public override Axis Generate(AxisLabelerOptions options, double density)
{
var m = (((options.AxisLocation == AxisLocation.Top || options.AxisLocation == AxisLocation.Bottom) ? options.Screen.Width : options.Screen.Height) * density);
m = Math.Max(m, 2);
var v = (Numeric)options.Symbol;
//loose labeling
var vMin = v.Range.Min;
var vMax = v.Range.Max;
var range = heckbertNiceNum(vMax - vMin, false);
var d = heckbertNiceNum(range / (m - 1), true);
var rMin = Math.Floor(vMin / d) * d;
var rMax = Math.Ceiling(vMax / d) * d;
var labels = new List<AxisLabel>();
var option = options.DefaultAxis();
var currX = rMin;
while (currX <= rMax + 0.5 * d)
{
labels.Add(new AxisLabel(currX, currX.ToString(CultureInfo.InvariantCulture)));
currX += d;
}
option.VisibleRange = new Range(rMin, currX - d);
option.Labels = labels;
option.Score = 1;
return option;
}
protected double legibilityScoreMax(Axis data, AxisLabelerOptions options)
{
return (legibility_format(data, options) +
legibility_fontSize(data, options) +
legibility_orientation(data, options) +
1) / 4;
}
protected double legibility_fontSize(Axis data, AxisLabelerOptions options)
{
var fsmin = fontSizes.Min();
return (data.FontSize > options.FontSize || data.FontSize < fsmin)
? double.NegativeInfinity
: ((data.FontSize == options.FontSize)
? 1
: 0.2 * ((data.FontSize - fsmin + 1) / (options.FontSize - fsmin)));
}
public override Axis Generate(AxisLabelerOptions options, double density)
{
var f = (Factor)options.Symbol;
var labels = f.AllLevels.Select(level => new AxisLabel(level.LevelIndex, level.ToString())).ToList();
var result = options.DefaultAxis();
result.Labels = labels;
return result;
}
public override Axis Generate(AxisLabelerOptions options, double density)
{
//int nbins = 9; // in the actual Matplotlib implementation this was fixed at 9. here we let it vary like the other methods for a better comparison
var m = (((options.AxisLocation == AxisLocation.Top || options.AxisLocation == AxisLocation.Bottom) ? options.Screen.Width : options.Screen.Height) * density);
var nbins = (int)Math.Max(m, 2);
var steps = new List<double> { 1, 2, 5, 10 };
var vMin = options.DataRange.Min;
var vMax = options.DataRange.Max;
var value = matPlotLibScaleRange(vMin, vMax, nbins);
var scale = value.Item1;
var offset = value.Item2;
vMin -= offset;
vMax -= offset;
var rawStep = (vMax - vMin) / nbins;
var scaledRawStep = rawStep / scale;
var bestMax = vMax;
var bestMin = vMin;
double scaledStep = 1;
foreach (int step in steps)
{
if (step < scaledRawStep) continue;
scaledStep = step * scale;
bestMin = scaledStep * Math.Floor(vMin / scaledStep);
bestMax = bestMin + scaledStep * nbins;
if (bestMax >= vMax) break;
}
var extraBins = (int)Math.Floor((bestMax - vMax) / scaledStep);
nbins -= extraBins;
var labels = new List<AxisLabel>();
var option = options.DefaultAxis();
//compute actual labels
for (var i = 0; i <= nbins; i++)
{
var labelVal = bestMin + i * scaledStep + offset;
labels.Add(new AxisLabel(labelVal, labelVal.ToString(CultureInfo.InvariantCulture)));
}
option.Labels = labels;
option.Score = 1;
option.VisibleRange = new Range(bestMin + offset, bestMin + nbins * scaledStep + offset);
return option;
}
public AxisLayout(AxisLocation axisLocation, Vector symbol, Range dataRange, Range visibleRange, Func<string, double, Axis, AxisLabelerOptions, Rect> computeLabelRect, Rect screen)
{
_options = new AxisLabelerOptions
{
AxisLocation = axisLocation,
Symbol = symbol,
DataRange = dataRange,
VisibleRange = visibleRange,
FontSize = AxisFontSize,
ComputeLabelRect = computeLabelRect,
Screen = screen
};
}
static Axis Helper(AxisLabelerOptions options, double m, double mincoverage = 0.8)
{
var snice = double.NegativeInfinity;
var intervals = (int)Math.Max(Math.Floor(m), 2) - 1;
var v = (Numeric)options.Symbol;
var min = v.Range.Min;
var max = v.Range.Max;
var Q = new List<double> { 1.0, 10.0, 5.0, 2.0, 2.5, 3.0, 4.0, 1.5, 7.0, 6.0, 8.0, 9.0 };
var range = max - min;
var dc = range / intervals;
var dbase = Math.Pow(10, Math.Floor(Math.Log10(dc)));
Axis best = null;
foreach (var q in Q)
{
var tdelta = q * dbase;
var tmin = Math.Floor(min / tdelta) * tdelta;
var tmax = tmin + intervals * tdelta;
var i = Q.IndexOf(q);
var roundness = 1.0 - ((i + 1) - ((tmin <= 0 && tmax >= 0) ? 1.0 : 0.0)) / Q.Count();
