Re: Draw Rectangle directly to client (ie - without bitmap?)

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I'm an idiot - I was calling seat.Clear earlier in the code - that fixed it.
What a dummy.

Thanks,

"NathanC" wrote:

I'll look into that - here is my code:

Dim i As Int32
For i = 0 To dvGetSeatsByScreen.Count - 1

dvGetSeatStatus.RowFilter = "id='" &
dsGetSeatsByScreen.Tables("Table").Rows(i).Item("seat_status").ToString() &
"'"
fore_color = dvGetSeatStatus(0)("fore_color").ToString()
back_color = dvGetSeatStatus(0)("back_color").ToString()
status_legend = dvGetSeatStatus(0)("status_legend").ToString()

fore_color = Drawing.Color.FromArgb(fore_color)
back_color = Drawing.Color.FromArgb(back_color)

xpos =
Convert.ToInt32(dsGetSeatsByScreen.Tables("Table").Rows(i).Item("xpos").ToString())
ypos =
Convert.ToInt32(dsGetSeatsByScreen.Tables("Table").Rows(i).Item("xpos").ToString())

seat.DrawRectangle(Drawing.Pens.Black, xpos, ypos, 5, 10)
seat.FillRectangle(Drawing.Brushes.Crimson, xpos, ypos, 5, 10)

Next

Response.ContentType = "image/gif"
bitmap.Save("C:\Inetpub\wwwroot\Tessitura\images\" &
ViewSelection.SelectedItem.Text & ".gif", Drawing.Imaging.ImageFormat.Gif)

"Bob Powell [MVP]" wrote:

I'm assuming that your drawing to the screen and your stuff is disappearing
between draw cycles.

Are you respecting the laws of GetGraphics? (See the GDI+ FAQ)

Perhaps you should draw your rectangles to an image in memory and then
display that instead.

--
--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

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"NathanC" <NathanC@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:E9B4D871-5909-476F-9D90-42E78DFA4570@xxxxxxxxxxxxxxxx
I am trying to draw a rectangle for every record in a dataset.
The drawing function will occur within a For Each loop and each record has
a
different XY position, so the idea is that the final result will have a
single image with multiple rectangles. I have tried using bitmap
methodology
of doing this, but that doesn't get multiple objects on the image - only
the
final item is saved and displayed.

Is there a way that I can draw the rectangle directly to the client, and
then next iteration through the loop, draw a different rectangle in a new
location without losing the last image?

Thanks,


.

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