Python For Engineering and Scientific Computing

11.5    The Canvas Drawing Area

The Canvas class reserves an area of a window in which objects such as lines, rectangles, and circles can be displayed.

The constructor of the Canvas class provides a surface with a width of xmax and a height of ymax:

Canvas(width=xmax, height=ymax, bg='white') 

The bg property sets the background color of the drawing area.

11.5.1    Representing Lines

The following method creates lines in the drawing area:

create_line(x1,y1,x2,y2,fill='black',width=3) 

For the representation of a line, two coordinates must be specified: top left x1,y1 and bottom right x2,y2. The fill and width properties set the color and width of the line. Listing 11.6 draws two lines: a horizontal black line in the center of the drawing area ...