graph_core.php

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<?php

      /*
      *     This source code is a part of the Ultimix Project. 
      *     It is distributed under BSD license. All other third side source code (like tinyMCE) is distributed under 
      *     it's own license wich could be found from the corresponding files or sources. 
      *     This source code is provided "as is" without any warranties or garanties.
      *
      *     Have a nice day!
      *
      *     @url http://ultimix.sorceforge.net
      *
      *     @author Alexey "gdever" Dodonov
      */

      class graph_core_1_0_0{

            function                filledrectangle( $Image , $x1 , $y1 , $x2 , $y2 , $color , $thick = 1 )
            {
                  $t = $thick / 2 - 0.5;

                  return(
                        imagefilledrectangle( 
                              $Image , round( min( $x1 , $x2 ) - $t ) , round( min( $y1 , $y2 ) - $t ) , 
                              round( max( $x1 , $x2 ) + $t ) , round( max( $y1 , $y2 ) + $t ) , $color 
                        )
                  );
            }

            private function  commonimagelinethick( $Image , $x1 , $y1 , $x2 , $y2 , $Color , $Thick = 1 )
            {
                  $t = $Thick / 2 - 0.5;
                $k = ( $y2 - $y1 ) / ( $x2 - $x1 );
                  $a = $t / sqrt( 1 + pow( $k , 2 ) );
                $points = array(
                    round( $x1 - ( 1 + $k ) * $a ) , round( $y1 + ( 1 - $k ) * $a ) , round( $x1 - ( 1 - $k ) * $a ) , 
                        round( $y1 - ( 1 + $k ) * $a ) , round( $x2 + ( 1 + $k ) * $a ) , round( $y2 - ( 1 - $k ) * $a ) , 
                    round( $x2 + ( 1 - $k ) * $a ) , round( $y2 + ( 1 + $k ) * $a ) , 
                );

                imagefilledpolygon( $Image , $points , 4 , $Color );
                return( imagepolygon( $Image , $points , 4 , $Color ) );
            }

            function                imagelinethick( $Image , $x1 , $y1 , $x2 , $y2 , $color , $thick = 1 )
            {
                if( $thick == 1 )
                  {
                        return( imageline( $Image , $x1 , $y1 , $x2 , $y2 , $color ) );
                  }
                elseif( $x1 == $x2 || $y1 == $y2 )
                  {
                    return( $this->filledrectangle( $Image , $x1 , $y1 , $x2 , $y2 , $color , $thick ) );
                }

                  return( $this->commonimagelinethick( $Image , $x1 , $y1 , $x2 , $y2 , $color , $thick ) );
            }
            
            function                get_color_from_hex( $Image , $Color )
            {
                  $Color = intval( $Color );

                  $ColorObject = imagecolorallocate( 
                        $Image , ( $Color & ( 255 << 16 ) ) >> 16 , 
                        ( $Color & ( 255 << 8 ) ) >> 8 , $Color & 255
                  );

                  return( $ColorObject );
            }
            
            function                fill_background( &$Img , $BackgroundColor )
            {
                  try
                  {
                        $BackgroundColor = intval( $BackgroundColor );

                        $BackgroundColor = $this->get_color_from_hex( $Img , $BackgroundColor );

                        $Res = imagefill( $Img , 0 , 0 , $BackgroundColor );

                        if( $Res === false )
                        {
                              throw( new Exception( 'An error occured while setting graph background' ) );
                        }
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                string_width( $FontFile , $Size , $String )
            {
                  try
                  {
                        $Box = imagettfbbox( $Size , 0 , $FontFile , $String );

                        return( $Box[ 2 ] - $Box[ 0 ] );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }

            function                string_height( $FontFile , $Size , $String )
            {
                  try
                  {
                        $Box = imagettfbbox( $Size , 0 , $FontFile , $String );

                        return( abs( $Box[ 5 ] - $Box[ 1 ] ) );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                string_width_height( $FontFile , $Size , $String )
            {
                  try
                  {
                        $Box = imagettfbbox( $Size , 0 , $FontFile , $String );

                        return( array( $Box[ 2 ] - $Box[ 0 ] , abs( $Box[ 5 ] - $Box[ 1 ] ) ) );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }

            function                compile_labels_from_data( $DataY , $StepsY )
            {
                  try
                  {
                        $Labels = array();

                        $MaxY = max( $DataY );
                        $MinY = min( $DataY );
                        $dY = ( $MaxY - $MinY ) / $StepsY;

                        for( $i = 0 ; $i <= $StepsY ; $i++ )
                        {
                              $Labels [] = sprintf( '%.2f' , $MinY + $i * $dY );
                        }

                        return( $Labels );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                output( &$Options , &$Img )
            {
                  try
                  {
                        header( 'Content-type: image/png' );
                        imagepng( $Img );
                        imagedestroy( $Img );
                        exit( 0 );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
      }
      
?>