public function testMisc()
{
$p1 = new WMPoint(0, 0);
$p2 = new WMPoint(10, 0);
$p3 = new WMPoint(0, 10);
$this->assertEquals(50, getTriangleArea($p1, $p2, $p3));
$p1 = new WMPoint(6, 35);
$p2 = new WMPoint(15, 10);
$p3 = new WMPoint(50, 29);
$this->assertEquals(523, getTriangleArea($p1, $p2, $p3));
}
function simplify($epsilon = 1.0E-10)
{
$output = new WMSpine();
$output->addPoint($this->points[0][0]);
$maxStartIndex = count($this->points) - 2;
$skip = 0;
for ($n = 1; $n <= $maxStartIndex; $n++) {
// figure out the area of the triangle formed by this point, and the one before and after
$area = getTriangleArea($this->points[$n - 1][0], $this->points[$n][0], $this->points[$n + 1][0]);
if ($area > $epsilon) {
$output->addPoint($this->points[$n][0]);
} else {
// ignore n
$skip++;
}
}
wm_debug("Skipped {$skip} points of {$maxStartIndex}\n");
$output->addPoint($this->points[$maxStartIndex + 1][0]);
return $output;
}