ZoomIn and ZoomOut functions for custom user control(Map) containing gdi geometries

Chandan Rath

I need to write a code for zoomin, zoomout and pan functions. I have made a usercontrol(Map) to show geometries of a shapefile using GDI technique. Now I need to add some common map functions such as ZoomIn, ZoomOut, FitView and pan etc.

Is there any methods in GDI+ to do such operations?

Anybody, Please Help...

Thanks in advance.

3 Replies

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Frogleg14y ago
Without seeing any code I can't help you
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Chandan Rath14y ago
I am not showing an image in a picturebox. My requrement is very similar to common functions of a map control like in google earth, there are controls like Zoom, Pan, FitView, etc. I have made a usercontrol which contains methods to draw geometries like lines and polygons. Now I want to add those common functions(zoom, pan, etc.) to the usercontrol.
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Frogleg14y ago
If you are using windows forms, the easiest way is to:
1: Put a panel on your form, and set it's autoscroll properties to true
2: Put a picturebox inside that panel - sizemode autosize.
3: You need to get a ratio of width and height, so that when you zoom in, you keep the aspect ratio.
Before zooming, the picturebox sizemode needs to be set to stretchimage.
When you want to zoom in, increase the size of the picturebox and the parent panel will then display scroll bars as required
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