<?php
/* This library is LGPL
 * written by Louis-Philippe Huberdeau
 *
 * vim: fdm=marker tabstop=4 shiftwidth=4 noet:
 *
 * This file contains the PDF graphic renderer. (Using PDFLib)
 */
require_once('lib/graph-engine/core.php');

class PDFLib_GRenderer extends GRenderer // {{{1
{
	var $pdf;
	var $styles;
	var $font;

	var $width;
	var $height;

	function PDFLib_GRenderer( $format = null, $orientation = 'landscape' ) // {{{2
	{
		// Null size does not create a graphic.
		$this->styles = array();
		$this->font = null;

		if( !is_null( $format ) )
		{
			$size = $this->_getFormat( $format, $orientation );
			$this->width = $size[0];
			$this->height = $size[1];
			
			$this->pdf = pdf_new();
			pdf_open_file( $this->pdf, '' );
			pdf_begin_page( $this->pdf, $this->width, $this->height );

			$this->font = pdf_findfont( $this->pdf, 'Helvetica', 'builtin', 0 );
		}
	}
	
	function addLink( $target, $left, $top, $right, $bottom, $title = null ) // {{{2
	{
	}

	function drawLine( $x1, $y1, $x2, $y2, $style ) // {{{2
	{
		$this->_convertPosition( $x1, $y1 );
		$this->_convertPosition( $x2, $y2 );

		pdf_setcolor( $this->pdf,
			'stroke',
			$style['line'][0],
			$style['line'][1],
			$style['line'][2],
			$style['line'][3],
			$style['line'][4]
		);

		pdf_setlinewidth( $this->pdf, $style['line-width'] );

		pdf_moveto( $this->pdf, $x1, $y1 );
		pdf_lineto( $this->pdf, $x2, $y2 );
		pdf_stroke( $this->pdf );
	}

	function drawRectangle( $left, $top, $right, $bottom, $style ) // {{{2
	{
		$this->_convertPosition( $left, $top );
		$this->_convertPosition( $right, $bottom );

		pdf_setcolor( $this->pdf,
			'stroke',
			$style['line'][0],
			$style['line'][1],
			$style['line'][2],
			$style['line'][3],
			$style['line'][4]
		);

		if( isset( $style['fill'] ) )
			pdf_setcolor( $this->pdf,
				'fill',
				$style['fill'][0],
				$style['fill'][1],
				$style['fill'][2],
				$style['fill'][3],
				$style['fill'][4]
			);

		pdf_setlinewidth( $this->pdf, $style['line-width'] );

		pdf_rect( $this->pdf, $left, $top, $right - $left, $bottom - $top );

		if( isset( $style['fill'] ) )
			pdf_fill_stroke( $this->pdf );
		else
			pdf_stroke( $this->pdf );
	}

	function drawPie( $centerX, $centerY, $radius, $begin, $end, $style ) // {{{2
	{
		$this->_convertPosition( $centerX, $centerY );
		$radius = $radius * min( $this->width, $this->height );

		pdf_setcolor( $this->pdf,
			'stroke',
			$style['line'][0],
			$style['line'][1],
			$style['line'][2],
			$style['line'][3],
			$style['line'][4]
		);

		if( isset( $style['fill'] ) )
			pdf_setcolor( $this->pdf,
				'fill',
				$style['fill'][0],
				$style['fill'][1],
				$style['fill'][2],
				$style['fill'][3],
				$style['fill'][4]
			);

		pdf_setlinewidth( $this->pdf, $style['line-width'] );

		pdf_moveto( $this->pdf, $centerX, $centerY );
		pdf_arc( $this->pdf, $centerX, $centerY, $radius, $begin, $end );
		pdf_lineto( $this->pdf, $centerX, $centerY );

		if( isset( $style['fill'] ) )
			pdf_closepath_fill_stroke( $this->pdf );
		else
			pdf_closepath_stroke( $this->pdf );
	}

	function drawText( $text, $left, $right, $height, $style ) // {{{2
	{
		$h = $height; // Creating duplicate (temp)
		$this->_convertPosition( $left, $height );
		$this->_convertPosition( $right, $h );

		pdf_setcolor( $this->pdf,
			'fill',
			$style['fill'][0],
			$style['fill'][1],
			$style['fill'][2],
			$style['fill'][3],
			$style['fill'][4]
		);

		pdf_setfont( $this->pdf, $this->font, $style['font'] );
		pdf_show_boxed( $this->pdf, $text, $left, $height - $style['font'], $right - $left, $style['font'], $style['align'], '' );
	}

	function getTextWidth( $text, $style ) // {{{2
	{
		return pdf_stringwidth( $this->pdf, $text, $this->font, $style['font'] ) / $this->width;
	}
	
	function getTextHeight( $style ) // {{{2
	{
		return $style['font'] / $this->height;
	}
	
	function getStyle( $name ) // {{{2
	{
		if( isset( $this->styles[$name] ) )
			return $this->styles[$name];

		return $this->styles[$name] = $this->_findStyle( $name );
	}

	function httpOutput( $filename ) // {{{2
	{
		pdf_end_page( $this->pdf );
		pdf_close( $this->pdf );

		$buf = pdf_get_buffer( $this->pdf );
		$len = strlen( $buf );

		header( "Content-type: application/pdf" );
		header( "Content-Length: $len" );
		header( "Content-Disposition: inline; filename=$name" );
		echo $buf;

		pdf_delete( $this->pdf );
	}

	function writeToStream( $stream ) // {{{2
	{
		pdf_end_page( $this->pdf );
		pdf_close( $this->pdf );

