Am 23.10.2016 um 07:39 schrieb Waldek Hebisch:
>
> BTW1: AFAICS C part can handle all RGB values, and it would be
> good to get of limitation on number of colors on Spad side.
>
Would be nice to have, but certainly not pressing?
> BTW2: At least one part of C code for graphis cleverly uses
> X windows routines for color handling. The effect is that
> it is impossible to produce Postscript images without connection
> to X server :(
>
Yes, that's a pity, however, it looks like that there are work-arounds without
to endanger current functionality.
BTW in "draw.spad" there's something strange with the creation of defaults for
'title' and 'style'.
draw : (PPC, BIND, L DROP) -> VIEW2
++ draw(curve(f(t), g(t)), t = a..b, l) draws the graph of the parametric
++ curve \spad{x = f(t), y = g(t)} as t ranges from \spad{min(a, b)} to
++ \spad{max(a, b)}; \spad{(f(t), g(t))} is the default title, and the
++ options contained in the list l of the domain \spad{DrawOption}
++ are applied.
** Title and style defaults are malformed in most draw and makeObject routines
(see example below). Are those defaults necessary at all? I'd prefer to set
style="" and title (if at all) to the full function expression as in the
docstring indicated (possibly truncated if really too long). What do you think?
For instance: draw.spad, makeObject page 837 ff.
-- create title if necessary
if not option?(l, 'title) then
s : String := unparse(convert(f)@InputForm)
if sayLength(s)$DisplayPackage > 50 then
l := concat(title "FriCAS3D",l)
else l := concat(title s, l)
-- indicate draw style if necessary
if not option?(l, 'style) then
l := concat(style unparse(convert(f)@InputForm), l)
---
v1:=draw(cos(x*y),x=-3..3,y=-3..3)
(1) ThreeDimensionalViewport: "cos(x*y)"
Type: ThreeDimensionalViewport
(2) -> options v1
(2) [style = "cos(x*y)",title = "cos(x*y)"]
Type: List(DrawOption)
---
v2:=draw(curve(5*cos(t), 5*sin(t),t), t=-12..12)
(3) ThreeDimensionalViewport: "5*cos(t)"
Type: ThreeDimensionalViewport
(4) -> options v2
(4) [style = "5*cos(t)",title = "5*cos(t)"]
Type: List(DrawOption
---
v3:=draw(curve(5*cos(t), 5*sin(t),t), t=-12..12,title=="T",style=="")
(5) ThreeDimensionalViewport: "T"
Type: ThreeDimensionalViewport
(6) -> options v3
(6) [title = "T",style = ""]
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