diff --git a/src/Graph.php b/src/Graph.php
index b0b8964..5734725 100644
--- a/src/Graph.php
+++ b/src/Graph.php
@@ -66,6 +66,9 @@ class Graph
     if (! function_exists ("imagecreatetruecolor"))
       throw new \Exception (dgettext ("domframework",
         "No GD support in PHP : can't create image"), 500);
+    if (! function_exists ("bccomp"))
+      throw new \Exception (dgettext ("domframework",
+        "No BCMath support in PHP : can't create image"), 500);
     $this->title = new GraphTitle ();
     $this->legend = new GraphLegend ();
     $this->data = new GraphData ();
@@ -131,7 +134,7 @@ class Graph
     if ($bgcolor === null)
       return $this->bgcolor;
     if (! is_string ($bgcolor) ||
-        ! in_array ($bgcolor, \color::colorList ()))
+        ! in_array ($bgcolor, Color::colorList ()))
       throw new \Exception (dgettext ("domframework",
         "Invalid bgcolor provided to graph"), 406);
     $this->bgcolor = $bgcolor;
@@ -165,7 +168,7 @@ class Graph
         ! in_array ($style, array ("line", "points", "linePoints")))
       throw new \Exception (dgettext ("domframework",
         "Invalid style provided to graph"), 406);
-    $styleClass = "GraphStyle".$style;
+    $styleClass = __NAMESPACE__."\\GraphStyle".ucfirst($style);
     if ($this->style === null || $this->style ()->name () !== $style)
     {
       $this->style = new $styleClass ();
@@ -310,7 +313,7 @@ class Graph
     $gd = imagecreatetruecolor ($this->width, $this->height);
     // Put the background color
     imagefilledrectangle ($gd, 0, 0, $this->width - 1 , $this->height - 1 ,
-      \color::allocateFromText ($gd, $this->bgcolor));
+      Color::allocateFromText ($gd, $this->bgcolor));
     // The coordinates of the free space. Will be modified each time something
     // is drawing on the graph
     // xtop, ytop, xbottom, ybottom
@@ -415,7 +418,14 @@ class GraphSeries
     */
   public function getList ()
   {
-    return array_keys ($this->series);
+    $series = [];
+    foreach ($this->series as $name => $serie)
+    {
+      if ($serie->hide() === true)
+        continue;
+      $series[] = $name;
+    }
+    return $series;
   }
 
   /** Remove an existing serie
@@ -472,6 +482,9 @@ class GraphSerie
   /** The style object for the serie
     */
   private $style;
+  /** If set, hide this serie and do not display it
+    */
+  private $hide;
 
   /** The axis used to draw the serie.
     * If false for main Y axis
@@ -637,6 +650,20 @@ class GraphSerie
       $this->style = new $styleClass ();
     return $this->style;
   }
+  /** Set/Get the hidden state of the serie
+    * If the parameter is not provided, return the actual state
+    * @param boolean|null $hide The hidden state
+    */
+  public function hide ($hide = null)
+  {
+    if ($hide === null)
+      return $this->hide;
+    if (! is_bool ($hide))
+      throw new \Exception (dgettext ("domframework",
+        "Invalid hide mode provided to serie"), 406);
+    $this->hide = $hide;
+    return $this;
+  }
 
