CairoContext::arcCairoContext::arcNegative
cairo_arc_negative
(PECL cairo >= 0.1.0)
CairoContext::arcNegative -- cairo_arc_negative — Adds a negative arc
Opis
Styl obiektowy (method):
$x
, float $y
, float $radius
, float $angle1
, float $angle2
)Styl proceduralny:
$context
, float $x
, float $y
, float $radius
, float $angle1
, float $angle2
)
Adds a circular arc of the given radius to the current path.
The arc is centered at (x, y), begins at
angle1 and proceeds in the direction of decreasing angles to end at
angle2. If angle2 is greater than
angle1 it will be progressively decreased by 2*M_PI until it is less than
angle1.
See CairoContext::arc() or cairo_arc() for more details.
This function differs only in the direction of the arc between the two angles.
Parametry
-
context -
A valid CairoContext object
-
x -
double x position
-
y -
double y position
-
radius -
The radius of the desired negative arc
-
angle1 -
Start angle of the arc
-
angle2 -
End angle of the arc
Zwracane wartości
Nie jest zwracana żadna wartość.
Przykłady
Przykład #1 Styl obiektowy
<?php
$s = new CairoImageSurface(CairoFormat::ARGB32, 100, 100);
$c = new CairoContext($s);
$c->setSourceRgb(0, 0, 0);
$c->paint();
$c->setLineWidth(1);
$c->setSourceRgb(1, 1, 1);
for ($r = 50; $r > 0; $r -= 10) {
$c->arcNegative(50, 50, $r, 2 * M_PI, 0);
$c->stroke();
$c->fill();
}
$s->writeToPng(dirname(__FILE__) . '/CairoContext__arcNegative.png');
?>
Przykład #2 Styl proceduralny
<?php
$s = cairo_image_surface_create(CAIRO_SURFACE_TYPE_IMAGE, 100, 100);
$c = cairo_create($s);
cairo_set_source_rgb($c, 0, 0, 0);
cairo_paint($c);
cairo_set_source_rgb($c, 1, 1, 1);
cairo_set_line_width($c, 1);
for ($r = 50; $r > 0; $r -= 10) {
cairo_arc_negative($c, 50, 50, $r, 2 * M_PI, 0);
cairo_stroke($c);
cairo_fill($c);
}
cairo_surface_write_to_png($s, dirname(__FILE__) . '/cairo_arc_negative.png');
?>
add a note
User Contributed Notes
CairoContext::arcNegative