private void RecalculatePositionsAutomaticDatetime(PlotDimensions dims, float labelWidth, float labelHeight, int?forcedTickCount)
{
double low, high;
int tickCount;
if (MinimumTickSpacing > 0)
{
throw new InvalidOperationException("minimum tick spacing does not support DateTime ticks");
}
if (Orientation == AxisOrientation.Vertical)
{
low = dims.YMin - dims.UnitsPerPxY; // add an extra pixel to capture the edge tick
high = dims.YMax + dims.UnitsPerPxY; // add an extra pixel to capture the edge tick
tickCount = (int)(dims.DataHeight / labelHeight * TickDensity);
tickCount = forcedTickCount ?? tickCount;
}
else
{
low = dims.XMin - dims.UnitsPerPxX; // add an extra pixel to capture the edge tick
high = dims.XMax + dims.UnitsPerPxX; // add an extra pixel to capture the edge tick
tickCount = (int)(dims.DataWidth / labelWidth * TickDensity);
tickCount = forcedTickCount ?? tickCount;
}
if (low < high)
{
low = Math.Max(low, new DateTime(0100, 1, 1, 0, 0, 0).ToOADate()); // minimum OADate value
high = Math.Min(high, DateTime.MaxValue.ToOADate());
var dtManualUnits = (Orientation == AxisOrientation.Vertical) ? manualDateTimeSpacingUnitY : manualDateTimeSpacingUnitX;
var dtManualSpacing = (Orientation == AxisOrientation.Vertical) ? manualSpacingY : manualSpacingX;
try
{
DateTime from = DateTime.FromOADate(low);
DateTime to = DateTime.FromOADate(high);
var unitFactory = new DateTimeUnitFactory();
IDateTimeUnit tickUnit = unitFactory.CreateUnit(from, to, Culture, tickCount, dtManualUnits, (int)dtManualSpacing);
(tickPositionsMajor, tickLabels) = tickUnit.GetTicksAndLabels(from, to, dateTimeFormatString);
tickLabels = tickLabels.Select(x => x.Trim()).ToArray();
}
catch
{
tickPositionsMajor = new double[] { }; // far zoom out can produce FromOADate() exception
}
}
else
{
tickPositionsMajor = new double[] { };
}
// dont forget to set all the things
tickPositionsMinor = null;
CornerLabel = null;
}
private void RecalculatePositionsAutomaticDatetime(Settings settings)
{
// the goal of this function is to set tickPositionsMajor, tickLabels, tickPositionsMinor, cornerLabel, and maxLabelSize
double low, high;
int tickCount;
// predict maxLabelSize up front using predetermined label sizes
maxLabelSize = Drawing.GDI.MeasureString(settings.gfxData, "2019-08-20\n8:42:17 PM", settings.ticks.font);
if (verticalAxis)
{
low = settings.axes.y.min - settings.yAxisUnitsPerPixel; // add an extra pixel to capture the edge tick
high = settings.axes.y.max + settings.yAxisUnitsPerPixel; // add an extra pixel to capture the edge tick
tickCount = (int)(settings.dataSize.Height / maxLabelSize.Height);
}
else
{
low = settings.axes.x.min - settings.xAxisUnitsPerPixel; // add an extra pixel to capture the edge tick
high = settings.axes.x.max + settings.xAxisUnitsPerPixel; // add an extra pixel to capture the edge tick
tickCount = (int)(settings.dataSize.Width / maxLabelSize.Width);
}
if (low < high)
{
low = Math.Max(low, DateTime.MinValue.ToOADate());
high = Math.Min(high, DateTime.MaxValue.ToOADate());
var dtManualUnits = (verticalAxis) ? settings.ticks.manualDateTimeSpacingUnitY : settings.ticks.manualDateTimeSpacingUnitX;
var dtManualSpacing = (verticalAxis) ? settings.ticks.manualSpacingY : settings.ticks.manualSpacingX;
try
{
DateTime from = DateTime.FromOADate(low);
DateTime to = DateTime.FromOADate(high);
var unitFactory = new DateTimeUnitFactory();
IDateTimeUnit tickUnit = unitFactory.CreateUnit(from, to, settings.culture, tickCount, dtManualUnits, (int)dtManualSpacing);
(tickPositionsMajor, tickLabels) = tickUnit.GetTicksAndLabels(from, to, dateTimeFormatString);
}
catch
{
tickPositionsMajor = new double[] { }; // far zoom out can produce FromOADate() exception
}
}
else
{
tickPositionsMajor = new double[] { };
}
// dont forget to set all the things
tickPositionsMinor = null;
cornerLabel = null;
maxLabelSize = LargestLabel(settings, tickLabels);
}