[Patch needs rework] Provide a "zoom to all downloaded" feature

[AM909]

Currently, View->Zoom to Download zooms only to the last downloaded area. Because of the size limitations in the API, it is often necessary to build a layer with multiple downloads. There is currently no way to zoom to the union of the downloaded areas. Zoom to data usually includes far more area than needed because of large boundary polygons and the like that fall outside the download bounds.

A new feature View->Zoom to All Downloaded would zoom to the union of the individual download (or merged layer) bounds.

[skyper]

I wonder if Zoom to Download should not be adjusted to work like this ? Or is there any reason why it only takes the BBOX of last download action ?

[simon04]

Why is "Zoom to data" insufficient?

[AM909]

As I said, it shows far more than the downloaded area because of boundary and other long ways.

Download <bounds minlat='34.1419655' minlon='-118.2308936' maxlat='34.1501699' maxlon='-118.2206368' />. It's an area about 950x950 m. When you Zoom to Download, the scale is about 95m (for 10"x10" viewport).

However, if you Zoom to Data, you get an area of about 17000x17000 m (scale 1700 m), over 17x what is appropriate, and you can barely see the area of interest, much less edit it.

I do think it's useful to have both last download and union download features.

[simon04]

Patch attached. For the icon, $ cp images/dialogs/autoscale/{,all}download.png.

[stoecker]

Hmm, I don't like this solution.

Another proposal: Make zoom to download toggle download areas. First call: Last download, second call previous, ... after circling all, then zoom to complete joined area, then again to last. When last zoom action is older than _config_value (e.g. 30 seconds), then start cycle from scratch.

Needs two variables: The last displayed download box number and the time when it was displayed.