Python in a Nutshell

Name

create_line

Synopsis

                        c.create_line(*coordinates, **line_options)

Creates a line item with vertices at the given coordinates and returns the item’s handle. coordinates must be an even number of positional parameters, alternately x and y values for each vertex of the line. Canvas coordinates, by default, are in pixels, with the origin (coordinates 0,0) in the upper left corner, the x coordinate growing rightward, and the y coordinate growing downward. You may set different coordinate systems on c, but I do not cover these possibilities in this book. line_options may include:

arrow

Sets which ends of the line have arrow heads; may be NONE (default), FIRST, LAST, or BOTH

fill

The line’s color (default is black)

smooth

If true, the line is drawn as a smooth curve (a B-spline); otherwise (default), the line is drawn as a polygonal (a sequence of line segments)

tags

A string (to assign a single tag to this item) or a tuple of strings (to assign multiple tags to this item)

width

Width of the line in pixels (default 1)

For example:

                        x=c.create_line(0,150, 50,100, 0,50, 50,0 smooth=1)

draws a somewhat S-like curve on c, and binds the curve’s handle to variable x. You can then change the curve’s color to blue with:

                        c.itemconfig(x,fill='blue')