> Fox wrote: > > Considering the efficiency. In this case, which widget should I draw on? > > Fl_Box, Fl_Window or others? > > Fl_Box would be a good choice. > > > How can I erase the image step by step, not erase all of it? > > Just draw a big filled rectangle of the same color over the area > you want to erase, and draw your new data into that area. > > > > Which function should I use? > > Set colors with fl_color(), plot points with fl_point(), > draw lines with fl_line(), and for filled rectangles use fl_rectf(). > > If speed of update is essential, and simulating a real scope's > artifacts is secondary or not needed, consider just drawing > using fl_point/fl_line, and use fl_rectf() to erase. > > If you're trying to go all out and replicate things like phosphor > diffusion, antialiased lines, phosphor burn and fade, and speed > is secondary to that, consider drawing into your own ram buffer > and slapping the ram buffer to the screen using fl_draw_image(). > Example: http://seriss.com/people/erco/fltk/#FlDrawImage > > With this you could just plot points wherever you want, and have > a separate routine that passes over the entire image every 1/10th > of a second (using a timer) that halves all the green pixel values, > simulating a phosphor scope's 'fade'. > > Most modern machines should be fast enough for this. And if you're > only plotting green, then you'd only have to fade the green channel, > so you don't have to spend time considering red + blue pixels.
Thanks for your so detailed suggestion. I'll try it. _______________________________________________ fltk mailing list [email protected] http://lists.easysw.com/mailman/listinfo/fltk
