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Canvas Map API: Difference between revisions
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→Adding support for new Layer Types
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Note that the model merely stores the data - only the draw* callback will try to access it, i.e. the lat/lon/id fields. | Note that the model merely stores the data - only the draw* callback will try to access it, i.e. the lat/lon/id fields. | ||
Also, the LayerModel class is currently just an extremely simple wrapper, all of its fields/methods are directly available to you: | |||
<syntaxhighlight lang="php"> | |||
## | |||
# A layer model is just a wrapper for a vector with elements | |||
# either updated via a timer or via a listener | |||
var LayerModel = {_elements:[] }; | |||
LayerModel.new = func make(LayerModel); | |||
LayerModel.clear = func me._elements = []; | |||
LayerModel.push = func (e) append(me._elements, e); | |||
LayerModel.get = func me._elements; | |||
LayerModel.update = func; | |||
LayerModel.hasData = func size(me. _elements); | |||
</syntaxhighlight> | |||
That is, you have the following methods available: | |||
* new() - to create a new LayerModel instance | |||
* clear() - to clear the internal _elements vector | |||
* push() - to append new data to the internal _elements vector | |||
* get() - to get a handle to the internal _elements vector | |||
* update() - empty placeholder for the time being | |||
* hasData() - to get the size of the internal _elements vector (beginning at 0) | |||
Now, to actually make a new layer known to the system, we need to add another file that registers the layer. For an example of how to do this, please see navaids.layer: | Now, to actually make a new layer known to the system, we need to add another file that registers the layer. For an example of how to do this, please see navaids.layer: | ||