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Zeta Components Manual :: Docs For Class ezcGraphSvgDriver

Graph::ezcGraphSvgDriver

Class ezcGraphSvgDriver

Extension of the basic Driver package to utilize the SVGlib.

This drivers options are defined in the class ezcGraphSvgDriverOptions 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.    // SVG driver options
  22.    $graph->driver->options->templateDocument = dirname( __FILE__ ) . '/template.svg';
  23.    $graph->driver->options->graphOffset = new ezcGraphCoordinate( 25, 40 );
  24.    $graph->driver->options->insertIntoGroup = 'ezcGraph';
  25.  
  26.    $graph->render( 400, 200, 'tutorial_driver_svg.svg' );

Source for this file: /Graph/src/driver/svg.php

ezcGraphDriver
   |
   --ezcGraphSvgDriver
Version:   //autogentag//

Member Variables

protected DOMElement $defs
DOMElement containing all svg style definitions
protected DOMDocument $dom
DOM tree of the svg document
protected array $drawnGradients = array()
List of already created gradients
protected int $elementID = 0
Numeric unique element id
protected DOMElement $elements
DOMElement containing all svg objects
protected ezcGraphSvgFont $font = null
Font storage for SVG font glyphs and kernings.
protected array $strings = array()
List of strings to draw

array ( array( 'text' => array( 'strings' ), 'options' => ezcGraphFontOptions, )

Inherited Member Variables

From ezcGraphDriver
protected ezcGraphDriver::$options

Method Summary

protected void createDocument( )
Creates the DOM object to insert SVG nodes in.
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
protected string encode( $string )
Encodes non-utf-8 strings
protected string getGradientUrl( $color )
Return gradient URL
public string getMimeType( )
Return mime type for current image format
public DOMDocument 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 getTextWidth( $string , $size )
Guess text width for string
public void render( $file )
Finally save image
public void renderToOutput( )
Render image directly to output

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

createDocument

void createDocument( )

Creates the DOM object to insert SVG nodes in.

If the DOM document does not exists it will be created or loaded according to the settings.

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

encode

string encode( string $string )

Encodes non-utf-8 strings

Transforms non-utf-8 strings to their hex entities, because ext/DOM fails here with conversion errors.

Parameters:
Name Type Description
$string string

getGradientUrl

string getGradientUrl( ezcGraphColor $color )

Return gradient URL

Creates the definitions needed for a gradient, if a proper gradient does not yet exists. In each case a URL referencing the correct gradient will be returned.

Parameters:
Name Type Description
$color ezcGraphColor Gradient

getMimeType

string getMimeType( )

Return mime type for current image format

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

getResource

DOMDocument 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.

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

getTextWidth

void getTextWidth( mixed $string , mixed $size )

Guess text width for string

The is no way to know the font or fontsize used by the SVG renderer to render the string. We assume some character width defined in the SVG driver options, tu guess the length of a string. We discern between numeric an non numeric strings, because we often use only numeric strings to display chart data and numbers tend to be a bit wider then characters.

Parameters:
Name Type Description
$string mixed
$size mixed

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

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
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