Dynamic Optical Scaling and Variable-Sized Characters

Abstract

Picture A specific language, called P language, is used to describe presentation rules for each type of element defined in the DTD. Interpretation of these presentation rules is based on the concept of abstract pictures [27]. When Grif has a document to print or to display in a window, it first builds an abstract picture which is a high-level description of that document image. This description is device-independent and allows the editor to update the image dynamically in a simple way. In a second step, it translates this abstract picture into the real image which is displayed on the screen or printed on paper sheets. The abstract picture is the interaction support between the application and the user. An abstract picture is a hierarchy of abstract boxes, the concept of box being the rectangle which delimits a document element as defined in T E X [16]. In an abstract picture, boxes are organized as a tree, where each node is a box which encloses all its children. These boxes are terme..