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eZ Components 2009.2

Graph: ezcGraphCairoDriver

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Class: ezcGraphCairoDriver

Extension of the basic driver package to utilize the cairo library. [source]
This drivers options are defined in the class ezcGraphCairoDriverOptions extending the basic driver options class 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.
 1.    $graph = new ezcGraphPieChart();
 2.    $graph->background->color = '#FFFFFFFF';
 3.    $graph->title = 'Access statistics';
 4.    $graph->legend = false;
 5.  
 6.    $graph->data['Access statistics'] = new ezcGraphArrayDataSet( array(
 7.        'Mozilla' => 19113,
 8.        'Explorer' => 10917,
 9.        'Opera' => 1464,
10.        'Safari' => 652,
11.        'Konqueror' => 474,
12.    ) );
13.  
14.    $graph->renderer = new ezcGraphRenderer3d();
15.    $graph->renderer->options->pieChartShadowSize = 10;
16.    $graph->renderer->options->pieChartGleam = .5;
17.    $graph->renderer->options->dataBorder = false;
18.    $graph->renderer->options->pieChartHeight = 16;
19.    $graph->renderer->options->legendSymbolGleam = .5;
20.  
21.    // Use cairo driver
22.    $graph->driver = new ezcGraphCairoDriver();
23.  
24.    $graph->render( 400, 200, 'tutorial_driver_cairo.png' );

Parents

ezcGraphDriver
   |
   --ezcGraphCairoDriver

Member Variables

protected resource $context
Current cairo context.
protected array $strings = array()
List of strings to draw

array ( array( 'text' => array( 'strings' ), 'options' => ezcGraphFontOptions, )
protected resource $surface
Surface for cairo

Inherited Member Variables

From ezcGraphDriver:
protected  ezcGraphDriver::$options

Method Summary

protected void drawAllTexts( )
Draw all collected texts
public void drawCircle( $center, $width, $height, $color, [$filled = true] )
Draw circle
public void drawCircleSector( $center, $width, $height, $startAngle, $endAngle, $color, [$filled = true] )
Draws a sector of cirlce
public void drawCircularArc( $center, $width, $height, $size, $startAngle, $endAngle, $color, [$filled = true] )
Draws a circular arc
public void drawImage( $file, $position, $width, $height )
Draw an image
public void drawLine( $start, $end, $color, [$thickness = 1.] )
Draws a line
public void drawPolygon( $points, $color, [$filled = true], [$thickness = 1.] )
Draws a single polygon.
public void drawTextBox( $string, $position, $width, $height, $align, [$rotation = null] )
Writes text in a box of desired size
public string getMimeType( )
Return mime type for current image format
public array getResource( )
Get resource of rendered result
protected string getStyle( $color, [$filled = true], [$thickness = 1.] )
Get SVG style definition
protected ezcGraphBoundings getTextBoundings( $size, $font, $text )
Returns boundings of text depending on the available font extension
protected void initiliazeSurface( )
Initilize cairo surface
public void render( $file )
Finally save image
protected void renderText( $text, $font, $color, $position, $size, [$rotation = null], $id )
Render text depending of font type and available font extensions
public void renderToOutput( )
Render image directly to output
protected string simulateCircularArc( $center, $width, $height, $size, $startAngle, $endAngle, $color, $filled )
Draws a circular arc consisting of several minor steps on the bounding lines.

Inherited Methods

From ezcGraphDriver :
public abstract void ezcGraphDriver::drawCircle()
Draw circle
public abstract void ezcGraphDriver::drawCircleSector()
Draws a sector of cirlce
public abstract void ezcGraphDriver::drawCircularArc()
Draws a circular arc
public abstract void ezcGraphDriver::drawImage()
Draw an image
public abstract void ezcGraphDriver::drawLine()
Draws a line
public abstract void ezcGraphDriver::drawPolygon()
Draws a single polygon.
public abstract void ezcGraphDriver::drawTextBox()
Writes text in a box of desired size
public abstract string ezcGraphDriver::getMimeType()
Return mime type for current image format
protected abstract ezcGraphBoundings ezcGraphDriver::getTextBoundings()
Returns boundings of text depending on the available font extension
protected array ezcGraphDriver::reduceEllipseSize()
Reduce the size of an ellipse
protected array( ezcGraphDriver::reducePolygonSize()
Reduces the size of a polygon
public abstract void ezcGraphDriver::render()
Finally save image
public void ezcGraphDriver::renderToOutput()
Render image directly to output
protected mixed ezcGraphDriver::testFitStringInTextBox()
Test if string fits in a box with given font size
protected void ezcGraphDriver::tryFitShortenedString()
If it is allow to shortened the string, this method tries to extract as many chars as possible to display a decent amount of characters.

