private void UpdateShadowCasters()
{
var shadowCaster = LunarHorizon.SunPosition(_currentTime);
OpenGLWindow.TheWorld.Terrain.UpdateShadowcaster(shadowCaster);
OpenGLWindow.Invalidate();
}
public override void Drag(OpenGLControlWrapper w, MouseEventArgs e)
{
if (_dragging == DragState.Idle)
{
return;
}
Lookat = Target.Position;
switch (_dragging)
{
case DragState.ArcBalling: // moving
{
var relativePosition = _eye - _lookat;
var lookToward = new Vector3d(-relativePosition);
lookToward.Normalize();
var right = Vector3d.Cross(lookToward, Up);
var yaw = YawGain * (e.Location.X - _lastLocation.X);
var yawMatrix = Matrix4d.CreateFromAxisAngle(Up, yaw);
var pitch = PitchGain * (e.Location.Y - _lastLocation.Y);
var pitchMatrix = Matrix4d.CreateFromAxisAngle(right, pitch);
var distance = relativePosition.Length;
relativePosition = Vector3d.TransformVector(relativePosition, yawMatrix * pitchMatrix);
relativePosition.Normalize();
relativePosition = relativePosition * distance;
_eye = _lookat + relativePosition;
relativePosition.Normalize();
Up = Vector3d.Cross(relativePosition, right);
Up.Normalize();
_lastLocation = e.Location;
}
break;
case DragState.Scaling: // scaling
{
var d = ZoomGain * (e.Location.Y - _lastLocation.Y);
var zoom = Math.Exp(d);
var rp = _startPosition * (ZoomFactor * zoom);
_eye = _lookat + rp;
}
break;
case DragState.RotatingUp:
{
var centerX = w.Width / 2;
var centerY = w.Height / 2;
var v1 = new Vector3d(_lastLocation.X - centerX, _lastLocation.Y - centerY, 0d);
var v2 = new Vector3d(e.Location.X - centerX, e.Location.Y - centerY, 0d);
var v3 = Vector3d.Cross(v1, v2);
var v3Mag = v3[2];
var angDeg = Math.Asin(v3Mag / (v1.Length * v2.Length)); //*180d/Math.PI
var axis = _lookat - _eye;
axis.Normalize();
var mat = Matrix4d.CreateFromAxisAngle(axis, -angDeg);
Up = Vector3d.TransformVector(Up, mat); // was _startUp
Up.Normalize();
_lastLocation = e.Location; // not sure about this
}
break;
}
Dirty = true;
w.Invalidate();
}
