public Image DrawBarList(BarListImpl bl, BarInterval bi, Color up, Color down)
{
bl.DefaultInterval = bi;
Bitmap sl = new Bitmap(w, h);
Graphics g = Graphics.FromImage(sl);
high = Calc.HH(bl);
low = Calc.LL(bl);
decimal range = high - low;
int pixperdollar = range != 0 ? (int)(h / range) : 0;
int pixperbar = bl.Count != 0 ? (int)(w / (decimal)bl.Count) : 0;
for (int i = 0; i < bl.Count; i++)
{
Bar b = bl[i, bi];
Pen p = new Pen(b.Close >= b.Open ? up : down);
g.DrawLine(p, i * pixperbar, h - (int)((b.Low - low) * pixperdollar), i * pixperbar, h - (int)((b.High - low) * pixperdollar));
}
return(sl);
}
void Chart_Paint(object sender, PaintEventArgs e)
{
if (bl != null)
{
highesth = Calc.HH(bl);
lowestl = Calc.LL(bl);
barc = bl.Count;
}
if ((bl == null) || (bl.Count == 0))
{
return;
}
// setup to draw
Pen p = new Pen(Color.Black);
g = e.Graphics;
Form f = (Form)sender;
g.Clear(f.BackColor);
// get title
Text = Title;
// get window
r = ClientRectangle;
// get number of pixels available for each bar, based on screensize and barcount
pixperbar = (((decimal)r.Width - (decimal)border - ((decimal)border / 3)) / (decimal)barc);
// pixels for each time stamp
const int pixperbarlabel = 60;
// number of labels we have room to draw
int numbarlabels = (int)((double)(r.Width - border - ((double)border / 3)) / pixperbarlabel);
// draw a label every so many bars (assume every bar to star)
int labeleveryX = 1;
// if there's more bars than space
if (barc > numbarlabels)
{
labeleveryX = (int)Math.Round(((double)barc / numbarlabels));
}
// get dollar range for chart
decimal range = (highesth - lowestl);
// get pixels available for each dollar of movement
pixperdollar = range == 0 ? 0 : (((decimal)r.Height - (decimal)border * 2) / range);
Color fgcol = (f.BackColor == Color.Black) ? Color.White : Color.Black;
// x-axis
g.DrawLine(new Pen(fgcol), (int)(border / 3), r.Height - border, r.Width - border, r.Height - border);
// y-axis
g.DrawLine(new Pen(fgcol), r.Width - border, r.Y + border, r.Width - border, r.Height - border);
const int minxlabelwidth = 30;
int lastlabelcoord = -500;
for (int i = 0; i < barc; i++)
{
// get bar color
Color bcolor = (bl[i].Close > bl[i].Open) ? Color.Green : Color.Red;
p = new Pen(bcolor);
try
{
// draw high/low bar
g.DrawLine(p, getX(i), getY(bl[i].Low), getX(i), getY(bl[i].High));
// draw open bar
g.DrawLine(p, getX(i), getY(bl[i].Open), getX(i) - (int)(pixperbar / 3), getY(bl[i].Open));
// draw close bar
g.DrawLine(p, getX(i), getY(bl[i].Close), getX(i) + (int)(pixperbar / 3), getY(bl[i].Close));
// draw time labels (time @30min and date@noon)
// if interval is intra-day
if (bl.DefaultInterval != BarInterval.Day)
{
// every 6 bars draw the bartime
if ((i % labeleveryX) == 0)
{
g.DrawString(bl[i].Bartime.ToString(), f.Font, new SolidBrush(fgcol), getX(i), r.Height - (f.Font.GetHeight() * 3));
}
// if it's noon, draw the date
if (bl[i].Bartime == 1200)
{
g.DrawString(bl[i].Bardate.ToString(), f.Font, new SolidBrush(fgcol), getX(i), r.Height - (float)(f.Font.GetHeight() * 1.5));
}
}
else // otherwise it's daily data
{
// get date
int[] date = Calc.Date(bl[i].Bardate);
int[] lastbardate = date;
// get previous bar date if we have one
if ((i - 1) > 0)
{
lastbardate = Calc.Date(bl[i - 1].Bardate);
}
// if we have room since last time we drew the year
if ((getX(lastlabelcoord) + minxlabelwidth) <= getX(i))
{
// get coordinate for present days label
lastlabelcoord = i;
// draw day
g.DrawString(date[2].ToString(), f.Font, new SolidBrush(fgcol), getX(i), r.Height - (f.Font.GetHeight() * 3));
}
// if it's first bar or a new month
if ((i == 0) || (lastbardate[1] != date[1]))
{
// get the month
string ds = date[1].ToString();
// if it sfirst bar or the year has changed, add year to month
if ((i == 0) || (lastbardate[0] != date[0]))
{
ds += '/' + date[0].ToString();
}
// draw the month
g.DrawString(ds, f.Font, new SolidBrush(fgcol), getX(i), r.Height - (float)(f.Font.GetHeight() * 1.5));
}
}
}
catch (OverflowException) { }
}
// DRAW YLABELS
// max number of even intervaled ylabels possible on yaxis
int numlabels = (int)((r.Height - border * 2) / (f.Font.GetHeight() * 1.5));
// nearest price units giving "pretty" even intervaled ylabels
decimal priceunits = NearestPrettyPriceUnits(highesth - lowestl, numlabels);
// starting price point from low end of range, including lowest low in barlist
decimal lowstart = lowestl - ((lowestl * 100) % (priceunits * 100)) / 100;
// original "non-pretty" price units calc
//decimal priceunits = (highesth-lowestl)/numlabels;
Pen priceline = new Pen(Color.BlueViolet);
priceline.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot;
for (decimal i = 0; i <= numlabels; i++)
{
decimal price = lowstart + (i * priceunits);
g.DrawString(price.ToString("C"), f.Font, new SolidBrush(fgcol), r.Width - border, getY(price) - f.Font.GetHeight());
g.DrawLine(priceline, border / 3, getY(price), r.Width - border, getY(price));
}
DrawLabels();
}
