public function testBoundingBox()
 {
     $bb1 = new WMBoundingBox();
     $bb1->addPoint(0, 0);
     $this->assertEquals("[(0.000000,0.000000)x(0.000000,0.000000)]", "{$bb1}");
     $bb1->addPoint(10, 0);
     $bb1->addPoint(-10, 0);
     $bb1->addPoint(10, 10);
     $bb1->addPoint(-10, -10);
     $this->assertEquals("[(-10.000000,-10.000000)x(10.000000,10.000000)]", "{$bb1}");
     $r = $bb1->getBoundingRectangle();
     $this->assertEquals("[(-10.000000,-10.000000)x(10.000000,10.000000)]", "{$r}");
 }