4 Drawing
4.1 Drawing Commands
A drawing command is either a single or a multiple drawing statement. A single
drawing statement consists in the draw
keyword followed by a drawable
object and a possibly empty comma separated list of aspect parameters.
Example: draw point(2, 3) red
A multiple drawing statement consists in the draw
keyword followed by a
list of global aspect parameters and a list of drawable objects (with possibly
local aspect parameters) delimited by end
.
Example:
draw blue
A.B
C.D dashed, black
E.F dotted
end
Local parameters override global ones.
Aspect parameters
- Color
black
(default), darkgray
, gray
, lightgray
,
white
, red
, green
, blue
, cyan
,
magenta
, yellow
.
- Scale factor
- A number greater than 0 (default: 1).
- Point shape
dot
(default), disc
, box
, plus
, cross
.
- Line style
full
(default), dashed
, dotted
.
- Partition
entire
(default), half
.
- Direction
forth
(default), back
.
- Endings
none
(default), arrow
, arrows
.
- Conics draw step
- An angular parameter (default: 3°) setting the current drawing step
(with respect of the parametric representation).
- Font
font(
s)
where s is a string containing the font description.
Font description
With eukleides the font description string has to follow the standard
PostScript format, i.e. "
name-
face-
size"
.
Example: "Helvetica-Bold-12"
The default font is "NewCenturySchlbk-Roman-10"
.
With euktopst the font description string should be a sequence of
parameterless commands (without the leading backslash) appropriate to the TeX
format in use, e.g. "bf"
with plain TeX or "sffamily\bfseries"
with LaTeX.
Single drawing statements
draw A
list- Draws point A, where list may contain color, scale and shape
parameters.
draw v O
list- Draws vector v from point O, where list may contain color,
scale and style parameters. The scale factor determines the line thickness.
draw s
list- Draws the open path corresponding to set s, where list may contain
color, scale, style, direction and endings parameters.
draw (s)
list- Draws the polygon corresponding to set s, where list may contain
color, scale, style, direction and endings parameters.
draw [s] {
color }
- Fills the polygon corresponding to set s.
draw [s] a
list- Hatches the polygon corresponding to set s, where list may contain
color and scale parameters. The angular parameter a determines the
direction of the hatches. The scale factor determines the spacing of the
hatches (default: 1.5 mm).
draw l
list- Draws line l where list may contain color, scale, style, partition
and direction parameters. Using
half
yields the ray having same origin
and direction than line l, using both half
and back
yields
the ray with reverse direction.
draw c
list- Draws circle c where list may contain color, scale and style
parameters.
draw c a b
list- Draws arc of circle c from polar angle a to polar angle b
(with respect to the center of c) where list may contain color,
scale, style, direction and endings parameters.
draw [c] {
color }
- Fills circle c.
draw [c] a
list- Hatches circle c where list may contain color and scale
parameters. The angular parameter a determines the direction of the
hatches. The scale factor determines the spacing of the hatches (default: 1.5 mm).
draw c
list- Draws conic c where list may contain color, scale, style and step
parameters.
draw c a b
list- Draws conic c from argument a to argument b (with respect
to the parametric representation of c) where list may contain
color, scale, style, direction, endings and step parameters.
draw l A a
list- Writes string l with respect to point A in direction a,
where list may contain color, scale and font parameters. The scale factor
determines the distance from the center of the string to the point.
draw l s a
list- Writes string l with respect to the middle of segment s in
direction a, where list may contain color, scale and font
parameters. The scale factor determines the distance from the center of the
string to the middle of the segment (default: 3 mm).
Output setting commands
scale z
- Sets the value of the length unit. (Default: 1 cm.)
box x, y, x', y' { , z }
frame x, y, x', y' { , z }
- Sets the coordinates of the lower left and upper right corner of the drawing
frame, with optional scale factor z. Default coordinates are
(-2, -2) and (8, 6). With eukleides and
euktopst, both commands yield the same result.