<?php
 /*
     pSurface - class to draw surface charts

     Version     : 2.1.4
     Made by     : Jean-Damien POGOLOTTI
     Last Update : 19/01/2014

     This file can be distributed under the license you can find at :

                       http://www.pchart.net/license

     You can find the whole class documentation on the pChart web site.
 */

 define("UNKNOWN"		, 0.123456789);
 define("IGNORED"		, -1);

 define("LABEL_POSITION_LEFT"	, 880001);
 define("LABEL_POSITION_RIGHT"	, 880002);
 define("LABEL_POSITION_TOP"	, 880003);
 define("LABEL_POSITION_BOTTOM"	, 880004);

 /* pStock class definition */
 class pSurface
  {
   var $pChartObject;
   var $GridSizeX;
   var $GridSizeY;
   var $Points;

   /* Class creator */
   function pSurface($pChartObject)
    {
     $this->pChartObject = $pChartObject;
     $this->GridSize     = 10;
     $this->Points       = "";
    }

   /* Define the grid size and initialise the 2D matrix */
   function setGrid($XSize=10,$YSize=10)
    {
     for($X=0; $X<=$XSize; $X++) { for($Y=0; $Y<=$YSize; $Y++) { $this->Points[$X][$Y]=UNKNOWN; } } 

     $this->GridSizeX = $XSize;
     $this->GridSizeY = $YSize;
    }

   /* Add a point on the grid */
   function addPoint($X,$Y,$Value,$Force=TRUE)
    {
     if ( $X < 0 || $X >$this->GridSizeX ) { return(0); }
     if ( $Y < 0 || $Y >$this->GridSizeY ) { return(0); }

     if ( $this->Points[$X][$Y] == UNKNOWN || $Force )
      $this->Points[$X][$Y] = $Value;
     elseif ( $this->Points[$X][$Y] == UNKNOWN )
      $this->Points[$X][$Y] = $Value;
     else
      $this->Points[$X][$Y] = ($this->Points[$X][$Y] + $Value)/2;
    }

   /* Write the X labels */
   function writeXLabels($Format="")
    {
     $R			= isset($Format["R"]) ? $Format["R"] : $this->pChartObject->FontColorR;
     $G			= isset($Format["G"]) ? $Format["G"] : $this->pChartObject->FontColorG;
     $B			= isset($Format["B"]) ? $Format["B"] : $this->pChartObject->FontColorB;
     $Alpha		= isset($Format["Alpha"]) ? $Format["Alpha"] : $this->pChartObject->FontColorA;
     $Angle		= isset($Format["Angle"]) ? $Format["Angle"] : 0;
     $Padding		= isset($Format["Padding"]) ? $Format["Padding"] : 5;
     $Position		= isset($Format["Position"]) ? $Format["Position"] : LABEL_POSITION_TOP;
     $Labels		= isset($Format["Labels"]) ? $Format["Labels"] : NULL;
     $CountOffset	= isset($Format["CountOffset"]) ? $Format["CountOffset"] : 0;

     if ( $Labels != NULL && !is_array($Labels) ) { $Label = $Labels; $Labels = ""; $Labels[] = $Label; }

     $X0    = $this->pChartObject->GraphAreaX1;
     $XSize = ($this->pChartObject->GraphAreaX2 - $this->pChartObject->GraphAreaX1) / ($this->GridSizeX+1);

     $Settings = array("Angle"=>$Angle,"R"=>$R,"G"=>$G,"B"=>$B,"Alpha"=>$Alpha);
     if ( $Position == LABEL_POSITION_TOP )
      {
       $YPos  = $this->pChartObject->GraphAreaY1 - $Padding;
       if ($Angle == 0 ) { $Settings["Align"] = TEXT_ALIGN_BOTTOMMIDDLE; }
       if ($Angle != 0 ) { $Settings["Align"] = TEXT_ALIGN_MIDDLELEFT; }
      }
     elseif ( $Position == LABEL_POSITION_BOTTOM )
      {
       $YPos  = $this->pChartObject->GraphAreaY2 + $Padding;
       if ($Angle == 0 ) { $Settings["Align"] = TEXT_ALIGN_TOPMIDDLE; }
       if ($Angle != 0 ) { $Settings["Align"] = TEXT_ALIGN_MIDDLERIGHT; }
      }
     else
      return(-1);

     for($X=0;$X<=$this->GridSizeX;$X++)
      {
       $XPos = floor($X0+$X*$XSize + $XSize/2);

       if( $Labels == NULL || !isset($Labels[$X]) )
        $Value = $X+$CountOffset;
       else
        $Value = $Labels[$X];

