Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Reexamination Certificate
1999-08-13
2001-08-07
Luu, Matthew (Department: 2672)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
C345S215000
Reexamination Certificate
active
06271824
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a computer system, and more particularly, to a scroll method of a computer system.
2. Description of the Prior Art
Window-based operating systems are commonly used in computer systems for editing and browsing documents. In a window-based operating system, a document is displayed in an image frame which is contained in a window, and the window is displayed in a monitor of a computer system. However, the image frame often cannot display the document in full because the display area of the image frame has a limited size. In order to view a hidden portion of the document below the image frame, a user has to move the cursor to a down arrow of a vertical scroll bar, and click on one of the buttons of a mouse. Once the button is clicked, the document will move upward line-by-line. Vice versa, if the button is clicked when the cursor is positioned on an up arrow of the vertical scroll bar, the document will move downward line-by-line.
In computer programming, the command for scrolling is SendMessage(hWnd, WH_VSCROLL, SB_LINEUP, NULL). The parameter which causes the line movement is SB_LINEUP. The line movement is very disturbing for the user, thus research has been focusing on more comforting means to scroll the document.
SUMMARY OF THE INVENTION
It is therefore a primary objective of the present invention to provide a scroll method of a computer system to solve the above mentioned problem.
In a preferred embodiment, the present invention provides an image scrolling system for scrolling an image frame contained in a window which is displayed in a monitor of the system, the system comprising:
a memory for storing programs and data;
a processor for executing the programs stored in the memory;
an input device electrically connected to the processor having a scrolling signal generator for generating scrolling signals to control the scrolling of the image frame in the window;
an operating system stored in the memory for controlling operations of the image scrolling system, the operating system comprising a display control program for controlling the display of the window in the monitor;
an application program stored in the memory and executed under the operating system for controlling the scrolling of the image frame within the window by using the display control program;
an input device driver stored in the memory and executed under the operating system for receiving and processing the scrolling signals from the input device and transmitting the processed scrolling signals to the application program to control the scrolling of the image frame within the window;
wherein the input device driver converts each of the scrolling signals into a corresponding displacement vector, adds the displacement vector with a current coordinate of the image frame displayed within the window to obtain a next coordinate, and transmits the next coordinate to the application program so as to scroll the image frame to the next coordinate.
It is an advantage of the present invention that the scrolling of the image frame can be performed smoothly so that the scrolling will no longer cause visual discomforts.
This and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after having read the following detailed description of the preferred embodiment which is illustrated in the various figures and drawings.
REFERENCES:
patent: 5862381 (1999-01-01), Advani et al.
Hsu Winston
Luu Matthew
Primax Electronics Ltd.
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