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[android] - add hooks for bulk conversion of geographic coordinates to screen coordinates

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tobrun
2019-12-05 15:49:56 +01:00
committed by Tobrun
parent 9f3a384296
commit 1ac3e9e9c2
2 changed files with 58 additions and 0 deletions
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54
platform/android/src/native_map_view.cpp
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@@ -621,10 +621,62 @@ jni::Local<jni::Object<PointF>> NativeMapView::pixelForLatLng(JNIEnv& env, jdoub
return PointF::New(env, static_cast<float>(pixel.x), static_cast<float>(pixel.y));
}
void NativeMapView::pixelsForLatLngs(JNIEnv& env,
const jni::Array<jdouble>& input,
jni::Array<jdouble>& output,
jfloat pixelRatio) {
jni::NullCheck(env, &input);
std::size_t len = input.Length(env);
std::vector<mbgl::LatLng> latLngs;
latLngs.reserve(len);
for (std::size_t i = 0; i < len; i += 2) {
auto latLng = mbgl::LatLng(input.Get(env, i), input.Get(env, i + 1));
latLngs.push_back(latLng);
}
std::vector<jdouble> buffer;
buffer.reserve(len);
std::vector<ScreenCoordinate> coordinates = map->pixelsForLatLngs(latLngs);
for (std::size_t i = 0; i < len / 2; i++) {
buffer.push_back(coordinates[i].x * pixelRatio);
buffer.push_back(coordinates[i].y * pixelRatio);
}
output.SetRegion<std::vector<jdouble>>(env, 0, buffer);
}
jni::Local<jni::Object<LatLng>> NativeMapView::latLngForPixel(JNIEnv& env, jfloat x, jfloat y) {
return LatLng::New(env, map->latLngForPixel(mbgl::ScreenCoordinate(x, y)));
}
void NativeMapView::latLngsForPixels(JNIEnv& env,
const jni::Array<jdouble>& input,
jni::Array<jdouble>& output,
jfloat pixelRatio) {
jni::NullCheck(env, &input);
std::size_t len = input.Length(env);
std::vector<mbgl::ScreenCoordinate> coordinates;
coordinates.reserve(len);
for (std::size_t i = 0; i < len; i += 2) {
auto coordinate = mbgl::ScreenCoordinate(input.Get(env, i) / pixelRatio, input.Get(env, i + 1) / pixelRatio);
coordinates.push_back(coordinate);
}
std::vector<jdouble> buffer;
buffer.reserve(len);
std::vector<mbgl::LatLng> latLngs = map->latLngsForPixels(coordinates);
for (std::size_t i = 0; i < len / 2; i++) {
buffer.push_back(latLngs[i].latitude());
buffer.push_back(latLngs[i].longitude());
}
output.SetRegion<std::vector<jdouble>>(env, 0, buffer);
}
jni::Local<jni::Array<jlong>> NativeMapView::addPolylines(JNIEnv& env, const jni::Array<jni::Object<Polyline>>& polylines) {
NullCheck(env, &polylines);
std::size_t len = polylines.Length(env);
@@ -1122,8 +1174,10 @@ void NativeMapView::registerNative(jni::JNIEnv& env) {
METHOD(&NativeMapView::getMetersPerPixelAtLatitude, "nativeGetMetersPerPixelAtLatitude"),
METHOD(&NativeMapView::projectedMetersForLatLng, "nativeProjectedMetersForLatLng"),
METHOD(&NativeMapView::pixelForLatLng, "nativePixelForLatLng"),
METHOD(&NativeMapView::pixelsForLatLngs, "nativePixelsForLatLngs"),
METHOD(&NativeMapView::latLngForProjectedMeters, "nativeLatLngForProjectedMeters"),
METHOD(&NativeMapView::latLngForPixel, "nativeLatLngForPixel"),
METHOD(&NativeMapView::latLngsForPixels, "nativeLatLngsForPixels"),
METHOD(&NativeMapView::addPolylines, "nativeAddPolylines"),
METHOD(&NativeMapView::addPolygons, "nativeAddPolygons"),
METHOD(&NativeMapView::updatePolyline, "nativeUpdatePolyline"),