cannon/test/HingeConstraint.js

A lightweight 3D physics engine written in JavaScript.

var Vec3 = require('../src/math/Vec3');
var HingeConstraint = require('../src/constraints/HingeConstraint');
var Body = require('../src/objects/Body');

module.exports = {
    construct: function(test){
        var bodyA = new Body({ mass: 1, position: new Vec3(1, 0, 0) });
        var bodyB = new Body({ mass: 1, position: new Vec3(-1, 0, 0) });
        var c = new HingeConstraint(bodyA, bodyB, { maxForce: 123 });

        test.equal(c.equations.length, 6); // 5 actually, and 1 for the motor

        test.equal(c.equations[0].maxForce, 123);
        test.equal(c.equations[1].maxForce, 123);
        test.equal(c.equations[2].maxForce, 123);
        test.equal(c.equations[3].maxForce, 123);
        test.equal(c.equations[4].maxForce, 123);
        test.equal(c.equations[5].maxForce, 123);

        test.equal(c.equations[0].minForce, -123);
        test.equal(c.equations[1].minForce, -123);
        test.equal(c.equations[2].minForce, -123);
        test.equal(c.equations[3].minForce, -123);
        test.equal(c.equations[4].minForce, -123);
        test.equal(c.equations[5].minForce, -123);

        test.done();
    },

    update: function(test){
        var bodyA = new Body({ mass: 1, position: new Vec3(1, 0, 0) });
        var bodyB = new Body({ mass: 1, position: new Vec3(-1, 0, 0) });
        var c = new HingeConstraint(bodyA, bodyB, { maxForce: 123 });

        c.update();

        test.done();
    },

    enableDisableMotor: function(test){
        var bodyA = new Body({ mass: 1, position: new Vec3(1, 0, 0) });
        var bodyB = new Body({ mass: 1, position: new Vec3(-1, 0, 0) });
        var c = new HingeConstraint(bodyA, bodyB);

        c.enableMotor();

        test.ok(c.motorEquation.enabled);

        c.disableMotor();

        test.equal(c.motorEquation.enabled, false);

        test.done();
    },

    setMotorSpeed: function(test){
        var bodyA = new Body({ mass: 1, position: new Vec3(1, 0, 0) });
        var bodyB = new Body({ mass: 1, position: new Vec3(-1, 0, 0) });
        var c = new HingeConstraint(bodyA, bodyB);

        c.setMotorSpeed(5);
        test.equal(c.motorEquation.targetVelocity, 5);

        test.done();
    },

    setMotorMaxForce: function(test){
        var bodyA = new Body({ mass: 1, position: new Vec3(1, 0, 0) });
        var bodyB = new Body({ mass: 1, position: new Vec3(-1, 0, 0) });
        var c = new HingeConstraint(bodyA, bodyB);

        c.setMotorMaxForce(100);
        test.equal(c.motorEquation.maxForce, 100);

        test.done();
    }
};