From: oetiker <oetiker@a5681a0c-68f1-0310-ab6d-d61299d08faa>
Date: Fri, 16 Dec 2011 17:40:15 +0000 (+0000)
Subject: backport improved grid-fitting
X-Git-Url: https://git.tokkee.org/?p=rrdtool-all.git;a=commitdiff_plain;h=80190a827f3dd704487f013279ae4821bb345ef4

backport improved grid-fitting

git-svn-id: svn://svn.oetiker.ch/rrdtool/branches/1.4@2244 a5681a0c-68f1-0310-ab6d-d61299d08faa
---

diff --git a/program/src/rrd_gfx.c b/program/src/rrd_gfx.c
index 429ea472..30bf7912 100644
--- a/program/src/rrd_gfx.c
+++ b/program/src/rrd_gfx.c
@@ -293,10 +293,10 @@ void gfx_line_fit(
     line_width = cairo_get_line_width(cr);
     line_height = line_width;
     cairo_user_to_device_distance(cr, &line_width, &line_height);
-    line_width = line_width / 2.0 - (long) (line_width / 2.0);
-    line_height = line_height / 2.0 - (long) (line_height / 2.0);
-    *x = (double) ((long) (*x + 0.5)) - line_width;
-    *y = (double) ((long) (*y + 0.5)) + line_height;
+    line_width = line_width / 2.0 - ceil(line_width / 2.0);
+    line_height = line_height / 2.0 - ceil(line_height / 2.0);
+    *x = ceil(*x - 0.5) - line_width;
+    *y = ceil(*y + 0.5) + line_height;
     cairo_device_to_user(cr, x, y);
 }
 
@@ -312,7 +312,7 @@ void gfx_area_fit(
     if (!im->gridfit)
         return;
     cairo_user_to_device(cr, x, y);
-    *x = (double) ((long) (*x + 0.5));
-    *y = (double) ((long) (*y + 0.5));
+    *x = floor(*x);
+    *y = ceil(*y);
     cairo_device_to_user(cr, x, y);
 }