       $this->pChartObject->drawText($XPos,$YPos,$Value,$Settings);
      }
    }

   /* Write the Y labels */
   function writeYLabels($Format="")
    {
     $R			= isset($Format["R"]) ? $Format["R"] : $this->pChartObject->FontColorR;
     $G			= isset($Format["G"]) ? $Format["G"] : $this->pChartObject->FontColorG;
     $B			= isset($Format["B"]) ? $Format["B"] : $this->pChartObject->FontColorB;
     $Alpha		= isset($Format["Alpha"]) ? $Format["Alpha"] : $this->pChartObject->FontColorA;
     $Angle		= isset($Format["Angle"]) ? $Format["Angle"] : 0;
     $Padding		= isset($Format["Padding"]) ? $Format["Padding"] : 5;
     $Position		= isset($Format["Position"]) ? $Format["Position"] : LABEL_POSITION_LEFT;
     $Labels		= isset($Format["Labels"]) ? $Format["Labels"] : NULL;
     $CountOffset	= isset($Format["CountOffset"]) ? $Format["CountOffset"] : 0;

     if ( $Labels != NULL && !is_array($Labels) ) { $Label = $Labels; $Labels = ""; $Labels[] = $Label; }

     $Y0    = $this->pChartObject->GraphAreaY1;
     $YSize = ($this->pChartObject->GraphAreaY2 - $this->pChartObject->GraphAreaY1) / ($this->GridSizeY+1);

     $Settings = array("Angle"=>$Angle,"R"=>$R,"G"=>$G,"B"=>$B,"Alpha"=>$Alpha);
     if ( $Position == LABEL_POSITION_LEFT )
      { $XPos  = $this->pChartObject->GraphAreaX1 - $Padding; $Settings["Align"] = TEXT_ALIGN_MIDDLERIGHT; }
     elseif ( $Position == LABEL_POSITION_RIGHT )
      { $XPos  = $this->pChartObject->GraphAreaX2 + $Padding; $Settings["Align"] = TEXT_ALIGN_MIDDLELEFT; }
     else
      return(-1);

     for($Y=0;$Y<=$this->GridSizeY;$Y++)
      {
       $YPos = floor($Y0+$Y*$YSize + $YSize/2);

       if( $Labels == NULL || !isset($Labels[$Y]) )
        $Value = $Y+$CountOffset;
       else
        $Value = $Labels[$Y];

       $this->pChartObject->drawText($XPos,$YPos,$Value,$Settings);
      }
    }

   /* Draw the area arround the specified Threshold */
   function drawContour($Threshold,$Format="")
    {
     $R		= isset($Format["R"]) ? $Format["R"] : 0;
     $G		= isset($Format["G"]) ? $Format["G"] : 0;
     $B		= isset($Format["B"]) ? $Format["B"] : 0;
     $Alpha	= isset($Format["Alpha"]) ? $Format["Alpha"] : 100;
     $Ticks	= isset($Format["Ticks"]) ? $Format["Ticks"] : 3;
     $Padding	= isset($Format["Padding"]) ? $Format["Padding"] : 0;

     $X0    = $this->pChartObject->GraphAreaX1;
     $Y0    = $this->pChartObject->GraphAreaY1;
     $XSize = ($this->pChartObject->GraphAreaX2 - $this->pChartObject->GraphAreaX1) / ($this->GridSizeX+1);
     $YSize = ($this->pChartObject->GraphAreaY2 - $this->pChartObject->GraphAreaY1) / ($this->GridSizeY+1);

