- make-canvas COLUMNS ROWS #!optional WIDTH HEIGHTprocedure
Creates a character canvas with a physical size of COLUMNS X ROWS characters. The virtual size of the canvas is WIDTH X HEIGHT "pixels".
"Real coordinates" relate to the physical size of the canvas. "Virtual coordinates" are translated to real coordinates by scaling. Both types of coordinates are specified in X/Y notation.
The origin 0/0 is at the lower left corner of the canvas. The new canvas will be filled with blanks initially.