public Spider(World world, PhysicsGameScreen screen, Vector2 position)
{
//Load bodies
_circle = BodyFactory.CreateCircle(world, SpiderBodyRadius, 0.1f, position);
_circle.BodyType = BodyType.Dynamic;
//Left upper leg
_leftUpper = BodyFactory.CreateRectangle(world, _upperLegSize.X, _upperLegSize.Y, 0.1f,
_circle.Position - new Vector2(SpiderBodyRadius, 0f) -
new Vector2(_upperLegSize.X / 2f, 0f));
_leftUpper.BodyType = BodyType.Dynamic;
//Left lower leg
_leftLower = BodyFactory.CreateRectangle(world, _lowerLegSize.X, _lowerLegSize.Y, 0.1f,
_circle.Position - new Vector2(SpiderBodyRadius, 0f) -
new Vector2(_upperLegSize.X, 0f) -
new Vector2(_lowerLegSize.X / 2f, 0f));
_leftLower.BodyType = BodyType.Dynamic;
//Right upper leg
_rightUpper = BodyFactory.CreateRectangle(world, _upperLegSize.X, _upperLegSize.Y, 0.1f,
_circle.Position + new Vector2(SpiderBodyRadius, 0f) +
new Vector2(_upperLegSize.X / 2f, 0f));
_rightUpper.BodyType = BodyType.Dynamic;
//Right lower leg
_rightLower = BodyFactory.CreateRectangle(world, _lowerLegSize.X, _lowerLegSize.Y, 0.1f,
_circle.Position + new Vector2(SpiderBodyRadius, 0f) +
new Vector2(_upperLegSize.X, 0f) +
new Vector2(_lowerLegSize.X / 2f, 0f));
_rightLower.BodyType = BodyType.Dynamic;
//Create joints
JointFactory.CreateRevoluteJoint(world, _circle, _leftUpper, new Vector2(_upperLegSize.X / 2f, 0f));
_leftShoulderAngleJoint = JointFactory.CreateAngleJoint(world, _circle, _leftUpper);
_leftShoulderAngleJoint.MaxImpulse = 3f;
JointFactory.CreateRevoluteJoint(world, _circle, _rightUpper, new Vector2(-_upperLegSize.X / 2f, 0f));
_rightShoulderAngleJoint = JointFactory.CreateAngleJoint(world, _circle, _rightUpper);
_rightShoulderAngleJoint.MaxImpulse = 3f;
JointFactory.CreateRevoluteJoint(world, _leftUpper, _leftLower, new Vector2(_lowerLegSize.X / 2f, 0f));
_leftKneeAngleJoint = JointFactory.CreateAngleJoint(world, _leftUpper, _leftLower);
_leftKneeAngleJoint.MaxImpulse = 3f;
JointFactory.CreateRevoluteJoint(world, _rightUpper, _rightLower, new Vector2(-_lowerLegSize.X / 2f, 0f));
_rightKneeAngleJoint = JointFactory.CreateAngleJoint(world, _rightUpper, _rightLower);
_rightKneeAngleJoint.MaxImpulse = 3;
_screen = screen;
//GFX
AssetCreator creator = _screen.ScreenManager.Assets;
_torso = new Sprite(creator.CircleTexture(SpiderBodyRadius, MaterialType.Waves, Color.Gray, 1f));
_upperLeg = new Sprite(creator.TextureFromShape(_leftUpper.FixtureList[0].Shape,
MaterialType.Blank, Color.DimGray, 1f));
_lowerLeg = new Sprite(creator.TextureFromShape(_leftLower.FixtureList[0].Shape,
MaterialType.Blank, Color.DarkSlateGray, 1f));
}
private void CreateChassis(World world, Vector2 pivot, AssetCreator assets)
{
{
PolygonShape shape = new PolygonShape(1f);
shape.Vertices = PolygonTools.CreateRectangle(5f / 2f, 2.0f / 2f);
_body = new Sprite(assets.TextureFromShape(shape, MaterialType.Blank, Color.Beige, 1f));
_chassis = world.CreateBody();
_chassis.BodyType = BodyType.Dynamic;
_chassis.Position = pivot + _position;
Fixture fixture = _chassis.CreateFixture(shape);
fixture.CollisionGroup = -1;
}
{
CircleShape shape = new CircleShape(1.6f, 1f);
_engine = new Sprite(assets.TextureFromShape(shape, MaterialType.Waves, Color.Beige * 0.8f, 1f));
_wheel = world.CreateBody();
_wheel.BodyType = BodyType.Dynamic;
_wheel.Position = pivot + _position;
Fixture fixture = _wheel.CreateFixture(shape);
fixture.CollisionGroup = -1;
}
{
_motorJoint = new RevoluteJoint(_wheel, _chassis, _wheel.GetLocalPoint(_chassis.Position), Vector2.Zero);
_motorJoint.CollideConnected = false;
_motorJoint.MotorSpeed = _motorSpeed;
_motorJoint.MaxMotorTorque = 400f;
_motorJoint.MotorEnabled = true;
world.Add(_motorJoint);
}
}
private void CreateGFX(AssetCreator assets)
{
// create sprite based on body
_circleSprite = new Sprite(assets.TextureFromShape(_ball.FixtureList[0].Shape, MaterialType.Waves, Color.Brown, 1f));
}