PHP CairoContext::strokePreserve示例

<?php

$sur = new CairoImageSurface(CairoFormat::ARGB32, 25 * 60, 4 * 60);
$con = new CairoContext($sur);
$dash = array(20.0, 20.0);
$con->setSourceRgb(0, 0, 0);
$con->paint();
for ($a = 0; $a < 4; $a++) {
    for ($b = 0; $b < 5; $b++) {
        for ($c = 0; $c < 5; $c++) {
            $con->moveTo(($b * 5 + $c) * 60 + 10, $a * 60 + 10);
            $con->relCurveTo(0, $b * 10, 0, $b * 10, $c * 10, $b * 10);
            $con->setSourceRgb(1, 1, 1);
            $con->setLineWidth(8);
            $con->setLineCap(CairoLineCap::ROUND);
            $con->setDash($dash, $a * 10);
            $con->strokePreserve();
            $con->setSourceRgb(0, 0.5, 1);
            $con->setLineWidth(2);
            $con->setLineCap(2);
            $ar = array(8.0, 8.0);
            $con->setDash($ar, 0);
            $con->stroke();
        }
    }
}
$sur->writeToPng(dirname(__FILE__) . '/dash-curve-php.png');