### 6.1.1 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 added, e.g.
plotfunc(x2+y2,[x,y],display=red+line_width_3+filled)

- Colors display= or color=
  - 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 display= one of the following value rhombus_point plus_point square_point cross_point triangle_point star_point point_point invisible_point
- Point width: display= one of the following value point_width_n where n is an integer between 1 and 7
- Line thickness: thickness=n or display=line_width_n where n is an integer between 1 and 7 or
- Line shape: display= one of the following values dash_line solid_line dashdot_line dashdotdot_line cap_flat_line cap_square_line cap_round_line
- Legend, value: legend="legendname"; position: display= one of quandrant1 quadrant2 quadrant3 quadrant4 corresponding 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
Input :

polygon(-1,-i,1,2*i,legend="P")

Input :

point(1+i,legend="hello")

Input :

A:=point(1+i);B:=point(-1);display(D:=droite(A,B),hidden_name)

Input :

color(segment(0,1+i),red)

Input :

segment(0,1+i,color=red)