[OpenLayers-Users] offset polygon

[Stephen Woodbridge]

Steve,

I'm a little rusty on my OL js, but it looks most geometry objects have 
a resize() method. If you have an object and you want to make another 
that is larger or smaller, then clone() it and resize() the clone.

I have not tried this, just guessing at the moment. Maybe one of the 
devs can comment on this.

-Steve

On 5/4/2012 3:48 PM, Steve Nelson wrote:
> I see what you mean. For this project, true offset isn't important.
> Resizing is perfect. Is there a built in function for resizing?
>
> Steve
>
> On Fri, May 4, 2012 at 2:10 PM, Stephen Woodbridge
> <woodbri at swoodbridge.com <mailto:woodbri at swoodbridge.com>> wrote:
>
>     On 5/4/2012 11:26 AM, Steve Nelson wrote:
>
>         Does anyone have a function that can create an offset polygon?
>
>         In other words, if I have a polygon made up of 5 points have the
>         same
>         polygon shape, just a larger size?
>
>
>     Hi Steve,
>
>     These are not the same thing.
>
>     If you want the same shape only larger then you are looking a scale.
>     If you want and offset, this is MUCH more complicated because you
>     have to deal with changes in topology, like if you have a small V
>     shape then you offset might cause these to be removed like:
>
>     ----------------- offset
>
>     ------\  /------- curve
>            \/
>
>     or if your polygon has a hole then an offset could result in a
>     smaller hole or with the hole getting filled in and removed. There
>     are many cases like this. These are just a couple of examples to
>     give you the idea.
>
>     So what DO you need? Resizing via scale is easy, True offset is hard!
>
>     -Steve W
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