Sampling point generating apparatus
    2.
    发明授权
    Sampling point generating apparatus 失效
    采样点发生装置

    公开(公告)号:US5568601A

    公开(公告)日:1996-10-22

    申请号:US273852

    申请日:1994-07-12

    CPC分类号: G06T11/203

    摘要: A sampling point generating apparatus generates sampling points on an original curve even at gentle slope portions of the original curve and, according to the sampling points, provides a curve that closely approximates the original curve. To accomplish this function, the apparatus has a unit for drawing a straight line between the start and end points of the original curve; a unit for calculating errors between the coordinates of the original curve and the coordinates of the straight line; a unit for detecting extremal value points, where increase or decrease in the errors is reversed, according to the errors; and a unit for generating intermediate points among the extremal value points. The extremal value points and intermediate points are used as sampling points to provide a cubic curve that closely approximates the original curve.

    摘要翻译: 采样点产生装置即使在原始曲线的平缓的倾斜部分也能在原始曲线上产生采样点,并且根据采样点提供一个接近原始曲线的曲线。 为了实现该功能,该装置具有用于在原始曲线的起点和终点之间绘制直线的单元; 用于计算原始曲线的坐标与直线坐标之间的误差的单元; 根据错误,检测极值点的单位,其中误差的增减反转; 以及在极值点之间产生中间点的单元。 将极值点和中间点用作采样点,以提供与原始曲线近似的三次曲线。

    Outline font expanding method and outline font expanding device
    3.
    发明授权
    Outline font expanding method and outline font expanding device 失效
    字体扩展方法和轮廓字体扩展装置

    公开(公告)号:US5754164A

    公开(公告)日:1998-05-19

    申请号:US399579

    申请日:1995-03-07

    CPC分类号: G09G5/24 G06T11/40 G09G5/26

    摘要: The present invention relates to an outline font expanding method and an outline font expanding device each of which can reproduce faithfully the line width of an original outline font. The coordinate system for vector data is defined on the boundaries between dots to create an outline font on the boundaries. The number of dots in the main scanning direction is calculated as a unit change when the outline font is moved by one dot in the secondary scanning direction. A value obtained by dividing the unit change by 2 is added to the coordinate in the main scanning direction of the outline font. while the scanning line is moved dot by dot in the main scanning direction, the intersection of the scanning line and the outline font is obtained at each move position. Thus, the filling range over the scanning line is defined in the main scanning direction. This invention is applicable to a method which fills the inside of an outline font drawn, based on vector data and then forms a dot pattern of a character, symbol, graph, or the like.

    摘要翻译: 本发明涉及一种轮廓字体展开方法和轮廓字体扩展装置,它们可以忠实地再现原始轮廓字体的线宽。 向量数据的坐标系定义在点之间的边界上,以在边界上创建轮廓字体。 当轮廓字体在副扫描方向上移动一个点时,主扫描方向上的点数被计算为单位变化。 通过将单位变化除以2而获得的值被添加到轮廓字体的主扫描方向上的坐标。 扫描线在主扫描方向上逐点移动时,在每个移动位置处获得扫描线和轮廓字体的交点。 因此,扫描线上的填充范围被限定在主扫描方向上。 本发明适用于基于向量数据填充绘制的轮廓字体的内部的方法,然后形成字符,符号,图形等的点图案。