2 GP Reference Entries

with-transformed-area

Macro

Summary
: Transforms a rectangle using a port's transform, and binds the resulting values to a variable across the evaluation of the macro's body.
Signature

with-transformed-area (points port left top right bottom)
                      &body body

Arguments

points: A variable
port: A graphics port
left: A real number
top: A real number
right: A real number
bottom: A real number
body: A body of Lisp code

Values

result: The return value of the last form executed in body

Description

Thewith-transformed-area macro transforms a rectangle, binding the resulting four corner points to points for the duration of body. The left top right bottom values represent a rectangular area bounded by four points. The four points are transformed by the port's transform and the list of eight values (alternating x and y values for four points) bound to the points variable for the duration of the macro body.