private void SelectObject(object obj)
{
if (obj == null)
{
throw(new ArgumentNullException("obj"));
}
if (obj is GdiPen)
{
GdiPen pen = (GdiPen)obj;
_currentPen = pen;
Win32.SelectObject(_hdc, pen.NativePen);
}
else if (obj is GdiBrush)
{
GdiBrush brush = (GdiBrush)obj;
_currentBrush = brush;
Win32.SelectObject(_hdc, brush.NativeBrush);
}
else if (obj is GdiFont)
{
GdiFont font = (GdiFont)obj;
_currentFont = font;
Win32.SelectObject(_hdc, font.NativeFont);
}
else
{
throw(new Exception("Unknow gdi object"));
}
}
public GdiBrush SelectBrush(GdiBrush brush)
{
if (brush == null)
{
throw (new ArgumentNullException("pen"));
}
if (brush.NativeBrush != IntPtr.Zero)
{
this.SelectObject(brush);
return(brush);
}
GdiBrush gdiBrush = null;
_brushTable.TryGetValue(brush.Key, out gdiBrush);
if (gdiBrush == null)
{
gdiBrush = brush;
_brushTable.Add(gdiBrush.Key, gdiBrush);
}
this.CheckNativeBrush(gdiBrush);
this.SelectObject(gdiBrush);
return(gdiBrush);
}
private void CheckNativeBrush(GdiBrush brush)
{
if (brush.NativeBrush == IntPtr.Zero)
{
brush.SetNativeBrush(Win32.CreateSolidBrush(brush.GdiColor));
}
}
public void FillRectangleExt(GdiBrush brush, int x, int y, int width, int height)
{
if (brush == null)
{
throw (new ArgumentNullException("brush"));
}
this.CheckNativeBrush(brush);
Win32.FillRect(this._hdc, x, y, width, height, brush.NativeBrush);
}
public void FillRectangleExt(GdiBrush brush, Rectangle rect)
{
this.FillRectangleExt(brush, rect.X, rect.Y, rect.Width, rect.Height);
}
protected override void OnPaint(ChartGraphics g)
{
int beginIndex = this.Owner.HorizontalScale.Position;
int endIndex = beginIndex + this.Owner.HorizontalScale.CountBarView;
IBarsData bars = this.Owner.Owner.Bars;
int countBar = bars.Count;
endIndex = Math.Min(endIndex, countBar);
g.SelectPen(this.Color);
GdiBrush brushUp = g.SelectBrush(ColorUp);
GdiBrush brushDown = g.SelectBrush(ColorDown);
int barWidth = 0;
switch (this.Owner.HorizontalScale.Zoom)
{
case ChartBox.ChartHorizontalScale.HorizontalZoom.Smaller:
case ChartBox.ChartHorizontalScale.HorizontalZoom.Small:
barWidth = 0;
break;
case ChartBox.ChartHorizontalScale.HorizontalZoom.Medium:
barWidth = 2;
break;
case ChartBox.ChartHorizontalScale.HorizontalZoom.Larger:
barWidth = 4;
break;
case ChartBox.ChartHorizontalScale.HorizontalZoom.Large:
barWidth = 10;
break;
case ChartBox.ChartHorizontalScale.HorizontalZoom.BigLarge:
barWidth = 24;
break;
}
iBars ibars = this.Owner.Owner.iBars;
for (int i = beginIndex; i < endIndex; i++)
{
Bar bar = ibars.GetBar(i);
int x = this.Owner.HorizontalScale.GetX(i);
int yLow = this.GetY(bar.Low);
int yHigh = this.GetY(bar.High);
if (_barsStyle != FigureBarsStyle.Line)
{
g.DrawLine(x, yLow, x, yHigh);
if (barWidth == 0)
{
continue;
}
int yClose = this.GetY(bar.Close);
int yOpen = this.GetY(bar.Open);
int barWD = barWidth / 2;
int x1 = x - barWD, h = 0, y = 0;
if (bar.Close > bar.Open)
{
h = yOpen - yClose;
y = yClose;
g.FillRectangleExt(brushUp, x1, y, barWidth, h);
}
else if (bar.Close < bar.Open)
{
h = yClose - yOpen;
y = yOpen;
g.FillRectangleExt(brushDown, x1, y, barWidth, h);
}
if (h > 0)
{
g.DrawRectangle(x1, y, barWidth, h);
}
}
else
{
}
}
}