var coverage = (max - min) / (tmax - tmin);
if (coverage <= mincoverage || tmin > min || tmax < max) continue;
var score = roundness + coverage;
if (score <= snice) continue;
var stepSequence = Enumerable.Range(0, intervals + 1).Select(x => tmin + x * tdelta).ToList();
//var newlabels = stepSequence.Select(value => Tuple.Create(value, value.ToString(CultureInfo.InvariantCulture))).ToList();
var newlabels = stepSequence.Select(value => new AxisLabel(value, value.ToString(CultureInfo.InvariantCulture))).ToList();
var candidate = options.DefaultAxis();
candidate.Score = score;
candidate.Labels = newlabels;
best = candidate;
snice = score;
}
return best;
}
public Axis Generate(AxisLabelerOptions options, double density, double mincoverage)
{
var m = (((options.AxisLocation == AxisLocation.Top || options.AxisLocation == AxisLocation.Bottom) ? options.Screen.Width : options.Screen.Height) * density);
m = Math.Max(m, 2);
Axis best = null;
for (var i = 2; i < 12; i++)
{
var b = Helper(options, i, mincoverage);
var granularity = 1 - Math.Abs(i - m) / m;
if (b == null || (best != null && b.Score + granularity <= best.Score)) continue;
best = b;
best.Score += granularity;
}
if (best != null) best.VisibleRange = new Range(Math.Min(options.VisibleRange.Min, best.Labels.Min(t => t.Value)), Math.Max(options.VisibleRange.Max, best.Labels.Max(t => t.Value)));
return best;
}
public override Axis Format(List<Axis> list, List<Format> formats, AxisLabelerOptions options, Func<Axis, double> ScoreAxis, double bestScore = double.NegativeInfinity)
{
var result = options.DefaultAxis();
foreach (var data in list)
foreach (var format in formats)
{
var f = data.Clone();
f.FormatStyle = format;
f.Legibility = legibilityScoreMax(f, options);
if (ScoreAxis(f) < bestScore) continue;
var labels = f.FormatStyle.FormalLabels(f.Labels.Select(x => (object)x.Value).ToList());
f.Labels = f.Labels.Select(x => x.Value).Zip(labels.Item1, (value, label) => new AxisLabel(value, label)).ToList();
f.AxisTitleExtension = labels.Item2;
f.Legibility = legibilityScore(f, options);
f.Score = ScoreAxis(f);
if (f.Score < bestScore) continue;
bestScore = f.Score;
result = f;
}
return result;
}
protected double legibility_overlap(Axis data, AxisLabelerOptions options)
{
// compute overlap score
var em = ems[data.FontSize];
var rects = data.Labels.Select(s => options.ComputeLabelRect(s.Label, s.Value, data, options)).ToList();
// takes adjacent pairs of rectangles
var take = rects.Take(rects.Count - 1).ToList();
var skip = rects.Skip(1).ToList();
var zip = take.Zip(skip, (a, b) =>
{
var dist = (options.AxisLocation == AxisLocation.Top || options.AxisLocation == AxisLocation.Bottom) ? b.Left - a.Right : a.Top - b.Bottom;
return Math.Min(1, 2 - (1.5 * em) / Math.Max(0, dist));
}).ToList();
var overlap = zip.Min();
#if false
var overlap = rects.Take(rects.Count - 1).Zip(rects.Skip(1),
(a, b) =>
{
var dist = (options.AxisLocation == AxisLocation.Top || options.AxisLocation == AxisLocation.Bottom) ? b.Left - a.Right : a.Top - b.Bottom;
return Math.Min(1, 2 - (1.5 * em) / Math.Max(0, dist));
}).Min();
#endif
return overlap;
}
public override Axis Generate(AxisLabelerOptions options, double density) { return Generate(options, density, 0.8); }
public abstract Axis Generate(AxisLabelerOptions labeler, double m);
public override Axis Generate(AxisLabelerOptions options, double m) { return options.DefaultAxis(); }
protected double legibility_orientation(Axis data, AxisLabelerOptions options) { return data.LabelDirection == AxisDirection.Horizontal ? 1.0 : -0.5; }
public override Axis Generate(AxisLabelerOptions options, double density)
{
var formatter = new QuantitativeFormatter(options.Typeface.FontFamily);
var space = ((options.AxisLocation == AxisLocation.Top || options.AxisLocation == AxisLocation.Bottom) ? options.Screen.Width : options.Screen.Height);
var dmax = options.DataRange.Max;
var dmin = options.DataRange.Min;
if (dmax == dmin) return null;
Axis best = null;
double bestScore = -2;
var j = 1;
while (j < int.MaxValue)
{
foreach (var q in Q)
{
var sm = max_simplicity(q, Q, j);
if (w[0] * sm + w[1] + w[2] + w[3] < bestScore)
{
j = int.MaxValue - 1;
break;
}
var k = 2;
while (k < int.MaxValue)
{
var dm = max_density(k / space, density);
if (w[0] * sm + w[1] + w[2] * dm + w[3] < bestScore) break;
