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CairoContext::arcNegative


(PECL cairo >= 0.1.0)

CairoContext::arcNegative -- cairo_arc_negativeAdds a negative arc

Beschreibung

Object oriented style (method):

public void CairoContext::arcNegative ( float $x , float $y , float $radius , float $angle1 , float $angle2 )

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.

Parameter-Liste

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

Rückgabewerte

Es wird kein Wert zurückgegeben.

Beispiele

PHP Code
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// Creates the CairoSurface $surface = new CairoImageSurface(CairoFormat::ARGB32, 50, 50); // Get the cairo context $context = new CairoContext($surface); // Appends the arc $context->arcNegative(0, 0, 1, 0, 2 * M_PI);

PHP Code
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// Creates the CairoSurface $surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 50, 50); // Get the cairo context $context = cairo_create($surface); // Appends the arc cairo_arc_negative($context, 0, 0, 1, 0, 2 * M_PI);

Siehe auch