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.

Package

graphics-ports

Signature

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

Arguments

Values

Description

The macro with-transformed-area uses port's transform to transform a rectangle specified by left, top, right AND bottom. Then points is bound to the resulting list of eight values (alternating x and y values for four corner points) while the forms of body are evaluated as an implicit progn.