geom-collision

#### Geometry Collision Detection


This library has some useful collision detection methods.

``js
var collision = require("geom-collision");
`

$3

`js
var output = collision.lineLine(
{x: 0, y: -2}, // Line 1 start
{x: 0, y: 2}, // Line 1 stop
{x: -2, y: 0}, // Line 2 start
{x: 2, y: 0} // Line 2 stop
);

// output.result == collision.INTERSECT == "intersect";
// output.x == 0;
// output.y == 0;
`

$3

`js
var output = collision.lineCircle(
{x: 3, y: -4},
{x: 3, y: 4},
{x: 0, y: 0},
4
);

// output.result == collision.INTERSECT == "intersect";
// output.entry.x == 3;
// output.entry.y == 2.6457513110645907;
// output.exit.x == 3;
// output.exit.y == -2.6457513110645907;
`

$3

`js
var output = collision.pointRectangleSimple(
{x: 0, y: 0},
{x: 0, y: 0},
{x: 1, y: 2}
);

// output.result == collision.INSIDE == "inside";
`

$3

`js
var output = collision.rectangleCircleSimple(
{x: -1, y: -1},
{x: 1, y: 1},
{x:.2, y: 0},
1.1
);

output.result.should.equal(collision.INTERSECT);
output.intersections.length.should.equal(6);
output.intersections[0].x.should.equal(0.6582575694955841);
output.intersections[0].y.should.equal(1);
output.intersections[1].x.should.equal(-0.2582575694955842);
output.intersections[1].y.should.equal(1);
output.intersections[2].x.should.equal(1);
output.intersections[2].y.should.equal(0.754983443527075);
output.intersections[3].x.should.equal(1);
output.intersections[3].y.should.equal(-0.754983443527075);
output.intersections[4].x.should.equal(0.6582575694955841);
output.intersections[4].y.should.equal(-1);
output.intersections[5].x.should.equal(-0.2582575694955842);
output.intersections[5].y.should.equal(-1);
`

$3

`js
var output = collision.rectangleRectangleSimple(
{x: 2, y: 1},
{x: 0, y: 0},
{x: 1, y: 2},
{x: 0, y: 0}
);

// output.result == collision.INTERSECT == "intersect";
``

$3

* INTERSECT: "intersect"
* INSIDE: "inside"
* OUTSIDE: "outside"
* COINCIDE: "coincide"
* PARALLEL: "parallel"
* TANGENT: "tangent"