ZoomPictureBox: picture control with mouse-centred zooming

[boops boops]

Hi jfrazier, welcome to the forums.

You can code the Click event subs of the buttons to change the ZoomFactor property. You could add/subtract to the present zoom factor or multiply/divide it; that's a matter of your own design. Alternatively you could use a number of buttons each to set a specific value of the ZoomFactor (1 means original image size). As an example, suppose you add a "Zoom In" button to the form. Then double click the button and put this in its Click event sub (assuming the ZoomPictureBox is named zpb1):

zpb1.ZoomFactor * = 1.25

And you could put something similar but with a factor of say 0.75 in the "Zoom Out" button's Click sub.

The scroll wheel zooming will still work as long as you don't change EnableMouseWheelZooming to False. If you are using ZoomMode "zoom to mouse position", that might look a little odd when you click a button to zoom. But it's easy to change the mode to CenterControl temporarily in the button's Click sub, for example:

	zpb1.ZoomMode = ZPBLibrary.ZoomPictureBox.ZoomType.ControlCenter
	zpb1.ZoomFactor *= 1.25
	zpb1.ZoomMode = ZPBLibrary.ZoomPictureBox.ZoomType.MousePosition

BB

[jfrazier]

Thank you. That was much more simple than what I was trying unsuccesfully to do. I was turning off the mouse control and then turning it back on, or at least that was what I was trying to do. It wasn't working in the least, but this works like a charm.

Many thanks from a .Net Newbie

[jfrazier]

I am trying to add zoom features to my program and I am doing a fit to width and fit to height click options. I am getting the size working, but I am having no luck on moving the picture within the zoompicturebox on just the click. I am attempting to get it to the upper left corner. My research is showing that the picturebox would use sizemode, but as I am not inheriting from picturebox it is not present with zoompicturebox. So far I have not found a combination that does what I am trying to do. Any ideas?

Thank you,
newbie

[boops boops]

Try this:

ZoomPictureBox1.ImageLocation = Point.Empty

Point.Empty is the same as Point(0,0). With a little bit of arithmetic with the widths and heights you should be able to work out how to centre the image if you need to.

BB