[qt] Add example of feature collection data for GeoJSON source

The example shows that both of QList<QMapbox::Feature> and
QVector<QMapbox::Feature> can be used as feature collection data
for GeoJSON layer.

1 files changed, 54 insertions, 0 deletions

diff --git a/platform/qt/app/mapwindow.cpp b/platform/qt/app/mapwindow.cpp
index 551af4630b..47dc1c8190 100644
--- a/platform/qt/app/mapwindow.cpp
+++ b/platform/qt/app/mapwindow.cpp
@@ -346,6 +346,60 @@ void MapWindow::keyPressEvent(QKeyEvent *ev)
             }
         }
         break;
+    case Qt::Key_6: {
+            if (m_map->layerExists("innerCirclesLayer") || m_map->layerExists("outerCirclesLayer")) {
+                m_map->removeLayer("innerCirclesLayer");
+                m_map->removeLayer("outerCirclesLayer");
+                m_map->removeSource("innerCirclesSource");
+                m_map->removeSource("outerCirclesSource");
+            } else {
+                auto makePoint = [&] (double dx, double dy, const QString &color) {
+                    auto coordinate = m_map->coordinate();
+                    coordinate.first += dx;
+                    coordinate.second += dy;
+                    return QMapbox::Feature{QMapbox::Feature::PointType,
+                        {{{coordinate}}}, {{"color", color}}, {}};
+                };
+
+                // multiple features by QVector<QMapbox::Feature>
+                QVector<QMapbox::Feature> inner{
+                    makePoint(0.001,  0, "red"),
+                    makePoint(0,  0.001, "green"),
+                    makePoint(0, -0.001, "blue")
+                };
+
+                m_map->addSource("innerCirclesSource",
+                    {{"type", "geojson"}, {"data", QVariant::fromValue(inner)}});
+                m_map->addLayer({
+                    {"id", "innerCirclesLayer"},
+                    {"type", "circle"},
+                    {"source", "innerCirclesSource"}
+                });
+
+                // multiple features by QList<QMapbox::Feature>
+                QList<QMapbox::Feature> outer{
+                    makePoint( 0.002,  0.002, "cyan"),
+                    makePoint(-0.002,  0.002, "magenta"),
+                    makePoint( 0.002, -0.002, "yellow"),
+                    makePoint(-0.002, -0.002, "black")
+                };
+
+                m_map->addSource("outerCirclesSource",
+                    {{"type", "geojson"}, {"data", QVariant::fromValue(outer)}});
+                m_map->addLayer({
+                    {"id", "outerCirclesLayer"},
+                    {"type", "circle"},
+                    {"source", "outerCirclesSource"}
+                });
+
+                QVariantList getColor{"get", "color"};
+                m_map->setPaintProperty("innerCirclesLayer", "circle-radius", 10.0);
+                m_map->setPaintProperty("innerCirclesLayer", "circle-color", getColor);
+                m_map->setPaintProperty("outerCirclesLayer", "circle-radius", 15.0);
+                m_map->setPaintProperty("outerCirclesLayer", "circle-color", getColor);
+            }
+        }
+        break;
     case Qt::Key_Tab:
         m_map->cycleDebugOptions();
         break;