Slowdown when putting symbols into image data
J. Landman Gay
jacque at hyperactivesw.com
Wed Sep 10 00:27:08 CEST 2014
I should warn you though about the issue I had. If you use an image as a
marker it will tile across the whole graphic; that is, each marker is
not drawn individually, it is as though the whole card had that pattern
and each marker picks up only the portion of the fill pattern that would
be under that spot. So if you can create the symbols using markerpoints
instead of images, it works better. Basically that's what the list
helped me with.
Here's the thread on Nabble:
If you scroll down to Bernd's post (user name BNig), he provides a link
to his very cool MakeMarker utility that will help you create the
markers you need. He and Jacques Hausser's circle points saved me.
On 9/9/2014, 5:13 PM, William Prothero wrote:
> I didn’t know that markers could be applied to the points on a line. I see now, very cool. I’ll take that approach. I can see in the object inspector where to make up the markers. Looks straightforward.
> Thanks again,
> On Sep 9, 2014, at 2:50 PM, J. Landman Gay <jacque at hyperactivesw.com> wrote:
>> On 9/9/2014, 4:28 PM, William Prothero wrote:
>>> Jacqueline: Sounds like a good idea. I don’t see how, though, that
>>> you would be able to display a LOT of identical symbols on a map
>>> using a single polygon graphic. Don’t you have to create and place
>>> each one? That would mean thousands of graphic objects. Is that what
>>> you mean?
>> Oh no, not at all. Not having thousands of objects is exactly the reason to choose graphic objects.
>> Every point on a graphic can display a marker which is just a small image you provide. If you set the linesize of the graphic to 0, the lines don't show, all you see are the markers. Then you just make a list of the locations, one per point, one point per line, and set the graphic's points property to that list.
>> The graphic can cover as much area as you need, it can sprawl all over the card. All you see are the points, and each point is a symbol image. The only restriction is that a graphic can only show one type of marker, so you'll need a different graphic for each symbol image you want to display. In my case, I had five symbols, so I needed five graphics. But each graphic had hundreds of points.
>> Jacqueline Landman Gay | jacque at hyperactivesw.com
>> HyperActive Software | http://www.hyperactivesw.com
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Jacqueline Landman Gay | jacque at hyperactivesw.com
HyperActive Software | http://www.hyperactivesw.com
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