#lang racket (require (planet wcy/mpost-wrapper)) (provide main) (define (A-B-C) (values (point 0 0) (point '1cm 0) (point 0 '1cm))) (define (main) (call-with-values A-B-C (lambda (A B C) (fill (op-- A B C 'cycle) #:withcolor (op* 0.8 'white)))))