[VTM][Android] Screen position in pixels

[Jaca]

Hi,

How to convert geoPoint to screen coordinates having bearing & tilt? I want to draw (on the fly) a lot of custom markers on MapView canvas (dispatchDraw(Canvas canvas)).

Jacek

[Emux]

You can find such utilities in MercatorProjection class.

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Emux

[Emux]

But the markers are set properly on coordinates (and the map rotates / tilt them) - not on pixels.

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Emux

[Jaca]

But my markers change position and appearance. MercatorProjection.getPixel() doesn't work with rotation.

ps. Google.mapGoogleMap.getProjection().toScreenLocation() works OK. ;-)

[Emux]

See the marker example in the samples for how to properly add markers on map.

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Emux

[Jaca]

I tried but update of markers is too slow because everyone has their own (drawn on the fly) bitmap.

[Jaca]

;-)

... I'm optimizing display and I've a question: how to simple show/hide created marker(s) by setVisible(true/false)?

[Emux]

You can use the setEnabled method on the layer or remove / add the markers in the ItemizedLayer.

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Emux

[Jaca]

Hi Emux, ;-)

I have a problem with the VectorLayer. Could You check why a shape on the VectorLayer doesn't show very often after starting VectorLayerActivity?

Use VectorLayerActivity from examples and:

1. change number of shapes to one

2. increase size of shape

3. change position to fixed GeoPoint(0.0f, 0.0f)

4. run several times...

The map needs to be moved to refresh (and display shape) very often.

[Emux]

Please create new topics for new questions, so that users can search them easier in the future.

> The map needs to be moved to refresh (and display shape) very often.

You need to call the vectorLayer.update() like in the sample.

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Emux