公开(公告)号：CA2012797C

公开(公告)日：1995-01-24

申请号：CA2012797

申请日：1990-03-22

Applicant: IBM

Inventor： BEITEL BRADLEY J ,  HAUGG CHARLES L ,  WALLING LONNIE S ,  YANKER PETER C

IPC: G06F3/14 ,  G06F3/033 ,  G06F3/048 ,  G06T11/80 ,  G09G5/14 ,  G09G5/08

Abstract: VARIABLE SPEED, IMAGE PAN METHOD AND APPARATUS A display apparatus is described having the capability to pan a viewport image across a world-plane image. The viewport image has defined boundaries and exhibits a cursor whose position is movable by a user operated mouse or keyboard controls. The invention comprises a method for providing a variable-rate pan action of the viewport image which includes panning the viewport image at a preset rate in the direction of a first viewport boundary, if the cursor has been moved to the first boundary. The viewport image is panned at a proportionally faster rate in the direction of the first viewport boundary, as the cursor is moved further beyond the first viewport boundary thus enabling a variable speed pan under user control.

公开(公告)号：CA2012797A1

公开(公告)日：1990-12-16

申请号：CA2012797

申请日：1990-03-22

Applicant: IBM

Inventor： BEITEL BRADLEY J ,  HAUGG CHARLES L ,  WALLING LONNIE S ,  YANKER PETER C

IPC: G06F3/14 ,  G06F3/033 ,  G06F3/048 ,  G06T11/80 ,  G09G5/14 ,  G09G5/08