public function testTranslatePolar()
{
$p1 = new WMPoint(20, 30);
$p2 = $p1->translatePolar(0, 20);
$this->assertInstanceOf("WMPoint", $p2, "translatePolar() returns itself for chaining");
$this->assertEquals($p1, $p2);
$this->assertTrue($p1->closeEnough(new WMPoint(20, 10)), "The new point is 20 units up");
$this->assertTrue($p2->closeEnough(new WMPoint(20, 10)), "The new point is 20 units up");
$p1 = new WMPoint(20, 30);
$p1->translatePolar(180, 20);
$this->assertTrue($p1->closeEnough(new WMPoint(20, 50)), "The new point is 20 units down");
$p1 = new WMPoint(20, 30);
$p1->translatePolar(90, 20);
$this->assertTrue($p1->closeEnough(new WMPoint(40, 30)), "The new point is 20 units right");
$p1 = new WMPoint(20, 30);
$p1->translatePolar(270, 20);
$this->assertTrue($p1->closeEnough(new WMPoint(0, 30)), "The new point is 20 units left");
$p1 = new WMPoint(20, 30);
$p1->translatePolar(135, 20);
$this->assertTrue($p1->closeEnough(new WMPoint(34.142135, 44.142135)));
$p1 = new WMPoint(20, 30);
$p1->translatePolar(45, 20);
$this->assertTrue($p1->closeEnough(new WMPoint(34.142135, 15.85786)));
}