   /** The serie is based on the secondary Y axis
     * Set the value if the parameter is provided, get the value if the parameter
@@ -663,6 +690,8 @@ class GraphSerie
     */
   public function draw ($gd, $free, $axisX, $axisY)
   {
+    if ($this->hide === true)
+      return;
     $this->style->draw ($gd, $free, $this->data, $axisX, $axisY);
   }
 }
@@ -1016,7 +1045,7 @@ class GraphTitle
     if ($color === null)
       return $this->color;
      if (! is_string ($color) ||
-        ! in_array ($color, \color::colorList ()))
+        ! in_array ($color, Color::colorList ()))
       throw new \Exception (dgettext ("domframework",
         "Invalid color provided to graph title"), 406);
     $this->color = $color;
@@ -1057,7 +1086,7 @@ class GraphTitle
     $x += $free[0];
     $y += $free[1];
     imagettftext ($gd, $this->fontsize, 0, $x, $y,
-                  \color::allocateFromText ($gd, $this->color),
+                  Color::allocateFromText ($gd, $this->color),
                   $this->fontfile, $this->text);
     return array (intval ($free[0]), intval ($free[1] + $y + $this->padding),
                   intval ($free[2]), intval ($free[3]));
@@ -1152,7 +1181,7 @@ class GraphLegend
     if ($color === null)
       return $this->color;
      if (! is_string ($color) ||
-        ! in_array ($color, \color::colorList ()))
+        ! in_array ($color, Color::colorList ()))
       throw new \Exception (dgettext ("domframework",
         "Invalid color provided to graph legend"), 406);
     $this->color = $color;
@@ -1168,7 +1197,7 @@ class GraphLegend
     if ($bgcolor === null)
       return $this->bgcolor;
      if (! is_string ($bgcolor) ||
-        ! in_array ($bgcolor, \color::colorList ()))
+        ! in_array ($bgcolor, Color::colorList ()))
       throw new \Exception (dgettext ("domframework",
         "Invalid bgcolor provided to graph legend"), 406);
     $this->bgcolor = $bgcolor;
@@ -1184,7 +1213,7 @@ class GraphLegend
     if ($borderColor === null)
       return $this->borderColor;
      if (! is_string ($borderColor) ||
-        ! in_array ($borderColor, \color::colorList ()))
+        ! in_array ($borderColor, Color::colorList ()))
       throw new \Exception (dgettext ("domframework",
         "Invalid borderColor provided to graph legend"), 406);
     $this->borderColor = $borderColor;
@@ -1244,10 +1273,10 @@ class GraphLegend
     $border = 1;
     // Draw the background rectangle
     imagefilledrectangle ($gd, $x1, $y1, $x2, $y2,
-                          \color::allocateFromText ($gd, $this->borderColor));
+                          Color::allocateFromText ($gd, $this->borderColor));
     imagefilledrectangle ($gd, $x1+$border, $y1+$border,
                                $x2-$border, $y2-$border,
-                          \color::allocateFromText ($gd, $this->bgcolor));
+                          Color::allocateFromText ($gd, $this->bgcolor));
 
     // Display the serie names
     $y = $y1;
@@ -1259,7 +1288,7 @@ class GraphLegend
       $y += $height;
       imagettftext ($gd, $this->fontsize, 0,
                     $x1 + 30, intval ($y + $height / 2),
-                    \color::allocateFromText ($gd, $this->color),
+                    Color::allocateFromText ($gd, $this->color),
                     $this->fontfile, $serie);
       // Draw the sample
       $series->serie ($serie)->style ()->sample ($gd, $x1 + 15, $y);
@@ -1509,7 +1538,7 @@ class GraphAxisGeneral
     if ($axisColor === null)
       return $this->axisColor;
     if (! is_string ($axisColor) ||
-        ! in_array ($axisColor, \color::colorList ()))
+        ! in_array ($axisColor, Color::colorList ()))
       throw new \Exception (dgettext ("domframework",
         "Invalid axisColor provided to graph axis"), 406);
     $this->axisColor = $axisColor;
@@ -1525,7 +1554,7 @@ class GraphAxisGeneral
     if ($gridColor === null)
       return $this->gridColor;
     if (! is_string ($gridColor) ||
-        ! in_array ($gridColor, \color::colorList ()))
+        ! in_array ($gridColor, Color::colorList ()))
       throw new \Exception (dgettext ("domframework",
         "Invalid gridColor provided to graph grid"), 406);
     $this->gridColor = $gridColor;
@@ -1581,7 +1610,7 @@ class GraphAxisGeneral
         // Return the 0 label and the values arround it
         $zeroAlreadyDraw = false;
         for ($i = 0 ;
-             bccomp ($i, 1.2 * $max, abs ($base) + 1) < 1 ;
+             \bccomp ($i, 1.2 * $max, abs ($base) + 1) < 1 ;
              $i += $scale)
         {
           if ($i === 0)
@@ -1590,7 +1619,7 @@ class GraphAxisGeneral
           $labels[] = $i;
         }
         for ($i = 0 ;
-             bccomp ($i, 1.4 * $min, abs ($base) + 1) >= 0 ;
+             \bccomp ($i, 1.4 * $min, abs ($base) + 1) >= 0 ;
              $i -= $scale)
         {
           if ($zeroAlreadyDraw === true && $i === 0)
@@ -1603,7 +1632,7 @@ class GraphAxisGeneral
       {
         // No 0 Axis : From $this->min to $this->max
         for ($i = $min ;
-             bccomp ($i, $max, abs ($base) + 1) < 1 ;
+             \bccomp ($i, $max, abs ($base) + 1) < 1 ;
              $i += $scale)
         {
           if ($deb) echo "Values no Zero : add val $i\n";
@@ -1619,14 +1648,14 @@ class GraphAxisGeneral
           else
             $label = sprintf ("%".intval ($base)."d", $label);
           if ($this->labelMin === null ||
-              bccomp ($this->labelMin, $label, abs ($base) + 1) >= 0)
+              \bccomp ($this->labelMin, $label, abs ($base) + 1) >= 0)
             $this->labelMin = $label;
           if ($this->labelMax === null ||
-               bccomp ($this->labelMax, $label, abs ($base) + 1) <= 0)
+               \bccomp ($this->labelMax, $label, abs ($base) + 1) <= 0)
             $this->labelMax = $label;
         }
 
