Macro

Summary

Binds the elements of a rectangle to four variables, and if the rectangle has a non-zero area, executes a body of code.

Signature

unless-empty-rect-bind ((x
 y
 width
 height
) rectangle
)

                       &body body
 => result

Arguments

x

A variable

y

A variable

width

A variable

height

A variable

rectangle

A rectangle

body

A body of Lisp code

Values

result

The return value of the last form executed in body

Description

The unless-empty-rect-bind macro binds x , y , width , and height to the appropriate values from rectangle and if the width and height are both positive, executes the body forms.