A small utility to test multitouch screen on ultrabooks.
User can draw with finger(s) or use the following keyboard shortcuts:
S - Save screenshot (PNG format)
+ - Increase stroke size
- - Decrease stroke size
C - Clear screen
Esc - Exit app
? - Help
Based on MTScratchpadWMTouch Win7 SDK samples
Tested on windows 8/8.1/10.