(Defined in: jpgraph_canvas.php : 20)
Class usage and Overview
If you for some reason just want plain canvas to draw on using the direct drawing method you can create a new canvas with this class.
The canvas is meant to be manipulated through the Image class which can be found as an instance variable ($graph->img) in the canvas class.
Please remeber taht using the drawing methods in the Image class assumes screen (pixels) coordinates.
See also related classes:
Graph
Class Methods
Strokes plot area and margin
Description:
Calling this method will fill the margin (with the margin color) and fill the plot area with the plot color. You should call this method before stroking anything else to the canvas as otherwise what you have stroken will be overwritten.
// 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();
// Draw a text box in the middle
$txt="This\nis\na TEXT!!!";
$t = new Text($txt,200,10);
$t->SetFont(FF_ARIAL,FS_BOLD,40);
// Stroke the text
$t->Stroke($g->img);
// Stroke the graph
$g->Stroke();
Stroke graph to browser or file
| Argument | Default | Description |
|---|
|
$aStrokeFileName
|
""
| Filename to stroke to |
Description:
Stroke a file to browser or file. See Graph::Stroke() for more details.
See also:
$canvas->Stroke();
Construct a new Cnavas graph
| Argument | Default | Description |
|---|
|
$aWidth
|
300
| Width of graph |
|
$aHeight
|
200
| Height of graph |
|
$aCachedName
|
""
| Cache file name |
|
$timeout
|
0
| Cache timeout |
|
$inline
|
1
| Inline or not |
Description:
See Graph::Graph() for description, this method is identical.
See also:
// Create a new canvas and draw a line from top left to
// bottom right
$canvas = new CanvasGraph(300,200);
$canvas->img->SetColor(black*);
$canvas->img->Line(0,0,300,200);
$canvas->Stroke();