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PODrawing programmatically using C# in Silverlight
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  1. PODrawing programmatically using C# in Silverlight
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    copied!<p>I am trying to create an Aitoff-Hammer grid in Silverlight using C#. It should look like <a href="http://grb.sonoma.edu:81/sl/aitoff.JPG" rel="nofollow noreferrer">this</a> minus the dots and numbers.</p> <p>I am not a programmer but have been able to piece together <a href="http://grb.sonoma.edu:81/sl/TestPage.html" rel="nofollow noreferrer">this</a> using an ActionScript file to do the same thing that was written by my predecessor. As you can see, I get the grid plus unwanted diagonal lines. I am not sure how to avoid having the diagonal lines from being drawn in my code.</p> <p>Any help anyone can provide to fix my problem or point out what I may be doing wrong will be much appreciated. Please let me know if I left out important information. Thanks.</p> <p>Here is my code:</p> <pre><code>PolyLineSegment segment = new PolyLineSegment(); PathFigure figure = new PathFigure(); figure.StartPoint = new Point(xCenter, yCenter); PathGeometry geometry = new PathGeometry(); Path path = new Path(); path.Stroke = new SolidColorBrush(Colors.Black); path.StrokeThickness = 2; aitoff coords = new aitoff(); for (int ra = 0; ra &lt;= 24; ra = ra + 3) { for (int dec = -90; dec &lt;= 90; dec = dec + 3) { points = coords.GetAitoffCoord(ra, dec); double xCoord = xCenter + points.X * width / 2; double yCoord = yCenter + points.Y * height / 2; segment.Points.Add(new Point(xCoord, yCoord)); } } for (int dec = -90; dec &lt;= 90; dec = dec + 30) { for (int ra = 0; ra &lt;= 12; ra = ra + 1) { points = coords.GetAitoffCoord(ra, dec); double xCoord = xCenter + points.X * width / 2; double yCoord = yCenter + points.Y * height / 2; segment.Points.Add(new Point(xCoord, yCoord)); } } for (int dec = -90; dec &lt;= 90; dec = dec + 30) { for (double ra = 12.01; ra &lt;= 25; ra++) { points = coords.GetAitoffCoord(ra, dec); double xCoord = xCenter + points.X * width / 2; double yCoord = yCenter + points.Y * height / 2; segment.Points.Add(new Point(xCoord, yCoord)); } } for (int dec = -90; dec &lt;= 90; dec = dec + 3) { double ra = 12.01; points = coords.GetAitoffCoord(ra, dec); double xCoord = xCenter + points.X * width / 2; double yCoord = yCenter + points.Y * height / 2; segment.Points.Add(new Point(xCoord, yCoord)); } figure.Segments.Add(segment); geometry.Figures.Add(figure); path.Data = geometry; LayoutRoot.Children.Add(path); // GetAitoff public class aitoff { double ra; double dec; Point coords = new Point(); double ra2deg = Math.PI / 180.0f; public Point GetAitoffCoord(double raIn, double decIn) { ra = raIn * 360 / 24; dec = decIn; if (ra &gt; 180) ra = ra - 360; double l = ra * ra2deg; double b = dec * ra2deg; double t = Math.Sqrt(2 / (1 + Math.Cos(b) * Math.Cos(l / 2))); double x = 2 * t * Math.Cos(b) * Math.Sin(l / 2); double y = t * Math.Sin(b); coords.X = x / (-2 * Math.Sqrt(2)); coords.Y = y / (-1 * Math.Sqrt(2)); return coords; } } </code></pre>
 

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