private void BuildTickMarks()
{
double tickSize = 10;
double tickXPos = ComputeTickXPos(1, tickSize);
double tickYPos = ComputeTickYPos(1, tickSize);
double tickRayAngle = ComputeRayAngle(1) * (180.0 / Math.PI);
double tickLabelPadding = 25;
CircleTickMarkViewModel startTick = new CircleTickMarkViewModel(tickXPos,
tickYPos, 1, tickSize);
CircleTickLabelViewModel startTickLabel = new CircleTickLabelViewModel(tickXPos,
tickYPos, tickLabelPadding, tickRayAngle, 1);
TickMarks.Add(startTick);
TickLabels.Add(startTickLabel);
int tickIncrement = ComputeTickIncrement();
int currentTickIndex = tickIncrement;
do
{
tickXPos = ComputeTickXPos(currentTickIndex, tickSize);
tickYPos = ComputeTickYPos(currentTickIndex, tickSize);
tickRayAngle = ComputeRayAngle(currentTickIndex) * (180.0 / Math.PI);
CircleTickMarkViewModel tick = new CircleTickMarkViewModel(tickXPos,
tickYPos, currentTickIndex, 10);
CircleTickLabelViewModel label = new CircleTickLabelViewModel(tickXPos,
tickYPos, tickLabelPadding, tickRayAngle, currentTickIndex);
TickMarks.Add(tick);
TickLabels.Add(label);
currentTickIndex += tickIncrement;
} while (currentTickIndex <= _sequence.RawData.Count);
}
protected override void OnRender(DrawingContext dc)
{
base.OnRender(dc);
var height = base.ActualHeight - ReservedSpace;
var tickRange = Maximum - Minimum;
var tickCount = (int)(tickRange / TickFrequency) + 1;
var labels = TickLabels.Split(',');
if (labels.Length != tickCount)
{
return;
}
FontFamily fontFamily = new FontFamily("Segoe UI");
var fontPointSize = FontSize;
var fontHeight = Math.Ceiling(fontPointSize * fontFamily.LineSpacing);
var typeface = new Typeface("Segoe");
var cultureInfo = CultureInfo.GetCultureInfo(Language.IetfLanguageTag);
var verticalOffset = ReservedSpace / 2 - fontHeight / 2;
var tickSpacing = height * this.TickFrequency / tickRange;
dc.PushOpacity(TickLabelsOpacity);
for (var i = 0; i < tickCount; ++i)
{
var formattedText = new FormattedText(labels[i], cultureInfo, FlowDirection.LeftToRight, typeface, fontPointSize, Fill);
formattedText.TextAlignment = TextAlignment.Right;
var y = verticalOffset + height - (i * tickSpacing);
dc.DrawText(formattedText, new Point(TickLabelsOffset, y));
}
dc.Pop();
}
void DoTickLabels(IChartRenderContext icrc)
{
var tc = new TickCalculator(Minimum, Maximum);
_trace.Verbose($"grid range:{tc.Range} tintv:{tc.TickInterval}");
// TODO may want to include the LabelStyle's padding if defined
var padding = AxisLineThickness + 2 * AxisMargin;
var tbr = new Recycler <FrameworkElement, ItemState>(TickLabels.Select(tl => tl.tb), (ist) => {
var fe = CreateElement(ist);
fe.Width = icrc.Area.Width - padding;
if (fe is TextBlock tbb)
{
tbb.Padding = Side == Side.Right ? new Thickness(padding, 0, 0, 0) : new Thickness(0, 0, padding, 0);
}
return(fe);
});
var itemstate = new List <ItemState>();
// materialize the ticks
var lx = tc.GetTicks().ToArray();
var sc = new ValueAxisSelectorContext(this, icrc.Area, lx, tc.TickInterval);
for (int ix = 0; ix < lx.Length; ix++)
{
//_trace.Verbose($"grid vx:{tick}");
sc.SetTick(ix);
var createit = true;
if (LabelSelector != null)
{
// ask the label selector
var ox = LabelSelector.Convert(sc, typeof(bool), null, System.Globalization.CultureInfo.CurrentUICulture.Name);
if (ox is bool bx)
{
createit = bx;
}
else
{
createit = ox != null;
}
}
if (!createit)
{
continue;
}
var current = tbr.Next(null);
var tick = lx[ix];
if (!current.Item1)
{
// restore binding if we are using a LabelFormatter
if (LabelFormatter != null && LabelStyle != null)
{
BindTo(this, nameof(LabelStyle), current.Item2, FrameworkElement.StyleProperty);
}
}
// default text
var text = tick.Value.ToString(String.IsNullOrEmpty(LabelFormatString) ? "G" : LabelFormatString);
if (LabelFormatter != null)
{
// call for Style, String override
var format = LabelFormatter.Convert(sc, typeof(Tuple <Style, String>), null, System.Globalization.CultureInfo.CurrentUICulture.Name);
if (format is Tuple <Style, String> ovx)
{
if (ovx.Item1 != null)
{
current.Item2.Style = ovx.Item1;
}
if (ovx.Item2 != null)
{
text = ovx.Item2;
}
}
}
var shim = new TextShim()
{
Text = text
};
current.Item2.DataContext = shim;
BindTo(shim, nameof(Visibility), current.Item2, UIElement.VisibilityProperty);
var state = new ItemState()
{
tb = current.Item2, tick = tick
};
state.SetLocation(icrc.Area.Left, tick.Value);
sc.Generated(tick);
itemstate.Add(state);
}
// VT and internal bookkeeping
TickLabels = itemstate;
Layer.Remove(tbr.Unused);
Layer.Add(tbr.Created);
foreach (var xx in TickLabels)
{
// force it to measure; needed for Transforms
xx.tb.Measure(icrc.Dimensions);
}
}
