CairoContext::getCurrentPoint()
(PECL cairo >= 0.1.0)
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