CODEWITHSUNDEEP
c#winformsgraphicspen
nixn
nixn

Reputation: 1478

C# Pen.DashPattern

I want to draw a Line between 2 rows while using drag and drop. The function of this is simply visual, so that the user knows, where he is dropping the row. The line should look like the excel onces. Here my code:

        Pen _marqueePen = new Pen(Color.Gray, 2);
        float[] dashValues = {1f,1f};
        _marqueePen.DashPattern = dashValues;

But this looks like that

enter image description here

I want to look it like that:

enter image description here

I'm WinForms and the C1 Flexgrid control.

Upvotes: 2

Views: 4977

Answers (3)

Stelios Adamantidis
Stelios Adamantidis

Reputation: 2031

That looks to me more like a rectangle filed with HatchBrush having HatchStyle.Percent50 and height of 3.

You could try

Rectangle rect = new Rectangle(0, 0, 500, 3) //you will use the values here from your cursor but height will be 3
HatchBrush brush = new HatchBrush(HatchStyle.Percent50, Color.Black);
g.FillRectangle(brush, rect);

Upvotes: 0

TaW
TaW

Reputation: 54433

You can use a Custom Pen like this:

using (Pen pen = new Pen(Color.Gray, 4f) )
{
    pen.DashStyle = System.Drawing.Drawing2D.DashStyle.Custom;
    pen.DashPattern = new float[] { 0.25F, 0.25F };
    // now draw your stuff.. 
}

Note the doc on MSDN:

The elements in the dashArray array set the length of each dash 
and space in the dash pattern. The first element sets the length of a dash, 
the second element sets the length of a space, the third element sets 
the length of a dash, and so on. Consequently, each element should be a 
non-zero positive number.

The length of each dash and space in the dash pattern is the product 
of the element value in the array and the width of the Pen.

You can pick any pen width and any dash&gap lengths as long as you keep their relation in mind.. So if you want the finest dashes, make sure they multiply to 1.0 pixels!

Here is the resulting line:

fine dashed line

Upvotes: 5

Yves Schelpe
Yves Schelpe

Reputation: 3463

Some options:

  • You could use a PNG graphic that mimics that excel behaviour and then draw it on the control (you'll have to tile your image vertically).
  • Draw three lines with your code, with offset of y-axis & x-axis one pixel.

Upvotes: 1

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