//static readonly Brush tableBrush = new LinearGradientBrush(new Rectangle(0, 0, Consts.tableBlockLength, bmpHeight), Color.LightBlue, Color.DarkBlue, 0f);
private static void DrawTables(FileDBContext db, FileStream fs, Bitmap[] bmps)
{
TableBlock tableBlockHead = db.GetTableBlockHeadNode();
TableBlock previousTable = tableBlockHead;
{
long index = previousTable.ThisPos.PagePos() / Consts.pageSize;
Bitmap bmp = bmps[index];
Graphics g = Graphics.FromImage(bmp);
int length = previousTable.ToBytes().Length;
int startPos = (int)(previousTable.ThisPos - Consts.pageSize * index);
Brush brush = new LinearGradientBrush(new Point(startPos, 0), new Point(startPos + length), Color.DarkOrange, Color.OrangeRed);
g.FillRectangle(brush, startPos, 1, length, bmpHeight - 1);
g.DrawRectangle(boundPen, startPos, 1, length, bmpHeight - 1);
g.Dispose();
}
while (previousTable.NextPos != 0)
{
previousTable.TryLoadNextObj(fs);
TableBlock table = previousTable.NextObj;
long index = table.ThisPos.PagePos() / Consts.pageSize;
Bitmap bmp = bmps[index];
Graphics g = Graphics.FromImage(bmp);
int length = table.ToBytes().Length;
int startPos = (int)(table.ThisPos - Consts.pageSize * index);
Brush brush = new LinearGradientBrush(new Point(startPos, 0), new Point(startPos + length, 0), Color.DarkOrange, Color.OrangeRed);
g.FillRectangle(brush, startPos, 1, length, bmpHeight - 1);
g.DrawRectangle(boundPen, startPos, 1, length, bmpHeight - 1);
g.Dispose();
previousTable = table;
}
}
/// <summary>
/// 把数据库当前的所有skip list结点和所有key value都画到若干个BMP图片里。
/// </summary>
/// <param name="db"></param>
/// <param name="directory"></param>
/// <param name="prefix">图片文件名前缀</param>
public static void SkipListShot(this FileDBContext db, string directory, string prefix = "")
{
string dir = Path.Combine(directory, "skiplists");
Directory.CreateDirectory(dir);
{
TableBlock tableBlockHead = db.GetTableBlockHeadNode();
FileStream fs = db.GetFileStream();
TableBlock previousTable = tableBlockHead;
while (previousTable.NextPos != 0)
{
previousTable.TryLoadNextObj(fs);
TableBlock table = previousTable.NextObj;
PrintTableBlock(table, dir, prefix, db);
previousTable = table;
}
}
}