Thanks for the help. I changed my implementation of panning to be from screen to world coordinates and it works perfectly. I tried to use the built in panning with shift+left click and it works terribly for me, but my version works perfectly.<div>
<br></div><div>Thanks again for the help<br><br><div class="gmail_quote">On Thu, Oct 14, 2010 at 7:08 PM, Jim Peterson <span dir="ltr"><<a href="mailto:jimcp@cox.net">jimcp@cox.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="im">Jonathan Morra wrote:<br>
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Where lastPoint[] is the last point that the mouse was at, and the startPoint(e) method updates the lastPoint array. This code does pan the image in the direction that the mouse moves, however the amount that is panned per mouse movement is wrong, and it seems to be affected by the image zoom (ie an image that is zoomed in very far pans too fast and an image that is zoomed way out pans too slowly). Does anyone have any idea why this is or how to fix it. My guess is that I have to multiply the xChange and yChange by some scale factor that's a function of the zoom, but I can't seem to figure it out.<br>
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I think you have the problem, you are using screen coordinates to modify world coordinates. when you are viewing a large scale object (zoomed out) the screen coordinates may be insignificant compared to the world coordinates, when zoomed in, they are very large. you might be able to factor the adjustment of the camera and focal point to the distance between camera position and focal point (call that camera distance) to come up with a reasonable metric, maybe equate this screen width in pixels to camera distance in world units.<br>
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Also, you are assuming your views are always perpendicular to a coordinate plane, are you allowing scene rotation? if so, your view plane may not be parallel to one of the coordinate planes.<br>
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Just a curiosity, when I hold the shift key down, my window interactor goes into pan mode. If you need something different then that, maybe looking at the existing interactor for an example of panning.<br>
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HTH,<br><font color="#888888">
Jim<br>
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