public RopeTester()
{
const float Length = 36;
const float Damping = 0.95f;
const float Gravity = 20;
vec2[] points = new vec2[18];
for (int i = 0; i < points.Length; i++)
{
points[i] = new vec2(60, 120) + new vec2(Length * i * 1.25f, 0);
}
rope = new VerletRope2D(points, Length, Damping, Gravity);
MessageSystem.Subscribe(this, CoreMessageTypes.Mouse, (messageType, data, dt) =>
{
var mouse = (MouseData)data;
if (mouse.Query(GLFW_MOUSE_BUTTON_LEFT, InputStates.PressedThisFrame))
{
var array = rope.Points;
var index = new Random().Next(array.Length - 2) + 1;
array[index].Position += new vec2(0, 20);
}
});
}
public override void Initialize(Scene scene, JToken data)
{
// TODO: Pull dimensions from the model.
const float Width = 2.5f;
const float Height = 0.35f;
const float Depth = 11.37f;
var p1 = Utilities.ParseVec3(data["P1"].Value <string>());
var p2 = Utilities.ParseVec3(data["P2"].Value <string>());
var count = data["SegmentCount"].Value <int>();
var length = data["SegmentLength"].Value <float>();
Debug.Assert(count > 0, "Segment count must be positive.");
Debug.Assert(length > 0, "Segment length must be positive..");
var points = new vec2[count + 1];
// This value effectively stretches points beyond their target length, which results in a stiffer bridge.
float scale = Utilities.Distance(p2, p1) / count / length;
float yIncrement = (p2.y - p1.y) / count;
for (int i = 0; i < points.Length; i++)
{
points[i] = new vec2(length * i * scale, -yIncrement * i);
}
position = p1;
rope = new VerletRope2D(points, length, Damping, PhysicsConstants.Gravity);
var angle = Utilities.Angle(p1.swizzle.xz, p2.swizzle.xz);
flatOrientation = quat.FromAxisAngle(angle, vec3.UnitY);
// Since rope endpoints are fixed, planks are only created for non-endpoints.
bodies = new RigidBody[count - 1];
models = new Model[bodies.Length];
var world = scene.World;
var shape = new BoxShape(Width, Height, Depth);
shape.Tag = new Rectangle(Width, Depth);
for (int i = 0; i < bodies.Length; i++)
{
bodies[i] = CreateBody(scene, shape, RigidBodyTypes.PseudoStatic, RigidBodyFlags.None, false, false);
var model = CreateModel(scene, "Cube.obj", false);
model.Scale = new vec3(Width, Height, Depth);
models[i] = model;
}
// Since rope bridges don't have a controlling body, the pre-step callback must be attached to the world
// instead.
world.Events.PreStep += PreStep;
base.Initialize(scene, data);
}
