diff --git a/platform/qt/app/mapwindow.cpp b/platform/qt/app/mapwindow.cpp
index da8a9767ce8..bc83e2d972d 100644
--- a/platform/qt/app/mapwindow.cpp
+++ b/platform/qt/app/mapwindow.cpp
@@ -1,7 +1,9 @@
 #include "mapwindow.hpp"
 
 #include <QApplication>
+#include <QColor>
 #include <QDebug>
+#include <QFile>
 #include <QIcon>
 #include <QKeyEvent>
 #include <QMouseEvent>
@@ -73,6 +75,33 @@ void MapWindow::keyPressEvent(QKeyEvent *ev)
     case Qt::Key_S:
         changeStyle();
         break;
+    case Qt::Key_L: {
+            m_map.setPaintProperty("water", "fill-color", QColor(255, 0, 0));
+            m_map.setPaintProperty("building", "fill-color", "red");
+            m_map.setPaintProperty("road-secondary-tertiary", "line-color", "red");
+
+            m_map.setLayoutProperty("road-label-small", "symbol-placement", "point");
+            m_map.setLayoutProperty("road-label-medium", "symbol-placement", "point");
+            m_map.setLayoutProperty("road-label-large", "symbol-placement", "point");
+
+            QFile geojson(":source.geojson");
+            geojson.open(QIODevice::ReadOnly);
+
+            QVariantMap testSource;
+            testSource["type"] = "geojson";
+            testSource["data"] = geojson.readAll();
+
+            m_map.addSource("testSource", testSource);
+
+            QVariantMap testLayer;
+            testLayer["id"] = "testLayer";
+            testLayer["type"] = "fill";
+            testLayer["source"] = "testSource";
+
+            m_map.addLayer(testLayer);
+            m_map.setPaintProperty("testLayer", "fill-color", QColor("blue"));
+        }
+        break;
     case Qt::Key_Tab:
         m_map.cycleDebugOptions();
         break;
diff --git a/platform/qt/app/qmapboxgl.gypi b/platform/qt/app/qmapboxgl.gypi
index 62a2939ad2f..22b4e1281e6 100644
--- a/platform/qt/app/qmapboxgl.gypi
+++ b/platform/qt/app/qmapboxgl.gypi
@@ -17,6 +17,7 @@
         'main.cpp',
         'mapwindow.cpp',
         'mapwindow.hpp',
+        'source.qrc',
       ],
 
       'include_dirs': [
@@ -30,6 +31,8 @@
           '<@(qt_gui_cflags)',
           '<@(qt_opengl_cflags)',
           '-fPIC',
+          # Qt4 generates code with unused variables.
+          '-Wno-unused-variable',
         ],
         'ldflags': [
           '<@(opengl_ldflags)',
diff --git a/platform/qt/app/source.geojson b/platform/qt/app/source.geojson
new file mode 100644
index 00000000000..f639c1913e4
--- /dev/null
+++ b/platform/qt/app/source.geojson
@@ -0,0 +1,253 @@
+{
+  "type": "FeatureCollection",
+  "features": [
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Polygon",
+        "coordinates": [
+          [
+            [
+              69.2578125,
+              -40.17887331434695
+            ],
+            [
+              69.2578125,
+              -10.141931686131018
+            ],
+            [
+              110.74218749999999,
+              -10.141931686131018
+            ],
+            [
+              110.74218749999999,
+              -40.17887331434695
+            ],
+            [
+              69.2578125,
+              -40.17887331434695
+            ]
+          ]
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Polygon",
+        "coordinates": [
+          [
+            [
+              -71.71875,
+              -33.43144133557529
+            ],
+            [
+              -71.71875,
+              20.3034175184893
+            ],
+            [
+              -0.703125,
+              20.3034175184893
+            ],
+            [
+              -0.703125,
+              -33.43144133557529
+            ],
+            [
+              -71.71875,
+              -33.43144133557529
+            ]
+          ]
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Polygon",
+        "coordinates": [
+          [
+            [
+              97.3828125,
+              38.548165423046584
+            ],
+            [
+              97.3828125,
+              65.2198939361321
+            ],
+            [
+              155.0390625,
+              65.2198939361321
+            ],
+            [
+              155.0390625,
+              38.548165423046584
+            ],
+            [
+              97.3828125,
+              38.548165423046584
+            ]
+          ]
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Polygon",
+        "coordinates": [
+          [
+            [
+              24.93617534637451,
+              60.17058143435276
+            ],
+            [
+              24.93617534637451,
+              60.17149933938796
+            ],
+            [
+              24.93808507919311,
+              60.17149933938796
+            ],
+            [
+              24.93808507919311,
+              60.17058143435276
+            ],
+            [
+              24.93617534637451,
+              60.17058143435276
+            ]
+          ]
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Polygon",
+        "coordinates": [
+          [
+            [
+              24.94398593902588,
+              60.170346617317186
+            ],
+            [
+              24.94398593902588,
+              60.171456646699184
+            ],
+            [
+              24.947032928466797,
+              60.171456646699184
+            ],
+            [
+              24.947032928466797,
+              60.170346617317186
+            ],
+            [
+              24.94398593902588,
+              60.170346617317186
+            ]
+          ]
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Polygon",
+        "coordinates": [
+          [
+            [
+              24.938321113586426,
+              60.16800902895082
+            ],
+            [
+              24.938321113586426,
+              60.169204528711674
+            ],
+            [
+              24.941797256469727,
+              60.169204528711674
+            ],
+            [
+              24.941797256469727,
+              60.16800902895082
+            ],
+            [
+              24.938321113586426,
+              60.16800902895082
+            ]
+          ]
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Polygon",
+        "coordinates": [
+          [
+            [
+              24.939115047454834,
+              60.17280143974311
+            ],
+            [
+              24.939115047454834,
+              60.17387936902026
+            ],
+            [
+              24.94175434112549,
+              60.17387936902026
+            ],
+            [
+              24.94175434112549,
+              60.17280143974311
+            ],
+            [
+              24.939115047454834,
+              60.17280143974311
+            ]
+          ]
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Polygon",
+        "coordinates": [
+          [
+            [
+              24.944372177124023,
+              60.16034398818875
+            ],
+            [
+              24.944372177124023,
+              60.16837195311943
+            ],
+            [
+              24.963769912719727,
+              60.16837195311943
+            ],
+            [
+              24.963769912719727,
+              60.16034398818875
+            ],
+            [
+              24.944372177124023,
+              60.16034398818875
+            ]
+          ]
+        ]
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/platform/qt/app/source.qrc b/platform/qt/app/source.qrc
new file mode 100644
index 00000000000..60282b7178a
--- /dev/null
+++ b/platform/qt/app/source.qrc
@@ -0,0 +1,5 @@
+<RCC>
+    <qresource prefix="/">
+        <file>source.geojson</file>
+    </qresource>
+</RCC>