Zoom in/out

[hsteiner]

Hi,

I'm using a picture box/image box combination with vertical and horizontal scroll bars for opening and scrolling through a bitmap. I use the picture box and a mousedown event for digitizing coordinates. Problems are coming up when I want to zoom into a bitmap. The scrollbars have a limitted size and when the bitmap becomes too wide/height, I can't scroll any further. Any suggestions for zooming in/out and keeping the internal coordinate system for a mousedown event ??

Harry

[/\/\isanThr0p]

I think you would need to change the max or min value on the scrollbars according to your zoom factor, but I really don't know how you programmed it so I can't know.

keeping the system could be archieved by getting the offset (scrollbar.value) multiplying this value with the zoomfactor (or not depending on how you managed that before) + the x or y value you get from the mouse down event and depending on what you really want to archieve taking this times the zoomfactor too.

hope that was any clear

[Mad Compie]

Just show the visible surface of the zoomed image instead of the whole zoomed image, you will also save a lot of memory resources!

[ma2trmod]

I have the same proble but i don't know how can i make zoom to a zone of the picture loaded in a picturebox control. Haw can i do that, please?



Originally posted by /\/\isanThr0p
I think you would need to change the max or min value on the scrollbars according to your zoom factor, but I really don't know how you programmed it so I can't know.

keeping the system could be archieved by getting the offset (scrollbar.value) multiplying this value with the zoomfactor (or not depending on how you managed that before) + the x or y value you get from the mouse down event and depending on what you really want to archieve taking this times the zoomfactor too.

hope that was any clear

[/\/\isanThr0p]

hm I am sorry, but I don't understand your question.

[Mad Compie]

Simple: using PaintPicture or BitBlt/StretchBlt