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    • 2. 发明授权
    • Tabulating system
    • 制表系统
    • US4728945A
    • 1988-03-01
    • US736879
    • 1985-05-22
    • Masako Kojima
    • Masako Kojima
    • G06F3/14G06F3/153G06F17/21G06F17/24G06T11/60G09G1/00G09G1/14G09G5/32
    • G09G1/00G06F17/245G09G1/143
    • The described embodiment provides listing control on a cathode ray tube (CRT) display for simultaneously drawing horizontal and vertical grid lines within a square box displayed on the CRT screen by moving a cursor to the intersection point of these grid lines and by pressing an ENTER key.The embodiment uses a current position counter, a starting point counter and ending point counter to selectively set flag bits for horizontal and vertical grid lines stored in a logical page buffer so that the horizontal and vertical grid lines passing through the intersection point can be simultaneously displayed on the CRT screen. The embodiment uses the counters to define two end points on a diagonal line of the square box and to define the intersection point within the square box, whereby the flag bits are selectively set in accordance with the contents of these counters.
    • 所描述的实施例提供了对阴极射线管(CRT)显示器的列表控制,用于通过将光标移动到这些网格线的交点并通过按ENTER键在CRT屏幕上显示的方框内同时绘制水平和垂直网格线 。 该实施例使用当前位置计数器,起始点计数器和结束点计数器来选择性地设置存储在逻辑页面缓冲器中的水平和垂直网格线的标志位,使得可以同时显示穿过该交点的水平和垂直网格线 在CRT屏幕上。 该实施例使用计数器来定义方框的对角线上的两个端点,并且在方框内定义交点,由此根据这些计数器的内容选择性地设置标志位。