<?php
/**
* File containing the ezcGraphCairoDriver class
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
* @package Graph
* @version //autogentag//
* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
*/
/**
* Extension of the basic driver package to utilize the cairo library.
*
* This drivers options are defined in the class
* {@link ezcGraphCairoDriverOptions} extending the basic driver options class
* {@link ezcGraphDriverOptions}.
*
* As this is the default driver you do not need to explicitely set anything to
* use it, but may use some of its advanced features.
*
* <code>
* $graph = new ezcGraphPieChart();
* $graph->background->color = '#FFFFFFFF';
* $graph->title = 'Access statistics';
* $graph->legend = false;
*
* $graph->data['Access statistics'] = new ezcGraphArrayDataSet( array(
* 'Mozilla' => 19113,
* 'Explorer' => 10917,
* 'Opera' => 1464,
* 'Safari' => 652,
* 'Konqueror' => 474,
* ) );
*
* $graph->renderer = new ezcGraphRenderer3d();
* $graph->renderer->options->pieChartShadowSize = 10;
* $graph->renderer->options->pieChartGleam = .5;
* $graph->renderer->options->dataBorder = false;
* $graph->renderer->options->pieChartHeight = 16;
* $graph->renderer->options->legendSymbolGleam = .5;
*
* // Use cairo driver
* $graph->driver = new ezcGraphCairoDriver();
*
* $graph->render( 400, 200, 'tutorial_driver_cairo.png' );
* </code>
*
* @version //autogentag//
* @package Graph
* @mainclass
*/
class ezcGraphCairoDriver extends ezcGraphDriver
{
/**
* Surface for cairo
*
* @var resource
*/
protected $surface;
/**
* Current cairo context.
*
* @var resource
*/
protected $context;
/**
* List of strings to draw
* array ( array(
* 'text' => array( 'strings' ),
* 'options' => ezcGraphFontOptions,
* )
*
* @var array
*/
protected $strings = array();
/**
* Constructor
*
* @param array $options Default option array
* @return void
* @ignore
*/
public function __construct( array $options = array() )
{
ezcBase::checkDependency( 'Graph', ezcBase::DEP_PHP_EXTENSION, 'cairo_wrapper' );
$this->options = new ezcGraphCairoDriverOptions( $options );
}
/**
* Initilize cairo surface
*
* Initilize cairo surface from values provided in the options object, if
* is has not been already initlized.
*
* @return void
*/
protected function initiliazeSurface()
{
// Immediatly exit, if surface already exists
if ( $this->surface !== null )
{
return;
}
$this->surface = cairo_image_surface_create(
CAIRO_FORMAT_ARGB32,
$this->options->width,
$this->options->height
);
$this->context = cairo_create( $this->surface );
cairo_set_line_width( $this->context, 1 );
}
/**
* Get SVG style definition
*
* Returns a string with SVG style definitions created from color,
* fillstatus and line thickness.
*
* @param ezcGraphColor $color Color
* @param mixed $filled Filled
* @param float $thickness Line thickness.
* @return string Formatstring
*/
protected function getStyle( ezcGraphColor $color, $filled = true, $thickness = 1. )
{
switch ( true )
{
case $color instanceof ezcGraphLinearGradient:
$pattern = cairo_pattern_create_linear(
$color->startPoint->x, $color->startPoint->y,
$color->endPoint->x, $color->endPoint->y
);
cairo_pattern_add_color_stop_rgba (
$pattern,
0,
$color->startColor->red / 255,
$color->startColor->green / 255,
$color->startColor->blue / 255,
1 - $color->startColor->alpha / 255
);
cairo_pattern_add_color_stop_rgba (
$pattern,
1,
$color->endColor->red / 255,
$color->endColor->green / 255,
$color->endColor->blue / 255,
1 - $color->endColor->alpha / 255
);
cairo_set_source( $this->context, $pattern );
cairo_fill( $this->context );
break;
case $color instanceof ezcGraphRadialGradient:
$pattern = cairo_pattern_create_radial(
0, 0, 0,
0, 0, 1
);
cairo_pattern_add_color_stop_rgba (
$pattern,
0,
$color->startColor->red / 255,
$color->startColor->green / 255,
$color->startColor->blue / 255,
1 - $color->startColor->alpha / 255
);
cairo_pattern_add_color_stop_rgba (
$pattern,
1,
$color->endColor->red / 255,
$color->endColor->green / 255,
$color->endColor->blue / 255,
1 - $color->endColor->alpha / 255
);
// Scale pattern, and move it to the correct position
$matrix = cairo_matrix_multiply(
$move = cairo_matrix_create_translate( -$color->center->x, -$color->center->y ),
$scale = cairo_matrix_create_scale( 1 / $color->width, 1 / $color->height )
);
cairo_pattern_set_matrix( $pattern, $matrix );
cairo_set_source( $this->context, $pattern );
cairo_fill( $this->context );
break;
default:
cairo_set_source_rgba(
$this->context,
$color->red / 255,
$color->green / 255,
$color->blue / 255,
1 - $color->alpha / 255
);
break;
}
// Set line width
cairo_set_line_width( $this->context, $thickness );
// Set requested fill state for context
if ( $filled )
{
cairo_fill_preserve( $this->context );
}
}
/**
* Draws a single polygon.
