paper.js/test/tests/Point.js

/*
 * Paper.js - The Swiss Army Knife of Vector Graphics Scripting.
 * http://paperjs.org/
 *
 * Copyright (c) 2011 - 2014, Juerg Lehni & Jonathan Puckey
 * http://scratchdisk.com/ & http://jonathanpuckey.com/
 *
 * Distributed under the MIT license. See LICENSE file for details.
 *
 * All rights reserved.
 */

module('Point');
test('new Point(10, 20)', function() {
    var point = new Point(10, 20);
    equals(point.x, 10, 'point.x');
    equals(point.y, 20, 'point.y');
});

test('new Point([10, 20])', function() {
    var point = new Point([10, 20]);
    equals(point.x, 10, 'point.x');
    equals(point.y, 20, 'point.y');
});

test('new Point({x: 10, y: 20})', function() {
    var point = new Point({ x: 10, y: 20 });
    equals(point.x, 10, 'point.x');
    equals(point.y, 20, 'point.y');
});

test('new Point(new Size(10, 20))', function() {
    var point = new Point(new Size(10, 20));
    equals(point, new Point(10, 20));
});

test('new Point({ width: 10, height: 20})', function() {
    var point = new Point({width: 10, height: 20});
    equals(point, new Point(10, 20));
});

test('new Point({ angle: 45, length: 20})', function() {
    var point = new Point({ angle: 40, length: 20 });
    equals(point, new Point(15.32089, 12.85575));
});

module('Point vector operations');

test('normalize(length)', function() {
    var point = new Point(0, 10).normalize(20);
    equals(point, new Point(0, 20));
});

test('set length', function() {
    var point = new Point(0, 10);
    point.length = 20;
    equals(point, new Point(0, 20));
});

test('get angle', function() {
    var angle = new Point(0, 10).angle;
    equals(angle, 90);
});

test('getAngle(point)', function() {
    var angle = new Point(0, 10).getAngle([10, 10]);
    equals(Math.round(angle), 45);
});

test('rotate(degrees)', function() {
    var point = new Point(100, 50).rotate(90);
    equals(point, new Point(-50, 100));
});

test('set angle', function() {
    var point = new Point(10, 20);
    point.angle = 92;
    equals(point.angle, 92);
    equals(point, new Point({
        angle: 92,
        length: Math.sqrt(10 * 10 + 20 * 20)
    }));
});

test('set angle & length', function() {
    var point1 = new Point();
    point1.length = Math.sqrt(2);
    point1.angle = -45;

    var point2 = new Point();
    point2.angle = -45;
    point2.length = Math.sqrt(2);

    equals(point2, point1);
});

test('getting angle after x / y change', function() {
    var vector = new Point(1, 0);
    equals(vector.angle, 0, 'angle before x / y change');
    vector.x = 0;
    vector.y = 1;
    equals(vector.angle, 90, 'angle after x / y change');
});

test('getDirectedAngle(point)', function() {
    equals(function() {
        return new Point(10, 10).getDirectedAngle(new Point(1, 0));
    }, -45);

    equals(function() {
        return new Point(-10, 10).getDirectedAngle(new Point(1, 0));
    }, -135);

    equals(function() {
        return new Point(-10, -10).getDirectedAngle(new Point(1, 0));
    }, 135);

    equals(function() {
        return new Point(10, -10).getDirectedAngle(new Point(1, 0));
    }, 45);
});

test('equals()', function() {
    equals(function() {
        return new Point(10, 10).equals([10, 10]);
    }, true);

    equals(function() {
        return new Point(0, 0).equals({});
    }, false);

    equals(function() {
        return new Point(0, 0).equals(null);
    }, false);
});

test('isCollinear()', function() {
    equals(function() {
        return new Point(10, 5).isCollinear(new Point(20, 10));
    }, true);
    equals(function() {
        return new Point(5, 10).isCollinear(new Point(-5, -10));
    }, true);
    equals(function() {
        return new Point(10, 10).isCollinear(new Point(20, 10));
    }, false);
    equals(function() {
        return new Point(10, 10).isCollinear(new Point(10, -10));
    }, false);
});

test('isOrthogonal()', function() {
    equals(function() {
        return new Point(10, 5).isOrthogonal(new Point(5, -10));
    }, true);
    equals(function() {
        return new Point(5, 10).isOrthogonal(new Point(-10, 5));
    }, true);
    equals(function() {
        return new Point(10, 10).isOrthogonal(new Point(20, 20));
    }, false);
    equals(function() {
        return new Point(10, 10).isOrthogonal(new Point(10, -20));
    }, false);
});