PRESSURE-DEPENDENT PAINT FLOW RATE FOR PAINTBOX-TYPE ELECTRONIC GRAPHICS SYSTEM

摘要

An electronic graphic system (1) comprises a memory (2) for storing data representing an image and a user operable stylus and touch tablet combination (4) by which the user can select a notional painting implement a colour with which to paint and can create data defining positions in the image at which painting is to occur. An address generator (5) is arranged to generate address data identifying addresses in the memory (2) corresponding to the user created position data. The stylus and touch tablet (4) is pressure sensitive and generates a parameter depending on the pressure applied via the stylus by the user. The address generator (5) generates address data at intervals dependent on the instantaneous value of the pressure related parameter. In one embodiment the interval is a distance between identified addresses in the memory (2) and in another embodiment the interval is a period of time. In this way the system simulates an implement having a paint flow rate which is pressure related. The stylus may be connectable to a source of pressurised air and arranged so as to simulate the feel of an airbrush.