*
* @param array $points Point array
* @param ezcGraphColor $color Polygon color
* @param mixed $filled Filled
* @param float $thickness Line thickness
* @return void
*/
public function drawPolygon( array $points, ezcGraphColor $color, $filled = true, $thickness = 1. )
{
$this->initiliazeSurface();
$path = cairo_new_path( $this->context );
$lastPoint = end( $points );
cairo_move_to( $this->context, $lastPoint->x, $lastPoint->y );
foreach ( $points as $point )
{
cairo_line_to( $this->context, $point->x, $point->y );
}
cairo_close_path( $this->context );
$this->getStyle( $color, $filled, $thickness );
cairo_stroke( $this->context );
return $points;
}
/**
* Draws a line
*
* @param ezcGraphCoordinate $start Start point
* @param ezcGraphCoordinate $end End point
* @param ezcGraphColor $color Line color
* @param float $thickness Line thickness
* @return void
*/
public function drawLine( ezcGraphCoordinate $start, ezcGraphCoordinate $end, ezcGraphColor $color, $thickness = 1. )
{
$this->initiliazeSurface();
$path = cairo_new_path( $this->context );
cairo_move_to( $this->context, $start->x, $start->y );
cairo_line_to( $this->context, $end->x, $end->y );
$this->getStyle( $color, false, $thickness );
cairo_stroke( $this->context );
return array( $start, $end );
}
/**
* Returns boundings of text depending on the available font extension
*
* @param float $size Textsize
* @param ezcGraphFontOptions $font Font
* @param string $text Text
* @return ezcGraphBoundings Boundings of text
*/
protected function getTextBoundings( $size, ezcGraphFontOptions $font, $text )
{
cairo_select_font_face( $this->context, $font->name, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL );
cairo_set_font_size( $this->context, $size );
$extents = cairo_text_extents( $this->context, $text );
return new ezcGraphBoundings(
0,
0,
$extents['width'],
$extents['height']
);
}
/**
* Writes text in a box of desired size
*
* @param string $string Text
* @param ezcGraphCoordinate $position Top left position
* @param float $width Width of text box
* @param float $height Height of text box
* @param int $align Alignement of text
* @param ezcGraphRotation $rotation
* @return void
*/
public function drawTextBox( $string, ezcGraphCoordinate $position, $width, $height, $align, ezcGraphRotation $rotation = null )
{
$this->initiliazeSurface();
$padding = $this->options->font->padding + ( $this->options->font->border !== false ? $this->options->font->borderWidth : 0 );
$width -= $padding * 2;
$height -= $padding * 2;
$textPosition = new ezcGraphCoordinate(
$position->x + $padding,
$position->y + $padding
);
// Try to get a font size for the text to fit into the box
$maxSize = min( $height, $this->options->font->maxFontSize );
$result = false;
for ( $size = $maxSize; $size >= $this->options->font->minFontSize; )
{
$result = $this->testFitStringInTextBox( $string, $position, $width, $height, $size );
if ( is_array( $result ) )
{
break;
}
$size = ( ( $newsize = $size * ( $result ) ) >= $size ? $size - 1 : floor( $newsize ) );
}
if ( !is_array( $result ) )
{
if ( ( $height >= $this->options->font->minFontSize ) &&
( $this->options->autoShortenString ) )
{
$result = $this->tryFitShortenedString( $string, $position, $width, $height, $size = $this->options->font->minFontSize );
}
else
{
throw new ezcGraphFontRenderingException( $string, $this->options->font->minFontSize, $width, $height );
}
}
$this->options->font->minimalUsedFont = $size;
$this->strings[] = array(
'text' => $result,
'position' => $textPosition,
'width' => $width,
'height' => $height,
'align' => $align,
'font' => $this->options->font,
'rotation' => $rotation,
);
return array(
clone $position,
new ezcGraphCoordinate( $position->x + $width, $position->y ),
new ezcGraphCoordinate( $position->x + $width, $position->y + $height ),
new ezcGraphCoordinate( $position->x, $position->y + $height ),
);
}
/**
