Tcl/Tk GUIs consist largely of components such as buttons, labels entry boxes and sliders. Sometimes you'll need something that's much more graphic and for this you'll use a canvas widget. You can write to a canvas down to individual pixel level, and you can also draw lines, ovals, rectangles, text and polygons. This module studies the options for drawing to and manipulating a canvas, and introduces computer graphic techniques such as world to pixel co-ordinate transformations and display list manipulation.

This topic is presented on public course Tcl/Tk

can1	drawing on a canvas
can2	Drawing shapes on a canvas and dragging them with the mouse
can3	demo of different graphic objects
can4	Line styles on a Tk canvas
histo	Histogram drawn on a canvas - generalised code
imgoncanvas.tk	Placing a GIF on a canvas
tktext	text options in Tk - colour, font, size, centering

how to use scrollbars for canvas
binding rectangles in tk canvas
Moving object
Using a Tcl/Tk canvas