CGM and CGI

A value of abstract indicates that the implementation can treat the widths specified as relative values and can normalize them to any suitable widths that maintain the approximate ratios specified for lines and gaps. A value of VDC means that the hatching transforms with segment tranform and anisotropic tranforms (as if the hatching were made up of DISJOINT POLYLINE elements); otherwise, the hatching is like "wallpaper" that shows through a polygon-shaped hole--everything is specified in device units and hatching is done in device space. The angle parameter is specified as the x and y components of a vector. The angle is measured between the positive x -axis of the appropriate coordinate system and the vector provided.

[1]  David A. Duce,et al.  Introduction to the Graphical Kernel System (GKS) (2nd ed. revised for international standard) , 1986 .

[2]  David B. Arnold,et al.  GKS Programming in a PHIGS Environment , 1985, Comput. Graph. Forum.

[3]  David B. Arnold,et al.  An Approach to the Formal Specification of Configurable Models of Graphics Systems , 1987, Eurographics.

[4]  David F. Rogers,et al.  Procedural Elements for Computer Graphics , 1984 .

[5]  Thomas Powers,et al.  The Computer Graphics Virtual Device Interface , 1986, IEEE Computer Graphics and Applications.

[6]  Mel Slater,et al.  Computer graphics: systems & concepts , 1987 .

[7]  David B. Arnold.  The Importance of a Correct Approach to the Design of Metafiles Standards , 1982, Eurographics.

[8]  Peter R. Bono.  A Survey of Graphics Standards and Their Role in Information Interchange , 1985, Computer.

[9]  Mark Skall.  NBS's Role in Computer Graphics Standards , 1986, IEEE Computer Graphics and Applications.

[10]  David F. Rogers,et al.  Mathematical elements for computer graphics , 1976 .

[11]  David Bailey,et al.  PHIGS: A Standard, Dynamic, Interactive Graphics Interface , 1986, IEEE Computer Graphics and Applications.

[12]  Lofton Henderson,et al.  The Computer Graphics Metafile , 1986, IEEE Computer Graphics and Applications.

[13]  Richard Puk,et al.  GKS-3D: A Three-Dimensional Extension to the Graphical Kernel System , 1986, IEEE Computer Graphics and Applications.

[14]  Jack Bresenham,et al.  Ambiguities in Incremental Line Rastering , 1987, IEEE Computer Graphics and Applications.

[15]  David B. Arnold,et al.  The use of Modularity and Configurability in the Comparison of Graphics Systems Designs , 1988 .

[16]  David B. Arnold,et al.  The Computer Graphics Interface , 1988 .

[17]  David Arnold,et al.  The requirement for process structured graphics systems , 1981, COMG.