8.3.1  Individual attributes

Graphic attributes are optional arguments of the form display=value. They must be given as the last argument of a graphic instruction. Attributes are ordered in several categories: color, point shape, point width, line style, line thickness, legend value, position and presence. In addition, surfaces may be filled or not, 3-d surfaces may be filled with a texture, 3-d objects may also have properties with respect to the light. Attributes of different categories may be combined with +, e.g.
plotfunc(x²+y²,[x,y],display=red+line_width_3+filled)

The graphic attributes are:

• Colors, set with display=value or color=value. The values can be:
  • black, white, red, blue, green, magenta, cyan, yellow,
  • a numeric value between 0 and 255,
  • a numeric value between 256 and 256+7*16+14 for a color of the rainbow,
  • any other numeric value smaller than 65535, the rendering is not guaranteed to be portable.
• Point shapes, set with display=value. The values can be:
  • rhombus_point plus_point
  • square_point cross_point
  • triangle_point
  • star_point
  • point_point
  • invisible_point
  • Point width, set with display=value. The values can be:
    point_width_n where n is an integer between 1 and 7.
  • Line thickness, set with thickness=n or display=line_width_n where n is an integer between 1 and 7.
  • Line shape, set with display=value. The values can be:
    • dash_line
    • solid_line
    • dashdot_line
    • dashdotdot_line
    • cap_flat_line
    • cap_square_line
    • cap_round_line
  • Legend, the text is set with legend="legendname"; the position is set with display=value, where the values can be:
    • quadrant1
    • quadrant2
    • quadrant3
    • quadrant4
    and correspond to the position of the legend of the object (using the trigonometric plane conventions). The legend is not displayed if the attribute display=hidden_name is added.
  • display=filled specifies that surfaces will be filled,
  • gl_texture="picture_filename" is used to fill a surface with a texture. Cf. the interface manual for a more complete description and for gl_material= options.

  
  

  Examples.
  (See Section 13.10.3, Section 13.6.2, Section 13.3.3 and Section 13.7.3 for information on the commands used.)

  • Input:
    polygon(-1,-i,1,2*i,legend="P")
    Output:
    
  • Input:
    point(1+i,legend="hello")
    Output:
    
  • Input:
    color(segment(0,1+i),red)
    Output:
    
  • Input:
    segment(0,1+i,color=red)
    Output:
    

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