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 ImageEn Library for Delphi, C++ and .Net
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 Selection, Zoom and ViewXY		  New Topic  Reply to Topic
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BionicWave

Germany
33 Posts
Posted - Feb 18 2012 :  16:19:33  Show Profile  Reply
I looked at the online-help but could not find the right property for my problem.

When i zoom into a picture and move a selection, i want to adjust the ViewX and ViewY, so that the selection stays visible.

This is easy to do for SelX1 and ViewX, because i can calculate when selection is smaller then SelX1.

Now i would like to move the view to the right whenever the selection SelX2 is bigger than the visible window.

How can i calculate this?

BionicWave

Germany
33 Posts
Posted - Feb 18 2012 :  17:30:29  Show Profile  Reply
I think i found the solution.
I have to calculate the borders of the view by doing:

ViewLeft := trunc(imgen.viewX * (100 / img.zoom));
ViewRight := trunc( ImageEn.Clientwidth * (100 / img.zoom));

Then i can calculate if a given point is inside the viewable zoomed area.
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