diff -Naur a/src/platformsupport/input/tslib/qtslib.cpp b/src/platformsupport/input/tslib/qtslib.cpp
--- a/src/platformsupport/input/tslib/qtslib.cpp	2017-03-09 13:56:15.106194306 +0900
+++ b/src/platformsupport/input/tslib/qtslib.cpp	2017-03-09 13:55:49.937693339 +0900
@@ -121,12 +121,16 @@
             if (dx*dx <= 4 && dy*dy <= 4 && pressed == m_pressed)
                 continue;
         }
-        QPoint pos(x, y);
+
+        int xn = 900 - y;
+        int yn = x;
+
+        QPoint pos(xn, yn);
 
         QWindowSystemInterface::handleMouseEvent(0, pos, pos, pressed ? Qt::LeftButton : Qt::NoButton);
 
-        m_x = x;
-        m_y = y;
+        m_x = xn;
+        m_y = yn;
         m_pressed = pressed;
     }
 }