/// <summary>
/// Moves a single GridSegment in a direction by a distance specified in pixels
/// </summary>
/// <param name="direction">Direction in which to move</param>
/// <param name="distance">Integer number of pixels to move by</param>
/// <param name="element">GridSegment to move</param>
private void MoveElement(Directions direction, int distance, GridSegment element)
{
double left = Canvas.GetLeft(element);
double top = Canvas.GetTop(element);
bool overEdge = false;
switch (direction)
{
case Directions.Left:
left -= distance;
if (left <= -elementWidth)
{
left += (currentSegmentNumberHorizontal + 1) * elementWidth;
element.Y += (currentSegmentNumberHorizontal + 1);
overEdge = true;
}
break;
case Directions.Right:
left += distance;
if (left > currentSegmentNumberHorizontal * elementWidth) //Necessary to ensure that the 'Extra' segments are always to the right and don't overlap with the 'first' segment
{
left -= (currentSegmentNumberHorizontal + 1) * elementWidth;
element.Y -= (currentSegmentNumberHorizontal + 1);
overEdge = true;
}
break;
case Directions.Up:
top -= distance;
if (top <= -elementHeight)
{
top += (currentSegmentNumberVertical + 1) * elementHeight;
element.X += (currentSegmentNumberVertical + 1);
overEdge = true;
}
break;
case Directions.Down:
top += distance;
if (top > currentSegmentNumberVertical * elementHeight) //Necessary to ensure that the 'Extra' segments are always to the bottom and don't overlap with the 'first' segment
{
top -= (currentSegmentNumberVertical + 1) * elementHeight;
element.X -= (currentSegmentNumberVertical + 1);
overEdge = true;
}
break;
}
if (overEdge)
{
element.RefreshCells();
}
Canvas.SetLeft(element, left);
Canvas.SetTop(element, top);
}
private void Grid_SizeChanged(object sender, SizeChangedEventArgs e)
{
int newSegmentNumberHorizontal = (int)Math.Ceiling(canvasWidth / elementWidth);
int newSegmentNumberVertical = (int)Math.Ceiling(canvasHeight / elementHeight);
if (canvasGrid.Children.Count == 0)
{
AddSegments(0, 0, newSegmentNumberHorizontal, newSegmentNumberVertical, 0, 0, 0, 0);
}
else
{
IInputElement element = canvasGrid.InputHitTest(new Point(0, 0));
GridSegment firstSegment = Heirarchy.FindParent <GridSegment>((DependencyObject)element);
if (newSegmentNumberHorizontal < currentSegmentNumberHorizontal)
{
for (int i = currentSegmentNumberHorizontal; i > newSegmentNumberHorizontal; i--)
{
IEnumerable <GridSegment> segments = (from c in canvasGrid.Children.Cast <GridSegment>() where c.Y == (firstSegment.Y + i) select c);
RemoveSegmentsList(segments);
}
}
else
{
AddSegments(currentSegmentNumberHorizontal + 1, 0, newSegmentNumberHorizontal, currentSegmentNumberVertical, firstSegment.Y, firstSegment.X, Canvas.GetLeft(firstSegment), Canvas.GetTop(firstSegment));
}
if (newSegmentNumberVertical < currentSegmentNumberVertical)
{
for (int i = currentSegmentNumberVertical; i > newSegmentNumberVertical; i--)
{
IEnumerable <GridSegment> segments = (from c in canvasGrid.Children.Cast <GridSegment>() where c.X == (firstSegment.X + i) select c);
RemoveSegmentsList(segments);
}
}
else
{
AddSegments(0, currentSegmentNumberVertical + 1, newSegmentNumberHorizontal, newSegmentNumberVertical, firstSegment.Y, firstSegment.X, Canvas.GetLeft(firstSegment), Canvas.GetTop(firstSegment));
}
}
currentSegmentNumberHorizontal = newSegmentNumberHorizontal;
currentSegmentNumberVertical = newSegmentNumberVertical;
e.Handled = true;
}
/// <summary>
/// Adds Segments within a range specified and at a displacement specified
/// </summary>
/// <param name="horizontalStartNumber">Beginning point in horizontal range</param>
/// <param name="verticalStartNumber">Beginning point in vertical range</param>
/// <param name="horizontalEndNumber">end point in horizontal range</param>
/// <param name="verticalEndNumber">end point in vertical range</param>
/// <param name="x">Segment X value from which to begin</param>
/// <param name="y">Segment Y value from which to begin</param>
/// <param name="leftMargin">left displacement</param>
/// <param name="topMargin">top displacement</param>
private void AddSegments(int horizontalStartNumber, int verticalStartNumber, int horizontalEndNumber, int verticalEndNumber, int y, int x, double leftMargin, double topMargin)
{
for (int i = horizontalStartNumber; i <= horizontalEndNumber; i++)
{
for (int j = verticalStartNumber; j <= verticalEndNumber; j++)
{
GridSegment _segmentToAdd = new GridSegment();
_segmentToAdd.X = (x + j);
_segmentToAdd.Y = (y + i);
canvasGrid.Children.Add(_segmentToAdd);
double left = elementWidth * i + leftMargin;
double top = elementHeight * j + topMargin;
Canvas.SetLeft(_segmentToAdd, left);
Canvas.SetTop(_segmentToAdd, top);
_segmentToAdd.RefreshCells();
}
}
}
