bitmap image zoom in or out

[richjoh]

Hi Folks,

I need to zoom in or out on a bitmap image. The image is a picture of a plot. I was wondering, what is the easiest way of showing a zoom in or out. I'm not allowed to use an xy plot or other plots, the bitmap provided needs to be redrawn so its xy scale changes accordingly.

Any ideas?

[chilly_charly]

Obvioulsly you have to display the image somewhere, probably using a picture control ? There is a zoom property node of the picture control that you can use to change the scale programmaticaly : right click the terminal on the diagram, then select create > property node > zoom factor.

Otherwise, you'll have to convert your image to a 2D array, then use a for loop and Decimate a1D array to zoom out or Interleave 1D array to zoom in 

[Little Nemo]

I wrote a VI that computes a bicubic spline interpolation over both axes (x-y), which enables you to zoom in and out with any aspect ratio. Make sure that you've got the lvanlys.dll in your LabView path: \National Instruments\LabVIEW 7.1\resource\. Otherwise you can find this dll attached to this thread (just in case).

Hope that helps ...