     $Color = array("R"=>$R,"G"=>$G,"B"=>$B,"Alpha"=>$Alpha,"Ticks"=>$Ticks);

     for($X=0;$X<=$this->GridSizeX;$X++)
      {
       for($Y=0;$Y<=$this->GridSizeY;$Y++)
        {
         $Value = $this->Points[$X][$Y];

         if ( $Value != UNKNOWN && $Value != IGNORED && $Value >= $Threshold)
          {
           $X1 = floor($X0+$X*$XSize)+$Padding;
           $Y1 = floor($Y0+$Y*$YSize)+$Padding;
           $X2 = floor($X0+$X*$XSize+$XSize);
           $Y2 = floor($Y0+$Y*$YSize+$YSize);

           if ( $X > 0 && $this->Points[$X-1][$Y] != UNKNOWN && $this->Points[$X-1][$Y] != IGNORED && $this->Points[$X-1][$Y] < $Threshold)
            $this->pChartObject->drawLine($X1,$Y1,$X1,$Y2,$Color);
           if ( $Y > 0 && $this->Points[$X][$Y-1] != UNKNOWN && $this->Points[$X][$Y-1] != IGNORED && $this->Points[$X][$Y-1] < $Threshold)
            $this->pChartObject->drawLine($X1,$Y1,$X2,$Y1,$Color);
           if ( $X < $this->GridSizeX && $this->Points[$X+1][$Y] != UNKNOWN && $this->Points[$X+1][$Y] != IGNORED && $this->Points[$X+1][$Y] < $Threshold)
            $this->pChartObject->drawLine($X2,$Y1,$X2,$Y2,$Color);
           if ( $Y < $this->GridSizeY && $this->Points[$X][$Y+1] != UNKNOWN && $this->Points[$X][$Y+1] != IGNORED && $this->Points[$X][$Y+1] < $Threshold)
            $this->pChartObject->drawLine($X1,$Y2,$X2,$Y2,$Color);
          }
        }
      }
    }

   /* Draw the surface chart */
   function drawSurface($Format="")
    {
     $Palette		= isset($Format["Palette"]) ? $Format["Palette"] : NULL;
     $ShadeR1		= isset($Format["ShadeR1"]) ? $Format["ShadeR1"] : 77;
     $ShadeG1		= isset($Format["ShadeG1"]) ? $Format["ShadeG1"] : 205;
     $ShadeB1		= isset($Format["ShadeB1"]) ? $Format["ShadeB1"] : 21;
     $ShadeA1		= isset($Format["ShadeA1"]) ? $Format["ShadeA1"] : 40;
     $ShadeR2		= isset($Format["ShadeR2"]) ? $Format["ShadeR2"] : 227;
     $ShadeG2		= isset($Format["ShadeG2"]) ? $Format["ShadeG2"] : 135;
     $ShadeB2		= isset($Format["ShadeB2"]) ? $Format["ShadeB2"] : 61;
     $ShadeA2		= isset($Format["ShadeA2"]) ? $Format["ShadeA2"] : 100;
     $Border		= isset($Format["Border"]) ? $Format["Border"] : FALSE;
     $BorderR		= isset($Format["BorderR"]) ? $Format["BorderR"] : 0;
     $BorderG		= isset($Format["BorderG"]) ? $Format["BorderG"] : 0;
     $BorderB		= isset($Format["BorderB"]) ? $Format["BorderB"] : 0;
     $Surrounding	= isset($Format["Surrounding"]) ? $Format["Surrounding"] : -1;
     $Padding		= isset($Format["Padding"]) ? $Format["Padding"] : 1;

     $X0    = $this->pChartObject->GraphAreaX1;
     $Y0    = $this->pChartObject->GraphAreaY1;
     $XSize = ($this->pChartObject->GraphAreaX2 - $this->pChartObject->GraphAreaX1) / ($this->GridSizeX+1);
     $YSize = ($this->pChartObject->GraphAreaY2 - $this->pChartObject->GraphAreaY1) / ($this->GridSizeY+1);

     for($X=0;$X<=$this->GridSizeX;$X++)
      {
       for($Y=0;$Y<=$this->GridSizeY;$Y++)
        {
         $Value = $this->Points[$X][$Y];

         if ( $Value != UNKNOWN && $Value != IGNORED )
          {
           $X1 = floor($X0+$X*$XSize)+$Padding;
           $Y1 = floor($Y0+$Y*$YSize)+$Padding;
           $X2 = floor($X0+$X*$XSize+$XSize);
           $Y2 = floor($Y0+$Y*$YSize+$YSize);

