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 CairoContext::getCurrentPoint ( void ) : array

过程化风格

cairo_get_current_point ( CairoContext $context ) : array

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