-        if (bccomp ($this->labelMin, $this->min, abs ($base) + 1) > 0)
+        if (\bccomp ($this->labelMin, $this->min, abs ($base) + 1) > 0)
         {
           // Add a label in the minimum
           $this->labelMin = $this->labelMin - $scale;
@@ -1637,7 +1666,7 @@ class GraphAxisGeneral
           else
             $labels[] = sprintf ("%".intval ($base)."d", $this->labelMin);
         }
-        if (bccomp ($this->labelMax, $this->max, abs ($base) + 1) < 0)
+        if (\bccomp ($this->labelMax, $this->max, abs ($base) + 1) < 0)
         {
           $this->labelMax = $this->labelMax + $scale;
           if ($deb) echo "Force Add Max $this->labelMax\n";
@@ -1828,7 +1857,7 @@ class GraphAxisX extends GraphAxisHorizontal
     */
   public function draw ($gd)
   {
-    $axisColor = \color::allocateFromText ($gd, $this->axisColor);
+    $axisColor = Color::allocateFromText ($gd, $this->axisColor);
     if ($this->numerical)
     {
       if ($this->angle === null)
@@ -1847,7 +1876,7 @@ class GraphAxisX extends GraphAxisHorizontal
         $y = $this->bottom - $this->padding;
         // The font color is forced to black
         imagettftext ($gd, $this->fontsize, $this->angle, $x, $y,
-                  \color::allocateFromText ($gd, "black"),
+                  Color::allocateFromText ($gd, "black"),
                   $this->fontfile, $value);
 
         // Draw the scale
@@ -1883,7 +1912,7 @@ class GraphAxisX extends GraphAxisHorizontal
         $y = $this->bottom - $this->padding;
         // The font color is forced to black
         imagettftext ($gd, $this->fontsize, $this->angle, $x, $y,
-                  \color::allocateFromText ($gd, "black"),
+                  Color::allocateFromText ($gd, "black"),
                   $this->fontfile, $value);
 
         // Draw the separators
@@ -1912,7 +1941,7 @@ class GraphAxisX extends GraphAxisHorizontal
   {
     if ($this->gridColor === null || $this->gridColor === "transparent")
       return;
-    $gridColor = \color::allocateFromText ($gd, $this->gridColor);
+    $gridColor = Color::allocateFromText ($gd, $this->gridColor);
     if ($position === null)
       return;
     $y = $this->bottom - $this->height;
@@ -2065,7 +2094,7 @@ class GraphAxisVertical extends GraphAxisGeneral
     */
   public function draw ($gd)
   {
-    $axisColor = \color::allocateFromText ($gd, $this->axisColor);
+    $axisColor = Color::allocateFromText ($gd, $this->axisColor);
     if ($this->numerical)
     {
       // Look at the minimum distance between two labeled values
@@ -2112,7 +2141,7 @@ class GraphAxisY1 extends GraphAxisVertical
     */
   protected function drawOne ($gd, $width, $val)
   {
-    $axisColor = \color::allocateFromText ($gd, $this->axisColor);
+    $axisColor = Color::allocateFromText ($gd, $this->axisColor);
     if ($this->numerical)
     {
       // Do not allow the label to be longer than $this->max
@@ -2131,7 +2160,7 @@ class GraphAxisY1 extends GraphAxisVertical
       imagettftext ($gd, $this->fontsize, 0,
                     $width - $labelwidth,
                     $y + $labelheight / 2,
-                    \color::allocateFromText ($gd, "black"),
+                    Color::allocateFromText ($gd, "black"),
                     $this->fontfile, $itmp);
 
       // Display the separators
@@ -2150,7 +2179,7 @@ die ("graphAxisY1:: drawOne NOT numerical line ".__LINE__."\n");
     */
   protected function drawAxis ($gd, $width)
   {
-    $axisColor = \color::allocateFromText ($gd, $this->axisColor);
+    $axisColor = Color::allocateFromText ($gd, $this->axisColor);
     imageline ($gd, $width, $this->bottom, $width, $this->top, $axisColor);
   }
 
