/// <summary>
/// 清除数据
/// </summary>
protected virtual void Clear()
{
if (_rootCanvas == null || FastSourceInstance.GetCachedCandleList().Count == 0 || CommonData.ViewPortWidth == 0 || CommonData.ViewPortHeight == 0)
{
return;
}
_rootCanvas.ClearVisual();
}
/// <summary>
/// 画y轴
/// </summary>
private void ProduceYaxis()
{
if (_rootCanvas == null || CommonData.ViewPortWidth == 0 || CommonData.ViewPortHeight == 0)
{
return;
}
_rootCanvas.ClearVisual();
//y轴刻度位置集合
List <Point> YaxisPoints = new List <Point>();
//y轴刻度值集合
List <double> YValues = new List <double>();
double ymax = CommonData.YMaxValue;
double ymin = CommonData.YMinValue;
if (ymax == 0 && ymin == 0)
{
return;
}
CommonData.Scale = CommonData.ViewPortHeight / (ymax - ymin);
//y轴刻度之间的间隔，这里始终显示5个刻度
double span = Math.Round((ymax - ymin) / 5, NumberPointCount);
double yaxis = ymin;
//y轴路径
StreamGeometry axispathStream = new StreamGeometry();
StreamGeometryContext axisContext = axispathStream.Open();
while (Math.Round(ymax - yaxis, 2) >= 0)
{
//循环画路径
YValues.Add(Math.Round(yaxis, 2));
double yvalue = CommonData.ViewPortHeight - (yaxis - ymin) * CommonData.Scale + CommonData.HeightOffet / 2;
Point p = new Point(CommonData.ViewPortWidth, yvalue);
YaxisPoints.Add(p);
axisContext.BeginFigure(new Point(0, p.Y), false, false);
axisContext.LineTo(p, true, false);
yaxis += span;
if (span == 0)
{
break;
}
}
axisContext.Close();
//在画布画路径
_rootCanvas.DrawingYaxis(axispathStream, 1, YaxisPoints, YValues);
}