/// <summary>
/// 子类重写此函数时,必须设置Y轴宽度
/// </summary>
/// <param name="axisCanvas">画布</param>
/// <param name="seriesCollection">Series集合</param>
/// <returns>Label的Y列表</returns>
protected override List <double> PrimitiveDrawY(Canvas axisCanvas, ChartCollection <ISeries> seriesCollection)
{
this._labelTextSize = this.MeasureLabelTextSize();
axisCanvas.Width = base.CalculateAxisSize(this._labelTextSize.Width);
this._axisData = this.CreateAxisData(seriesCollection);
return(this.DrawY(axisCanvas));
}
private double CalculateYLabelStep(DateTimeAxisData axisData)
{
double labelStepMilliseconds = this._labelStep != null ? this._labelStep.Value.TotalMilliseconds : double.NaN;
if (double.IsNaN(labelStepMilliseconds))
{
int labelCount = (int)(this._axisCanvas.Height / ChartConstant.DEFAULT_STEP_SIZE);
if (this._axisCanvas.Height % ChartConstant.DEFAULT_STEP_SIZE > ChartConstant.ZERO_D)
{
labelCount += 1;
}
if (labelCount == 0)
{
labelStepMilliseconds = axisData.Area.TotalMilliseconds;
}
else
{
TimeSpan intervalTimeLength = TimeSpan.FromMilliseconds(axisData.Area.TotalMilliseconds / labelCount);//一个刻度内时长
labelStepMilliseconds = this.AdjustIntervalTimeLength(intervalTimeLength);
}
}
return(labelStepMilliseconds);
}
private double CalculateXLabelStep(DateTimeAxisData axisData)
{
double labelStepMilliseconds = this._labelStep != null ? this._labelStep.Value.TotalMilliseconds : double.NaN;
if (double.IsNaN(labelStepMilliseconds))
{
const double INTERVAL = 20d;
double labelTextSpace = INTERVAL + this._labelTextSize.Width * 1.5d;
int count = (int)(this._axisCanvas.Width / labelTextSpace);
if (count == 0)
{
labelStepMilliseconds = axisData.Area.TotalMilliseconds;
}
else
{
TimeSpan intervalTimeLength = TimeSpan.FromMilliseconds(axisData.Area.TotalMilliseconds / count);//一个刻度内时长
labelStepMilliseconds = this.AdjustIntervalTimeLength(intervalTimeLength);
}
}
return(labelStepMilliseconds);
}
private List <double> DrawXAxisLeftToRight(Canvas axisCanvas, DateTimeAxisData axisData, double labelStepMilliseconds, double labelStepSize)
{
List <double> xList = new List <double>();
double axisWidth = axisCanvas.Width;
double left = ChartConstant.ZERO_D;
double lastLabelX = ChartConstant.ZERO_D;
DateTime time = axisData.MinValue;
AxisLabelLocation labelTextLocation = AxisLabelLocation.First;
double labelTextWidth = this._labelTextSize.Width;
double labelTextWidthHalf = labelTextWidth / 2;
double offset = labelTextWidth / 2;
TextBlock label;
bool addLabelControl;
double x = left;
while (true)
{
label = ChartHelper.CreateLabelControl(this, this.CreateAxisText(time));
if (axisWidth - labelTextWidth > ChartConstant.LABEL_TEXT_INTERVAL)
{
addLabelControl = false;
switch (labelTextLocation)
{
case AxisLabelLocation.First:
this._axisCanvas.Children.Add(label);
addLabelControl = true;
Canvas.SetLeft(label, left);
lastLabelX = left + labelTextWidth;
labelTextLocation = AxisLabelLocation.Middle;
break;
case AxisLabelLocation.Middle:
left += labelStepSize;
offset = left - labelTextWidthHalf - lastLabelX;
if (offset >= ChartConstant.LABEL_TEXT_INTERVAL)
{
axisCanvas.Children.Add(label);
addLabelControl = true;
Canvas.SetLeft(label, left - labelTextWidthHalf);
lastLabelX = left + labelTextWidth;
}
else if (offset > 0)
{
axisCanvas.Children.Add(label);
addLabelControl = true;
Canvas.SetLeft(label, left - labelTextWidthHalf + offset);
lastLabelX = left + labelTextWidth + offset;
}
break;
case AxisLabelLocation.Last:
