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package com.mapbox.mapboxsdk.location;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.location.Location;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import com.mapbox.mapboxsdk.geometry.LatLng;
import com.mapbox.mapboxsdk.maps.MapboxMap;
import com.mapbox.mapboxsdk.maps.Projection;
import static com.mapbox.mapboxsdk.location.LocationComponentConstants.INSTANT_LOCATION_TRANSITION_THRESHOLD;
public final class Utils {
private Utils() {
// Class should not be initialized
}
/**
* Util for finding the shortest path from the current rotated degree to the new degree.
*
* @param heading the new position of the rotation
* @param previousHeading the current position of the rotation
* @return the shortest degree of rotation possible
*/
public static float shortestRotation(float heading, float previousHeading) {
double diff = previousHeading - heading;
if (diff > 180.0f) {
heading += 360.0f;
} else if (diff < -180.0f) {
heading -= 360.f;
}
return heading;
}
static Bitmap generateShadow(Drawable drawable, float elevation) {
int width = drawable.getIntrinsicWidth();
int height = drawable.getIntrinsicHeight();
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
bitmap = Bitmap.createScaledBitmap(bitmap,
toEven(width + elevation), toEven(height + elevation), false);
return bitmap;
}
static float calculateZoomLevelRadius(@NonNull MapboxMap mapboxMap, @Nullable Location location) {
if (location == null) {
return 0;
}
double metersPerPixel = mapboxMap.getProjection().getMetersPerPixelAtLatitude(location.getLatitude());
return (float) (location.getAccuracy() * (1 / metersPerPixel));
}
static boolean immediateAnimation(@NonNull Projection projection, @NonNull LatLng current, @NonNull LatLng target) {
double metersPerPixel = projection.getMetersPerPixelAtLatitude((current.getLatitude() + target.getLatitude()) / 2);
double distance = current.distanceTo(target);
return distance / metersPerPixel > INSTANT_LOCATION_TRANSITION_THRESHOLD;
}
/**
* Casts the value to an even integer.
*/
private static int toEven(float value) {
int i = (int) (value + .5f);
if (i % 2 == 1) {
return i - 1;
}
return i;
}
}
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