public TrackballWidget()
: base()
{
base.GLSetup += GtkGL.GLWidget.EnableLighting;
// Create and initialize the quaternion
quat = new GtkGL.Quaternion(0.0, 0.0, 0.0, 1.0);
connectHandlers();
}
public void Rotate(GtkGL.Quaternion q)
{
Quat *= q;
Console.WriteLine("q: " + Quat.ToString());
// Tell our handlers that we have been updated
if (Updated != null)
{
Updated(this, null);
}
}
public static Quaternion operator *(Quaternion q1, Quaternion q2)
{
if(q1 == null) return null;
if(q2 == null) return null;
Vector3b v1 = new Vector3b(q1.x, q1.y, q1.z);
Vector3b v2 = new Vector3b(q2.x, q2.y, q2.z);
double angle = ((q1.w * q2.w) - Vector3b.Dot(v1, v2));
Vector3b cross = Vector3b.Cross(v1, v2);
v1 *= q2.w;
v2 *= q1.w;
Quaternion result = new Quaternion(angle,
(v1.x + v2.x + cross.x),
(v1.y + v2.y + cross.y),
(v1.z + v2.z + cross.z)
);
return result;
}
// Track mouse dragging
void OnMotionNotify(object o, Gtk.MotionNotifyEventArgs e)
{
int ix, iy;
double x, y;
Gdk.ModifierType m;
// Find the current mouse X and Y positions
if (e.Event.IsHint) {
e.Event.Window.GetPointer(out ix, out iy, out m);
x = (double)ix;
y = (double)iy;
} else {
x = e.Event.X;
y = e.Event.Y;
}
if(button1Pressed == true){
// Create a quaternion based on the mouse movement
float[] spinQuat = new float[4];
tb.trackball(ref spinQuat,
(float) ((2.0 * beginX - this.Allocation.Width) / this.Allocation.Width),
(float) ((this.Allocation.Height - 2.0 * beginY) / this.Allocation.Height),
(float) ((2.0 * x - this.Allocation.Width) / this.Allocation.Width),
(float) ((this.Allocation.Height - 2.0 * y) / this.Allocation.Height));
// Add created quaternion to the current quat to get the new spin
// Quaternion newQuat = new Quaternion(spinQuat);
Quaternion newQuat = new Quaternion((double) spinQuat[3],
(double) spinQuat[0],
(double) spinQuat[1],
(double) spinQuat[2]
);
// Apply rotation to all objects
System.Collections.IEnumerator enumerator = GLObjectList.GetEnumerator();
while(enumerator.MoveNext()){
( (GtkGL.IGLObject) enumerator.Current ).Rotate(newQuat);
}
// Reset the "old" X and Y positions
beginX = x;
beginY = y;
}
}