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2014/10/16 ¤W¤È 08:13:10
android Programming Glossary: equatorHow to compute a radius around a point in an Android MapView? http://stackoverflow.com/questions/2077054/how-to-compute-a-radius-around-a-point-in-an-android-mapview 's metersToEquatorPixels which is admittedly just for equatorial distance isn't giving me an accurate enough distance in pixels.. projection . This means that the further you get from the equator the more distorted the distances become. According to this discussion..
Android phone orientation overview including compass http://stackoverflow.com/questions/4819626/android-phone-orientation-overview-including-compass 0 degrees longitude prime meridian and 0 degrees latitude equator . This location is actually in the sea off the coast of Africa..
Draw A Circle On Android MapView http://stackoverflow.com/questions/5293709/draw-a-circle-on-android-mapview that converts from meters to pixels for points at the equator . If however your desired point is not on the equator the radius.. the equator . If however your desired point is not on the equator the radius will be too small because the conversion does not..
Android: How do I set the zoom level of map view to 1 km radius around my current location? http://stackoverflow.com/questions/6002563/android-how-do-i-set-the-zoom-level-of-map-view-to-1-km-radius-around-my-curren out how The doc says that the zoom level 1 will map earths equator to 256 pixels. So how do I calculate which zoom level I need.. the following code private int calculateZoomLevel double equatorLength 6378140 in meters double widthInPixels screenWidth double.. double widthInPixels screenWidth double metersPerPixel equatorLength 256 int zoomLevel 1 while metersPerPixel widthInPixels..
How to compute a radius around a point in an Android MapView? http://stackoverflow.com/questions/2077054/how-to-compute-a-radius-around-a-point-in-an-android-mapview think accuracy of coordinate in. Using MapView 's Projection 's metersToEquatorPixels which is admittedly just for equatorial distance isn't giving me an accurate enough distance in pixels . How would you compute this if you wanted to display.. share improve this question So Google Maps uses a Mercator projection . This means that the further you get from the equator the more distorted the distances become. According to this discussion the proper way to convert for distances is something..
Android phone orientation overview including compass http://stackoverflow.com/questions/4819626/android-phone-orientation-overview-including-compass in parts or fill in any blanks. I imagine I am standing at 0 degrees longitude prime meridian and 0 degrees latitude equator . This location is actually in the sea off the coast of Africa but bear with me. I hold my phone in front of my face so..
Draw A Circle On Android MapView http://stackoverflow.com/questions/5293709/draw-a-circle-on-android-mapview answer is that the circleRadius was calculated using a method that converts from meters to pixels for points at the equator . If however your desired point is not on the equator the radius will be too small because the conversion does not account.. a method that converts from meters to pixels for points at the equator . If however your desired point is not on the equator the radius will be too small because the conversion does not account for the fact that meridians come together at the poles...
Android: How do I set the zoom level of map view to 1 km radius around my current location? http://stackoverflow.com/questions/6002563/android-how-do-i-set-the-zoom-level-of-map-view-to-1-km-radius-around-my-curren to set the map view zoomed to 1km radius but cant figure out how The doc says that the zoom level 1 will map earths equator to 256 pixels. So how do I calculate which zoom level I need to set so that the map view shows area in 1KM radius UPDATE.. in 1KM radius UPDATE After reading a few blog posts I wrote the following code private int calculateZoomLevel double equatorLength 6378140 in meters double widthInPixels screenWidth double metersPerPixel equatorLength 256 int zoomLevel 1 while metersPerPixel.. int calculateZoomLevel double equatorLength 6378140 in meters double widthInPixels screenWidth double metersPerPixel equatorLength 256 int zoomLevel 1 while metersPerPixel widthInPixels 2000 metersPerPixel 2 zoomLevel Log.i ADNAN zoom level zoomLevel..
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