public void Draw(Color color)
{
Debug.DrawLine(Start, End, color);
if (LeftChild != null)
{
LeftChild.Draw();
}
if (RightChild != null)
{
RightChild.Draw();
}
}
public Image Draw(out int center)
{
center = _lastImageLocationOfStarterNode;
if (!IsChanged) // if the current node and it's childs are up to date, just return the last drawed image.
{
return(_lastImage);
}
var lCenter = 0;
var rCenter = 0;
Image lNodeImg = null, rNodeImg = null;
if (LeftChild != null) // draw left node's image
{
lNodeImg = LeftChild.Draw(out lCenter);
}
if (RightChild != null) // draw right node's image
{
rNodeImg = RightChild.Draw(out rCenter);
}
// draw current node and it's childs (left node image and right node image)
var lSize = new Size();
var rSize = new Size();
var under = (lNodeImg != null) || (rNodeImg != null);// if true the current node has childs
if (lNodeImg != null)
{
lSize = lNodeImg.Size;
}
if (rNodeImg != null)
{
rSize = rNodeImg.Size;
}
var maxHeight = lSize.Height;
if (maxHeight < rSize.Height)
{
maxHeight = rSize.Height;
}
if (lSize.Width <= 0)
{
lSize.Width = (_nodeBg.Width - _freeSpace.Width) / 2;
}
if (rSize.Width <= 0)
{
rSize.Width = (_nodeBg.Width - _freeSpace.Width) / 2;
}
var resSize = new Size
{
Width = lSize.Width + rSize.Width + _freeSpace.Width,
Height = _nodeBg.Size.Height + (under ? maxHeight + _freeSpace.Height : 0)
};
var result = new Bitmap(resSize.Width, resSize.Height);
var g = Graphics.FromImage(result);
g.SmoothingMode = SmoothingMode.HighQuality;
g.FillRectangle(Brushes.White, new Rectangle(new Point(0, 0), resSize));
g.DrawImage(_nodeBg, lSize.Width - _nodeBg.Width / 2 + _freeSpace.Width / 2, 0);
var str = Value.ToString();
g.DrawString(str, font, Brushes.Black, lSize.Width - _nodeBg.Width / 2 + _freeSpace.Width / 2 + (2 + (str.Length == 1 ? 10 : str.Length == 2 ? 5 : 0)) * Coef, _nodeBg.Height / 2f - 12 * Coef);
center = lSize.Width + _freeSpace.Width / 2;
var pen = new Pen(Brushes.Black, 1.2f * Coef)
{
EndCap = LineCap.ArrowAnchor,
StartCap = LineCap.Round
};
float x1 = center;
float y1 = _nodeBg.Height;
float y2 = _nodeBg.Height + _freeSpace.Height;
float x2 = lCenter;
var h = Math.Abs(y2 - y1);
var w = Math.Abs(x2 - x1);
if (lNodeImg != null)
{
g.DrawImage(lNodeImg, 0, _nodeBg.Size.Height + _freeSpace.Height);
var points1 = new List <PointF>
{
new PointF(x1, y1),
new PointF(x1 - w / 6, y1 + h / 3.5f),
new PointF(x2 + w / 6, y2 - h / 3.5f),
new PointF(x2, y2),
};
g.DrawCurve(pen, points1.ToArray(), 0.5f);
}
if (rNodeImg != null)
{
g.DrawImage(rNodeImg, lSize.Width + _freeSpace.Width, _nodeBg.Size.Height + _freeSpace.Height);
x2 = rCenter + lSize.Width + _freeSpace.Width;
w = Math.Abs(x2 - x1);
var points = new List <PointF>
{
new PointF(x1, y1),
new PointF(x1 + w / 6, y1 + h / 3.5f),
new PointF(x2 - w / 6, y2 - h / 3.5f),
new PointF(x2, y2)
};
g.DrawCurve(pen, points.ToArray(), 0.5f);
}
IsChanged = false;
_lastImage = result;
_lastImageLocationOfStarterNode = center;
return(result);
}