* Render text depending of font type and available font extensions
*
* @param string $id
* @param string $text
* @param string $font
* @param ezcGraphColor $color
* @param ezcGraphCoordinate $position
* @param float $size
* @param float $rotation
* @return void
*/
protected function renderText( $text, $font, ezcGraphColor $color, ezcGraphCoordinate $position, $size, $rotation = null )
{
cairo_select_font_face( $this->context, $font, CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL );
cairo_set_font_size( $this->context, $size );
// Store current state of context
cairo_save( $this->context );
cairo_move_to( $this->context, 0, 0 );
if ( $rotation !== null )
{
// Move to the center
cairo_translate( $this->context,
$rotation->getCenter()->x,
$rotation->getCenter()->y
);
// Rotate around text center
cairo_rotate( $this->context,
deg2rad( $rotation->getRotation() )
);
// Center the text
cairo_translate( $this->context,
$position->x - $rotation->getCenter()->x,
$position->y - $rotation->getCenter()->y - $size * .15
);
} else {
cairo_translate( $this->context,
$position->x,
$position->y - $size * .15
);
}
cairo_new_path( $this->context );
$this->getStyle( $color, true );
cairo_show_text( $this->context, $text );
cairo_stroke( $this->context );
// Restore state of context
cairo_restore( $this->context );
}
/**
* Draw all collected texts
*
* The texts are collected and their maximum possible font size is
* calculated. This function finally draws the texts on the image, this
* delayed drawing has two reasons:
*
* 1) This way the text strings are always on top of the image, what
* results in better readable texts
* 2) The maximum possible font size can be calculated for a set of texts
* with the same font configuration. Strings belonging to one chart
* element normally have the same font configuration, so that all texts
* belonging to one element will have the same font size.
*
* @access protected
* @return void
*/
protected function drawAllTexts()
{
$this->initiliazeSurface();
foreach ( $this->strings as $text )
{
$size = $text['font']->minimalUsedFont;
$completeHeight = count( $text['text'] ) * $size + ( count( $text['text'] ) - 1 ) * $this->options->lineSpacing;
// Calculate y offset for vertical alignement
switch ( true )
{
case ( $text['align'] & ezcGraph::BOTTOM ):
$yOffset = $text['height'] - $completeHeight;
break;
case ( $text['align'] & ezcGraph::MIDDLE ):
$yOffset = ( $text['height'] - $completeHeight ) / 2;
break;
case ( $text['align'] & ezcGraph::TOP ):
default:
$yOffset = 0;
break;
}
$padding = $text['font']->padding + $text['font']->borderWidth / 2;
if ( $this->options->font->minimizeBorder === true )
{
// Calculate maximum width of text rows
$width = false;
foreach ( $text['text'] as $line )
{
$string = implode( ' ', $line );
$boundings = $this->getTextBoundings( $size, $text['font'], $string );
if ( ( $width === false) || ( $boundings->width > $width ) )
{
$width = $boundings->width;
}
}
switch ( true )
{
case ( $text['align'] & ezcGraph::CENTER ):
$xOffset = ( $text['width'] - $width ) / 2;
break;
case ( $text['align'] & ezcGraph::RIGHT ):
$xOffset = $text['width'] - $width;
break;
case ( $text['align'] & ezcGraph::LEFT ):
default:
$xOffset = 0;
break;
}
$borderPolygonArray = array(
new ezcGraphCoordinate(
$text['position']->x - $padding + $xOffset,
$text['position']->y - $padding + $yOffset
),
new ezcGraphCoordinate(
$text['position']->x + $padding * 2 + $xOffset + $width,
$text['position']->y - $padding + $yOffset
),
new ezcGraphCoordinate(
$text['position']->x + $padding * 2 + $xOffset + $width,
$text['position']->y + $padding * 2 + $yOffset + $completeHeight
),
new ezcGraphCoordinate(
$text['position']->x - $padding + $xOffset,
$text['position']->y + $padding * 2 + $yOffset + $completeHeight
),
);
}
else
{
$borderPolygonArray = array(
new ezcGraphCoordinate(
$text['position']->x - $padding,
