On 09/19/10 09:39, ALAN GAULD wrote: >> It appears that the Tk canvas widget does not support simply plotting > a pixel. > > Correct, and I agree it seems odd, but in practice drawing either lines or > ovals of one-pixel do the equivalent job - albeit a little more slowly.
More slowly and takes huge amount of memory. A single Tk canvas object takes at least 14 words (= 114 bytes in 64-bit OS = 56 bytes in 32-bit OS) + the amount of data is needed to store the `kind of object`. That's much larger than the ideal 3 bytes per pixel (or 4 bytes with alpha). Tkinter's Canvas intentionally doesn't provide create_pixel() because unlike most other Canvas implementations, Tkinter's Canvas holds a stateful canvas objects instead of a simple drawing surface. Providing a create_pixel() will be too tempting for abuse, which would make the canvas unbearably slow and memory consuming. In short, Canvas is not designed for pixel drawing. > Digging a little deeper it seems the idiomatic way to do this in Python > is to use PIL the Python Imaging Library to create a GIF or bitmap > image and then insert that into Tkinters cancvas as an image object. > > The Pil ImageDraw class has a point() ethod If you need to plot pixels, do use pygame, PIL, or at least the PhotoImage trick. _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
