/// <summary>
/// Grid coordinates:
/// x: "normalized" [0..1] and scaled to the area-width
/// y: "axis" scale
/// </summary>
/// <param name="icrc"></param>
void IRequireRender.Render(IChartRenderContext icrc)
{
if (ValueAxis == null)
{
return;
}
if (double.IsNaN(ValueAxis.Maximum) || double.IsNaN(ValueAxis.Minimum))
{
return;
}
// grid lines
var tc = new TickCalculator(ValueAxis.Minimum, ValueAxis.Maximum);
var recycler = new Recycler <Path, ItemState>(GridLines.Where(tl => tl.Element != null).Select(tl => tl.Element), (ist) => {
return(CreateElement(ist));
});
var mrecycler = new Recycler <Path, ItemState>(MinorGridLines.Where(tl => tl.Element != null).Select(tl => tl.Element), (ist) => {
return(CreateSubElement(ist));
});
var itemstate = new List <ItemState>();
var mitemstate = new List <ItemState>();
//_trace.Verbose($"grid range:{tc.Range} tintv:{tc.TickInterval}");
var tixarray = tc.GetTicks().ToArray();
var sc = new ValueAxisSelectorContext(ValueAxis, icrc.SeriesArea, tixarray, tc.TickInterval);
for (int ix = 0; ix < tixarray.Length; ix++)
{
var tick = tixarray[ix];
//_trace.Verbose($"grid vx:{tick}");
var state = new ItemState()
{
Tick = tick
};
var current = recycler.Next(state);
if (!current.Item1)
{
// restore binding
if (PathStyle != null)
{
BindTo(this, nameof(PathStyle), current.Item2, FrameworkElement.StyleProperty);
}
}
state.Element = current.Item2;
ApplyBinding(this, nameof(Visibility), state.Element, UIElement.VisibilityProperty);
if (PathFormatter != null)
{
sc.SetTick(ix);
// call for Style, String override
var format = PathFormatter.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;
}
}
}
state.SetLocation(icrc.Area.Left, tick.Value);
sc.Generated(tick);
itemstate.Add(state);
if (MinorGridLineCount != 0)
{
// lay out minor divisions
var mintv = tc.TickInterval / (double)(MinorGridLineCount + 1);
var diry = Math.Sign(tick.Index);
if (diry == 0)
{
// special case: zero
for (int mx = 1; mx <= MinorGridLineCount; mx++)
{
var mtick = new SubtickState(tick.Index, mx, tick.Value + (double)mx * mintv);
var mstate = CreateSubtick(icrc, mrecycler, mtick);
if (mstate != null)
{
mitemstate.Add(mstate);
}
var mtick2 = new SubtickState(tick.Index, -mx, tick.Value + (double)(-mx) * mintv);
var mstate2 = CreateSubtick(icrc, mrecycler, mtick2);
if (mstate2 != null)
{
mitemstate.Add(mstate2);
}
}
}
else
{
for (int mx = 1; mx <= MinorGridLineCount; mx++)
{
var mtick = new SubtickState(tick.Index, diry * mx, tick.Value + (double)(diry * mx) * mintv);
var mstate = CreateSubtick(icrc, mrecycler, mtick);
if (mstate != null)
{
mitemstate.Add(mstate);
}
}
}
}
}
// VT and internal bookkeeping
MinorGridLines = mitemstate;
GridLines = itemstate;
Layer.Remove(mrecycler.Unused);
Layer.Remove(recycler.Unused);
Layer.Add(recycler.Created);
Layer.Add(mrecycler.Created);
Dirty = false;
}
ItemState CreateSubtick(IChartRenderContext icrc, Recycler <Path, ItemState> recycler, SubtickState tick)
{
if (tick.Value <= ValueAxis.Minimum || tick.Value >= ValueAxis.Maximum)
{
return(null);
}
var state = new ItemState()
{
Tick = tick
};
var current = recycler.Next(state);
if (!current.Item1)
{
// restore binding
if (MinorGridPathStyle != null)
{
BindTo(this, nameof(MinorGridPathStyle), current.Item2, FrameworkElement.StyleProperty);
TransferFromStyle(current.Item2, MinorGridPathStyle);
}
else if (PathStyle != null)
{
BindTo(this, nameof(PathStyle), current.Item2, FrameworkElement.StyleProperty);
TransferFromStyle(current.Item2, PathStyle);
}
}
state.Element = current.Item2;
ApplyBinding(this, nameof(Visibility), state.Element, UIElement.VisibilityProperty);
state.SetLocation(icrc.Area.Left, tick.Value);
return(state);
}