MeasureToolbar: New toolbar to easily measure

[jorix]

Why?

To measure with OpenLayers is necessary to use {Control.Measure} but operationalizing it requires some API user effort: search examples, understand the use of handlers and style, know how to display data on the map; too complex for a novice to do well.

I have also done this by creating a toolbar with the {Control.Panel}. I think we can simplify the use of APIs for the beginners, and allows experts to make changes to more features. The code required is only:

toool = new OpenLayers.Control.MeasureToolbar();
map.addControl(toool);

What is it?

MeasureToolbar is a simple toolbar to measure. It is easy to use for end user. It displays a toolbar with buttons help texts. Inherits from: {OpenLayers.Control.Panel}

Characterized by:

• Show the data in the div into Panel, the developer may forget to make a div for this.
• For polygons simultaneously shows the area and perimeter length.
• Allows measurement of features in a vector layers and also reports the name of the feature.

Other features:

• Measures are not rounded to a fixed number of decimals, are showing only the significant digits (default 4, for example shows: 134.2 m, 3.437km or 453,500 km)
• You can copy the text of the measure obtained. It has disabled some mouse events on the div of the measure to allow copying.
• When the option measureLayers is active, the vector layers are automatically detected when calling map.addControl().
• The buttons have title (currently only in English, Spanish and Catalan [my native language])

I suggest small changes in {Control.Measure}. They are necessary for to give length and area simultaneously, and also to allow for measuring a geometry from a vector layers. I passed test for Control/Measure.html correctly in IE8, FF3.5 and CH3.

NOTE: The patch also contains an example of using.

Sorry: My English is bad. I used a machine translation and after that, I reviewed as well as I can.

[jorix]

Patch: diff of code. Also with example usage

[jorix]

Images of the buttons in toolbar, to put in: theme\default\img\MultiToolbar.png

[jorix]

I'm finishing another multipurpose toolbar. Do you want that you sent it?

Do you think my work right?

please review, thanks.

[jorix]

See #2509