The package provides picture-mode environments whose size is related to the size of the page. The fullpict environment takes arguments to specify the dimension of the picture in picture mode ‘unit lengths’; the value for \unitlength is defined by the fact that the picture is to be 90% of \textwidth. Similar environments halfpict (half the width of fullpict), and scalepict (a given percentage of the width of fullpict), are also defined.