公开(公告)号：JPH06309466A

公开(公告)日：1994-11-04

申请号：JP13384093

申请日：1993-05-12

Applicant: APPLE COMPUTER

Inventor： KIYARII KURAAKU

IPC: G06T11/20 ,  G06T3/00 ,  G06T11/00 ,  G06F15/72

Abstract: PURPOSE: To obtain the device and method for effectively generating and operating a graphical image to be displayed on an output device of a computer. CONSTITUTION: All graphical images are maintained as single base geometry on which every possible geometric operation is imposed. Simplified geometry is called a shape and shapes are put together to obtain an object called a picture. Geometric operation is done at any time for geometry in a local space and those operation results are drawn whatever display device is used in a layer for a hierarchical output method. A cache is maintained for geometry calculation, so the calculation needs to be done only once irrelevantly to the resolution of an output display and geometric information is never lost as a result of a bit map process.