source: other-projects/playing-in-the-street/summer-2013/trunk/Playing-in-the-Street-WPF/Content/Web/mrdoob-three.js-4862f5f/test/unit/math/Vector2.js@ 28897

/**
 * @author bhouston / http://exocortex.com
 */

module( "Vector2" );

test( "constructor", function() {
    var a = new THREE.Vector2();
    ok( a.x == 0, "Passed!" );
    ok( a.y == 0, "Passed!" );

    a = new THREE.Vector2( x, y );
    ok( a.x === x, "Passed!" );
    ok( a.y === y, "Passed!" );
});

test( "copy", function() {
    var a = new THREE.Vector2( x, y );
    var b = new THREE.Vector2().copy( a );
    ok( b.x == x, "Passed!" );
    ok( b.y == y, "Passed!" );

    // ensure that it is a true copy
    a.x = 0;
    a.y = -1;
    ok( b.x == x, "Passed!" );
    ok( b.y == y, "Passed!" );
});

test( "set", function() {
    var a = new THREE.Vector2();
    ok( a.x == 0, "Passed!" );
    ok( a.y == 0, "Passed!" );

    a.set( x, y );
    ok( a.x == x, "Passed!" );
    ok( a.y == y, "Passed!" );
});

test( "setX,setY", function() {
    var a = new THREE.Vector2();
    ok( a.x == 0, "Passed!" );
    ok( a.y == 0, "Passed!" );

    a.setX( x );
    a.setY( y );
    ok( a.x == x, "Passed!" );
    ok( a.y == y, "Passed!" );
});

test( "setComponent,getComponent", function() {
    var a = new THREE.Vector2();
    ok( a.x == 0, "Passed!" );
    ok( a.y == 0, "Passed!" );

    a.setComponent( 0, 1 );
    a.setComponent( 1, 2 );
    ok( a.getComponent( 0 ) == 1, "Passed!" );
    ok( a.getComponent( 1 ) == 2, "Passed!" );
});

test( "add", function() {
    var a = new THREE.Vector2( x, y );
    var b = new THREE.Vector2( -x, -y );

    a.add( b );
    ok( a.x == 0, "Passed!" );
    ok( a.y == 0, "Passed!" );

    var c = new THREE.Vector2().addVectors( b, b );
    ok( c.x == -2*x, "Passed!" );
    ok( c.y == -2*y, "Passed!" );
});

test( "sub", function() {
    var a = new THREE.Vector2( x, y );
    var b = new THREE.Vector2( -x, -y );

    a.sub( b );
    ok( a.x == 2*x, "Passed!" );
    ok( a.y == 2*y, "Passed!" );

    var c = new THREE.Vector2().subVectors( a, a );
    ok( c.x == 0, "Passed!" );
    ok( c.y == 0, "Passed!" );
});

test( "multiply/divide", function() {
    var a = new THREE.Vector2( x, y );
    var b = new THREE.Vector2( -x, -y );

    a.multiplyScalar( -2 );
    ok( a.x == x*-2, "Passed!" );
    ok( a.y == y*-2, "Passed!" );

    b.multiplyScalar( -2 );
    ok( b.x == 2*x, "Passed!" );
    ok( b.y == 2*y, "Passed!" );

    a.divideScalar( -2 );
    ok( a.x == x, "Passed!" );
    ok( a.y == y, "Passed!" );

    b.divideScalar( -2 );
    ok( b.x == -x, "Passed!" );
    ok( b.y == -y, "Passed!" );
});


test( "min/max/clamp", function() {
    var a = new THREE.Vector2( x, y );
    var b = new THREE.Vector2( -x, -y );
    var c = new THREE.Vector2();

    c.copy( a ).min( b );
    ok( c.x == -x, "Passed!" );
    ok( c.y == -y, "Passed!" );

    c.copy( a ).max( b );
    ok( c.x == x, "Passed!" );
    ok( c.y == y, "Passed!" );

