CLIM 2 User Guide

polygon-points
Arguments: polygon
■ Returns a sequence of points that specify the segments in polygon.
map-over-polygon-coordinates
Arguments: function polygon
[Generic function]
[Generic function]
■ Applies function to all of the coordinates of the vertices of polygon. The function takes
two arguments, the x and y coordinates.
map-over-polygon-segments
Arguments: function polygon
[Generic function]
■ Applies function to the line segments that compose polygon. The function takes four
arguments, the x and y coordinates of the start of the line segment, and the x and y coordinates of the
end of the line segment.
■ When map-over-polygon-segments is called on a closed polyline, it will call function
on the line segment that connects the last point back to the first point.
3.6.5 Lines in CLIM
A line is a special case of a polyline that has only a single segment. The functions for making and dealing
with line are the following:
line
[Class]
■ The protocol class that corresponds to a mathematical line-segment, that is, a polyline with only
a single segment. This is a subclass of polyline. If you want to create a new class that obeys the
line protocol, it must be a subclass of line.
standard-line
[Class]
■ A class that implements a line. This is a subclass of line. This is the class that make-line and
make-line* instantiate.
make-line
Arguments:
start-point end-point
[Function]
■ Makes an object of class standard-line that connects start-point to end-point.
make-line*
Arguments: start-x start-y end-x end-y
[Function]
■ Makes an object of class standard-line that connects (start-x, start-y) to(end-x,
end-y).
line-start-point
Arguments: line
■ Returns the starting point of line.
line-end-point
Arguments: line
■ Returns the ending point of line.
[Generic function]
[Generic function]
48 CLIM 2.2 User Guide