@@ -2163,7 +2192,7 @@ die ("graphAxisY1:: drawOne NOT numerical line ".__LINE__."\n");
   {
     if ($this->gridColor === null || $this->gridColor === "transparent")
       return;
-    $gridColor = \color::allocateFromText ($gd, $this->gridColor);
+    $gridColor = Color::allocateFromText ($gd, $this->gridColor);
     if ($this->numerical)
     {
       $y = $this->position ($val);
@@ -2190,7 +2219,7 @@ class GraphAxisY2 extends GraphAxisVertical
     */
   protected function drawOne ($gd, $width, $val)
   {
-    $axisColor = \color::allocateFromText ($gd, $this->axisColor);
+    $axisColor = Color::allocateFromText ($gd, $this->axisColor);
     if ($this->numerical)
     {
       // Do not allow the label to be longer than $this->max
@@ -2209,7 +2238,7 @@ class GraphAxisY2 extends GraphAxisVertical
       imagettftext ($gd, $this->fontsize, 0,
                     $this->left + $this->padding + 3,
                     $y + $labelheight / 2,
-                    \color::allocateFromText ($gd, "black"),
+                    Color::allocateFromText ($gd, "black"),
                     $this->fontfile, $itmp);
 
       // Display the separators
@@ -2228,7 +2257,7 @@ die ("graphAxisY2:: drawOne NOT numerical line ".__LINE__."\n");
     */
   protected function drawAxis ($gd, $width)
   {
-    $axisColor = \color::allocateFromText ($gd, $this->axisColor);
+    $axisColor = Color::allocateFromText ($gd, $this->axisColor);
     imageline ($gd, $this->left, $this->bottom,
                       $this->left, $this->top, $axisColor);
   }
@@ -2296,7 +2325,7 @@ class GraphStyleLinePoints
       return $this->lineColor;
      if (! is_string ($lineColor) ||
         ($lineColor !== "transparent" &&
-         ! in_array ($lineColor, \color::colorList ())))
+         ! in_array ($lineColor, Color::colorList ())))
       throw new \Exception (dgettext ("domframework",
         "Invalid lineColor provided to line style"), 406);
     $this->lineColor = $lineColor;
@@ -2328,7 +2357,7 @@ class GraphStyleLinePoints
       return $this->pointBgcolor;
      if (! is_string ($pointBgcolor) ||
          ($pointBgcolor !== "transparent" &&
-          ! in_array ($pointBgcolor, \color::colorList ())))
+          ! in_array ($pointBgcolor, Color::colorList ())))
       throw new \Exception (dgettext ("domframework",
         "Invalid pointBgcolor provided to line style"), 406);
     $this->pointBgcolor = $pointBgcolor;
@@ -2345,7 +2374,7 @@ class GraphStyleLinePoints
       return $this->pointColor;
      if (! is_string ($pointColor) ||
          ($pointColor !== "transparent" &&
-          ! in_array ($pointColor, \color::colorList ())))
+          ! in_array ($pointColor, Color::colorList ())))
       throw new \Exception (dgettext ("domframework",
         "Invalid pointColor provided to line style"), 406);
     $this->pointColor = $pointColor;
@@ -2419,7 +2448,7 @@ class GraphStyleLinePoints
   public function draw ($gd, $free, $data, $axisX, $axisY)
   {
     if ($this->lineColor !== "transparent")
-      $lineColor    = \color::allocateFromText ($gd, $this->lineColor);
+      $lineColor    = Color::allocateFromText ($gd, $this->lineColor);
     $lastX = null;
     $lastY = null;
     foreach ($data as $key=>$value)
@@ -2465,9 +2494,9 @@ class GraphStyleLinePoints
   private function drawPoint ($gd, $posX, $posY)
   {
     if ($this->pointColor !== "transparent")
-      $pointColor   = \color::allocateFromText ($gd, $this->pointColor);
+      $pointColor   = Color::allocateFromText ($gd, $this->pointColor);
     if ($this->pointBgcolor !== "transparent")
-      $pointBgcolor = \color::allocateFromText ($gd, $this->pointBgcolor);
+      $pointBgcolor = Color::allocateFromText ($gd, $this->pointBgcolor);
     $half = intval ($this->pointWidth / 2);
     switch ($this->pointShape)
     {
@@ -2530,7 +2559,7 @@ class GraphStyleLinePoints
   {
     if ($this->lineColor !== "transparent")
     {
-      $lineColor    = \color::allocateFromText ($gd, $this->lineColor);
+      $lineColor    = Color::allocateFromText ($gd, $this->lineColor);
       imageline ($gd, $x-10, $y, $x+10, $y, $lineColor);
     }
     if ($this->pointWidth === null)