CairoContext::getCurrentPoint

cairo_get_current_point

(PECL cairo >= 0.1.0)

CairoContext::getCurrentPoint -- cairo_get_current_point — The getCurrentPoint purpose

说明

面向对象风格

public array CairoContext::getCurrentPoint ( void )

过程化风格

array cairo_get_current_point ( CairoContext $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() .

参数

context: A valid CairoContext object.

返回值

An array containing the x (index 0) and y (index 1) coordinates of the current point.

范例

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)
}

参见

CairoContext::moveTo() - The moveTo purpose
CairoContext::hasCurrentPoint() - The hasCurrentPoint purpose