dhtmlx-gantt-zoom-patch

Index: dhtmlx/dhtmlxGantt/sources/dhtmlxgantt.js
===================================================================
--- dhtmlx.orig/dhtmlxGantt/sources/dhtmlxgantt.js	2012-06-12 13:49:29.542481180 +0200
+++ dhtmlx/dhtmlxGantt/sources/dhtmlxgantt.js	2012-06-12 13:59:50.909197607 +0200
@@ -356,7 +356,9 @@

     //settings
     this.heightTaskItem = 12;
+    this.defaultDayInPixels = 24;
     this.dayInPixels = 24;
+    this.showDayNumbers = true;
     this.hoursInDay = 8;
     this._showTreePanel = true;
     this._showTooltip = true;
@@ -456,6 +458,30 @@
     this.savePath = newPath;
 };
 /**
+ * @desc: Set the number of pixels per day (horizontal zoom). This will also affect showDayNumbers
+ * @param: pixelsPerDay
+ * @type: public
+ * @before_init: 1
+ */
+GanttChart.prototype.setPixelsPerDay = function(numPixels)
+{
+    this.dayInPixels = numPixels;
+    if(this.dayInPixels < 16)
+        this.showDayNumbers = false;
+    else
+        this.showDayNumbers = true;
+}
+/**
+ * @desc: Enables / disables displaying the day numbers
+ * @param: showDayNumbers
+ * @type: public
+ * @before_init: 1
+ */
+GanttChart.prototype.setShowDayNumbers = function(showDayNumbers)
+{
+     this.showDayNumbers = showDayNumbers;
+}
+/**
  * @desc: set url which is used to load chart data with loadData() method
  * @param: newPath - url to server script.
  * @type: public
@@ -2405,9 +2431,12 @@
     divTasks.className = "taskPanel";
     divTasks.style.cssText = "position:relative;";
     divTasks.style.height = this.contentHeight - 63 + "px";
+    var bgWidth = 168 * (this.dayInPixels / this.defaultDayInPixels) + "px";
+    var bgHeight = "46px"; // The height of bg_week.png
     var w = this.startDate ? (this.startDate.getDay()-1) : ((new Date(0)).getDay()-1);
     if (w==-1) w=6;
-    divTasks.style.background = "url(" + this.imgs + "bg_week.png) -"+(w*24)+"px 0px";
+    divTasks.style.background = "url(" + this.imgs + "bg_week.png) -"+(w*this.dayInPixels)+"px 0px";
+    divTasks.style.backgroundSize = bgWidth + " " + bgHeight;
     this.panelTasks = divTasks;
     return divTasks;
 };
@@ -2578,7 +2607,8 @@

     date.setDate(date.getDate() + parseInt(idx));
     var day = date.getDate()
-    newCell.innerHTML = day;
+    if (this.showDayNumbers)
+        newCell.innerHTML = day;
     newCell.setAttribute("idx", idx);

     var monthRow = row.parentNode.parentNode.rows[0];