Linux under the ARM Coretex A7, Qt 5.9, QML do interface,
Need according to geodetic coordinates or latitude and longitude describe the walking path, minimum error 20 cm,
Currently in use is QQuickPaintedItem embedded in QML,

Problem a: such as draw the area covered by an object moving trajectory, each update will start from scratch when positioning re-paint, how don't have to redraw increment directly?

Question 2: is there a way to GPU graphics,,,,