how can enhace the refresh of PtRaw, 3x!

dxwang · January 23, 2008, 1:11am

the os is qnx630sp3.
we use PtRaw to draw some data. if there is a dialog on the front of the ptraw and we move it sometimes, then the ptraw will refresh some regions automatically. so it will need some time for it . and some other mouse operation of button will can not respond immediately.
we think if there is some good way to reduce the time of refresh. I have seen the chapter of Raw Drawing and Animation. but I don’t know how to do it .

3x

qnxloader · January 23, 2008, 11:00am

Draw to offscreen context. In PtRaw blit this context to screen.

maschoen · January 23, 2008, 4:58pm

Is this what the double buffer widget does?

mario · January 23, 2008, 4:59pm

If the mouse operation does not respond that means you PtRaw draw function takes too much time. It will be faster if you do it in offscreen context mode, but I don’t think that will solve your problem.

You may have to rework your draw function.