fillMode; }
 18			set {
 19				if (_fillMode != value) {
 20					_fillMode = value;
 21					HasChanged = true;
 22				}
 23			}
 24		}
 25
 26		/// <summary>
 27		/// Changes the points of the polygon.
 28		/// </summary>
 29		/// <param name="points">Points delimiting the polygon.</param>
 30		/// <param name="keepAbsolute">Whether the given points are left untouched.
 31		/// <see cref="LcdGdiAbsObject.KeepAbsolute"/> for details.</param>
 32		public void SetPoints(PointF[] points, bool keepAbsolute) {
 33			if (points == null)
 34				throw new ArgumentNullException("points");
 35			if (points.Length < 3)
 36				throw new ArgumentOutOfRangeException("points", "There must be at least 3 points to make a polygon.");
 37			CalcAndSetPoints(points, keepAbsolute);
 38		}
 39
 40
 41		/// <summary>
 42		/// Draws the polygon.
 43		/// </summary>
 44		/// <param name="page">Page where this object will be drawn.</param>
 45		/// <param name="graphics"><see cref="Graphics"/> to use for drawing.</param>
 46		protected internal override void Draw(LcdGdiPage page, Graphics graphics) {
 47			PointF[] points = GetPoints();
 48			for (int i = 0; i < points.Length; ++i) {
 49				PointF point = points[i];
 50				point.X += AbsolutePosition.X;
 51				point.Y += AbsolutePosition.Y;
 52				points[i] = point;
 53			}
 54			if (Brush != null)
 55				graphics.FillPolygon(Brush, points, _fillMode);
 56			if (Pen != null)
 57				graphics.DrawPolygon(Pen, points);
 58		}
 59
 60
 61		/// <summary>
 62		/// Creates a new <see cref="LcdGdiPolygon"/>.
 63		/// </summary>
 64		public LcdGdiPolygon()
 65			: base(new PointF[3], false) {
 66		}
 67
 68		/// <summary>
 69		/// Creates a new <see cref="LcdGdiPolygon"/> with the specified pen for the edge and points.
 70		/// </summary>
 71		/// <param name="pen">Pen used to draw the edge of the polygon.</param>
 72		/// <param name="points">Points delimiting the polygon.</param>
 73		/// <param name="keepAbsolute">Whether the given points are left untouched.
 74		/// <see cref="LcdGdiAbsObject.KeepAbsolute"/> for details.</param>
 75		public LcdGdiPolygon(Pen pen, PointF[] points, bool keepAbsolute)
 76			: this(pen, null, points, keepAbsolute) {
 77		}
 78
 79		/// <summary>
 80		/// Creates a new <see cref="LcdGdiPolygon"/> with the specified brush for the fill and points.
 81		/// </summary>
 82		/// <param name="brush">Brush used to fill the polygon.</param>
 83		/// <param name="points">Points delimiting the polygon.</param>
 84		/// <param name="keepAbsolute">Whether the given points are left untouched.
 85		/// <see cref="LcdGdiAbsObject.KeepAbsolute"/> for details.</param>
 86		public LcdGdiPolygon(Brush brush, PointF[] points, bool keepAbsolute)
 87			: this(null, brush, points, keepAbsolute) {
 88		}
 89
 90		/// <summary>
 91		/// Creates a new <see cref="LcdGdiPolygon"/> with the specified pen for the edge,
 92		/// brush for the fill and points.
 93		/// </summary>
 94		/// <param name="pen">Pen used to draw the edge of the polygon.</param>
 95		/// <param name="brush">Brush used to fill the polygon.</param>
 96		/// <param name="points">Points delimiting the polygon.</param>
 97		/// <param name="keepAbsolute">Whether the given points are left untouched.
 98		/// <see cref="LcdGdiAbsObject.KeepAbsolute"/> for details.</param>
 99		public LcdGdiPolygon(Pen pen, Brush brush, PointF[] points, bool keepAbsolute)
100			: base(points, keepAbsolute) {
101			if (points.Length < 3)
102				throw new ArgumentOutOfRangeException("points", "There must be at least 3 points to make a curve.");
103			Pen = pen;
104			Brush = brush;
105		}
106	}
107
108}