Drawing on a panel

[NetStorm]

Hey,

I have loaded a file of coordinates in to my app and drawn it on to a panel. It has drawn it to the top left corner and is rather small in conjunnction with the coordinates.

Is there a way I can zoom to fit the drawing on the panel, so that the drawing is larger than the coordinates make it, basically a zoom to fit?

Thanks for any help. Much appreciated.

Regards,

Dan.

 

[klaus]

You must be more precise.
The panel coordinates are pixels, the upper left corner's coordinates are 0, 0.
What kind of coordinates are you speeking of ?
What are the min, max values of the coordinates ?
What is the size of the panel ?

Best regards.

 

[NetStorm]

The min max values vary depending on the file but are readable. The coordiantes are from a DXF autocad file.

 

[klaus]

You will need to calculate two scaling factors and two offset values for the panel to convert the physical coordinates to panel coordinates.

Best regards.

 

[NetStorm]

Not sure I follow any chance of an example?

 

[kickaha]

Simplistically to fill the panel:

Get your maximum x coord value - call this MaxX
Get your maximum y coord value - call this MaxY

Get the panel Width (its x value) - call this DisplayX
Get the panel height (its y value) - call this DisplayY

ScaleX = DisplayX / MaxX
ScaleY = DisplayY / MaxY

then scale each coordinate pair with x*ScaleX, y*ScaleY

To maintain aspect ratio you can use

If ScaleX > ScaleY Then

ScaleX = ScaleY

Else

ScaleY = ScaleX 

End If

 

[eps]

The min max values vary depending on the file but are readable. The coordiantes are from a DXF autocad file.

AutoCAD you say? _very_ interesting!!

 

[klaus]

@NetStorm,
Could you post an example coordinate file ?
And your test project as a zip file.

Would be much easier to help you.

Best regards.

 

[klaus]

Attached you find a small test program that shows you how to do it.

Best regards.

 

[NetStorm]

Thanks alot! Still doesn't seem to fill he panel but is bigger than it was. I'll keep working at it, see if I can make it work.

 

[klaus]

As already suggested, post your project with a coordinate file and I will have a look at it.

Best regards.