/// <summary>
/// Computes move vector, based on new position of mouse and view direction.
/// </summary>
/// <param name="newPosition">New mouse position</param>
/// <param name="viewDirection">view direction</param>
/// <returns>Offset vector wrt manipulator origin</returns>
public override Vector GetOffset(Point newPosition, Vector viewDirection)
{
Point hitPoint = Origin;
using (var ray = GetRayGeometry(newPosition, viewDirection))
{
if (hitPlane != null)
{
using (var testPlane = Plane.ByOriginXAxisYAxis(ManipulatorOrigin, hitPlane.XAxis, hitPlane.YAxis))
{
hitPoint = testPlane.Intersect(ray).FirstOrDefault() as Point;
}
}
else if (hitAxis != null)
{
using (var axisLine = RayExtensions.ToOriginCenteredLine(ManipulatorOrigin, hitAxis))
{
hitPoint = axisLine.ClosestPointTo(ray);
}
}
}
if (hitPoint == null)
{
return(Vector.ByCoordinates(0, 0, 0));
}
return(Vector.ByTwoPoints(ManipulatorOrigin, hitPoint));
}
/// <summary>
/// Draws axis line
/// </summary>
/// <param name="package"></param>
/// <param name="axis"></param>
/// <param name="name"></param>
private void DrawAxisLine(ref IRenderPackage package, Vector axis, string name)
{
package.Description = string.Format("{0}_{1}_{2}", RenderDescriptions.AxisLine, Name, name);
using (var line = RayExtensions.ToOriginCenteredLine(Origin, axis))
{
var color = GetAxisColor(GetAlignedAxis(axis));
package.AddLineStripVertexCount(2);
package.AddLineStripVertexColor(color.R, color.G, color.B, color.A);
package.AddLineStripVertex(line.StartPoint.X, line.StartPoint.Y, line.StartPoint.Z);
package.AddLineStripVertexColor(color.R, color.G, color.B, color.A);
package.AddLineStripVertex(line.EndPoint.X, line.EndPoint.Y, line.EndPoint.Z);
}
}
/// <summary>
/// Computes move vector, based on new position of mouse and view direction.
/// </summary>
/// <param name="newPosition">New mouse position</param>
/// <param name="viewDirection">view direction</param>
/// <returns>Offset vector wrt Origin</returns>
public Vector GetOffset(Point newPosition, Vector viewDirection)
{
Point hitPoint = Origin;
using (var ray = GetRayGeometry(newPosition, viewDirection))
{
if (hitPlane != null)
{
hitPoint = hitPlane.Intersect(ray).FirstOrDefault() as Point;
}
else if (hitAxis != null)
{
var axis = hitAxis.Cross(viewDirection);
var plane = Plane.ByOriginXAxisYAxis(Origin, hitAxis, axis);
hitPoint = plane.Intersect(ray).FirstOrDefault() as Point;
if (null != hitPoint)
{
var projection = hitAxis.Dot(Vector.ByTwoPoints(Origin, hitPoint));
hitPoint = Origin.Add(hitAxis.Normalized().Scale(projection));
}
else
{
using (var axisLine = RayExtensions.ToOriginCenteredLine(Origin, hitAxis))
{
hitPoint = axisLine.ClosestPointTo(ray);
}
}
}
}
if (hitPoint == null)
{
return(Vector.ByCoordinates(0, 0, 0));
}
return(Vector.ByTwoPoints(Origin, hitPoint));
}