Image CreatePreviewImage(XmlNode dataNode)
{
int height = 240;
int width = 530;
int diameter = 40;
Bitmap bmp = new Bitmap(width, height);
Graphics g = Graphics.FromImage(bmp);
BiTreeGenerator biTreeGenerator = new BiTreeGenerator();
biTreeGenerator.DataNode = dataNode;
biTreeGenerator.IsPreview = true;
biTreeGenerator.GenerateTree(diameter, Color.HotPink);
//注意：这里我还是使用先序遍历，因为用什么遍历方法无很大关系，关键是最终的结果要正确
IIterator preOrderTreeIterator = new BiTreePreOrderIterator(biTreeGenerator.RootNode);
IIterator preOrderTreeIterator1 = new BiTreePreOrderIterator(biTreeGenerator.RootLineNode);
if (preOrderTreeIterator != null)
{
for (IIterator iterator = preOrderTreeIterator.First(); !preOrderTreeIterator.IsDone(); iterator = preOrderTreeIterator.Next())
{
if (iterator.CurrentItem != null)
{
iterator.CurrentItem.BackColor = Color.HotPink;
iterator.CurrentItem.Draw(g);
}
}
}
if (preOrderTreeIterator1 != null)
{
for (IIterator iterator = preOrderTreeIterator1.First(); !preOrderTreeIterator1.IsDone(); iterator = preOrderTreeIterator1.Next())
{
if (iterator.CurrentItem != null)
{
iterator.CurrentItem.Draw(g);
}
}
}
return(bmp);
}
//生成一棵二叉树,并把生成的位图返回
Bitmap GenerateTree(bool isFullTree)
{
int height = 240;
int width = 530;
int diameter = 40;
biTreeGenerator.IsFullTree = isFullTree;
biTreeGenerator.GenerateTree1(diameter, Color.HotPink);
Bitmap bmp = new Bitmap(width, height);
Graphics g = Graphics.FromImage(bmp);
IIterator preOrderTreeIterator = new BiTreePreOrderIterator(biTreeGenerator.RootNode);
IIterator preOrderTreeIterator1 = new BiTreePreOrderIterator(biTreeGenerator.RootLineNode);
if (preOrderTreeIterator != null)
{
for (IIterator iterator = preOrderTreeIterator.First(); !preOrderTreeIterator.IsDone(); iterator = preOrderTreeIterator.Next())
{
if (iterator.CurrentItem != null)
{
iterator.CurrentItem.BackColor = Color.HotPink;
iterator.CurrentItem.Draw(g);
}
}
}
if (preOrderTreeIterator1 != null)
{
for (IIterator iterator = preOrderTreeIterator1.First(); !preOrderTreeIterator1.IsDone(); iterator = preOrderTreeIterator1.Next())
{
if (iterator.CurrentItem != null)
{
iterator.CurrentItem.Draw(g);
}
}
}
return(bmp);
}