    c.set( -2*x, 2*y );
    c.clamp( b, a );
    ok( c.x == -x, "Passed!" );
    ok( c.y == y, "Passed!" );
});

test( "negate", function() {
    var a = new THREE.Vector2( x, y );

    a.negate();
    ok( a.x == -x, "Passed!" );
    ok( a.y == -y, "Passed!" );
});

test( "dot", function() {
    var a = new THREE.Vector2( x, y );
    var b = new THREE.Vector2( -x, -y );
    var c = new THREE.Vector2();

    var result = a.dot( b );
    ok( result == (-x*x-y*y), "Passed!" );

    result = a.dot( c );
    ok( result == 0, "Passed!" );
});

test( "length/lengthSq", function() {
    var a = new THREE.Vector2( x, 0 );
    var b = new THREE.Vector2( 0, -y );
    var c = new THREE.Vector2();

    ok( a.length() == x, "Passed!" );
    ok( a.lengthSq() == x*x, "Passed!" );
    ok( b.length() == y, "Passed!" );
    ok( b.lengthSq() == y*y, "Passed!" );
    ok( c.length() == 0, "Passed!" );
    ok( c.lengthSq() == 0, "Passed!" );

    a.set( x, y );
    ok( a.length() == Math.sqrt( x*x + y*y ), "Passed!" );
    ok( a.lengthSq() == ( x*x + y*y ), "Passed!" );
});

test( "normalize", function() {
    var a = new THREE.Vector2( x, 0 );
    var b = new THREE.Vector2( 0, -y );
    var c = new THREE.Vector2();

    a.normalize();
    ok( a.length() == 1, "Passed!" );
    ok( a.x == 1, "Passed!" );

    b.normalize();
    ok( b.length() == 1, "Passed!" );
    ok( b.y == -1, "Passed!" );
});

test( "distanceTo/distanceToSquared", function() {
    var a = new THREE.Vector2( x, 0 );
    var b = new THREE.Vector2( 0, -y );
    var c = new THREE.Vector2();

    ok( a.distanceTo( c ) == x, "Passed!" );
    ok( a.distanceToSquared( c ) == x*x, "Passed!" );

    ok( b.distanceTo( c ) == y, "Passed!" );
    ok( b.distanceToSquared( c ) == y*y, "Passed!" );
});

test( "setLength", function() {
    var a = new THREE.Vector2( x, 0 );

    ok( a.length() == x, "Passed!" );
    a.setLength( y );
    ok( a.length() == y, "Passed!" );

    a = new THREE.Vector2( 0, 0 );
    ok( a.length() == 0, "Passed!" );
    a.setLength( y );
    ok( a.length() == 0, "Passed!" );
});

test( "lerp/clone", function() {
    var a = new THREE.Vector2( x, 0 );
    var b = new THREE.Vector2( 0, -y );

    ok( a.lerp( a, 0 ).equals( a.lerp( a, 0.5 ) ), "Passed!" );
    ok( a.lerp( a, 0 ).equals( a.lerp( a, 1 ) ), "Passed!" );

    ok( a.clone().lerp( b, 0 ).equals( a ), "Passed!" );

    ok( a.clone().lerp( b, 0.5 ).x == x*0.5, "Passed!" );
    ok( a.clone().lerp( b, 0.5 ).y == -y*0.5, "Passed!" );

    ok( a.clone().lerp( b, 1 ).equals( b ), "Passed!" );
});

test( "equals", function() {
    var a = new THREE.Vector2( x, 0 );
    var b = new THREE.Vector2( 0, -y );

    ok( a.x != b.x, "Passed!" );
    ok( a.y != b.y, "Passed!" );

    ok( ! a.equals( b ), "Passed!" );
    ok( ! b.equals( a ), "Passed!" );

    a.copy( b );
    ok( a.x == b.x, "Passed!" );
    ok( a.y == b.y, "Passed!" );

    ok( a.equals( b ), "Passed!" );
    ok( b.equals( a ), "Passed!" );
});