$text['position']->y - $padding
),
new ezcGraphCoordinate(
$text['position']->x + $padding * 2 + $text['width'],
$text['position']->y - $padding
),
new ezcGraphCoordinate(
$text['position']->x + $padding * 2 + $text['width'],
$text['position']->y + $padding * 2 + $text['height']
),
new ezcGraphCoordinate(
$text['position']->x - $padding,
$text['position']->y + $padding * 2 + $text['height']
),
);
}
if ( $text['rotation'] !== null )
{
foreach ( $borderPolygonArray as $nr => $point )
{
$borderPolygonArray[$nr] = $text['rotation']->transformCoordinate( $point );
}
}
if ( $text['font']->background !== false )
{
$this->drawPolygon(
$borderPolygonArray,
$text['font']->background,
true
);
}
if ( $text['font']->border !== false )
{
$this->drawPolygon(
$borderPolygonArray,
$text['font']->border,
false,
$text['font']->borderWidth
);
}
// Render text with evaluated font size
$completeString = '';
foreach ( $text['text'] as $line )
{
$string = implode( ' ', $line );
$completeString .= $string;
$boundings = $this->getTextBoundings( $size, $text['font'], $string );
$text['position']->y += $size;
switch ( true )
{
case ( $text['align'] & ezcGraph::LEFT ):
$position = new ezcGraphCoordinate(
$text['position']->x,
$text['position']->y + $yOffset
);
break;
case ( $text['align'] & ezcGraph::RIGHT ):
$position = new ezcGraphCoordinate(
$text['position']->x + ( $text['width'] - $boundings->width ),
$text['position']->y + $yOffset
);
break;
case ( $text['align'] & ezcGraph::CENTER ):
$position = new ezcGraphCoordinate(
$text['position']->x + ( ( $text['width'] - $boundings->width ) / 2 ),
$text['position']->y + $yOffset
);
break;
}
// Optionally draw text shadow
if ( $text['font']->textShadow === true )
{
$this->renderText(
$string,
$text['font']->name,
$text['font']->textShadowColor,
new ezcGraphCoordinate(
$position->x + $text['font']->textShadowOffset,
$position->y + $text['font']->textShadowOffset
),
$size,
$text['rotation']
);
}
// Finally draw text
$this->renderText(
$string,
$text['font']->name,
$text['font']->color,
$position,
$size,
$text['rotation']
);
$text['position']->y += $size * $this->options->lineSpacing;
}
}
}
/**
* Draws a sector of cirlce
*
* @param ezcGraphCoordinate $center Center of circle
* @param mixed $width Width
* @param mixed $height Height
* @param mixed $startAngle Start angle of circle sector
* @param mixed $endAngle End angle of circle sector
* @param ezcGraphColor $color Color
* @param mixed $filled Filled;
* @return void
*/
public function drawCircleSector( ezcGraphCoordinate $center, $width, $height, $startAngle, $endAngle, ezcGraphColor $color, $filled = true )
{
$this->initiliazeSurface();
// Normalize angles
if ( $startAngle > $endAngle )
{
$tmp = $startAngle;
$startAngle = $endAngle;
$endAngle = $tmp;
}
cairo_save( $this->context );
// Draw circular arc path
$path = cairo_new_path( $this->context );
cairo_translate( $this->context,
$center->x,
$center->y
);
cairo_scale( $this->context,
1, $height / $width
);
cairo_move_to( $this->context, 0, 0 );
cairo_arc( $this->context,
0., 0.,
$width / 2,
deg2rad( $startAngle ),
deg2rad( $endAngle )
);
cairo_line_to( $this->context, 0, 0 );
cairo_restore( $this->context );
$this->getStyle( $color, $filled );
cairo_stroke( $this->context );
// Create polygon array to return
$polygonArray = array( $center );
for ( $angle = $startAngle; $angle < $endAngle; $angle += $this->options->imageMapResolution )
{
$polygonArray[] = new ezcGraphCoordinate(
$center->x +
( ( cos( deg2rad( $angle ) ) * $width ) / 2 ),
$center->y +
( ( sin( deg2rad( $angle ) ) * $height ) / 2 )
);
}
$polygonArray[] = new ezcGraphCoordinate(
$center->x +
( ( cos( deg2rad( $endAngle ) ) * $width ) / 2 ),
$center->y +
( ( sin( deg2rad( $endAngle ) ) * $height ) / 2 )
);
return $polygonArray;
}
/**
* Draws a circular arc consisting of several minor steps on the bounding
* lines.
