changed 3D rendering

added pan/zoom gesture

mapview/2D/tools/ToolMapZoom.h

@@ -9,6 +9,8 @@
  */
 class ToolMapZoom : public Tool {
 
+	float startScale = NAN;
+
 public:
 
 	const std::string getName() const override {
@@ -32,6 +34,34 @@ public:
 
 	}
 
+	virtual bool pinchTriggered(MapView2D *m, QPinchGesture* g) override {
+
+		Scaler& s = m->getScaler();
+		// https://doc.qt.io/qt-5/qtwidgets-gestures-imagegestures-example.html
+
+		QPinchGesture::ChangeFlags changeFlags = g->changeFlags();
+		if (changeFlags & QPinchGesture::RotationAngleChanged) {
+//				qreal rotationDelta = gesture->rotationAngle() - gesture->lastRotationAngle();
+//				rotationAngle += rotationDelta;
+//				qCDebug(lcExample) << "pinchTriggered(): rotate by" <<
+//					rotationDelta << "->" << rotationAngle;
+		}
+		if (changeFlags & QPinchGesture::ScaleFactorChanged) {
+			if (startScale != startScale) {startScale = s.getScale();}
+			s.setScale(startScale * g->totalScaleFactor());
+		}
+		if (g->state() == Qt::GestureFinished) {
+			startScale = NAN;
+		}
+
+		if (s.getScale() > 1000) {s.setScale(1000);}
+		if (s.getScale() < 5) {s.setScale(5);}
+
+		return true;
+
+
+	}
+
 };
 
 #endif // TOOLMAPZOOM_H