private double CalSegDurationSecond(XAxisPlotElementInfo axisX, Graphics graphics, double durationTimeMillisecond)
{
string labelText = this.GetLabelText(DateTime.Now, double.NaN);
SizeF labelTextSize = graphics.MeasureString(labelText, axisX.Font);
float labelTextMinWidth = labelTextSize.Width * 2;
int maxLabelCount = (int)(axisX.Area.Width / labelTextMinWidth);
double separatorSecond;
double segDurationMillisecond = durationTimeMillisecond / maxLabelCount;
if (segDurationMillisecond < 500)
{
separatorSecond = 0.5d;
}
else if (segDurationMillisecond < 1000)
{
separatorSecond = 1d;
}
else
{
separatorSecond = (int)Math.Ceiling(segDurationMillisecond / 1000);
}
return(separatorSecond);
}
private void DrawTimeAxis(Graphics graphics, WavePlotPara plotPara)
{
XAxisPlotElementInfo axisX = this._xAxis;
if (axisX == null)
{
return;
}
//时间图背景
RectangleF rectangleTimeArea = axisX.Area;
graphics.FillRectangle(axisX.BackgroudColor, rectangleTimeArea);
if (plotPara == null)
{
return;
}
//边框
//graphics.DrawLine(this._borderPen, rectangleTimeArea.X, rectangleTimeArea.Y, rectangleTimeArea.X, rectangleTimeArea.Y + rectangleTimeArea.Height);
//float borderX = rectangleTimeArea.X + rectangleTimeArea.Width - this._borderPen.Width;
//graphics.DrawLine(this._borderPen, borderX, rectangleTimeArea.Y, borderX, rectangleTimeArea.Y + rectangleTimeArea.Height);
//graphics.DrawLine(this._borderPen, rectangleTimeArea.X, rectangleTimeArea.Y, rectangleTimeArea.X + rectangleTimeArea.Width, rectangleTimeArea.Y);
//绘制起始时间-毫秒
double beginTimeMillisecond = plotPara.SBTOMillisecond;
//绘制结束时间-毫秒
double endTimeMillisecond = plotPara.GetSETOMillisecond();
//绘制总时长
double durationTimeMillisecond = endTimeMillisecond - beginTimeMillisecond;
if (durationTimeMillisecond <= 0d)
{
return;
}
//绘制时间间隔
double separatorSecond = this.CalSegDurationSecond(axisX, graphics, durationTimeMillisecond);
//绘制起始时间-秒
double beginTimeSecond = beginTimeMillisecond / 1000;
//绘制时间-秒
double timeSecond = PlotConstant.ZEROR_D;
if (beginTimeMillisecond > PlotConstant.ZEROR_D)
{
int mult = (int)(beginTimeSecond / separatorSecond);
double mod = beginTimeSecond % separatorSecond;
if (mod - separatorSecond < PlotConstant.ZEROR_D)
{
mult = mult + 1;
}
timeSecond = separatorSecond * mult;
}
//绘制时间
DateTime time = plotPara.BaseTime.AddSeconds(timeSecond);
DateTime endTime = plotPara.BaseTime.AddMilliseconds(endTimeMillisecond);
float labelHeight = rectangleTimeArea.Height / 3;
float y1 = rectangleTimeArea.Y + rectangleTimeArea.Height;
float y2 = y1 - labelHeight;
float y3 = y1 - labelHeight / 2;
float labelX, labelSmallX;
double separatorSecondHalf = separatorSecond / 2;
float secondLength = (float)(axisX.Area.Width / (durationTimeMillisecond / 1000));
string labelText;
SizeF labelTextSize;
float labelTextX, lastLabelTextRightX = 0f;
float labelTextY = rectangleTimeArea.Y + labelHeight / 2;
AxisLabelLocation labelTextLocation = AxisLabelLocation.First;
var contentWidth = axisX.Area.Width;
Pen pen = axisX.Pen;
while (true)
{
//刻度-x
labelX = (float)(secondLength * (timeSecond - beginTimeSecond));
labelSmallX = (float)(secondLength * (timeSecond - beginTimeSecond - separatorSecondHalf));
//绘制刻度文本
labelText = this.GetLabelText(time, separatorSecond);
labelTextSize = graphics.MeasureString(labelText, axisX.Font);
labelTextX = labelX - labelTextSize.Width / 2;
switch (labelTextLocation)
{
case AxisLabelLocation.First:
if (labelTextX < PlotConstant.ZEROR_D && beginTimeMillisecond <= PlotConstant.ZEROR_D)
{
labelTextX = (float)PlotConstant.ZEROR_D;
}
labelTextLocation = AxisLabelLocation.Middle;
break;
case AxisLabelLocation.Middle:
if (labelTextX + labelTextSize.Width - contentWidth > PlotConstant.ZEROR_D)
{
labelTextX = contentWidth - labelTextSize.Width;
}
break;
case AxisLabelLocation.Last:
if (labelTextX + labelTextSize.Width - contentWidth > PlotConstant.ZEROR_D)
{
labelTextX = contentWidth - labelTextSize.Width;
if (labelTextX - lastLabelTextRightX < PlotConstant.ZEROR_D)
{
if (labelSmallX - contentWidth < PlotConstant.ZEROR_D)
{
graphics.DrawLine(pen, labelSmallX, y1, labelSmallX, y3);
}
return;
}
}
break;
default:
throw new NotImplementedException();
}
graphics.DrawString(labelText, axisX.Font, axisX.ForeColor, labelTextX, labelTextY);
lastLabelTextRightX = labelTextX + labelTextSize.Width;
//绘制刻度
if (labelSmallX > PlotConstant.ZEROR_D)
{
graphics.DrawLine(pen, labelSmallX, y1, labelSmallX, y3);
}
if (labelX - contentWidth < PlotConstant.ZEROR_D)
{
graphics.DrawLine(pen, labelX, y1, labelX, y2);
}
if (labelTextLocation == AxisLabelLocation.Last)
{
break;
}
timeSecond += separatorSecond;
time = plotPara.BaseTime.AddSeconds(timeSecond);
if (time >= endTime)
{
time = endTime;
labelTextLocation = AxisLabelLocation.Last;
}
}
}