*
* @param ezcGraphCoordinate $center
* @param mixed $width
* @param mixed $height
* @param mixed $size
* @param mixed $startAngle
* @param mixed $endAngle
* @param ezcGraphColor $color
* @param bool $filled
* @return string Element id
*/
protected function simulateCircularArc( ezcGraphCoordinate $center, $width, $height, $size, $startAngle, $endAngle, ezcGraphColor $color, $filled )
{
for (
$tmpAngle = min( ceil ( $startAngle / 180 ) * 180, $endAngle );
$tmpAngle <= $endAngle;
$tmpAngle = min( ceil ( $startAngle / 180 + 1 ) * 180, $endAngle ) )
{
$path = cairo_new_path( $this->context );
cairo_move_to( $this->context,
$center->x + cos( deg2rad( $startAngle ) ) * $width / 2,
$center->y + sin( deg2rad( $startAngle ) ) * $height / 2
);
// @TODO: Use cairo_curve_to()
for(
$angle = $startAngle;
$angle <= $tmpAngle;
$angle = min( $angle + $this->options->circleResolution, $tmpAngle ) )
{
cairo_line_to( $this->context,
$center->x + cos( deg2rad( $angle ) ) * $width / 2,
$center->y + sin( deg2rad( $angle ) ) * $height / 2 + $size
);
if ( $angle === $tmpAngle )
{
break;
}
}
for(
$angle = $tmpAngle;
$angle >= $startAngle;
$angle = max( $angle - $this->options->circleResolution, $startAngle ) )
{
cairo_line_to( $this->context,
$center->x + cos( deg2rad( $angle ) ) * $width / 2,
$center->y + sin( deg2rad( $angle ) ) * $height / 2
);
if ( $angle === $startAngle )
{
break;
}
}
cairo_close_path( $this->context );
$this->getStyle( $color, $filled );
cairo_stroke( $this->context );
$startAngle = $tmpAngle;
if ( $tmpAngle === $endAngle )
{
break;
}
}
}
/**
* Draws a circular arc
*
* @param ezcGraphCoordinate $center Center of ellipse
* @param integer $width Width of ellipse
* @param integer $height Height of ellipse
* @param integer $size Height of border
* @param float $startAngle Starting angle of circle sector
* @param float $endAngle Ending angle of circle sector
* @param ezcGraphColor $color Color of Border
* @param bool $filled
* @return void
*/
public function drawCircularArc( ezcGraphCoordinate $center, $width, $height, $size, $startAngle, $endAngle, ezcGraphColor $color, $filled = true )
{
$this->initiliazeSurface();
// Normalize angles
if ( $startAngle > $endAngle )
{
$tmp = $startAngle;
$startAngle = $endAngle;
$endAngle = $tmp;
}
$this->simulateCircularArc( $center, $width, $height, $size, $startAngle, $endAngle, $color, $filled );
if ( ( $this->options->shadeCircularArc !== false ) &&
$filled )
{
$gradient = new ezcGraphLinearGradient(
new ezcGraphCoordinate(
$center->x - $width,
$center->y
),
new ezcGraphCoordinate(
$center->x + $width,
$center->y
),
ezcGraphColor::fromHex( '#FFFFFF' )->transparent( $this->options->shadeCircularArc * 1.5 ),
ezcGraphColor::fromHex( '#000000' )->transparent( $this->options->shadeCircularArc * 1.5 )
);
$this->simulateCircularArc( $center, $width, $height, $size, $startAngle, $endAngle, $gradient, $filled );
}
// Create polygon array to return
$polygonArray = array();
for ( $angle = $startAngle; $angle < $endAngle; $angle += $this->options->imageMapResolution )
{
$polygonArray[] = new ezcGraphCoordinate(
$center->x +
( ( cos( deg2rad( $angle ) ) * $width ) / 2 ),
$center->y +
( ( sin( deg2rad( $angle ) ) * $height ) / 2 )
);
}
$polygonArray[] = new ezcGraphCoordinate(
$center->x +
( ( cos( deg2rad( $endAngle ) ) * $width ) / 2 ),
$center->y +
( ( sin( deg2rad( $endAngle ) ) * $height ) / 2 )
);
for ( $angle = $endAngle; $angle > $startAngle; $angle -= $this->options->imageMapResolution )
{
$polygonArray[] = new ezcGraphCoordinate(
$center->x +
( ( cos( deg2rad( $angle ) ) * $width ) / 2 ) + $size,
$center->y +
( ( sin( deg2rad( $angle ) ) * $height ) / 2 )
);
}
$polygonArray[] = new ezcGraphCoordinate(
$center->x +
( ( cos( deg2rad( $startAngle ) ) * $width ) / 2 ) + $size,
$center->y +
( ( sin( deg2rad( $startAngle ) ) * $height ) / 2 )
);
return $polygonArray;
}
/**
* Draw circle
*
* @param ezcGraphCoordinate $center Center of ellipse
