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package com.mapbox.mapboxsdk.location;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.GradientDrawable;
import android.graphics.drawable.LayerDrawable;
import android.location.Location;
import android.os.Build;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import com.mapbox.mapboxsdk.geometry.LatLng;
import com.mapbox.mapboxsdk.log.Logger;
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 static final String TAG = "Mbgl-com.mapbox.mapboxsdk.location.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;
}
/**
* Normalizes an angle to be in the [0, 360] range.
*
* @param angle the provided angle
* @return the normalized angle
*/
public static float normalize(float angle) {
return (angle % 360 + 360) % 360;
}
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());
try {
drawable.draw(canvas);
} catch (IllegalArgumentException ex) {
if (ex.getMessage().equals("radius must be > 0") && Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
Logger.w(TAG,
"Location's shadow gradient drawable has a radius <= 0px, resetting to 1px in order to avoid crashing");
ensureShadowGradientRadius(drawable);
return generateShadow(drawable, elevation);
} else {
throw ex;
}
}
bitmap = Bitmap.createScaledBitmap(bitmap,
toEven(width + elevation), toEven(height + elevation), false);
return bitmap;
}
/**
* We need to ensure that the radius of any {@link GradientDrawable} is greater than 0 for API levels < 21.
*
* @see <a href=https://github.com/mapbox/mapbox-gl-native/issues/15026>mapbox-gl-native-#15026</a>
*/
private static void ensureShadowGradientRadius(Drawable drawable) {
if (drawable instanceof GradientDrawable) {
((GradientDrawable) drawable).setGradientRadius(1);
} else if (drawable instanceof LayerDrawable) {
LayerDrawable layerDrawable = (LayerDrawable) drawable;
for (int i = 0; i < layerDrawable.getNumberOfLayers(); i++) {
Drawable layers = layerDrawable.getDrawable(i);
if (layers instanceof GradientDrawable) {
((GradientDrawable) layers).setGradientRadius(1);
}
}
}
}
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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