HOW TO: Translate Bitmap and Client Coordinates When UseDpi = true and Draw With GDI+

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#1 Posted : Wednesday, May 21, 2008 6:40:52 AM(UTC)

GregR

Groups: Registered, Tech Support, Administrators
Posts: 764

When using RasterImageViewer.UseDpi = true, converting to and from bitmap and client coordinates can be difficult since the conversion LEADTOOLS does when painting is completely internal. You must take an additional step in your coordinate conversions on top of what the Leadtools.Transformer class does for you. I've attached a .NET 2.0 C# LEADTOOLS v15 example that shows how to:

1. Properly convert from client to bitmap coordinates when UseDpi = true
2. Capture mouse events and draw lines on the image using the System.Drawing.Graphics class

File Attachment(s):

NET - v15 - UseDpi GDI Drawing.zip (16kb) downloaded 213 time(s).


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#2 Posted : Monday, June 25, 2012 4:08:15 AM(UTC)

Ibrahim

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Posts: 3,022

Was thanked: 2 time(s) in 2 post(s)

I've updated this project to use the LEADTOOLS v17.5 in C# using Visual Studio 2008.

Note: In the code, you should change the path of the image in the codecs.Load() method, or set the working directory of the project to the path of the image.

File Attachment(s):

CS_v175_UseDpi_GDI_Drawing.zip (13kb) downloaded 214 time(s).

#3 Posted : Thursday, July 12, 2012 6:18:01 AM(UTC)

Daoud

Groups: Registered
Posts: 256

I've updated this project to use VB.NET with LEADTOOLS v17.5 in MS-VS2008.

File Attachment(s):

VB_v175_UseDpi_GDI.zip (11kb) downloaded 215 time(s).

#4 Posted : Friday, February 17, 2017 4:46:50 PM(UTC)

Joe Z

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Posts: 63

Thanks: 2 times
Was thanked: 4 time(s) in 4 post(s)

I have updated this project to work with LEADTOOLS v19 using C# and Visual Studio 2015.

File Attachment(s):

CS_V19_UseDpi_GDI_Drawing.zip (12kb) downloaded 186 time(s).

Edited by moderator Tuesday, March 21, 2017 10:53:59 AM(UTC) | Reason: Not specified

Joe Zhan
Developer Support Engineer
LEAD Technologies, Inc.

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