           if ( $Palette != NULL )
            {
             if ( isset($Palette[$Value]) && isset($Palette[$Value]["R"]) ) { $R = $Palette[$Value]["R"]; } else { $R = 0; }
             if ( isset($Palette[$Value]) && isset($Palette[$Value]["G"]) ) { $G = $Palette[$Value]["G"]; } else { $G = 0; }
             if ( isset($Palette[$Value]) && isset($Palette[$Value]["B"]) ) { $B = $Palette[$Value]["B"]; } else { $B = 0; }
             if ( isset($Palette[$Value]) && isset($Palette[$Value]["Alpha"]) ) { $Alpha = $Palette[$Value]["Alpha"]; } else { $Alpha = 1000; }
            }
           else
            {
             $R = (($ShadeR2-$ShadeR1)/100)*$Value + $ShadeR1;
             $G = (($ShadeG2-$ShadeG1)/100)*$Value + $ShadeG1;
             $B = (($ShadeB2-$ShadeB1)/100)*$Value + $ShadeB1;
             $Alpha = (($ShadeA2-$ShadeA1)/100)*$Value + $ShadeA1;
            }

           $Settings = array("R"=>$R,"G"=>$G,"B"=>$B,"Alpha"=>$Alpha);
           if ( $Border ) { $Settings["BorderR"] = $BorderR; $Settings["BorderG"] = $BorderG; $Settings["BorderB"] = $BorderB; }
           if ( $Surrounding != -1 ) { $Settings["BorderR"] = $R+$Surrounding; $Settings["BorderG"] = $G+$Surrounding; $Settings["BorderB"] = $B+$Surrounding; }

           $this->pChartObject->drawFilledRectangle($X1,$Y1,$X2-1,$Y2-1,$Settings);
          }
        }
      }
    }

   /* Compute the missing points */
   function computeMissing()
    {
     $Missing = "";
     for($X=0;$X<=$this->GridSizeX;$X++)
      {
       for($Y=0;$Y<=$this->GridSizeY;$Y++)
        {
         if ( $this->Points[$X][$Y] == UNKNOWN )
          $Missing[] = $X.",".$Y;
        }
      }
     shuffle($Missing);
     
     foreach($Missing as $Key => $Pos)
      {
       $Pos = preg_split("/,/",$Pos);
       $X   = $Pos[0];
       $Y   = $Pos[1];

       if ( $this->Points[$X][$Y] == UNKNOWN )
        {
         $NearestNeighbor = $this->getNearestNeighbor($X,$Y);

         $Value = 0; $Points = 0;
         for($Xi=$X-$NearestNeighbor;$Xi<=$X+$NearestNeighbor;$Xi++)
          {
           for($Yi=$Y-$NearestNeighbor;$Yi<=$Y+$NearestNeighbor;$Yi++)
            {
             if ($Xi >=0 && $Yi >= 0 && $Xi <= $this->GridSizeX && $Yi <= $this->GridSizeY && $this->Points[$Xi][$Yi] != UNKNOWN && $this->Points[$Xi][$Yi] != IGNORED)
              {
               $Value = $Value + $this->Points[$Xi][$Yi]; $Points++;
              }
            }
          }

         if ( $Points != 0 ) { $this->Points[$X][$Y] = $Value / $Points; }
        }
      }
    }

   /* Return the nearest Neighbor distance of a point */
   function getNearestNeighbor($Xp,$Yp)
    {
     $Nearest = UNKNOWN;
     for($X=0;$X<=$this->GridSizeX;$X++)
      {
       for($Y=0;$Y<=$this->GridSizeY;$Y++)
        {
         if ( $this->Points[$X][$Y] != UNKNOWN && $this->Points[$X][$Y] != IGNORED )
          {
           $DistanceX = max($Xp,$X)-min($Xp,$X);
           $DistanceY = max($Yp,$Y)-min($Yp,$Y);
           $Distance  = max($DistanceX,$DistanceY);
           if ( $Distance < $Nearest || $Nearest == UNKNOWN ) { $Nearest = $Distance; }
          }
        }
      }
     return($Nearest);
    }
  }
?>