/// <summary>
/// We apply a rotation angle equivalent to the projection of the mouse translation to the screen transformation direction.
/// </summary>
/// <returns></returns>
protected override InitialTransformation CalculateTransformation()
{
var mouseDrag = Input.MousePosition - StartMousePosition;
var transformation = new InitialTransformation {
Rotation = Quaternion.Identity, Scale = Vector3.One
};
// determine the rotation angle
var rotationAngle = Vector2.Dot(new Vector2(mouseDrag.X, -mouseDrag.Y), TransformationDirection) * 2.1f * MathUtil.Pi; // half screen size if little bit more Pi
// snap the rotation angle if necessary
if (UseSnap)
{
var snapValue = MathUtil.DegreesToRadians(SnapValue);
rotationAngle = MathUtil.Snap(rotationAngle, snapValue);
}
// determine the rotation axis in the Gizmo
var rotationAxisGizmo = Vector3.Zero;
for (int i = 0; i < 3; i++)
{
if ((TransformationAxes & ((GizmoTransformationAxes)(1 << i))) != 0)
{
rotationAxisGizmo[i] = 1;
}
}
rotationAxisGizmo.Normalize();
// set the rotation to apply in the gizmo space
transformation.Rotation = Quaternion.RotationAxis(rotationAxisGizmo, rotationAngle);
return(transformation);
}
/// <summary>
/// We apply a rotation angle equivalent to the projection of the mouse translation to the screen transformation direction.
/// </summary>
/// <returns></returns>
protected override InitialTransformation CalculateTransformation()
{
var transformation = new InitialTransformation { Rotation = Quaternion.Identity, Scale = Vector3.One };
// set the rotation to apply in the gizmo space
transformation.Rotation = SceneEditorSettings.UseLinearMovementForRotation.GetValue() ? GetRotationFromLinearMovement() : GetRotationFromCircularMovement();
return transformation;
}
protected virtual void OnTransformationStarted(Vector2 mouseDragPixel)
{
transformationStarted = true;
// keep in memory all initial transformation states
InitialTransformations.Clear();
foreach (var entity in ModifiedEntities)
{
// Ensure world matrix is computed
entity.Transform.UpdateWorldMatrix();
InitialTransformations[entity] = new InitialTransformation
{
Scale = entity.Transform.Scale,
Translation = entity.Transform.Position,
Rotation = entity.Transform.Rotation,
InverseParentMatrix = entity.Transform.Parent != null?Matrix.Invert(entity.Transform.Parent.WorldMatrix) : Matrix.Identity
};
}
}
