// 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++; } }