Methods

drawAllTexts

void drawAllTexts( )
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.

drawCircle

void drawCircle( ezcGraphCoordinate $center, mixed $width, mixed $height, ezcGraphColor $color, [mixed $filled = true] )
Draw circle

Parameters

Name Type Description
$center ezcGraphCoordinate Center of ellipse
$width mixed Width of ellipse
$height mixed height of ellipse
$color ezcGraphColor Color
$filled mixed Filled

Redefinition of

Method Description
ezcGraphDriver::drawCircle() Draw circle

drawCircleSector

void drawCircleSector( ezcGraphCoordinate $center, mixed $width, mixed $height, mixed $startAngle, mixed $endAngle, ezcGraphColor $color, [mixed $filled = true] )
Draws a sector of cirlce

Parameters

Name Type Description
$center ezcGraphCoordinate Center of circle
$width mixed Width
$height mixed Height
$startAngle mixed Start angle of circle sector
$endAngle mixed End angle of circle sector
$color ezcGraphColor Color
$filled mixed Filled;

Redefinition of

Method Description
ezcGraphDriver::drawCircleSector() Draws a sector of cirlce

drawCircularArc

void drawCircularArc( ezcGraphCoordinate $center, integer $width, integer $height, integer $size, float $startAngle, float $endAngle, ezcGraphColor $color, [bool $filled = true] )
Draws a circular arc

Parameters

Name Type Description
$center ezcGraphCoordinate Center of ellipse
$width integer Width of ellipse
$height integer Height of ellipse
$size integer Height of border
$startAngle float Starting angle of circle sector
$endAngle float Ending angle of circle sector
$color ezcGraphColor Color of Border
$filled bool  

Redefinition of

Method Description
ezcGraphDriver::drawCircularArc() Draws a circular arc

drawImage

void drawImage( mixed $file, ezcGraphCoordinate $position, mixed $width, mixed $height )
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.

Parameters

Name Type Description
$file mixed Image file
$position ezcGraphCoordinate Top left position
$width mixed Width of image in destination image
$height mixed Height of image in destination image

Redefinition of

Method Description
ezcGraphDriver::drawImage() Draw an image

drawLine

void drawLine( ezcGraphCoordinate $start, ezcGraphCoordinate $end, ezcGraphColor $color, [float $thickness = 1.] )
Draws a line

Parameters

Name Type Description
$start ezcGraphCoordinate Start point
$end ezcGraphCoordinate End point
$color ezcGraphColor Line color
$thickness float Line thickness

Redefinition of

Method Description
ezcGraphDriver::drawLine() Draws a line

drawPolygon

void drawPolygon( $points, ezcGraphColor $color, [mixed $filled = true], [float $thickness = 1.] )
Draws a single polygon.

Parameters

Name Type Description
$points array Point array
$color ezcGraphColor Polygon color
$filled mixed Filled
$thickness float Line thickness

Redefinition of

Method Description
ezcGraphDriver::drawPolygon() Draws a single polygon.

drawTextBox

void drawTextBox( string $string, ezcGraphCoordinate $position, float $width, float $height, int $align, [ $rotation = null] )
Writes text in a box of desired size

Parameters

Name Type Description
$string string Text
$position ezcGraphCoordinate Top left position
$width float Width of text box
$height float Height of text box
$align int Alignement of text
$rotation ezcGraphRotation  

Redefinition of

Method Description
ezcGraphDriver::drawTextBox() Writes text in a box of desired size

getMimeType

string getMimeType( )
Return mime type for current image format

Redefinition of

Method Description
ezcGraphDriver::getMimeType() Return mime type for current image format

getResource

array getResource( )
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: 
 1.   array(
 2.       'surface' => resource,
 3.       'context' => resource,
 4.   )

getStyle

string getStyle( ezcGraphColor $color, [mixed $filled = true], [float $thickness = 1.] )
Get SVG style definition
Returns a string with SVG style definitions created from color, fillstatus and line thickness.

Parameters

Name Type Description
$color ezcGraphColor Color
$filled mixed Filled
$thickness float Line thickness.

getTextBoundings

ezcGraphBoundings getTextBoundings( float $size, ezcGraphFontOptions $font, string $text )
Returns boundings of text depending on the available font extension

Parameters

Name Type Description
$size float Textsize
$font ezcGraphFontOptions Font
$text string Text

Redefinition of

Method Description
ezcGraphDriver::getTextBoundings() Returns boundings of text depending on the available font extension

initiliazeSurface

void initiliazeSurface( )
Initilize cairo surface
Initilize cairo surface from values provided in the options object, if is has not been already initlized.

render

void render( string $file )
Finally save image

Parameters

Name Type Description
$file string Destination filename

Redefinition of

Method Description
ezcGraphDriver::render() Finally save image

renderText

void renderText( string $text, string $font, ezcGraphColor $color, ezcGraphCoordinate $position, float $size, [float $rotation = null], string $id )
Render text depending of font type and available font extensions

Parameters

Name Type Description
$id string  
$text string  
$font string  
$color ezcGraphColor  
$position ezcGraphCoordinate  
$size float  
$rotation float  

renderToOutput

void renderToOutput( )
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.

Redefinition of

Method Description
ezcGraphDriver::renderToOutput() Render image directly to output

simulateCircularArc

string simulateCircularArc( ezcGraphCoordinate $center, mixed $width, mixed $height, mixed $size, mixed $startAngle, mixed $endAngle, ezcGraphColor $color, bool $filled )
Draws a circular arc consisting of several minor steps on the bounding lines.

Parameters

Name Type Description
$center ezcGraphCoordinate  
$width mixed  
$height mixed  
$size mixed  
$startAngle mixed  
$endAngle mixed  
$color ezcGraphColor  
$filled bool  

Last updated: Mon, 21 Dec 2009