if (lastLabelX + labelTextWidth + ChartConstant.LABEL_TEXT_INTERVAL <= axisWidth)
{
axisCanvas.Children.Add(label);
addLabelControl = true;
Canvas.SetRight(label, ChartConstant.ZERO_D);
lastLabelX = axisWidth;
}
break;
default:
throw new NotImplementedException();
}
if (addLabelControl)
{
if (base.IsAxisXBottom())
{
Canvas.SetBottom(label, ChartConstant.LABEL_TEXT_INTERVAL);
}
else
{
Canvas.SetTop(label, ChartConstant.LABEL_TEXT_INTERVAL);
}
}
}
if (labelTextLocation == AxisLabelLocation.Last)
{
if (this._showLastLabel)
{
xList.Add(x);
}
break;
}
xList.Add(x);
time = time.AddMilliseconds(labelStepMilliseconds);
if (time >= axisData.MaxValue)
{
x = this._axisCanvas.Width;
time = axisData.MaxValue;
labelTextLocation = AxisLabelLocation.Last;
}
else
{
x += labelStepSize;
}
}
return(xList);
}
/// <summary>
/// 绘制X轴
/// </summary>
/// <param name="axisCanvas">画布</param>
/// <param name="seriesCollection">Series集合</param>
/// <returns>Label的X列表</returns>
protected override List <double> PrimitiveDrawX(Canvas axisCanvas, ChartCollection <ISeries> seriesCollection)
{
this._axisData = this.CreateAxisData(seriesCollection);
return(this.DrawX(axisCanvas));
}
private List <double> DrawYAxisBottomToTop(Canvas axisCanvas, DateTimeAxisData axisData, double labelStepMilliseconds, double labelStepSize)
{
List <double> yList = new List <double>();
double axisHeight = axisCanvas.Height;
double bottom = ChartConstant.ZERO_D, bottom2;
DateTime time = axisData.MinValue;
double y = axisHeight;
TextBlock label;
Size labelSize = this._labelTextSize;
double heightHalf = labelSize.Height / 2;
AxisLabelLocation labelLocation = AxisLabelLocation.First;
bool addLabelControl;
double lastLabelY = axisHeight;
while (true)
{
label = ChartHelper.CreateLabelControl(this, this.CreateAxisText(time));
if (axisHeight > labelSize.Height)
{
addLabelControl = false;
switch (labelLocation)
{
case AxisLabelLocation.First:
axisCanvas.Children.Add(label);
addLabelControl = true;
Canvas.SetBottom(label, bottom);
lastLabelY = axisHeight - labelSize.Height;
labelLocation = AxisLabelLocation.Middle;
break;
case AxisLabelLocation.Middle:
bottom2 = bottom - heightHalf;
if (bottom2 > ChartConstant.ZERO_D)
{
axisCanvas.Children.Add(label);
addLabelControl = true;
Canvas.SetBottom(label, bottom2);
lastLabelY = bottom2 - labelSize.Height;
}
break;
case AxisLabelLocation.Last:
if (lastLabelY - labelSize.Height > ChartConstant.ZERO_D)
{
axisCanvas.Children.Add(label);
addLabelControl = true;
Canvas.SetTop(label, ChartConstant.ZERO_D);
}
break;
default:
throw new NotImplementedException(labelLocation.ToString());
}
if (addLabelControl)
{
if (base.IsAxisYLeft())
{
Canvas.SetLeft(label, ChartConstant.LABEL_TEXT_INTERVAL);
}
else
{
Canvas.SetRight(label, ChartConstant.LABEL_TEXT_INTERVAL);
}
}
}
if (labelLocation == AxisLabelLocation.Last)
{
if (this._showLastLabel)
{
yList.Add(y);
}
break;
}
yList.Add(y);
time = time.AddMilliseconds(labelStepMilliseconds);
if (time >= axisData.MaxValue)
{
labelStepSize = (labelStepMilliseconds - (time - axisData.MaxValue).TotalMilliseconds) * labelStepSize / labelStepMilliseconds;
double labelHeight = ChartHelper.MeasureLabelTextSize(this, axisData.MaxValue.ToString()).Height + 10d;
if (labelStepSize < labelHeight)
{
break;
}
time = axisData.MaxValue;
y = ChartConstant.ZERO_D;
labelLocation = AxisLabelLocation.Last;
}
else
{
y -= labelStepSize;
}
bottom += labelStepSize;
}
return(yList);
}
