#1023 closed defect (fixed)
Low perfomace while generating legend
| Reported by: | liuar | Owned by: | Arthur Liu |
|---|---|---|---|
| Priority: | medium | Milestone: | 2.1 |
| Component: | General | Version: | 2.0.2 |
| Severity: | major | Keywords: | |
| Cc: | External ID: | 1236462 |
Description
A customer who has a map with 700+ layers. Currently each layer sends request to generate legend even if it’s hidden or disabled. The legend should be generated on demand to improve performance.
Expect: The legend generated dynamically, so the map author could improve the performace by well organized groups.
- For the layers which are not displayed in the legend, browser should not send requests to generate legend images.
- If the user expand a group, then the request will be sent out to generate the legend images for the layers in that group.
- If a layer's legend image is requested, browser will not send requests unless the legend image has been changed due to the scale changing.
Attachments (2)
Change History (10)
follow-up: 2 comment:1 by , 15 years ago
comment:2 by , 15 years ago
Replying to zspitzer:
simply having some basic caching for legend images would really help here
Thanks for your reply. Caching is a good way to resolve such kind fo problems. But for this case, we cannot use cache. For example, if we cached a legend image of a layer, the image will not change during the layer's scale changing. I would like to add a flag in layer item: iconWasRequested to mark if the legend image has been requested. The flag will be set to false while the layer's scale changed.
by , 15 years ago
| Attachment: | Dynamic Legend.patch added |
|---|
follow-up: 4 comment:3 by , 15 years ago
I tried out the patch but found the error that is shown in the attached (extra white box in legend.gif) image. Are you able to reproduce? What I did was open the Sheboygan sample and zoomed in until the themed parcel layer showed up.
comment:4 by , 15 years ago
Replying to tomfukushima:
I tried out the patch but found the error that is shown in the attached (extra white box in legend.gif) image. Are you able to reproduce? What I did was open the Sheboygan sample and zoomed in until the themed parcel layer showed up.
I can reproduce that. Howerver, it's reproducible in previous revision either.
comment:5 by , 15 years ago
comment:6 by , 15 years ago
| Resolution: | → fixed |
|---|---|
| Status: | new → closed |
comment:7 by , 15 years ago
| Milestone: | → 2.1 |
|---|
simply having some basic caching for legend images would really help here