Topic       : The GFA-Basic Compendium
Author      : GFA Systemtechnik GmbH
Version     : GFABasic.HYP v2.98 (12/31/2023)
Subject     : Documentation/Programming
Nodes       : 899
Index Size  : 28056
HCP-Version : 3
Compiled on : Atari
@charset    : atarist
@lang       : 
@default    : Document not found
@help       : Help
@options    : +g -i -s +z
@width      : 75
@hostname   : STRNGSRV
@hostname   : CAB     
@hostname   : HIGHWIRE
@hostname   : THING   
View Ref-FileDEFMARK [color],[type],[height]

color, type, height: iexp

DEFMARK determines the color, type, and height of the marks, at the corner
points of a polygon, which are displayed by the command POLYMARK. According to
the actual screen resolution, values between 0 and 255 can be assigned to the
numerical expression 'color' (see the start of this chapter). The 'type'
parameter gives the following corner marks:

    Type  Description  Output
    1     Dot              (single pixel)
    2     Plus
    3     Star
    4     Square
    5     Cross
    6     Diamond

Values larger than 6 result in the use of the star as the corner mark. Values
for the 'height' of the shape are specified in pixels. Thus a value of 8 will
produce a mark that is 8 x 8 pixels in height. When only the second parameter
or third parameter of the command are required, one can omit the parameter in
question and enter only the parameter-separating commas. Thus,

    DEFMARK ,,4

means that the first two parameters keep their current value and the height of
the marks is set to 4.

Example:

    DIM x%(1),y%(1)
    x%(0)=50
    y%(0)=50
    x%(1)=150
    y%(1)=150
    DEFMARK 1,4,2
    POLYMARK 2,x%(),y%()
    DEFMARK ,3,4
    POLYMARK 2,x%(),y%() OFFSET 100,0

--> This draws two pairs of points with different corner marks.

    VDI calls:
    DEFMARK vsm_color(),vsm_type(),vsm_height()

Memo:
      Editor accepts DEFMARK with no parameters. Has no effect.
        Generates no code compiled.

vsm_color()+, vsm_type()+, vsm_height()+