/**
* Draws a circular arc consisting of several minor steps on the bounding
* lines.
*
* @param ezcGraphCoordinate $center
* @param mixed $width
* @param mixed $height
* @param mixed $size
* @param mixed $startAngle
* @param mixed $endAngle
* @param ezcGraphColor $color
* @param bool $filled
* @return string Element id
*/
protected function simulateCircularArc(ezcGraphCoordinate $center, $width, $height, $size, $startAngle, $endAngle, ezcGraphColor $color, $filled)
{
for ($tmpAngle = min(ceil($startAngle / 180) * 180, $endAngle); $tmpAngle <= $endAngle; $tmpAngle = min(ceil($startAngle / 180 + 1) * 180, $endAngle)) {
$this->context->newPath();
$this->context->moveTo($center->x + cos(deg2rad($startAngle)) * $width / 2, $center->y + sin(deg2rad($startAngle)) * $height / 2);
// @TODO: Use cairo_curve_to()
for ($angle = $startAngle; $angle <= $tmpAngle; $angle = min($angle + $this->options->circleResolution, $tmpAngle)) {
$this->context->lineTo($center->x + cos(deg2rad($angle)) * $width / 2, $center->y + sin(deg2rad($angle)) * $height / 2 + $size);
if ($angle === $tmpAngle) {
break;
}
}
for ($angle = $tmpAngle; $angle >= $startAngle; $angle = max($angle - $this->options->circleResolution, $startAngle)) {
$this->context->lineTo($center->x + cos(deg2rad($angle)) * $width / 2, $center->y + sin(deg2rad($angle)) * $height / 2);
if ($angle === $startAngle) {
break;
}
}
$this->context->closePath();
$this->getStyle($color, $filled);
$this->context->stroke();
$startAngle = $tmpAngle;
if ($tmpAngle === $endAngle) {
break;
}
}
}
$width = 64; $height = 64; $sur = new CairoImageSurface(CairoFormat::ARGB32, $width, $height); $con = new CairoContext($sur); $con->newPath(); $con->arc($width / 2, $height / 2, $width / 3, 0, 2 * M_PI); $con->clip(); $con->newPath(); $con->moveTo(0, 0); $con->lineTo($width / 4, $height / 2); $con->lineTo(0, $height); $con->lineTo($width, $height); $con->lineTo(3 * $width / 4, $height / 2); $con->lineTo($width, 0); $con->closePath(); $con->clip(); $con->setSourceRgb(0, 0, 0.6); $con->newPath(); $con->moveTo(0, 0); $con->lineTo(0, $height); $con->lineTo($width / 2, 3 * $height / 4); $con->lineTo($width, $height); $con->lineTo($width, 0); $con->lineTo($width / 2, $height / 4); $con->closePath(); $con->fill(); $con->newPath(); $con->arc($width / 2, $height / 2, $width / 5, 0, 2 * M_PI); $con->clip(); $con->setSourceRgb(1, 1, 0);
