Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1984-10-24
1987-03-31
Brigance, Gerald L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340724, G09G 106
Patent
active
046546510
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to an image display method; and more particularly, to an image display method whereby an image to be depicted on the display screen of a CRT (cathode-ray tube) is enlarged or reduced for full display.
Graphic display units are in use everywhere as means for implementing CAD/CAM (computed aided design and computer aided manufacturing). For example, a graphic display unit may be utilized effectively as means for checking an NC machining program by instantaneously displaying the tool trajectory of an NC machine tool or the like or the shape to machined. When an image is to be displayed by a graphic display unit of this kind, it is essential that the unit have a function for displaying the image on the CRT display screen in full following enlargement or reduction.
With conventional methods, however, the image to be presented cannot be displayed in full on the display screen through a simple operation following enlargement or reduction.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an image display method whereby an image to be presented can be displayed in full on a display screen through a simple operation.
Another object of the present invention is to provide an image display method whereby an image to be presented can be displayed in full on a display screen following enlargement or reduction merely by entering horizontal and vertical dimensions of the image and specifying the starting point of the image on the display screen.
The present invention provides an image display method whereby an image to be presented can be displayed in full on a CRT display screen following enlargement or reduction by entering a horizontal dimension L.sub.x and a vertical dimension L.sub.y of the image to be presented; obtaining a magnification K by using lengths B.sub.x, B.sub.y in the horizontal and vertical directions of the display screen as well as the dimensions L.sub.x, L.sub.y ; obtaining the starting point coordinates (X.sub.s, Y.sub.s) of the image to be presented following multiplication thereof by K; obtaining the starting point coordinates (X.sub.s ', Y.sub.s ') of the image on the display screen by positioning a cursor at the starting point of the image on the display screen; obtaining shift quantities S.sub.x, S.sub.y in the horizontal and vertical directions by using (X.sub.s, Y.sub.s) and (X.sub.s ', Y.sub.s '); and displaying the image on the CRT screen by using the magnification and the shift quantities. According to the present invention, an image to be presented can be displayed on a display screen in full following enlargement or reduction merely by entering the horizontal and vertical dimensions of the image and specifying the starting point of the image to be depicted on the display screen.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 and 2 are schematic views for illustrating the image display method according to the present invention;
FIG. 3 is a flowchart of the image display method according to the present invention; and
FIG. 4 is a block diagram of circuitry for practicing the image display method according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
FIGS. 1 and 2 are schematic views for illustrating the image display method according to the present invention. In the Figures, DFS represents the CRT screen (display screen) of a graphic display unit, RP denotes the origin, having coordinates (O,O), of an image to be presented, BRP designates the origin, having coordinates (O.sub.x,O.sub.y), of the display screen of the CRT, IMG represents the graphic image to be presented, and DS stands for the starting point of the graphic image to be presented.
Let us assume that the graphic image to be presented is to be displayed in full on the display screen DFS. According to the present invention, this is carried out by enlarging or reducing the graphic image IMG by applying a suitable magnification; shifting the enlarged or reduced graphic image IMG' by suitable amounts in the horizontal and vertical dir
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patent: 4543571 (1985-09-01), Bilbrey et al.
patent: 4546349 (1985-10-01), Prohofsky et al.
Kishi Hajimu
Takegahara Takashi
Tanaka Kunio
Brigance Gerald L.
Fanuc Ltd
Kovalick Vincent P.
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