(PECL cairo >= 0.1.0)
CairoContext::fontExtents -- cairo_font_extents — Get the font extents
Object oriented style (method):
Procedural style:
Gets the font extents for the currently selected font.
Description...
An array containing the font extents for the current font.
Example #1 Object oriented style
<?php
$sur = new CairoImageSurface(CairoFormat::ARGB32, 50, 50);
$con = new CairoContext($sur);
var_dump($con->fontExtents());
?>
以上例程的输出类似于：
array(5) {
["ascent"]=>
float(10)
["descent"]=>
float(3)
["height"]=>
float(13.3125)
["max_x_advance"]=>
float(26.65625)
["max_y_advance"]=>
float(0)
}
Example #2 Procedural style
<?php
$sur = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 50, 50);
$con = cairo_create($sur);
var_dump(cairo_font_extents($con));
?>
以上例程的输出类似于：
array(5) {
["ascent"]=>
float(10)
["descent"]=>
float(3)
["height"]=>
float(13.3125)
["max_x_advance"]=>
float(26.65625)
["max_y_advance"]=>
float(0)
}