public function testPoint()
{
$p1 = new WMPoint(10, 13);
$p2 = new WMPoint(-40, 40);
$p3 = new WMPoint(30, 33);
$p4 = new WMPoint(10, 13);
$p5 = new WMPoint(10.001, 13.001);
$p6 = new WMPoint(10.1, 13.1);
$p8 = new WMPoint(-10, 13);
$this->assertTrue($p1->identical($p4));
$this->assertTrue($p4->identical($p1));
$this->assertFalse($p4->identical($p2));
$this->assertTrue($p1->closeEnough($p5));
$this->assertFalse($p1->closeEnough($p6));
$p5->round();
$this->assertTrue($p1->identical($p5));
$p7 = $p1->copy();
$this->assertTrue($p1->identical($p7));
$this->assertEquals(sqrt(800), $p1->distanceToPoint($p3));
$this->assertEquals(sqrt(800), $p3->distanceToPoint($p1));
$this->assertEquals(20, $p1->distanceToPoint($p8));
$this->assertEquals(20, $p8->distanceToPoint($p1));
$v1 = new WMVector(10, 40);
$v2 = $p1->vectorToPoint($p2);
$p = $p1->LERPWith($p3, 0.5);
$this->assertTrue($p->identical(new WMPoint(20, 23)));
$p = $p1->LERPWith($p3, -0.5);
$this->assertTrue($p->identical(new WMPoint(0, 3)));
$p = $p1->LERPWith($p3, 2.0);
$this->assertTrue($p->identical(new WMPoint(50, 53)));
$this->assertEquals("(10.000000,13.000000)", $p1->asString());
$this->assertEquals("(30.000000,33.000000)", $p3->asString());
$this->assertEquals("(10.000000,13.000000)", "{$p1}");
$this->assertEquals("(30.000000,33.000000)", "{$p3}");
$p->addVector($v1, 1.0);
$this->assertTrue($p->identical(new WMPoint(60, 93)));
$p->addVector($v1, -2.0);
$this->assertTrue($p->identical(new WMPoint(40, 13)));
$p->addVector($v1, 0);
$this->assertTrue($p->identical(new WMPoint(40, 13)));
$l = $p->lineToPoint($p1);
$this->assertEquals("/(40.000000,13.000000)-[-30.000000,0.000000]/", "{$l}");
}
/**
* Given a start point on the spine, calculate the points for an arrowhead.
*
* @param WMPoint $startPoint - a point back from the end of the spine
* @param WMPoint $endPoint - the actual end of the spine (the point of the arrow)
* @param int $linkWidth - the width of the link
* @param int $arrowWidth - the width of the arrowhead widest point
*
* @return WMPoint[]
*/
function generateArrowhead($startPoint, $endPoint, $linkWidth, $arrowWidth)
{
$points = array();
// Calculate a tangent
$arrowDirection = $startPoint->vectorToPoint($endPoint);
$arrowDirection->normalise();
// and from that, a normal
$arrowNormal = $arrowDirection->getNormal();
$points[] = $startPoint->copy()->addVector($arrowNormal, $linkWidth);
$points[] = $startPoint->copy()->addVector($arrowNormal, $arrowWidth);
$points[] = $endPoint;
$points[] = $startPoint->copy()->addVector($arrowNormal, -$arrowWidth);
$points[] = $startPoint->copy()->addVector($arrowNormal, -$linkWidth);
return $points;
}
