<?

  $w = 350;
  $h = 90;

  //how many task, single task or multiple
  $t    = isset( $_GET['t'] ) ? $_GET['t'] : 's';
  if ( $t != 's' ) $t = 'm';

  //when occurs, after time elapses or when starting
  $o    = isset( $_GET['o'] ) ? $_GET['o'] : 's';
  if ( $t != 's' ) $t = 'a';

  //status
  $s    = isset( $_GET['s'] ) ? $_GET['s'] : 'a';
  if ( $s != 'a' ) $s = 'i';

  //estimated
  $estimated    = abs( isset( $_GET['e'] ) ? $_GET['e'] : '1' );

  //when
  $when    = isset( $_GET['w'] ) ? $_GET['w'] : '0';
  
  $im  = imagecreate($w,$h);
  $bg  = imagecolorallocate ($im, 0xFF, 0xFF, 0xFF);
  $fg  = imagecolorallocate ($im, 0x00, 200,  0x00);
  $sc  = imagecolorallocate ($im, 200, 0, 0);
  $gray  = imagecolorallocate ($im, 180,180,180);
  $red   = imagecolorallocate ($im, 200, 0, 0);
  $green = imagecolorallocate ($im, 0, 200,  0);
  $blue  = imagecolorallocate ($im, 0, 0, 200);
  $black = imagecolorallocate ($im, 0, 0, 0);

  imagerectangle($im, 0, 0, $w-1, $h-1, $gray);

//  $incM = $media/60;

//  $mean = 60*$incM;
//  $d = $varianza;
//  if ( $d == 0 ) $d = 0.0001;
   
//	$val1 = 1 / ( sqrt( 2*pi() *$d*$d )); 
// 	$val2 =  -( pow($mean-$mean,2) )/ (pow($d,2));
// 	$y = $val1  * exp ( $val2 );  
//  $incY = 80/$y;

//   $range = 90/ $d;
//   $offsetX = 100 - $mean;
//   $antY = null;
//  for ( $x = $mean -$range*$d ; $x <= $mean +$range*$d; $x++ ) {
//  	$val1 = 1 / ( sqrt( 2*pi() *$d*$d )); 
//  	$val2 =  -( pow($x-$mean,2) )/ (pow($d,2));
//  	$y = $val1  * exp ( $val2 )*$incY;  
//  	if ( $antY != null ) 
//    imageline($im, $x-1+$offsetX, $h - $antY-15, $x+$offsetX, $h-$y-15, $blue);
//    $antY = $y;
//    imageline($im, $x +$mean, $h , $x + $mean, $h-1, $red);
//  }

  function drawTask ( $im, $x1, $x2, $y, $h ) {
  	global $w;
    $blue  = imagecolorallocate ($im, 160, 160, 180);
    $gray  = imagecolorallocate ($im, 100, 100, 100);
    $black = imagecolorallocate ($im, 0, 0, 0);

  	for ( $i = $y; $i < $h ; $i+= 2 ) {
      imageline($im, $x1, $i, $x1 , $i, $gray);
      imageline($im, $x2, $i, $x2 , $i, $gray);
    }

  	for ( $i = $x1; $i < $x2; $i+= 2 ) {
      imageline($im, $i, $y-10 , $i, $y, $blue);
    }
    imagerectangle($im, $x1, $y - 10, $x2, $y, $black);
	};

  function smallTask ($im, $x1, $x2, $y ) {
    $blue  = imagecolorallocate ($im, 160, 160, 180);
    $black = imagecolorallocate ($im, 0, 0, 0);

  	for ( $i = $x1; $i < $x2; $i+= 2 ) {
      imageline($im, $i, $y-8 , $i, $y, $blue);
    }
    imagerectangle($im, $x1, $y - 9, $x2 - 1, $y, $black);
  }
  
  function drawMultipleTask ( $im, $x1, $x2, $y, $h ) {
  	global $w;
  	$terca = ($x2 - $x1 ) / 3;
    $blue  = imagecolorallocate ($im, 160, 160, 180);
    $gray  = imagecolorallocate ($im, 100, 100, 100);
    $black = imagecolorallocate ($im, 0, 0, 0);

  	for ( $i = $y; $i < $h ; $i+= 2 ) {
      imageline($im, $x2, $i, $x2 , $i, $gray);
    }
  	for ( $i = $y-10; $i < $h ; $i+= 2 ) {
      imageline($im, $x1, $i, $x1 , $i, $gray);
    }

    smallTask ( $im, $x1 + 0*$terca, $x1 + 1*$terca, $y -12 );
    smallTask ( $im, $x1 + 1*$terca, $x1 + 2*$terca, $y -6 );
    smallTask ( $im, $x1 + 2*$terca, $x1 + 3*$terca, $y  );
	};

  function drawTimerEvent ( $im, $x1, $y1, $h ) {
    $blue  = imagecolorallocate ($im, 160, 160, 180);
    $red   = imagecolorallocate ($im, 200, 100, 0);
    $gray  = imagecolorallocate ($im, 100, 100, 100);
    $black = imagecolorallocate ($im, 0, 0, 0);
    $yellow = imagecolorallocate ($im, 240, 240, 220);

  	for ( $i = $y1 + 15; $i < $h ; $i+= 2 ) {
      imageline($im, $x1, $i, $x1 , $i, $gray);
    }

