Class CanvasScale
(Defined in: jpgraph_canvtools.php : 24)
 
 CanvasScale 
 Set() 
 Translate() 
 TranslateX() 
 TranslateY() 
 __construct() 
 

Class usage and Overview
This class defines a scale which is meant to be used with canvas graphs to make it possibles to pecify a more convinient scale compared to absoilute pixels coordinates.
This will also let you scale the canvas without any coordinate changes.

 


Class Methods

 

CanvasScale ::
Set($xmin, $xmax, $ymin, $ymax)
Specify scale to use

ArgumentDefaultDescription
$xmin 0 Min X value
$xmax 10 Max X-value
$ymin 0 Min Y-value
$ymax 10 Max Y-value

Description:
SPecify min/max values for scale. 

Example:

// Setup a basic canvas we can work 
$g = new CanvasGraph(400,200,'auto');
$g->SetMargin(5,11,6,11);
$g->SetShadow();
$g->SetMarginColor("teal");

// We need to stroke the plotarea and margin before we add the
// text since we otherwise would overwrite the text.
$g->InitFrame();

// Create a new scale
$scale = new CanvasScale($g);
$scale->Set(0,$xmax,0,$ymax);

 

CanvasScale ::
Translate($x, $y)
Translate a point to absolute screen coordinates

ArgumentDefaultDescription
$x  X-value
$y  Y-value

Description:
Translate a point to absolute screen coordinates 
 
See also:

Example:

list($xt,$yt) = $scale->Translate($x,$y);
$graph->img->Point($xt,$yt);

 

CanvasScale ::
TranslateX($x)
Translate X-coordinate

ArgumentDefaultDescription
$x  X-value

Description:
Translate X-value into absolute screen coordinates 
 
See also:

 

CanvasScale ::
TranslateY($y)
Translate Y-value to absolute screen coordinates

ArgumentDefaultDescription
$y  Y-value

Description:
Translate Y-value to absolute screen coordinates 
 
See also:

 

CanvasScale ::
__construct($graph, $xmin, $xmax, $ymin, $ymax)
Define a scale for canvas graphs

ArgumentDefaultDescription
$graph  No description available
$xmin 0 Min X-value for scale
$xmax 10 Max X-value for scale
$ymin 0 Min Y-value for scale
$ymax 10 Max Y-value for scale

Description:
Define a scale for canvas graphs. Note the scale values is optionally in this call. The may be later set witha call to the Set() method. 
 
See also: