//Recursively find the last child and separate it
public void Unpin()
{
ShapeGraphic tempChild = childShapeGraphic;
ShapeGraphic tempParent = parentShapeGraphic;
childShapeGraphic = new ShapeGraphic();
parentShapeGraphic = new ShapeGraphic();
childShapeGraphic = null;
parentShapeGraphic = null;
if (tempChild != null)
{
if (tempParent == null)
{
tempChild.removeParent();
}
else
{
tempChild.giveParent(tempParent);
}
}
if (tempParent != null)
{
if (tempChild == null)
{
tempParent.removeChild();
}
else
{
tempParent.giveChild(tempChild);
}
}
}
public ShapeGraphic(Color selectedColour, Point selectedPosition)
{
shapeColour = selectedColour;
canvasPosition = selectedPosition;
childShapeGraphic = null;
parentShapeGraphic = null;
copyId = -1;
}
//Recursively find the child who doesn't have a child yet
public void Pin(ShapeGraphic childToPin)
{
if (childShapeGraphic == null)
{
//Find the highest parent in the child graphic
while (true)
{
if (childToPin.hasParent())
{
childToPin = childToPin.getParent();
}
else
{
break;
}
}
childShapeGraphic = childToPin;
childToPin.giveParent(this);
}
else
{
childShapeGraphic.Pin(childToPin);
}
}
public void removeChild()
{
childShapeGraphic = null;
}
public void removeParent()
{
parentShapeGraphic = null;
}
public void giveChild(ShapeGraphic child)
{
childShapeGraphic = child;
}
public void giveParent(ShapeGraphic parent)
{
parentShapeGraphic = parent;
}
//Returns true if a passed shape is pinned to the shape in any way
public bool checkIfAlreadyPinned(ShapeGraphic childToPin)
{
bool result = false;
if (childToPin == this)
{
return(true);
}
if (childShapeGraphic != null)
{
result = childShapeGraphic.checkIfAlreadyPinned(childToPin);
if (result == true)
{
return(true);
}
}
if (parentShapeGraphic != null)
{
result = parentShapeGraphic.checkIfAlreadyPinned(childToPin);
if (result == true)
{
return(true);
}
}
//CHeck all the childToPin's children and parents
if (childToPin.hasChild())
{
if (childShapeGraphic != null)
{
result = childShapeGraphic.checkIfAlreadyPinned(childToPin.getChild());
if (result == true)
{
return(true);
}
}
if (parentShapeGraphic != null)
{
result = parentShapeGraphic.checkIfAlreadyPinned(childToPin.getChild());
if (result == true)
{
return(true);
}
}
}
if (childToPin.hasParent())
{
if (childShapeGraphic != null)
{
result = childShapeGraphic.checkIfAlreadyPinned(childToPin.getParent());
if (result == true)
{
return(true);
}
}
if (parentShapeGraphic != null)
{
result = parentShapeGraphic.checkIfAlreadyPinned(childToPin.getParent());
if (result == true)
{
return(true);
}
}
}
return(false);
}
public ShapeGraphic()
{
childShapeGraphic = null;
parentShapeGraphic = null;
copyId = -1;
}
//Check is two shapes in a pin mass are connected at any points
private bool checkIfPinned(ShapeGraphic pinnee, ShapeGraphic pinner)
{
return(false);
}