    ImageEllipse($im, $x1, $y1, 26, 26, $black);
    ImageEllipse($im, $x1, $y1, 22, 22, $black);
    ImageFilledEllipse($im, $x1, $y1, 16, 16, $yellow );
    ImageEllipse($im, $x1, $y1, 16, 16, $red);
    imageline($im, $x1  , $y1-8 , $x1, $y1+8,  $red);
    //imageline($im, $x1  , $y1+8 , $x1, $y1+6,  $red);
    imageline($im, $x1-8 , $y1 , $x1+8 , $y1,  $red);
    imageline($im, $x1-7 , $y1-4 , $x1+7 , $y1+4,  $red);
    imageline($im, $x1-4 , $y1-7 , $x1+4 , $y1+7,  $red);
    imageline($im, $x1+7 , $y1-4 , $x1-7 , $y1+4,  $red);
    imageline($im, $x1+4 , $y1-7 , $x1-4 , $y1+7,  $red);
    ImageFilledEllipse($im, $x1, $y1, 10, 10, $yellow );
    imageline($im, $x1-1  , $y1+1 , $x1+1, $y1 - 5,  $red);
    imageline($im, $x1-1  , $y1+1   , $x1+3, $y1+1    ,  $red);


  }
 
  imageline($im, 15, $h-19 , $w -15, $h-19, $red);
  imageline($im, $w - 23, $h-23 , $w -15, $h-19, $red);
  imageline($im, $w - 23, $h-15 , $w -15, $h-19, $red);
  imagestring ($im, 2, $w -30 , $h -37, 'days', $red);

  if ( $estimated ==  0  ) {
  	$s = 'i';
    header("Content-Type: image/png");
    imagepng($im);
    die;
  }

  if ( $t == 's' ) 
    drawTask ( $im, 80, 220, $h - 30 , $h -15);
  else
    drawMultipleTask( $im, 80, 220, $h - 30 , $h -15);

    //the zero
  imagestring ($im, 3, 80 -4 , $h -16, '0', $black);
  //the estimated
  imagestring ($im, 2, 220 -4 , $h -16, $estimated, $black);

  
  //when is negative and the event occurs at starting, then this event never will occurs
  if ( $when < 0 && $o == 's' ) {
    $xTimer = 30;
    imagestring ($im, 2, $xTimer -8 , $h -16, $when, $black);
    $s = 'i';
  }

  //when is negative and the event occurs after, then this event will occurs
  if ( $when < 0 && $o == 'a' ) {
  	if ( abs($when) > abs($estimated) ) { //this event is before the start of the task, so will never occurs
      $xTimer = 30;
      $sWhen = abs($when) - abs($estimated);
      imagestring ($im, 2, $xTimer -8 , $h -16, $sWhen, $black);
      $s = 'i';
    }
  	if ( abs($when) < abs($estimated) ) { //this event is after the start of the task, drawing
      $xTimer = 170;
      $sWhen = $estimated + $when;
      imagestring ($im, 2, $xTimer -4 , $h -16, $sWhen, $black);
    }
  	if ( abs($when) == abs($estimated) ) { //this event is exactly at starting 
      $xTimer = 80;
      $sWhen = $estimated + $when;
      imagestring ($im, 2, $xTimer -4 , $h -16, $sWhen, $black);
    }
  }

  //when is positive and the event occurs after, then this event will occurs
  if ( $when > 0 && $o == 'a' ) {
      $xTimer = 270;
      $sWhen = $estimated + $when;
      imagestring ($im, 2, $xTimer -4 , $h -16, $sWhen, $black);
  }

  //when is positive and the event occurs starting, then this event will occurs
  if ( $when > 0 && $o == 's' ) {
  	if ( abs($when) <  abs($estimated) ) $xTimer = 140;
  	if ( abs($when) >  abs($estimated) ) $xTimer = 270;
  	if ( abs($when) == abs($estimated) ) $xTimer = 220;
  	
    imagestring ($im, 2, $xTimer -4 , $h -16, $when, $black);
  }

  if ( $when == 0 ) {
    $xTimer = ( $o == 's' ) ? 80: 220 ;  
  }

  if ( $s == 'a' ) {    
    drawTimerEvent ( $im, $xTimer, $h -70 , $h -15);
  }

  header("Content-Type: image/png");
  imagepng($im);
die;