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1. 发明授权

US5818460A Method for performing polygon set operations on polygonal regions 失效
标题翻译：在多边形区域上执行多边形集合操作的方法
公开(公告)号：US5818460A
公开(公告)日：1998-10-06
申请号：US855713
申请日：1997-05-08
申请人： Robert D. Covey , Ching-Chi Billy Hsu
发明人： Robert D. Covey , Ching-Chi Billy Hsu
IPC分类号： G06T11/40 , G06F15/00
CPC分类号： G06T11/40
摘要： A method, apparatus, and article of manufacture for performing a polygon set operation on two or more polygons. A trace direction is determined based on the polygonal set operation, and an initial intersection point between first and second polygons is selected. The perimeter of either the first or second polygons is traced beginning from the selected intersection point and continuing in the determined trace direction. The trace switches between the perimeters of the first and second polygons as additional intersection points are reached during the tracing. The tracing is terminated when the selected intersection point is encountered by the tracing step. These steps are then repeated until all intersection points between the first and second polygons have been encountered.
摘要翻译：一种在两个或多个多边形上执行多边形集合操作的方法，装置和制品。基于多边形集合操作来确定轨迹方向，并且选择第一和第二多边形之间的初始交点。从所选交叉点开始追踪第一或第二多边形的周边，并以确定的轨迹方向继续。在跟踪过程中到达第一和第二个多边形的周长之间的跟踪，作为附加的交点。当跟踪步骤遇到所选交叉点时，跟踪终止。然后重复这些步骤，直到遇到第一和第二个多边形之间的所有交点。

2. 发明授权

US6111587A Method for converting non-zero winding to even-odd fill polygons 失效
标题翻译：将非零绕组转换为奇数填充多边形的方法
公开(公告)号：US6111587A
公开(公告)日：2000-08-29
申请号：US967621
申请日：1997-11-12
申请人： Robert D. Covey , Ching-Chi Billy Hsu
发明人： Robert D. Covey , Ching-Chi Billy Hsu
IPC分类号： G06T11/40 , G06T11/80
CPC分类号： G06T11/40
摘要： The present invention discloses a method, apparatus, and article of manufacture for converting Non-Zero Winding to Even-Odd rule polygons, regardless of their shapes. Convex, concave, self-intersecting, and polygons with holes can all be converted from Non-Zero Winding to Even-Odd fill rule polygons. The invention accepts Non-Zero Winding fill polygons and computes all intersection points between the polygons. An initial intersection point between a first polygon and a second polygon is selected. The perimeter of either the first or second polygon is traced beginning from the selected intersection point. The trace switches between the perimeters of the first and second polygons as additional intersection points are reached during the tracing. The tracing is terminated when the selected intersection point is encountered by the tracing step. These steps are then repeated until all intersection points between the first and second polygons have been encountered.
摘要翻译：本发明公开了一种用于将非零绕组转换为偶数奇数规则多边形的方法，装置和制品，而不管其形状如何。凸，凹，自相交，以及具有孔的多边形都可以从非零绕组转换为偶奇数填充规则多边形。本发明接受非零绕组填充多边形并计算多边形之间的所有交点。选择第一多边形和第二多边形之间的初始交点。第一或第二多边形的边界从所选交叉点开始追踪。在跟踪过程中到达第一和第二个多边形的周长之间的跟踪，作为附加的交点。当跟踪步骤遇到所选交叉点时，跟踪终止。然后重复这些步骤，直到遇到第一和第二个多边形之间的所有交点。

3. 发明授权

US5990911A Immediate mode drawing interface for the construction of graphics software 失效
标题翻译：即时模式绘图界面，用于构建图形软件
公开(公告)号：US5990911A
公开(公告)日：1999-11-23
申请号：US970959
申请日：1997-11-14
申请人： Matthew R. Arrott , Robert D. Covey , Ching-Chi Billy Hsu , Tanvir B. Hassan , Jeffrey M. Kowalski , Brian P. Mathews
发明人： Matthew R. Arrott , Robert D. Covey , Ching-Chi Billy Hsu , Tanvir B. Hassan , Jeffrey M. Kowalski , Brian P. Mathews
IPC分类号： G06T1/00 , G06T15/40 , G06T1/20
CPC分类号： G06T15/405 , G06T1/00
摘要： The present invention discloses an apparatus, method, and article of manufacture for generating graphic images. In accordance with the present invention, an application program receives commands from a computer user via an input device and provides an output command stream to a plurality of renderer programs. The renderer programs selectively modify the output command stream and transmit the output command stream to a graphics peripheral device or to one or more of the other renderer programs.
摘要翻译：本发明公开了一种用于生成图形图像的装置，方法和制品。根据本发明，应用程序经由输入设备从计算机用户接收命令，并向多个渲染器程序提供输出命令流。渲染器程序选择性地修改输出命令流并将输出命令流传输到图形外围设备或一个或多个其他渲染器程序。

4. 发明授权

US5982399A Immediate mode drawing interface for the construction of graphics software 失效
标题翻译：即时模式绘图界面，用于构建图形软件
公开(公告)号：US5982399A
公开(公告)日：1999-11-09
申请号：US826339
申请日：1997-03-26
申请人： Robert T. Scully , Ching-Chi Billy Hsu , Robert D. Covey
发明人： Robert T. Scully , Ching-Chi Billy Hsu , Robert D. Covey
IPC分类号： G06T1/00 , G06T15/40 , G06F15/00
CPC分类号： G06T1/00 , G06T15/405
摘要： An apparatus, method, and article of manufacture for providing compatibility between an application program and a renderer executing on a computer. An application program, executed by the computer, receives commands from a user via the input device and generates an output command stream in response thereto, wherein the output command stream comprises one or more instructions for generating the graphic images. A version renderer program, executed by the computer and coupled to the application program, translates the output command stream received from the application program into a renderer command stream. One or more renderer programs, executed by the computer and coupled to the version renderer program, receive the renderer command stream from the version renderer program, selectively modify the renderer command stream, and selectively transmit the renderer command stream to the graphics peripheral device or to one or more of the other renderer programs.
摘要翻译：一种用于提供应用程序和在计算机上执行的渲染器之间的兼容性的装置，方法和制品。由计算机执行的应用程序经由输入设备从用户接收命令并响应于此产生输出命令流，其中输出命令流包括用于生成图形图像的一个或多个指令。由计算机执行并耦合到应用程序的版本渲染器程序将从应用程序接收的输出命令流转换为渲染器命令流。由计算机执行并耦合到版本渲染器程序的一个或多个渲染器程序从版本渲染器程序接收渲染器命令流，选择性地修改渲染器命令流，并且有选择地将渲染器命令流传输到图形外围设备或者一个或多个其他渲染程序。

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