private Point GetCp4(Rect rect, Point p1, Point p2)
{
var rightLineEquation = new LineEquation(p1, p2);
var dock = Dock;
var isBottom = (dock & TabItemDock.Bottom) == TabItemDock.Bottom;
if (isBottom)
{
return rightLineEquation.IntersectWithHorizontalLine(p2.X, rect.Bottom);
}
var isTop = (dock & TabItemDock.Top) == TabItemDock.Top;
if (isTop)
{
return rightLineEquation.IntersectWithHorizontalLine(p2.X, rect.Top);
}
var isLeft = (dock & TabItemDock.Left) == TabItemDock.Left;
if (isLeft)
{
return rightLineEquation.IntersectWithVerticalLine(p2.Y, rect.Left);
}
return rightLineEquation.IntersectWithVerticalLine(p2.Y, rect.Right);
}
private Point GetCp2(Rect rect, Point p1, Point p2)
{
var leftLineEquation = new LineEquation(p1, p2);
var dock = Dock;
var isBottom = (dock & TabItemDock.Bottom) == TabItemDock.Bottom;
if (isBottom)
{
// the 1st control point is the intersection between the slope line and the base line.
return leftLineEquation.IntersectWithHorizontalLine(p2.X, rect.Top);
}
var isTop = (dock & TabItemDock.Top) == TabItemDock.Top;
if (isTop)
{
return leftLineEquation.IntersectWithHorizontalLine(p2.X, rect.Bottom);
}
var isLeft = (dock & TabItemDock.Left) == TabItemDock.Left;
if (isLeft)
{
return leftLineEquation.IntersectWithVerticalLine(p2.Y, rect.Right);
}
return leftLineEquation.IntersectWithVerticalLine(p2.Y, rect.Left);
}