* @param mixed $width Width of ellipse
* @param mixed $height height of ellipse
* @param ezcGraphColor $color Color
* @param mixed $filled Filled
* @return void
*/
public function drawCircle( ezcGraphCoordinate $center, $width, $height, ezcGraphColor $color, $filled = true )
{
$this->initiliazeSurface();
cairo_save( $this->context );
// Draw circular arc path
$path = cairo_new_path( $this->context );
cairo_translate( $this->context,
$center->x,
$center->y
);
cairo_scale( $this->context,
1, $height / $width
);
cairo_arc( $this->context,
0., 0.,
$width / 2,
0, 2 * M_PI
);
cairo_restore( $this->context );
$this->getStyle( $color, $filled );
cairo_stroke( $this->context );
// Create polygon array to return
$polygonArray = array();
for ( $angle = 0; $angle < ( 2 * M_PI ); $angle += deg2rad( $this->options->imageMapResolution ) )
{
$polygonArray[] = new ezcGraphCoordinate(
$center->x +
( ( cos( $angle ) * $width ) / 2 ),
$center->y +
( ( sin( $angle ) * $height ) / 2 )
);
}
return $polygonArray;
}
/**
* Draw an image
*
* The image will be inlined in the SVG document using data URL scheme. For
* this the mime type and base64 encoded file content will be merged to
* URL.
*
* @param mixed $file Image file
* @param ezcGraphCoordinate $position Top left position
* @param mixed $width Width of image in destination image
* @param mixed $height Height of image in destination image
* @return void
*/
public function drawImage( $file, ezcGraphCoordinate $position, $width, $height )
{
$this->initiliazeSurface();
// Ensure given bitmap is a PNG image
$data = getimagesize( $file );
if ( $data[2] !== IMAGETYPE_PNG )
{
throw new Exception( 'Cairo only has support for PNGs.' );
}
// Create new surface from given bitmap
$imageSurface = cairo_image_surface_create_from_png( $file );
// Create pattern from source image to be able to transform it
$pattern = cairo_pattern_create_for_surface( $imageSurface );
// Scale pattern to defined dimensions and move it to its destination position
$matrix = cairo_matrix_multiply(
$move = cairo_matrix_create_translate( -$position->x, -$position->y ),
$scale = cairo_matrix_create_scale( $data[0] / $width, $data[1] / $height )
);
cairo_pattern_set_matrix( $pattern, $matrix );
// Merge surfaces
cairo_set_source( $this->context, $pattern );
cairo_rectangle( $this->context, $position->x, $position->y, $width, $height );
cairo_fill( $this->context );
}
/**
* Return mime type for current image format
*
* @return string
*/
public function getMimeType()
{
return 'image/png';
}
/**
* Render image directly to output
*
* The method renders the image directly to the standard output. You
* normally do not want to use this function, because it makes it harder
* to proper cache the generated graphs.
*
* @return void
*/
public function renderToOutput()
{
$this->drawAllTexts();
header( 'Content-Type: ' . $this->getMimeType() );
// Write to tmp file, echo and remove tmp file again.
$fileName = tempnam( '/tmp', 'ezc' );
// cairo_surface_write_to_png( $this->surface, $file );
cairo_surface_write_to_png( $this->surface, $fileName );
$contents = file_get_contents( $fileName );
unlink( $fileName );
// Directly echo contents
echo $contents;
}
/**
* Finally save image
*
* @param string $file Destination filename
* @return void
*/
public function render( $file )
{
$this->drawAllTexts();
cairo_surface_write_to_png( $this->surface, $file );
}
/**
* Get resource of rendered result
*
* Return the resource of the rendered result. You should not use this
* method before you called either renderToOutput() or render(), as the
* image may not be completely rendered until then.
*
* This method returns an array, containing the surface and the context in
* a structure like:
* <code>
* array(
* 'surface' => resource,
* 'context' => resource,
* )
* </code>
*
* @return array
*/
public function getResource()
{
return array(
'surface' => $this->surface,
'context' => $this->context,
);
}
}
?>