How to fill region between two lines GDI C#

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I want to fill region between two lines in in a c# graphics using c#.

i'm using drawlines method to draw the two curves

C#

points.Add(new PointF(x + left, (float)y + trackHeight));

...

C#

if (points.Count > 1)
    {
      using (Pen pen = HandlerGraphs.GetPen(log.LineStyle, log.Brush, 2))
         {
           gr.DrawLines(pen, points.ToArray());
          }
 }

for fill region, i tried

C#

gr.FillClosedCurve(new SolidBrush(log.leftColorShading), leftPoints.ToArray(), FillMode.Alternate);

[^]

but that take more than two minuts (my curve is composed from 13255 point)

any idea?

Posted 14-Jun-15 4:38am

Member 8727660

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-06-14T10:04:00

Solution 1

No, don't fill closed curve; instead, build and fill the region:
https://msdn.microsoft.com/en-us/library/system.drawing.graphics.fillregion%28v=vs.110%29.aspx[^],
https://msdn.microsoft.com/en-us/library/system.drawing.region%28v=vs.110%29.aspx[^].

—SA

Posted 14-Jun-15 10:04am

Sergey Alexandrovich Kryukov

Comments

Member 8727660 14-Jun-15 17:11pm

how can i use fill region with a list of points?

Sergey Alexandrovich Kryukov 14-Jun-15 22:03pm

Why do you think I gave you the links? To let you read the articles and see further documentation. Did you even try it? Of course, you do it using the second Region constructor using System.Drawing.Drawing2D.GraphicsPath parameter.
Please see: https://msdn.microsoft.com/en-us/library/system.drawing.drawing2d.graphicspath%28v=vs.110%29.aspx,

Please see System.Drawing.Drawing2D.GraphicsPath constructors and all its Add methods. See also
https://msdn.microsoft.com/en-us/library/system.drawing.drawing2d.graphicspath.addpath%28v=vs.110%29.aspx.

Will you accept the answer formally now?

—SA