CLASS CanvasScale
(Defined in: jpgraph_canvtools.php : 25) 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
function CanvasScale(&$graph,$xmin,$xmax,$ymin,$ymax)
Define a scale for canvas graphs
| Argument | Default | Description |
|---|
|
&$graph
| | Canvas graph |
|
$xmin
|
0
| Min X-value for scale |
|
$xmax
|
10
| Max X-value for scale |
|
$ymin
|
0
| Min Y-value for scale |
|
$ymax
|
10
| Max Y-value for scale |
Description
Define a scale for canvas graphs. Note the scale values is optionally in this call. The may be later set witha call to the Set() method.
See also
CanvasScale::Set
function Set($xmin,$xmax,$ymin,$ymax)
Specify scale to use
| Argument | Default | Description |
|---|
|
$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.
// 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,$ymax);
function Translate($x,$y)
Translate a point to absolute screen coordinates
| Argument | Default | Description |
|---|
|
$x
| | X-value |
|
$y
| | Y-value |
Description
Translate a point to absolute screen coordinates
See also
CanvasScale::TranslateX and CanvasScale::TranslateY
list($xt,$yt) = $scale->Translate($x,$y);
$graph->img->Point($xt,$yt);
function TranslateX($x)
Translate X-coordinate
| Argument | Default | Description |
|---|
|
$x
| | X-value |
Description
Translate X-value into absolute screen coordinates
See also
CanvasScale::Translate
function TranslateY($y)
Translate Y-value to absolute screen coordinates
| Argument | Default | Description |
|---|
|
$y
| | Y-value |
Description
Translate Y-value to absolute screen coordinates
See also
CanvasScale::Translate