[rrd-users] Re: Anti Aliasing on stack

[Tobias Oetiker]

Hi Antoine,

the antialaisiont is not that simple to switch on and off, but the
following patch should help.

Index: rrd_graph.c
===================================================================
--- rrd_graph.c (revision 536)
+++ rrd_graph.c (working copy)
@@ -2506,11 +2506,11 @@

           }
         } else {
-         float ybase0 = DNAN,ytop0=DNAN;
+         double ybase0 = DNAN,ytop0=DNAN;
           for(ii=0;ii<im->xsize;ii++){
            /* keep things simple for now, just draw these bars
               do not try to build a big and complex area */
-           float ybase,ytop;
+           double ybase,ytop;
            if ( im->slopemode == 0 && ii==0){
                continue;
            }
@@ -2531,7 +2531,7 @@
            /* every area has to be wound clock-wise,
               so we have to make sur base remains base  */
            if (ybase > ytop){
-               float extra = ytop;
+               double extra = ytop;
                ytop = ybase;
                ybase = extra;
            }
@@ -2541,13 +2541,13 @@
            }
            if ( !isnan(ybase0) ){
                    node = gfx_new_area(im->canvas,
-                                ii-1+im->xorigin,ybase0,
-                                ii-1+im->xorigin,ytop0,
-                                ii+im->xorigin,ytop,
+                                (double)ii-1.1+(double)im->xorigin,ybase0-0.1,
+                                (double)ii-1.1+(double)im->xorigin,ytop0+0.1,
+                                (double)ii+0.1+(double)im->xorigin,ytop+0.1,
                                 im->gdes[i].col
                                );
                    gfx_add_point(node,
-                               ii+im->xorigin,ybase
+                               (double)ii+0.01+im->xorigin,ybase-0.1
                               );
             }
            ybase0=ybase;



cheers
tobi


Today Antoine Guilmard wrote:

> Hi,
>
> I have a problem when rendering stack.
> It's visible on this image :
> http://guilmard.chez.tiscali.fr/stackaa.png
>
> DEF:Line1=DataBase1.rrd:adsldl:AVERAGE
> CDEF:flaming1=Line1,40,*,100,/
> AREA:flaming1#ffff5f:" Download"
> CDEF:flaming2=Line1,5,*,100,/
> STACK:flaming2#fff257
> STACK:flaming2#ffe54f
> STACK:flaming2#ffd947
> STACK:flaming2#ffcc3f
> STACK:flaming2#ffbf37
> STACK:flaming2#ffb230
> STACK:flaming2#ffa628
> STACK:flaming2#ff9920
> STACK:flaming2#ff8c18
> STACK:flaming2#ff8010
> STACK:flaming2#ff7308
> STACK:flaming2#ff6600
>
> All the stack are anti aliased, and a "white line" (antialiased line)
> appear below and above a stack.
> It is possible to remove the antialiasing in the intern stack ? or
> choose if you want
> antialiasing for a stack like, STACK:flaming2#fff257,AA_UP,AA_DOWN ?
>
> Thanks.
>
>
>
>
>
>
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