CairoContext::hasCurrentPoint()
(PECL cairo >= 0.1.0)
The hasCurrentPoint purpose
说明
面向对象风格(method):
public CairoContext::hasCurrentPoint(void): bool
过程化风格:
cairo_has_current_point(CairoContext$context): bool
Returns whether a current point is defined on the current path. See CairoContext::getCurrentPoint() for details on the current point.
参数
- $context
A valid CairoContext object.
返回值
Whether a current point is defined
范例
Example #1 面向对象风格
<?php $s = new CairoImageSurface(CairoFormat::ARGB32, 100, 100); $c = new CairoContext($s); var_dump($c->hasCurrentPoint()); $c->moveTo(10, 10); var_dump($c->hasCurrentPoint()); ?>
以上例程会输出:
bool(false) bool(true)
Example #2 过程化风格
<?php $s = cairo_image_surface_create(CAIRO_SURFACE_TYPE_IMAGE, 100, 100); $c = cairo_create($s); var_dump(cairo_has_current_point($c)); cairo_move_to($c, 10, 10); var_dump(cairo_has_current_point($c)); ?>
以上例程会输出:
bool(false) bool(true)
参见
- CairoContext::getCurrentPoint() The getCurrentPoint purpose