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POAnimating from a point other than the left side
 

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    <p>I have an animation problem that I'm not sure how to Google or find a solution for. I'm trying to basically create a wrapping Marquee. I do this by having the following within a canvas:</p> <p>|---Section A---|---Section B---|Section C---|</p> <p>The animation begins with the left side of section B on the right side of the screen, and ends when the right side of section B hits the left side of the screen. Sections A and C are a mirror image of Section B, which creates the "wrap around" effect. When the animation ends, I move everything to the right the exact width of Section B. To the user, nothing appears to have happened .. it's all just wrapping around. </p> <p>The problem is this ... some of the items in the marquee can be hidden, or can change size. So if you hide an item, the item is hidden from all three sections. Since things are being hidden in Section A, and all the sections are sized dynamically, the entire marquee moves to the left. </p> <p>Is there any way to "anchor" the animation at a spot, say, in the middle of Section B, so that when items are hidden in section A, it doesn't slide sections B and C over? Instead, I want Section A to move right to fill in the space. </p> <p>Edit: Let me rephrase ... because this is confusing. </p> <p>I have a canvas, which contains a stackpanel, which contains three more stack panels. These three stack panels are actually copies of the same information, which gives the illusion of a marquee that wraps around when I animate. When items are added/removed in the marquee, those items in the stack panel change, which adjusts the overall size of the stack panel, which adjusts the size of the canvas. What I'd like to know, is if I can "anchor" a specific location within the stackpanel. Can I "anchor" on the first item in the 2nd stackpanel copy? </p>
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