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(PECL cairo >= 0.1.0)
CairoContext::getCurrentPoint -- cairo_get_current_point — The getCurrentPoint purpose
面向对象风格
过程化风格
$context
)Gets the current point of the current path, which is conceptually the final point reached by the path so far.
The current point is returned in the user-space coordinate system. If there is no defined current point or if cr is in an error status, x and y will both be set to 0.0. It is possible to check this in advance with CairoContext::hasCurrentPoint() .
Most path construction functions alter the current point. See the following for details on how they affect the current point: CairoContext::newPath() , CairoContext::newSubPath() , CairoContext::appendPath() , CairoContext::closePath() , CairoContext::moveTo() , CairoContext::lineTo() , CairoContext::curveTo() , CairoContext::relMoveTo() , CairoContext::relLineTo() , CairoContext::relCurveTo() , CairoContext::arc() , CairoContext::arcNegative() , CairoContext::rectangle() , CairoContext::textPath() , CairoContext::glyphPath() .
Some functions use and alter the current point but do not otherwise change current path: CairoContext::showText() .
Some functions unset the current path and as a result, current point: CairoContext::fill() , CairoContext::stroke() .
context
A valid CairoContext object.
An array containing the x (index 0) and y (index 1) coordinates of the current point.
Example #1 面向对象风格
<?php
$s = new CairoImageSurface ( CairoFormat :: ARGB32 , 100 , 100 );
$c = new CairoContext ( $s );
$c -> moveTo ( 10 , 10 );
var_dump ( $c -> getCurrentPoint ());
?>
以上例程的输出类似于:
array(2) { [0]=> float(10) [1]=> float(10) }
Example #2 过程化风格
<?php
$s = cairo_image_surface_create ( CAIRO_SURFACE_TYPE_IMAGE , 100 , 100 );
$c = cairo_create ( $s );
cairo_move_to ( $c , 10 , 10 );
var_dump ( cairo_get_current_point ( $c ));
?>
以上例程的输出类似于:
array(2) { [0]=> float(10) [1]=> float(10) }