* Shading transparency / missing linear_shade variant
@ 2004-07-23 12:07 Eckhart Guthöhrlein
2004-07-24 9:36 ` Vit Zyka
0 siblings, 1 reply; 6+ messages in thread
From: Eckhart Guthöhrlein @ 2004-07-23 12:07 UTC (permalink / raw)
Hi all,
experimenting with transparencies, I have obviously come to a
limitation: color shading does not work for transparent colors. What I
have in mind is a bar filled with a color gradient, starting from a
certain (non-transparent) color and ending transparent, i.e. vanishing
into the background. However, the transparent color appears just black.
Furthermore, the shading variants for linear_shade do not correspond
with those listed in the metafun manual, page 180. Variant 2 is missing
and behaves like variant 3 should.
Example:
\setupcolors[state=start]
\setupbackgrounds[page][background=color,backgroundcolor=red]
\startMPenvironment[global]
\definecolor[HeadLineColor][r=0,g=0,b=1]
\definecolor[Transparent][r=1,g=1,b=1,t=0,a=normal]
\stopMPenvironment
\startreusableMPgraphic{test}
numeric u; u=3cm;
path p;
p := unitsquare xscaled u yscaled u cornered (u/10);
for i=0 upto 3 :
linear_shade(p shifted(i*u,0),i,\MPcolor{HeadLineColor},\MPcolor{Transparent});
endfor;
\stopreusableMPgraphic
\starttext
\reuseMPgraphic{test}
\stoptext
--
Eckhart
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Shading transparency / missing linear_shade variant
2004-07-23 12:07 Shading transparency / missing linear_shade variant Eckhart Guthöhrlein
@ 2004-07-24 9:36 ` Vit Zyka
2004-07-27 11:18 ` Eckhart Guthöhrlein
0 siblings, 1 reply; 6+ messages in thread
From: Vit Zyka @ 2004-07-24 9:36 UTC (permalink / raw)
> Furthermore, the shading variants for linear_shade do not correspond
> with those listed in the metafun manual, page 180. Variant 2 is missing
> and behaves like variant 3 should.
Not so exactly. The today reality is a bit richer than that in the
Metafun manual. One can choose from 8 directions:
number direction
1 NE
2 NW
3 SW
4 SE
5 E
6 N
7 W
8 S
other E
Vit Zyka
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Shading transparency / missing linear_shade variant
2004-07-24 9:36 ` Vit Zyka
@ 2004-07-27 11:18 ` Eckhart Guthöhrlein
2004-07-27 11:37 ` Hans Hagen
0 siblings, 1 reply; 6+ messages in thread
From: Eckhart Guthöhrlein @ 2004-07-27 11:18 UTC (permalink / raw)
On Sat, Jul 24, 2004 at 11:36:03AM +0200, Vit Zyka wrote:
> >Furthermore, the shading variants for linear_shade do not correspond
> >with those listed in the metafun manual, page 180. Variant 2 is missing
> >and behaves like variant 3 should.
>
> Not so exactly. The today reality is a bit richer than that in the
> Metafun manual. One can choose from 8 directions:
>
> number direction
> 1 NE
> 2 NW
> 3 SW
> 4 SE
> 5 E
> 6 N
> 7 W
> 8 S
> other E
All right, thanks. Admittedly, i could have found this by trying more
numbers.
But anyway, transparency is ignored when using shading. Is there any
possibility to achieve a gradient from, i.e., completely transparent to
completely intransparent white?
--
Eckhart
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Shading transparency / missing linear_shade variant
2004-07-27 11:18 ` Eckhart Guthöhrlein
@ 2004-07-27 11:37 ` Hans Hagen
2004-07-27 11:45 ` Eckhart Guthöhrlein
0 siblings, 1 reply; 6+ messages in thread
From: Hans Hagen @ 2004-07-27 11:37 UTC (permalink / raw)
Eckhart Guthöhrlein wrote:
>On Sat, Jul 24, 2004 at 11:36:03AM +0200, Vit Zyka wrote:
>
>
>>>Furthermore, the shading variants for linear_shade do not correspond
>>>with those listed in the metafun manual, page 180. Variant 2 is missing
>>>and behaves like variant 3 should.
>>>
>>>
>>Not so exactly. The today reality is a bit richer than that in the
>>Metafun manual. One can choose from 8 directions:
>>
>>number direction
>>1 NE
>>2 NW
>>3 SW
>>4 SE
>>5 E
>>6 N
>>7 W
>>8 S
>>other E
>>
>>
>
>All right, thanks. Admittedly, i could have found this by trying more
>numbers.
>But anyway, transparency is ignored when using shading. Is there any
>possibility to achieve a gradient from, i.e., completely transparent to
>completely intransparent white?
>
>
no(t yet), i dunno if pdf supports that -)
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
| www.pragma-pod.nl
-----------------------------------------------------------------
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Shading transparency / missing linear_shade variant
2004-07-27 11:37 ` Hans Hagen
@ 2004-07-27 11:45 ` Eckhart Guthöhrlein
2004-07-27 12:14 ` Hans Hagen
0 siblings, 1 reply; 6+ messages in thread
From: Eckhart Guthöhrlein @ 2004-07-27 11:45 UTC (permalink / raw)
On Tue, Jul 27, 2004 at 01:37:06PM +0200, Hans Hagen wrote:
> >But anyway, transparency is ignored when using shading. Is there any
> >possibility to achieve a gradient from, i.e., completely transparent to
> >completely intransparent white?
> >
> >
> no(t yet), i dunno if pdf supports that -)
That's really a pity. But alas, if *you* don't know, it's probably
hopeless.
--
Eckhart
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Shading transparency / missing linear_shade variant
2004-07-27 11:45 ` Eckhart Guthöhrlein
@ 2004-07-27 12:14 ` Hans Hagen
0 siblings, 0 replies; 6+ messages in thread
From: Hans Hagen @ 2004-07-27 12:14 UTC (permalink / raw)
Eckhart Guthöhrlein wrote:
>On Tue, Jul 27, 2004 at 01:37:06PM +0200, Hans Hagen wrote:
>
>
>>>But anyway, transparency is ignored when using shading. Is there any
>>>possibility to achieve a gradient from, i.e., completely transparent to
>>>completely intransparent white?
>>>
>>>
>>>
>>>
>>no(t yet), i dunno if pdf supports that -)
>>
>>
>
>That's really a pity. But alas, if *you* don't know, it's probably
>hopeless.
>
>
the problem is in the fact that in a shading one has to define a vector and i have to find out how to define a transparent vector (color 1 -> color 2)
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
| www.pragma-pod.nl
-----------------------------------------------------------------
^ permalink raw reply [flat|nested] 6+ messages in thread
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2004-07-23 12:07 Shading transparency / missing linear_shade variant Eckhart Guthöhrlein
2004-07-24 9:36 ` Vit Zyka
2004-07-27 11:18 ` Eckhart Guthöhrlein
2004-07-27 11:37 ` Hans Hagen
2004-07-27 11:45 ` Eckhart Guthöhrlein
2004-07-27 12:14 ` Hans Hagen
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