Hi, On 7/26/05, Przemysław Więckowski <[EMAIL PROTECTED]> wrote: > i'm trying write DAQ/Visualisation application using GTk2.x, but i'm > little confused , because i can't obtain satisfied efficiency. I written > sample code to check this usig signals : > > "motion_notify_event" to obtain mouse movement and position, and next i > emit "configure_event" where:
Cripes, yes, that will be slow. I think would restructure like this: - Have something running (perhaps in a thread) which captures your new data every 50ms. Use it to update your internal model of what the screen should look like (perhaps an array of x/y positions that should be drawn). - Whenever a new version of the model is available, call gtk_widget_queue_draw() on your drawing area. This will not do any drawing, it will just queue a draw request. - In your expose handler, redraw the whole screen. Don't allocate any pixmaps or anything like that, just draw directly. gtk will do double buffering for you automatically. Don't do anything in configure either (except perhaps record the size of the window I guess, if you want to rescale the display as the window resizes). - As a possible optimisation (only do this if you have performance problems), only repaint the lines / rectangles etc. in the exposed area John
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