Commit patch to fix a bug with drawing bars extending below 0

git-svn-id: https://flot.googlecode.com/svn/trunk@70 1e0a6537-2640-0410-bfb7-f154510ff394

NEWS.txt

@@ -19,7 +19,9 @@ the fill.
 Fixed a bug in calculating spacing around the plot (reported by
 timothytoe). Fixed a bug in finding max values for all-negative data
 sets. Prevent the possibility of eternal looping in tick calculations.
-Fixed a bug when borderWidth is set to 0 (reported by Rob/sanchothefat).
+Fixed a bug when borderWidth is set to 0 (reported by
+Rob/sanchothefat). Fixed a bug with drawing bars extending below 0
+(reported by James Hewitt, convenient patch by Ryan Funduk).
 
 
 Flot 0.4

jquery.flot.js

@@ -1212,8 +1212,10 @@
                     
                     var x = data[i][0], y = data[i][1];
                     var drawLeft = true, drawTop = true, drawRight = true;
-                    var left = x, right = x + barWidth, bottom = 0, top = y;
 
+                    // determine the co-ordinates of the bar, account for negative bars having 
+                    // flipped top/bottom and draw/don't draw accordingly
+                    var left = x, right = x + barWidth, bottom = (y < 0 ? y : 0), top = (y < 0 ? 0 : y);
                     if (right < xaxis.min || left > xaxis.max || top < yaxis.min || bottom > yaxis.max)
                         continue;