// values[0] - Point CurrentMousePosition
// values[1] - double VolumeHistogramHeight
// values[2] - CandleExtremums visibleCandlesExtremums
// values[3] - double VolumeHistogramTopMargin
// values[4] - double VolumeHistogramBottomMargin
// values[5] - CultureInfo candleChartCulture
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
if (values == null || values.Length < 5 || (values[0]).GetType() != typeof(Point) || (values[1]).GetType() != typeof(double) || (values[2]).GetType() != typeof(CandleExtremums) ||
(values[3]).GetType() != typeof(double) || (values[4]).GetType() != typeof(double))
{
return(0.0);
}
Point currentMousePosition = (Point)values[0];
double volumeHistogramHeight = (double)values[1];
CandleExtremums visibleCandlesExtremums = (CandleExtremums)values[2];
double volumeHistogramTopMargin = (double)values[3];
double volumeHistogramBottomMargin = (double)values[4];
CultureInfo candleChartCulture = (CultureInfo)values[5];
string decimalSeparator = candleChartCulture.NumberFormat.NumberDecimalSeparator;
char[] decimalSeparatorArray = decimalSeparator.ToCharArray();
double volume = (((visibleCandlesExtremums.VolumeHigh - (currentMousePosition.Y - volumeHistogramTopMargin) / (volumeHistogramHeight - volumeHistogramTopMargin - volumeHistogramBottomMargin) * visibleCandlesExtremums.VolumeHigh)));
return(MyNumberFormatting.VolumeToLimitedLengthString(volume, candleChartCulture, decimalSeparator, decimalSeparatorArray));
}
//---------------------------------------------------------------------------------------------------------------------------------------
protected override void OnRender(DrawingContext drawingContext)
{
//if (VisibleCandlesExtremums.VolumeHigh == long.MinValue) return;
double textHeight = (new FormattedText("1,23", Culture, FlowDirection.LeftToRight, currentTypeFace, TickLabelFontSize, Brushes.Black, VisualTreeHelper.GetDpi(this).PixelsPerDip)).Height;
double halfTextHeight = textHeight / 2.0;
double chartPanelWidth = ActualWidth - PriceAxisWidth;
double tickLabelX = chartPanelWidth + TICK_LINE_WIDTH + TICK_LEFT_MARGIN;
double tickLineEndX = chartPanelWidth + TICK_LINE_WIDTH;
double chartHeight = ActualHeight - ChartBottomMargin - ChartTopMargin;
if (chartHeight <= 0)
{
return;
}
double stepInVolumeUnits = VisibleCandlesExtremums.VolumeHigh * ((textHeight + GapBetweenTickLabels) / chartHeight);
double stepInVolumeUnits_HPlace = MyWpfMath.HighestDecimalPlace(stepInVolumeUnits, out _);
stepInVolumeUnits = Math.Ceiling(stepInVolumeUnits / stepInVolumeUnits_HPlace) * stepInVolumeUnits_HPlace;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
double chartHeight_candlesLHRange_Ratio = chartHeight / VisibleCandlesExtremums.VolumeHigh;
string decimalSeparator = Culture.NumberFormat.NumberDecimalSeparator;
char[] decimalSeparatorArray = decimalSeparator.ToCharArray();
void DrawVolumeTick(double volume)
{
string s = MyNumberFormatting.VolumeToLimitedLengthString(volume, Culture, decimalSeparator, decimalSeparatorArray);
FormattedText priceTickFormattedText = new FormattedText(s, Culture, FlowDirection.LeftToRight, currentTypeFace, TickLabelFontSize, TickColor, VisualTreeHelper.GetDpi(this).PixelsPerDip);
double y = ChartTopMargin + (VisibleCandlesExtremums.VolumeHigh - volume) * chartHeight_candlesLHRange_Ratio;
drawingContext.DrawText(priceTickFormattedText, new Point(tickLabelX, y - halfTextHeight));
drawingContext.DrawLine(tickPen, new Point(chartPanelWidth, y), new Point(tickLineEndX, y));
if (IsGridlinesEnabled && GridlinesPen != null)
{
drawingContext.DrawLine(GridlinesPen, new Point(0, y), new Point(chartPanelWidth, y));
}
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
double theMostRoundVolume = MyWpfMath.HighestDecimalPlace(VisibleCandlesExtremums.VolumeHigh, out _);
DrawVolumeTick(theMostRoundVolume);
double maxVolumeThreshold = (VisibleCandlesExtremums.VolumeHigh + (ChartTopMargin - halfTextHeight) / chartHeight_candlesLHRange_Ratio);
double minVolumeThreshold = (VisibleCandlesExtremums.VolumeHigh + (ChartTopMargin - ActualHeight + halfTextHeight) / chartHeight_candlesLHRange_Ratio);
int step_i = 1;
double next_tick;
while ((next_tick = theMostRoundVolume + step_i * stepInVolumeUnits) < maxVolumeThreshold)
{
DrawVolumeTick(next_tick);
step_i++;
}
step_i = 1;
while ((next_tick = theMostRoundVolume - step_i * stepInVolumeUnits) > minVolumeThreshold)
{
DrawVolumeTick(next_tick);
step_i++;
}
}