/// <inheritdoc cref="NotuiElement"/>
public override IntersectionPoint PureHitTest(Touch touch, bool prevpos, out IntersectionPoint persistentIspoint)
{
touch.GetPreviousWorldPosition(Context, out var popos, out var pdir);
var sizetr = Matrix4x4.CreateScale(Size);
//var invsizetr = Matrix4x4.CreateScale(Vector3.One/Size);
var scldisp = sizetr * DisplayMatrix;
Matrix4x4.Invert(scldisp, out var invdispmat);
var trelpos = Vector3.Transform(prevpos ? popos : touch.WorldPosition, invdispmat);
var treldir = Vector3.TransformNormal(prevpos ? pdir : touch.ViewDir, invdispmat);
IntersectionPoint ispoint = null;
float d = float.MaxValue;
for (int i = 0; i < 6; i++)
{
var pmat = Matrix4x4.CreateWorld(_planeCenters[i] * -0.5f, _planeCenters[i], _planeUps[i]);
var hit = Intersections.PlaneRay(trelpos, treldir, pmat, out var aispos, out var pispos);
if (!hit)
{
continue;
}
hit = pispos.X <= 0.5 && pispos.X >= -0.5 &&
pispos.Y <= 0.5 && pispos.Y >= -0.5;
if (!hit)
{
continue;
}
var diff = aispos - trelpos;
if (Vector3.Dot(Vector3.Normalize(diff), treldir) < 0)
{
continue;
}
if (diff.Length() >= d)
{
continue;
}
var locmat = pmat * scldisp;
//TODO: create a more analitical method for scale correction, this is dumb
Matrix4x4.Decompose(locmat, out var locscl, out var qdummy, out var tdummy);
var invlocscl = Vector3.One / (locscl / DisplayTransformation.Scale);
var smat = Matrix4x4.CreateScale(invlocscl) * Matrix4x4.CreateTranslation(pispos) * locmat;
ispoint = new IntersectionPoint(Vector3.Transform(aispos, scldisp), aispos, pispos, smat, this, touch);
d = diff.Length();
}
persistentIspoint = ispoint;
return(ispoint);
}
/// <summary>
/// Get the planar velocity of a touch and its current and previous intersection-point in the selected plane's space
/// </summary>
/// <param name="touch"></param>
/// <param name="plane">Arbitrary matrix of the XY plane to do the intersection with</param>
/// <param name="context">Notui context to provide screen space/alignment information</param>
/// <param name="currpos">Current intersection point in the space of the plane</param>
/// <param name="prevpos">Previous intersection point in the space of the plane</param>
/// <returns>Velocity of the touch relative to the space of the plane</returns>
public static Vector3 GetPlanarVelocity(this TouchContainer touch, Matrix4x4 plane, NotuiContext context, out Vector3 currpos, out Vector3 prevpos)
{
// get planar coords for current touch position
var hit = Intersections.PlaneRay(touch.WorldPosition, touch.ViewDir, plane, out var capos, out var crpos);
currpos = crpos;
// get planar coords for the previous touch position
touch.GetPreviousWorldPosition(context, out var popos, out var pdir);
var phit = Intersections.PlaneRay(popos, pdir, plane, out var papos, out var prpos);
prevpos = prpos;
return(crpos - prpos);
}
/// <summary>
/// General Hittesting on the infinite plane defined by the element transforms
/// </summary>
/// <param name="touch">The touch to be tested</param>
/// <param name="prevpos">Calculate Intersection point for previous position</param>
/// <returns>If the touch hits then an Intersection point otherwise null</returns>
public IntersectionPoint PreparePlanarShapeHitTest(Touch touch, bool prevpos)
{
// when first hit consider the display transformation then
// for the rest of the interaction consider the interaction transform
touch.GetPreviousWorldPosition(Context, out var popos, out var pdir);
var hit = Intersections.PlaneRay(
prevpos ? popos : touch.WorldPosition,
prevpos ? pdir : touch.ViewDir,
DisplayMatrix,
out var ispoint,
out var planarpoint);
return(hit ? new IntersectionPoint(ispoint, planarpoint, this, touch)
{
SurfaceSpace = planarpoint * 2
} : null);
}
