/// <summary>
/// 绘制下方时间轴
/// </summary>
/// <param name="dc"></param>
/// <param name="left"></param>
/// <param name="top"></param>
/// <param name="width"></param>
/// <param name="height"></param>
void DrawTimeLine(DrawingContext dc, double left, double top, double width, double height)
{
//每条记录的宽度
var itemOffset = this.ChartWidth / TotalItemCount;
//draw time line
var yearLast = 0;
for (var i = 0; i < TotalItemCount; i++)
{
var xoffset = (int)(i * itemOffset) + left + 0.5;
var year = priceInfo.PriceList[i].Date.Year;//(int)(priceInfo.PriceList[i].Date / 10000);
if (year > yearLast)
{
//格式文本，指定位置
FormattedText txt = new FormattedText(year.ToString(),
System.Globalization.CultureInfo.CurrentCulture,
FlowDirection.LeftToRight, new Typeface("Verdana"),
12, new SolidColorBrush(Color.FromRgb(64, 64, 64)));
//绘制文本
dc.DrawText(txt, new Point(xoffset, top + height - 16));
}
yearLast = year;
}
//draw curve line
var highest = priceInfo.getHighestPrice(0, TotalItemCount).High;
var lowest = priceInfo.getLowestPrice(0, TotalItemCount).Low;
var pixelcount = 3;
var inc = (int)(TotalItemCount * pixelcount / this.ChartWidth);
if (inc == 0)
{
inc = 1;
}
//var color = "#30b8f3";
var pen = getPen(48, 184, 243, 1);
//draw line curve.
PathFigure pf = new PathFigure();
PathGeometry pg = new PathGeometry();
pg.Figures.Add(pf);
for (var i = 0; i < TotalItemCount; i += inc)
{
var xoffset = (int)(i * itemOffset) + 0.5 + left;
var yClose = (int)((highest - priceInfo.PriceList[i].Close) / (highest - lowest) * (height - 12)) + 0.5 + top;
if (i == 0)
{
pf.StartPoint = new Point(xoffset, yClose);
}
else
{
pf.Segments.Add(new LineSegment(new Point(xoffset, yClose), true));
}
}
dc.DrawGeometry(Brushes.Transparent, pen, pg);
//draw item time region button
double x = (int)(drawItemStartIndex * itemOffset) + left + 0.5;
var xwidth = (int)(drawItemCount * itemOffset);
var brush = getBrush(224, 224, 255, 128);
pen = getPen(224, 224, 255, 1, 128);
dc.DrawRectangle(brush, pen, new Rect(x, top, xwidth, height));
}
