/// <summary>
/// Perform any multi-touch actions
/// </summary>
public void Update()
{
if (this.AttachedCursors.Count > 0)
{
// Find the Behavior for the multitouch action
var behaviorChain = this.Behavior;
if (behaviorChain == null)
{
//default to full multitouch
behaviorChain = Behaviors.FullMultitouchNode.PrincipalBehavior;
}
// Setup the arguments to perform the Behavior
var performArguments = new Behaviors.PerformArguments
{
Cursors = this.AttachedCursors
};
// If we have constraints, add the settings to the performArguments
if (this.Constraint != null)
{
var checkConstraintArguments = new Constraints.CheckConstraintArguments
{
Slide = this
};
performArguments.ValidateFunction = (Behaviors.ValidateFunctionArguments validateFunctionArguments) =>
{
return(this.Constraint.CheckConstraint(validateFunctionArguments, checkConstraintArguments));
};
}
// Perform the behavior chain (inside the chain it checks relevant Constraints and at
// each point in the tree uses fallback behavior if Constraints are not met if any)
{
Matrix4x4 newTransform = this.Transform; // this will always be overwritten - it's just the cheapest thing here to use as a dummy
if (behaviorChain.PerformAndValidate(performArguments, this.Transform, ref newTransform))
{
this.Transform = newTransform;
}
else
{
// No matching of behaviors and constraints could be met
}
}
}
}
public bool CheckConstraint(Behaviors.ValidateFunctionArguments validateFunctionArguments, CheckConstraintArguments checkConstraintArguments)
{
if (this.UpstreamConstraint != null)
{
if (!this.UpstreamConstraint.CheckConstraint(validateFunctionArguments, checkConstraintArguments))
{
return(false);
}
}
if (this.HitTestFunction != null)
{
var localCoordinates = new List <Vector2D>();
var worldCoordinates = new List <Vector2D>();
// Build local coordinates
for (int i = 0; i < this.Resolution; i++)
{
for (int j = 0; j < this.Resolution; j++)
{
localCoordinates.Add(new Vector2D(
((double)i / (double)(Resolution - 1)) - 0.5,
((double)j / (double)(Resolution - 1)) - 0.5
));
}
}
// Build world coordinates
foreach (var localCoordinate in localCoordinates)
{
// Ignore local coordinate which doesn't pass slide hit test
if (checkConstraintArguments.Slide.DragHitTest(localCoordinate))
{
var localCoordinate3 = new Vector3D(localCoordinate);
var worldCoordinate3 = validateFunctionArguments.Transform * localCoordinate3;
var worldCoordinate = new Vector2D(worldCoordinate3.x, worldCoordinate3.y);
worldCoordinates.Add(worldCoordinate);
}
}
// Check if any world coordinates fail hit test
foreach (var worldCoordinate in worldCoordinates)
{
var worldCoordinateInHitTest = worldCoordinate;
if (this.HitTestFunction is HitTestImageFileNode.Function)
{
worldCoordinateInHitTest /= 2.0;
}
if (!this.HitTestFunction.TestHit(worldCoordinateInHitTest)) // Full screen hit test rather than default quad size
{
return(false);
}
}
}
return(true);
}
public bool CheckConstraint(Behaviors.ValidateFunctionArguments validateFunctionArguments, CheckConstraintArguments checkConstraintArguments)
{
if (this.UpstreamConstraint != null)
{
if (!this.UpstreamConstraint.CheckConstraint(validateFunctionArguments, checkConstraintArguments))
{
return(false);
}
}
if (!validateFunctionArguments.ActionsApplied.Contains(Behaviors.ActionsApplied.Translate))
{
// Ignore if no translate applied
return(true);
}
Vector3D rotation, scale, translation;
Matrix4x4Utils.Decompose(validateFunctionArguments.Transform
, out scale
, out rotation
, out translation);
var translation2 = new Vector2D(translation.x, translation.y);
var result = translation2.x >= this.Minimum.x &&
translation2.y >= this.Minimum.y &&
translation2.x <= this.Maximum.x &&
translation2.y <= this.Maximum.y;
return(result);
}
public bool CheckConstraint(Behaviors.ValidateFunctionArguments validateFunctionArguments, CheckConstraintArguments checkConstraintArguments)
{
if (this.UpstreamConstraint != null)
{
if (!this.UpstreamConstraint.CheckConstraint(validateFunctionArguments, checkConstraintArguments))
{
return(false);
}
}
if (!validateFunctionArguments.ActionsApplied.Contains(Behaviors.ActionsApplied.Rotate))
{
// Ignore if no rotation applied
return(true);
}
Vector3D rotation, scale, translation;
Matrix4x4Utils.Decompose(validateFunctionArguments.Transform
, out scale
, out rotation
, out translation);
return(rotation.z / (Math.PI * 2.0) >= this.Minimum && rotation.z / (Math.PI * 2.0) <= this.Maximum);
}