CLASS Image
(Defined in: jpgraph.php : 3788)
 Image 
 RoundedRectangle() 
 SetAntiAliasing() 
 SetImgFormat() 
 SetMargin() 
 SetTransparent() 
 

Class usage and Overview
The Image class encapsulates the very lowest layer in the jpgraph library. It encapsulates the GD library function and presents a coherent interface hiding som of the details in the setup and management of GD.

By replacing Image (and RotImage) it is possible to change the output driver for the whole library withou any further changes.

A very close related class is RotImage which builds directly on Image but in additoin provides a 2D rotation featire, i.e the image may be rotated around a given point and possible also translated.

The image gets instantiated through in the Graph::Img property, or more accurate the RotImage class gets instantiated. The only method in this class that any end user is likely to need (and use) is the SetMargin() method used to give the margins around between the end of the image and the actual plotarea.

Note that all coordinates in methods belonging to Image is given in direct screen coordinates.

 

See also related classes:
RotImage, RGB and TTF

 


Class Methods

 

 

function RoundedRectangle($xt,$yt,$xr,$yl,$r)
Draw a rectangle with rounded corners

ArgumentDefaultDescription
$xt  Top left X
$yt  Top left Y
$xr  Bottom right X
$yl  Bottom right Y
$r  Corner radius

Description
Draw a rectangle with rounded corners. 

 

 

function SetAntiAliasing()
Specify if anti-aliasing should be used


Description
Specify if anti-aliasing should be used. Enabling anti-aliasing will greatly improve the visual apperance of certain graphs. For example spider graphs greatly benefit from this. Note: Using anti-aliasing makes line drawing roughly 8 time slower than normal lines !! So you image will take longer to construct.  
 
See also
Image::Line

Example

$graph->img->SetAntiAliasing();

 

 

function SetImgFormat($aFormat)
Specify what image format to use

ArgumentDefaultDescription
$aFormat  Image format

Description
Specify image format. Note depending on your installation of PHP not all formats may be supported. Supported formats are:  
 
See also
Image::SetQuality

Example

$graph->img->SetImgFormat('jpeg');

 

 

function SetMargin($lm,$rm,$tm,$bm)
Specify margin for the plot area

ArgumentDefaultDescription
$lm  Left margin
$rm  Right margin
$tm  Top margin
$bm  Bottom margin

Description
Specify margin for the plot area.  

Example

$graph->img->SetMargin(20,20,40,20);

 

 

function SetTransparent($color)
Specify transparent color

ArgumentDefaultDescription
$color  Color

Description
Specify transparent color for image. 

Example

$graph->img->SetTransparent("white");