public void ConstraintProperties()
{
var anchorA = new Vect(1, 1);
var anchorB = new Vect(0.5, 0.5);
var constraint = new PinJoint(bodyA, bodyB, anchorA, anchorB);
Assert.IsNull(constraint.Space, "#1");
space.AddConstraint(constraint);
Assert.AreSame(space, constraint.Space, "#1.2");
Assert.AreSame(bodyA, constraint.BodyA, "#2");
Assert.AreSame(bodyB, constraint.BodyB, "#3");
Assert.AreEqual(anchorA, constraint.AnchorA, "#2.1");
Assert.AreEqual(anchorB, constraint.AnchorB, "#3.1");
constraint.MaxForce = 1.2;
Assert.AreEqual(1.2, constraint.MaxForce, "#4");
constraint.ErrorBias = 10.0;
Assert.AreEqual(10.0, constraint.ErrorBias, "#5");
constraint.CollideBodies = false;
Assert.IsFalse(constraint.CollideBodies, "#6");
constraint.CollideBodies = true;
Assert.IsTrue(constraint.CollideBodies, "#7");
var sb = new StringBuilder();
constraint.PreSolve = (c, s) => sb.Append("PreSolve");
constraint.PostSolve = (c, s) => sb.Append("PostSolve");
space.Step(0.2);
constraint.PreSolve = null;
constraint.PostSolve = null;
space.Step(0.2);
string solve = sb.ToString();
Assert.AreEqual("PreSolvePostSolve", solve, "#8");
}
private void MouseLeftButtonDown(Vector2 position)
{
Vect mousePosition = MouseToSpace(position);
// give the mouse click a little radius to make it easier to click small shapes.
double radius = 5.0;
PointQueryInfo info = space.PointQueryNearest(mousePosition, radius, GrabbableFilter);
if (info == null)
{
return;
}
Shape shape = info.Shape;
Body body = shape.Body;
double mass = body.Mass;
if (double.IsInfinity(mass))
{
return;
}
// Use the closest point on the surface if the click is outside of the shape.
Vect nearest = info.Distance > 0.0 ? info.Point : mousePosition;
cursorJoint = new PivotJoint(cursorBody, body, Vect.Zero, body.WorldToLocal(nearest));
cursorJoint.MaxForce = 5000.0;
cursorJoint.ErrorBias = Math.Pow(1.0 - 0.15, 60.0);
space.AddConstraint(cursorJoint);
demo[currentDemo].OnMouseLeftButtonDown(chipmunkDemoMouse);
}