/Rendering/Basics/Drawing/Rect.cs

  1using Delta.Utilities.Datatypes;
  2
  3namespace Delta.Rendering.Basics.Drawing
  4{
  5	/// <summary>
  6	/// Draw 2D rectangles with help of this class. They can be drawn as only
  7	/// outline, filled shape and with rotation. This has the advantage of
  8	/// optimizing it better.
  9	/// </summary>
 10	public static class Rect
 11	{
 12		#region Constants
 13		/// <summary>
 14		/// Helper for the Rectangle method that allows rotated rectangle drawing.
 15		/// </summary>
 16		private static readonly Point[] rotatedEdgePoints = new Point[4];
 17		#endregion
 18
 19		#region DrawOutline (Static)
 20		/// <summary>
 21		/// Draws a rectangle box with lines
 22		/// </summary>
 23		/// <param name="rect">Rectangle to draw</param>
 24		/// <param name="lineColor">Line color</param>
 25		public static void DrawOutline(Rectangle rect, Color lineColor)
 26		{
 27			// Skip if the drawArea is certainly outside of the quadratic space.
 28			// Checking the screen area would work too, but is a little slower and
 29			// won't exclude much more anyway.
 30			if (rect.Left >= 1.0f ||
 31			    rect.Top >= 1.0f ||
 32			    rect.Left < -rect.Width ||
 33			    rect.Top < -rect.Height)
 34			{
 35				// Skip this material rendering, not visible this frame.
 36				return;
 37			}
 38
 39			DrawManager drawInstance = DrawManager.Instance;
 40			Point topRight = rect.TopRight;
 41			Point bottomRight = rect.BottomRight;
 42			Point bottomLeft = rect.BottomLeft;
 43			drawInstance.Draw2DLine(ref rect.TopLeft, ref topRight, ref lineColor);
 44			drawInstance.Draw2DLine(ref topRight, ref bottomRight, ref lineColor);
 45			drawInstance.Draw2DLine(ref bottomRight, ref bottomLeft, ref lineColor);
 46			drawInstance.Draw2DLine(ref bottomLeft, ref rect.TopLeft, ref lineColor);
 47		}
 48
 49		/// <summary>
 50		/// Draws a rotated rectangle box with lines.
 51		/// </summary>
 52		/// <param name="rect">Rectangle to draw</param>
 53		/// <param name="lineColor">Line color</param>
 54		/// <param name="rotation">Rotation of the rectangle</param>
 55		public static void DrawOutline(Rectangle rect, Color lineColor,
 56			float rotation)
 57		{
 58			// Skip if the drawArea is certainly outside of the quadratic space.
 59			// Checking the screen area would work too, but is a little slower and
 60			// won't exclude much more anyway.
 61			if (rect.Left >= 1.0f ||
 62			    rect.Top >= 1.0f ||
 63			    rect.Left < -rect.Width ||
 64			    rect.Top < -rect.Height)
 65			{
 66				// Skip this material rendering, not visible this frame.
 67				return;
 68			}
 69
 70			// Rotate the original rectangle
 71			rect.Rotate(rotation, rotatedEdgePoints);
 72			// And draw it out same way as above: top left, right, bottom right, left
 73			DrawManager drawInstance = DrawManager.Instance;
 74			drawInstance.Draw2DLine(ref rotatedEdgePoints[0],
 75				ref rotatedEdgePoints[1], ref lineColor);
 76			drawInstance.Draw2DLine(ref rotatedEdgePoints[1],
 77				ref rotatedEdgePoints[2], ref lineColor);
 78			drawInstance.Draw2DLine(ref rotatedEdgePoints[2],
 79				ref rotatedEdgePoints[3], ref lineColor);
 80			drawInstance.Draw2DLine(ref rotatedEdgePoints[3],
 81				ref rotatedEdgePoints[0], ref lineColor);
 82		}
 83		#endregion
 84
 85		#region DrawFilled (Static)
 86		/// <summary>
 87		/// Draw filled rectangle at the given position with the given color.
 88		/// </summary>
 89		/// <param name="rect">The rect.</param>
 90		/// <param name="color">The color.</param>
 91		public static void DrawFilled(Rectangle rect, Color color)
 92		{
 93			// Skip if the drawArea is certainly outside of the quadratic space.
 94			// Checking the screen area would work too, but is a little slower and
 95			// won't exclude much more anyway.
 96			if (rect.Left >= 1.0f ||
 97			    rect.Top >= 1.0f ||
 98			    rect.Left < -rect.Width ||
 99			    rect.Top < -rect.Height)
100			{
101				// Skip this material rendering, not visible this frame.
102				return;
103			}
104
105			// A rectangle is just 2 polygons
106			DrawManager drawInstance = DrawManager.Instance;
107			Point bottomRight = rect.BottomRight;
108			Point topRight = rect.TopRight;
109			Point bottomLeft = rect.BottomLeft;
110			drawInstance.DrawPolygon(ref rect.TopLeft, ref bottomRight,
111				ref topRight, ref color);
112			drawInstance.DrawPolygon(ref rect.TopLeft, ref bottomLeft,
113				ref bottomRight, ref color);
114		}
115
116		/// <summary>
117		/// Draw filled rectangle at the given position with the given color.
118		/// </summary>
119		/// <param name="rect">The rect.</param>
120		/// <param name="color">The color.</param>
121		/// <param name="rotation">The rotation.</param>
122		public static void DrawFilled(Rectangle rect, Color color,
123			float rotation)
124		{
125			// Skip if the drawArea is certainly outside of the quadratic space.
126			// Checking the screen area would work too, but is a little slower and
127			// won't exclude much more anyway.
128			if (rect.Left >= 1.0f ||
129			    rect.Top >= 1.0f ||
130			    rect.Left < -rect.Width ||
131			    rect.Top < -rect.Height)
132			{
133				// Skip this material rendering, not visible this frame.
134				return;
135			}
136
137			// A rectangle is 2 polygons, but rotate the original rectangle first
138			rect.Rotate(rotation, rotatedEdgePoints);
139			// And draw it out same way as above
140			DrawManager drawInstance = DrawManager.Instance;
141			drawInstance.DrawPolygon(ref rotatedEdgePoints[0],
142				ref rotatedEdgePoints[2], ref rotatedEdgePoints[1], ref color);
143			drawInstance.DrawPolygon(ref rotatedEdgePoints[0],
144				ref rotatedEdgePoints[3], ref rotatedEdgePoints[2], ref color);
145		}
146		#endregion
147	}
148}