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

The with-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.