		$buf = pdf_get_buffer( $this->pdf );
		fwrite( $stream, $buf );

		pdf_delete( $this->pdf );
	}

	function _convertLength( $value, $type ) // {{{2
	{
		// $type is either 'width' or 'height'
		// $value is a 0-1 float
		return floor( $value * $this->$type );
	}

	function _convertPosition( &$x, &$y ) // {{{2
	{
		// Parameters passed by ref!
		$x = $this->_convertLength( $x, 'width' );
		$y = $this->height - $this->_convertLength( $y, 'height' );
	}

	function _findStyle( $name ) // {{{2
	{
		$parts = explode( '-', $name );
		$style = array();

		switch( $parts[0] )
		{
		case 'Thin':
			$style['line-width'] = 1;
			array_shift( $parts );
			break;
		case 'Bold':
			$style['line-width'] = 2;
			array_shift( $parts );
			break;
		case 'Bolder':
			$style['line-width'] = 3;
			array_shift( $parts );
			break;
		case 'Large':
			$style['font'] = 16;
			array_shift( $parts );
			break;
		case 'Small':
			$style['font'] = 8;
			array_shift( $parts );
			break;
		case 'Normal':
			array_shift( $parts );
		default:
			if( $parts[0] == 'Text' )
				$style['font'] = 12;
			else
				$style['line-width'] = 1;
			break;
		}

		switch( $parts[0] )
		{
		case 'LineStroke':
			$style['line'] = $this->_getColor( $parts[1] );
			break;
		case 'FillStroke':
			$style['fill'] = $this->_getColor( $parts[1] );
			$style['line'] = $this->_getColor( 'Black' );
			break;
		case 'Text':
			$style['fill'] = $this->_getColor( 'Black' );
			if( !isset( $parts[1] ) )
				$parts[1] = null;
			switch( $parts[1] )
			{
			case 'Center':
				$style['align'] = 'center';
				break;
			case 'Right':
				$style['align'] = 'right';
				break;
			case 'Left':
			default:
				$style['align'] = 'left';
				break;
			}
			break;
		default:
			return GRenderer::getStyle( $name );
		}

		return $style;
	}

	function _getColor( $name ) // {{{2
	{
		$c = array( 'rgb' );
		$color = $this->_getRawColor( strtolower( $name ) );
		foreach( $color as $col )
			$c[] = $col / 255;

		$c[] = null;

		return $c;
	}

	function _getFormat( $format, $orientation ) // {{{2
	{
		/*
			Taken from lib/pdflib/class.ezpdf.php
			Copyright notices are in that file.
		*/
		switch (strtoupper($format))
		{
		case '4A0': $size = array(4767.87,6740.79); break;
		case '2A0': $size = array(3370.39,4767.87); break;
		case 'A0': $size = array(2383.94,3370.39); break;
		case 'A1': $size = array(1683.78,2383.94); break;
		case 'A2': $size = array(1190.55,1683.78); break;
		case 'A3': $size = array(841.89,1190.55); break;
		case 'A4': $size = array(595.28,841.89); break;
		case 'A5': $size = array(419.53,595.28); break;
		case 'A6': $size = array(297.64,419.53); break;
		case 'A7': $size = array(209.76,297.64); break;
		case 'A8': $size = array(147.40,209.76); break;
		case 'A9': $size = array(104.88,147.40); break;
		case 'A10': $size = array(73.70,104.88); break;
		case 'B0': $size = array(2834.65,4008.19); break;
		case 'B1': $size = array(2004.09,2834.65); break;
		case 'B2': $size = array(1417.32,2004.09); break;
		case 'B3': $size = array(1000.63,1417.32); break;
		case 'B4': $size = array(708.66,1000.63); break;
		case 'B5': $size = array(498.90,708.66); break;
		case 'B6': $size = array(354.33,498.90); break;
		case 'B7': $size = array(249.45,354.33); break;
		case 'B8': $size = array(175.75,249.45); break;
		case 'B9': $size = array(124.72,175.75); break;
		case 'B10': $size = array(87.87,124.72); break;
		case 'C0': $size = array(2599.37,3676.54); break;
		case 'C1': $size = array(1836.85,2599.37); break;
		case 'C2': $size = array(1298.27,1836.85); break;
		case 'C3': $size = array(918.43,1298.27); break;
		case 'C4': $size = array(649.13,918.43); break;
		case 'C5': $size = array(459.21,649.13); break;
		case 'C6': $size = array(323.15,459.21); break;
		case 'C7': $size = array(229.61,323.15); break;
		case 'C8': $size = array(161.57,229.61); break;
		case 'C9': $size = array(113.39,161.57); break;
		case 'C10': $size = array(79.37,113.39); break;
		case 'RA0': $size = array(2437.80,3458.27); break;
		case 'RA1': $size = array(1729.13,2437.80); break;
		case 'RA2': $size = array(1218.90,1729.13); break;
		case 'RA3': $size = array(864.57,1218.90); break;
		case 'RA4': $size = array(609.45,864.57); break;
		case 'SRA0': $size = array(2551.18,3628.35); break;
		case 'SRA1': $size = array(1814.17,2551.18); break;
		case 'SRA2': $size = array(1275.59,1814.17); break;
		case 'SRA3': $size = array(907.09,1275.59); break;
		case 'SRA4': $size = array(637.80,907.09); break;
		case 'LETTER': $size = array(612.00,792.00); break;
		case 'LEGAL': $size = array(612.00,1008.00); break;
		case 'EXECUTIVE': $size = array(521.86,756.00); break;
		case 'FOLIO': $size = array(612.00,936.00); break;
		}

		if( strtolower($orientation) == 'landscape' )
		{
			$a=$size[1];
			$size[1]=$size[0];
			$size[0]=$a;
		}

		return $size;
	}
} // }}}1
