--- a/src/QRCommand.h	Wed Apr 14 20:56:18 2021 +0200
+++ b/src/QRCommand.h	Wed Apr 14 22:02:23 2021 +0200
@@ -32,6 +32,7 @@
 namespace qr {
 
 class QRCommand {
+private:
 	std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: use platform encoding as default / check zbar encoding
 
 
@@ -55,15 +56,10 @@
 			// {L"addon_name", relpipe::writer::TypeId::STRING},
 			{L"value", relpipe::writer::TypeId::STRING},
 			// {L"xml", relpipe::writer::TypeId::STRING},
-			{L"location_size", relpipe::writer::TypeId::INTEGER},
-			{L"x_1", relpipe::writer::TypeId::INTEGER},
-			{L"y_1", relpipe::writer::TypeId::INTEGER},
-			{L"x_2", relpipe::writer::TypeId::INTEGER},
-			{L"y_2", relpipe::writer::TypeId::INTEGER},
-			{L"x_3", relpipe::writer::TypeId::INTEGER},
-			{L"y_3", relpipe::writer::TypeId::INTEGER},
-			{L"x_4", relpipe::writer::TypeId::INTEGER},
-			{L"y_4", relpipe::writer::TypeId::INTEGER},
+			{L"x", relpipe::writer::TypeId::INTEGER},
+			{L"y", relpipe::writer::TypeId::INTEGER},
+			{L"width", relpipe::writer::TypeId::INTEGER},
+			{L"height", relpipe::writer::TypeId::INTEGER},
 		}, true);
 
 		int n = scanner.scan(image);
@@ -74,21 +70,28 @@
 			writer->writeAttribute(convertor.from_bytes(symbol->get_data()));
 			// writer->writeAttribute(convertor.from_bytes(symbol->xml()));
 
-			relpipe::common::type::Integer locationSize = symbol->get_location_size();
-			writer->writeAttribute(&locationSize, typeid (locationSize));
-			
-			for (int i = 0; i < 4; i++) {
-				relpipe::common::type::Integer x = -5;
-				relpipe::common::type::Integer y = -6;
-				if (i < locationSize) {
-					x = symbol->get_location_x(i);
-					y = symbol->get_location_y(i);
-				}
-				writer->writeAttribute(&x, typeid (x));
-				writer->writeAttribute(&y, typeid (y));
+			relpipe::common::type::Integer minX = 0;
+			relpipe::common::type::Integer minY = 0;
+			relpipe::common::type::Integer maxX = 0;
+			relpipe::common::type::Integer maxY = 0;
+
+			// TODO: return original polygon in XML
+			for (int i = 0, locationSize = symbol->get_location_size(); i < locationSize; i++) {
+				relpipe::common::type::Integer x = symbol->get_location_x(i);
+				relpipe::common::type::Integer y = symbol->get_location_y(i);
+				minX = minX ? std::min(minX, x) : x;
+				minY = minY ? std::min(minY, y) : y;
+				maxX = std::max(maxX, x);
+				maxY = std::max(maxY, y);
 			}
 
+			relpipe::common::type::Integer width = maxX - minX;
+			relpipe::common::type::Integer height = maxY - minY;
 
+			writer->writeAttribute(&minX, typeid (minX));
+			writer->writeAttribute(&minY, typeid (minY));
+			writer->writeAttribute(&width, typeid (width));
+			writer->writeAttribute(&height, typeid (height));
 		}
 
 		image.set_data(nullptr, 0);