I draw a Circle Marker on Google map using the circle option. I have the center point and radius. I want to long/lat of the point on the circle that is x amount of degrees from the X axis. Any idea how?
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I have a map application and cluster of markers. Marker icons are created with BitmapDescriptor.createBitmap. Icons are simple - dot in the center and Gradient circle around it (But this gradient circle should have real-sized radius, meaning if data is 30 meters for the radius - circle should be 30 meters in radius for any zoom level anytime on the map). How can I achieve this, as radiuses in createBitmap argument seem to be dp dependent? I am using ClusterRenderer's onClusterItemUpdated to render a new marker for each zoom level, but can't set a real radius to a bitmap.
i have to draw circle with free hand in onDraw() method.
After drawing the circle, i have to find the radius and center of that circle and show that circle again with drawCircle() method.
Can anyone help me to find the radius and center of circle with free hand drawing.
You could take the center as the average of all the points on the edge.
And the diameter as the largest distance between any two points.
Or once you have the center, find the distance between each edge point and the point across from it. Then average these.
How do I draw a area circle overlay underneath a marker?
For instance you would give the area circle an origin coordinate (Latitude, Longitude) and a radius relative to the origin.
So when you zoom in and out of the map the circle will scale with the zoom level correctly.
There is no standard Overlay in osmdroid for that, but it's quite easy to implement that by copying and simplifying this one: DirectedLocationOverlay
I am trying to make a map overlay that just shows a solid circle from the map center who's radius is a range in meters.
I can't figure out how to calculate the circle's radius. I can get the map center, but I haven't had any luck figuring out how to convert meters into the proper units for the circle's radius.
Thanks for any help.
I've got no experience of doing this in a gMaps context, but the MapView class (whose getProjection() I'm assuming you've used to work out where your point is on the screen) has getLatitudeSpan() and getLongitudeSpan() which you can use against the screen res to calculate the pixel-radius of your circle.
hi friends i want to draw circle around my current location exactly 1 kilometer radius so wat can i do.....i able to draw circle but how to put radius so it becomes exactly one kilometer..
At a high level:
Get the bounding coordinates of your current map view.
Use your coordinates to compute the distance either horizontally or vertically across your map. Convert your distance to meters, if necessary.
Divide your distance in meters by the horizontal or vertical resolution (in pixels) of your map view. This gives you the number of meters per pixel at your current zoom level.
Evaluate 1000 / <meters per pixel> to determine the number of pixels in 1 kilometer at the current zoom level. This is the radius of your circle.
Draw your circle using the radius you got in step 4.