[core] allow changing pitch in GLFW based apps

include/mbgl/platform/default/glfw_view.hpp

@@ -65,6 +65,7 @@ private:
     const bool benchmark = false;
     bool tracking = false;
     bool rotating = false;
+    bool pitching = false;
 
     // Frame timer
     int frames = 0;

include/mbgl/platform/default/settings_json.hpp

@@ -15,6 +15,7 @@ public:
     double latitude = 0;
     double zoom = 0;
     double bearing = 0;
+    double pitch = 0;
 
     bool debug = false;
 };

linux/main.cpp

@@ -35,7 +35,7 @@ int main(int argc, char *argv[]) {
     bool benchmark = false;
     std::string style;
     double latitude = 0, longitude = 0;
-    double bearing = 0, zoom = 1;
+    double bearing = 0, zoom = 1, pitch = 0;
     bool skipConfig = false;
 
     const struct option long_options[] = {
@@ -46,6 +46,7 @@ int main(int argc, char *argv[]) {
         {"lat", required_argument, 0, 'y'},
         {"zoom", required_argument, 0, 'z'},
         {"bearing", required_argument, 0, 'r'},
+        {"pitch", required_argument, 0, 'p'},
         {0, 0, 0, 0}
     };
 
@@ -83,6 +84,10 @@ int main(int argc, char *argv[]) {
             bearing = atof(optarg);
             skipConfig = true;
             break;
+        case 'p':
+            pitch = atof(optarg);
+            skipConfig = true;
+            break;
         default:
             break;
         }
@@ -121,10 +126,12 @@ int main(int argc, char *argv[]) {
     if (skipConfig) {
         map.setLatLngZoom(mbgl::LatLng(latitude, longitude), zoom);
         map.setBearing(bearing);
+        map.setPitch(pitch);
         mbgl::Log::Info(mbgl::Event::General, "Location: %f/%f (z%.2f, %.2f deg)", latitude, longitude, zoom, bearing);
     } else {
         map.setLatLngZoom(mbgl::LatLng(settings.latitude, settings.longitude), settings.zoom);
         map.setBearing(settings.bearing);
+        map.setPitch(settings.pitch);
         map.setDebug(settings.debug);
     }
 
@@ -159,6 +166,7 @@ int main(int argc, char *argv[]) {
     settings.longitude = latLng.longitude;
     settings.zoom = map.getZoom();
     settings.bearing = map.getBearing();
+    settings.pitch = map.getPitch();
     settings.debug = map.getDebug();
     if (!skipConfig) {
         settings.save();

macosx/main.mm

@@ -167,6 +167,7 @@ int main(int argc, char* argv[]) {
     mbgl::Settings_NSUserDefaults settings;
     map.setLatLngZoom(mbgl::LatLng(settings.latitude, settings.longitude), settings.zoom);
     map.setBearing(settings.bearing);
+    map.setPitch(settings.pitch);
     map.setDebug(settings.debug);
 
     view.setChangeStyleCallback([&map, &view] () {
@@ -203,6 +204,7 @@ int main(int argc, char* argv[]) {
     settings.longitude = latLng.longitude;
     settings.zoom = map.getZoom();
     settings.bearing = map.getBearing();
+    settings.pitch = map.getPitch();
     settings.debug = map.getDebug();
     settings.save();
 

platform/default/glfw_view.cpp

@@ -305,6 +305,9 @@ void GLFWView::onMouseClick(GLFWwindow *window, int button, int action, int modi
         (button == GLFW_MOUSE_BUTTON_LEFT && modifiers & GLFW_MOD_CONTROL)) {
         view->rotating = action == GLFW_PRESS;
         view->map->setGestureInProgress(view->rotating);
+    } else if (button == GLFW_MOUSE_BUTTON_LEFT && (modifiers & GLFW_MOD_SHIFT)) {
+        view->pitching = action == GLFW_PRESS;
+        view->map->setGestureInProgress(view->pitching);
     } else if (button == GLFW_MOUSE_BUTTON_LEFT) {
         view->tracking = action == GLFW_PRESS;
         view->map->setGestureInProgress(view->tracking);
@@ -336,6 +339,11 @@ void GLFWView::onMouseMove(GLFWwindow *window, double x, double y) {
         }
     } else if (view->rotating) {
         view->map->rotateBy({ view->lastX, view->lastY }, { x, y });
+    } else if (view->pitching) {
+        const double dy = y - view->lastY;
+        if (dy) {
+            view->map->setPitch(view->map->getPitch() - dy / 2);
+        }
     }
     view->lastX = x;
     view->lastY = y;

platform/default/settings_json.cpp

@@ -12,6 +12,7 @@ void Settings_JSON::load() {
         file >> latitude;
         file >> zoom;
         file >> bearing;
+        file >> pitch;
         file >> debug;
     }
 }
@@ -23,6 +24,7 @@ void Settings_JSON::save() {
         file << latitude << std::endl;
         file << zoom << std::endl;
         file << bearing << std::endl;
+        file << pitch << std::endl;
         file << debug << std::endl;
     }
 }
@@ -32,5 +34,6 @@ void Settings_JSON::clear() {
     latitude = 0;
     zoom = 0;
     bearing = 0;
+    pitch = 0;
     debug = false;
 }