Hello, Am Sonntag, den 15.05.2005, 10:50 +0300 schrieb [EMAIL PROTECTED]: > Hi. > In the past, I wrote a program ( in DOS), to display a > signal collected from ADC. I use 2 video pages - 1 is > visible, second is hidden (to draw), and switch they very > fast. The result is very smooth animated graphic. Now i try > to convert my program on Linux. But the picture isn't very > good. The graphic start blinking. Becouse my program is too > large, I write some little example to show my idea: > [code...] > gtk_widget_show_all (window); > > /* set timeout function - 20 times per second */ > handler = g_timeout_add(1000/20, timeout_func, draw_area); >
if you use this function you have to remind some things: (1) you are in a multitasking environment; that means it is not guarantied that the callback function is called every 50ms: it is called in about 50ms +/- some time! (2) your application isn't alone when it communicates with the Xlib. That means a delay in drawing wigdets or bitmaps. It doesn't work "just in time" To solve such a problem your application should be multithreaded and the thread that does the calculation and that thread which does the output should run at priority level "realtime". Then it should work better. Best regards JÃrgen
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