(PECL cairo >= 0.1.0)
Adds a negative arc
public void CairoContext::arcNegative ( float $x, float $y, float $radius, float $angle1, float $angle2 )
Object oriented style (method):
Procedural style:
void cairo_arc_negative ( CairoContext
$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.
Parameters:
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
Returns:
No value is returned.
Examples:
Object oriented style
<?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'); ?>
Procedural style
<?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'); ?>
See also:
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