//-------------------------------------------------------------------------
public bool Pick(Int32 fromX, Int32 fromY, Int32 destX, Int32 destY, float value, ref ViPixelNavigatePickData result)
{
Int32 deltaX = destX - fromX;
Int32 deltaY = destY - fromY;
if (deltaX == 0 && deltaY == 0)
{
return(false);
}
float absDeltaX = Math.Abs((float)deltaX);
float absDeltaY = Math.Abs((float)deltaY);
if (absDeltaX >= absDeltaY)
{
if (deltaX < 0)
{
return(_PickXNegative(fromX, fromY, destX, destY, value, ref result));
}
else
{
return(_PickXPositive(fromX, fromY, destX, destY, value, ref result));
}
}
else
{
if (deltaY < 0)
{
return(_PickYNegative(fromX, fromY, destX, destY, value, ref result));
}
else
{
return(_PickYPositive(fromX, fromY, destX, destY, value, ref result));
}
}
}
//-------------------------------------------------------------------------
bool _PickYPositive(Int32 fromX, Int32 fromY, Int32 destX, Int32 destY, float value, ref ViPixelNavigatePickData result)
{
Int32 deltaX = destX - fromX;
Int32 deltaY = destY - fromY;
float fromCenterX = (float)fromX + 0.5f;
float fromCenterY = (float)fromY + 0.5f;
float fDeltaX = (float)deltaX / Math.Abs((float)deltaY);
float fDeltaY = 1.0f;
float pickX = fromCenterX;
float pickY = fromCenterY;
for (Int32 idx = fromY; idx < destY; ++idx)
{
pickX += fDeltaX;
pickY += fDeltaY;
Int32 newCellX = (Int32)pickX;
Int32 newCellY = (Int32)pickY;
if (_steps[newCellX + newCellY * _sizeX].Cost == value)
{
result.blockX = newCellX;
result.blockY = newCellY;
result.lastFreeX = (Int32)(pickX - fDeltaX);
result.lastFreeY = (Int32)(pickY - fDeltaY);
return(true);
}
}
if (_steps[destX + destY * _sizeX].Cost == value)
{
result.blockX = destX;
result.blockY = destY;
result.lastFreeX = (Int32)(pickX);
result.lastFreeY = (Int32)(pickY);
return(true);
}
return(false);
}
//-------------------------------------------------------------------------
public bool Pick(Int32 fromX, Int32 fromY, Int32 destX, Int32 destY)
{
ViPixelNavigatePickData data = new ViPixelNavigatePickData();
return(Pick(fromX, fromY, destX, destY, 1.0f, ref data));
}
