fixed some corner cases in drawing code to get the same results as before with way...

git-svn-id: svn://svn.oetiker.ch/rrdtool/branches/1.2@653 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/program/src/rrd_graph.c b/program/src/rrd_graph.c
index a6991479e03c9431045ccbc0b2e068dfdf4e8b46..5f656aa36947b1c843eee6e76386a86a6d80f7d7 100644 (file)
--- a/program/src/rrd_graph.c
+++ b/program/src/rrd_graph.c
@@ -2500,18 +2500,18 @@ graph_paint(image_desc_t *im, char ***calcpr)
 
           }
         } else {
-         double ybase0 = DNAN,ytop0=DNAN;
          int idxI=-1;
          double *foreY=malloc(sizeof(double)*im->xsize*2);
          double *foreX=malloc(sizeof(double)*im->xsize*2);
          double *backY=malloc(sizeof(double)*im->xsize*2);
          double *backX=malloc(sizeof(double)*im->xsize*2);
+         int drawem = 0;
           for(ii=0;ii<=im->xsize;ii++){
            double ybase,ytop;
-           if ( idxI >= 1 && ( ybase0 == DNAN || ii==im->xsize)){
+           if ( idxI > 0 && ( drawem != 0 || ii==im->xsize)){
                int cntI=1;
                int lastI=0;
-               while ( cntI < idxI && foreY[lastI] == foreY[cntI] && foreY[lastI] == foreY[cntI+1]){cntI++;}
+               while (cntI < idxI && foreY[lastI] == foreY[cntI] && foreY[lastI] == foreY[cntI+1]){cntI++;}
                node = gfx_new_area(im->canvas,
                                 backX[0],backY[0],
                                 foreX[0],foreY[0],
@@ -2521,7 +2521,6 @@ graph_paint(image_desc_t *im, char ***calcpr)
                  cntI++;
                  while ( cntI < idxI && foreY[lastI] == foreY[cntI] && foreY[lastI] == foreY[cntI+1]){cntI++;} 
                  gfx_add_point(node,foreX[cntI],foreY[cntI]);
-
                }
                gfx_add_point(node,backX[idxI],backY[idxI]);
                while (idxI > 1){
@@ -2531,8 +2530,12 @@ graph_paint(image_desc_t *im, char ***calcpr)
                  gfx_add_point(node,backX[idxI],backY[idxI]);
                }
                idxI=-1;
+               drawem = 0;
+            }
+            if (drawem != 0){
+              drawem = 0;
+              idxI=-1;
             }
-            
             if (ii == im->xsize) break;
             
            /* keep things simple for now, just draw these bars
@@ -2543,7 +2546,7 @@ graph_paint(image_desc_t *im, char ***calcpr)
                continue;
            }
            if ( isnan(im->gdes[i].p_data[ii]) ) {
-               ybase0 = DNAN;
+               drawem = 1;
                continue;
            }
             ytop = ytr(im,im->gdes[i].p_data[ii]);
@@ -2553,7 +2556,7 @@ graph_paint(image_desc_t *im, char ***calcpr)
                   ybase = ytr(im,areazero);
             }
             if ( ybase == ytop ){
-               ybase0 = DNAN;
+               drawem = 1;
                continue;       
            }
            /* every area has to be wound clock-wise,
@@ -2563,25 +2566,16 @@ graph_paint(image_desc_t *im, char ***calcpr)
                ytop = ybase;
                ybase = extra;
            }
-           if ( im->slopemode == 0){
-                ybase0 = ybase;
-                ytop0 = ytop;
-           }
-           if (!isnan(ybase0)){ 
-                 if ( im->slopemode == 0 ){
-                    backY[++idxI] = ybase0-0.2;
+            if ( im->slopemode == 0 ){
+                    backY[++idxI] = ybase-0.2;
                     backX[idxI] = ii+im->xorigin-1;
-                    foreY[idxI] = ytop0+0.2;
+                    foreY[idxI] = ytop+0.2;
                     foreX[idxI] = ii+im->xorigin-1;
-                 }
-                 backY[++idxI] = ybase-0.2;
-                 backX[idxI] = ii+im->xorigin;
-                 foreY[idxI] = ytop+0.2;
-                 foreX[idxI] = ii+im->xorigin;
             }
-            
-           ybase0=ybase;
-           ytop0=ytop;
+            backY[++idxI] = ybase-0.2;
+            backX[idxI] = ii+im->xorigin;
+            foreY[idxI] = ytop+0.2;
+            foreX[idxI] = ii+im->xorigin;
           }
           /* close up any remaining area */             
           free(foreY);