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Map view doesn't display image of extent specified into the Web object automatically into the map view after I applied changes. I used the "tutorial.map". The whole Canada is shown into the map view. I selected the Web object into the object browser view. I changed the extent into the object properties view to cover a single province extent (example: Ontario). I applied the changes and I expected to see the Ontario province only into the map view. The whole Canada is still showing. I zoomed to the full extent of the map. The whole Canada is showing again. I had to zoom in to the Ontario province. I then zoomed to the full extent again and now the Ontario province only is shown. So, it is corresponding approximatively to the extent I specified. RedHat 7.2, Firebird 0.7, Chameleon cvs 10/16/2003, MapLab 10/14/2003
Fix: -Update dhtml map widget to use mapfile values if none are specified in the application template -Update the preview template to ensure it doesn't specify any extents.
the problem is that the preview was (and probably still is) designed to remember the last extents you zoomed to. In most cases, this is desirable. I think the reasonable behaviour in this case is that if the new extents do not entirely encompass the current extents, then the preview should be zoomed to the new extents, otherwise the maximum extents of the preview should be updated (so the zoom to full extents button works reasonably) but the current extents should not be changed. An alternative would be to zoom to the new extents any time the extents are changed. This would be the first time that we would do something special based on a value in the map file changing. Not sure I like this idea.
I don't think the extents of the preview should change when you change the extents in the object properties. However if you click the zoom to full extents button, you should be zoomed to the extents that you just applied to the mapfile for sure!
Paul says: "...otherwise the maximum extents of the preview should be updated (so the zoom to full extents button works reasonably) but the current extents should not be changed.". Can explain me a little bit more what do you mean by "the current extents should not be change." and where the current extents appear?
Additional comments: 1)When we change the properties of an object and we apply the changes, the map preview is updated as soon as we apply the changes. For example, if we change the outline color in the scalebar object properties and we apply the change, the outline color of the scalebar in the preview map is updated right away. So, what I have in mind for the behaviour of the map extents was the same. 2)Based on Paul comments: Preview Current extents Zoom to full extents 1) Smaller new extents Change to new extents Not changed 2) Greater new extents Not changed Changed to new extents In case two, if I apply the changes and come back to look to the map extents in the object properties view, the extents will be the same as before I entered the new extents. Correct? In case one, suppose I built an application based on the data of the whole Canada and I want to show a map of the Ontario province only. I specified the Ontario extents. Then, if I do a zoom to full extents, how can I come back to the Ontario province map?
This is what I propose. Preview Current extents Zoom to full extents 1) Smaller new extents Not changed Changed to new extents 2) Greater new extents Not changed Changed to new extents That's consistent behaviour that makes sense to me. The other way feels inconsistant, and may lead users to think somethings broken.
3) At previous full extents Changed to new extents Changed to new extents
