CairoContext::getCurrentPoint()

(PECL cairo >= 0.1.0)

The getCurrentPoint purpose

说明

面向对象风格

publicCairoContext::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