From 18c52ab5e406e2d22cd99d0bbb09d67d51ba0e65 Mon Sep 17 00:00:00 2001
From: "Thiago Marcos P. Santos" <thiago@mapbox.com>
Date: Fri, 28 Apr 2017 21:53:25 +0300
Subject: [PATCH] [Qt] Add extrusion example to the Qt app

---
 platform/qt/app/mapwindow.cpp | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/platform/qt/app/mapwindow.cpp b/platform/qt/app/mapwindow.cpp
index 345c5196b..a72faf005 100644
--- a/platform/qt/app/mapwindow.cpp
+++ b/platform/qt/app/mapwindow.cpp
@@ -201,6 +201,40 @@ void MapWindow::keyPressEvent(QKeyEvent *ev)
 
             m_map->setLayoutProperty("road-label-small", "text-pitch-alignment", "viewport");
             m_map->setLayoutProperty("road-label-small", "text-size", 30.0);
+
+            // Buildings extrusion
+            QVariantMap buildings;
+            buildings["id"] = "3d-buildings";
+            buildings["source"] = "composite";
+            buildings["source-layer"] = "building";
+            buildings["type"] = "fill-extrusion";
+            buildings["minzoom"] = 15.0;
+            m_map->addLayer(buildings);
+
+            QVariantList buildingsFilterExpression;
+            buildingsFilterExpression.append("==");
+            buildingsFilterExpression.append("extrude");
+            buildingsFilterExpression.append("true");
+
+            QVariantList buildingsFilter;
+            buildingsFilter.append(buildingsFilterExpression);
+
+            m_map->setFilter("3d-buildings", buildingsFilterExpression);
+
+            m_map->setPaintProperty("3d-buildings", "fill-extrusion-color", "#aaa");
+            m_map->setPaintProperty("3d-buildings", "fill-extrusion-opacity", .6);
+
+            QVariantMap extrusionHeight;
+            extrusionHeight["type"] = "identity";
+            extrusionHeight["property"] = "height";
+
+            m_map->setPaintProperty("3d-buildings", "fill-extrusion-height", extrusionHeight);
+
+            QVariantMap extrusionBase;
+            extrusionBase["type"] = "identity";
+            extrusionBase["property"] = "min_height";
+
+            m_map->setPaintProperty("3d-buildings", "fill-extrusion-base", extrusionBase);
         }
         break;
     case Qt::Key_1: {