nroundpage.ps

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

%
% A version of roundpage.ps that assumes a symmetric clipping path. Thanks
% to Matthijs Melchior for the suggestion.
%

/roundpagebbox {
	pagebbox dup 0 get pagebbox 2 get add 2 exch put
	pagebbox dup 1 get pagebbox 3 get add 3 exch put
	pagebbox 0 0 put
	pagebbox 1 0 put
} bind def