var delta = (dmax - dmin) / (k + 1) / (j * q);
var z = (int)Math.Ceiling(Math.Log10(delta));
while (z < int.MaxValue)
{
var step = j * q * Math.Pow(10, z);
var cm = max_coverage(dmin, dmax, step * (k - 1));
if (w[0] * sm + w[1] * cm + w[2] * dm + w[3] < bestScore) break;
for (var start = (int)(Math.Floor(dmax / step - (k - 1)) * j); start <= (int)(Math.Ceiling(dmin / step)) * j; start++)
{
var lmin = start * step / j;
var lmax = lmin + step * (k - 1);
var s = simplicity(q, Q, j, lmin, lmax, step);
var d = this.density(k / space, density);
var c = coverage(dmin, dmax, lmin, lmax);
if (w[0] * s + w[1] * c + w[2] * d + w[3] < bestScore) continue;
var option = options.DefaultAxis();
var stepSequence = Enumerable.Range(0, k).Select(x => lmin + x * step).ToList();
var newlabels = stepSequence.Select(value => new AxisLabel(value, value.ToString(CultureInfo.InvariantCulture))).ToList();
option.Labels = newlabels;
option.Granularity = d;
option.Coverage = c;
option.Simplicity = s;
option.Score = s + c + d;
//format and choose best
var subPossibilities = new List<Axis> { option };
var optionFormatted = formatter.Format(
formatter.varyOrientation(formatter.varyFontSize(subPossibilities, options)),
formats,
options,
a => w[0] * a.Simplicity + w[1] * a.Coverage + w[2] * a.Granularity + w[3] * a.Legibility,
bestScore);
var score = w[0] * optionFormatted.Simplicity + w[1] * optionFormatted.Coverage +
w[2] * optionFormatted.Granularity + w[3] * optionFormatted.Legibility;
if (score <= bestScore) continue;
bestScore = score;
optionFormatted.Score = score;
best = optionFormatted;
}
z = z + 1;
}
k = k + 1;
}
}
j = j + 1;
}
//if (best == null) Console.WriteLine(@"WARNING: Extended algorithm found 0 solutions");
//else best.VisibleRange = new Range(Math.Min(options.VisibleRange.Min, best.Labels.Min(t => t.Value)), Math.Max(options.VisibleRange.Max, best.Labels.Max(t => t.Value)));
if (best != null) best.VisibleRange = new Range(Math.Min(options.VisibleRange.Min, best.Labels.Min(t => t.Value)), Math.Max(options.VisibleRange.Max, best.Labels.Max(t => t.Value)));
return best;
}
public DataAxis()
{
SnapsToDevicePixels = true;
UseLayoutRounding = true;
AxisTicks = new ObservableList<DataAxisTick>();
SizeChanged += (s, e) => OnSizeChanged();
_axisOptions = new AxisLabelerOptions
{
ComputeLabelRect = ComputeLabelRect,
FontSize = TextBlock.GetFontSize(this),
Typeface = new Typeface(TextBlock.GetFontFamily(this), TextBlock.GetFontStyle(this), TextBlock.GetFontWeight(this), TextBlock.GetFontStretch(this))
};
_axisLabeler = new ExtendedAxisLabeler();
SetValue(VisibleRangePropertyKey, _visibleRange);
_visibleRange.ObserveOnDispatcher().Subscribe(e =>
{
//if (_showDebugMessages) Debug.WriteLine(string.Format("{0:HH:mm:ss.fff} DataAxis: Axis \"{1}\": Updated _visbleRange to: {2}", DateTime.Now, AxisLabel, _visibleRange));
VisibleRangeChanged();
SetValue(VisibleRangePropertyKey, new Range(_visibleRange));
});
var presentationSource = PresentationSource.FromVisual(this);
if (presentationSource == null || presentationSource.CompositionTarget == null) return;
var matrix = presentationSource.CompositionTarget.TransformToDevice;
_pixelsPerInch = Math.Max(matrix.M11, matrix.M22);
}
Rect ComputeLabelRect(string label, double position, Axis axis, AxisLabelerOptions options)
{
var axisPosition = options.AxisTransform.Transform(new Point(position, MajorTickLength));
var text = new FormattedText(label, CultureInfo.CurrentCulture, FlowDirection.LeftToRight, options.Typeface, options.FontSize, Brushes.Black);
var left = axisPosition.X;
var top = axisPosition.Y;
switch (axis.AxisLocation)
{
case AxisLocation.Top:
left -= text.Width / 2;
top -= text.Height;
break;
case AxisLocation.Bottom:
left -= text.Width / 2;
break;
case AxisLocation.Left:
top -= text.Height / 2;
left -= text.Width;
break;
case AxisLocation.Right:
top -= text.Height / 2;
break;
default:
throw new ApplicationException("DataAxis: Unknown AxisLocation value.");
}
return new Rect(new Point(left, top), new Size(text.Width, text.Height));
}
public List<Axis> varyFontSize(List<Axis> list, AxisLabelerOptions options)
{
var possibilities = new List<Axis>();
// Reverse to produce the font sizes in decreasing order of goodness
foreach (var size in fontSizes.Where(s => s <= options.FontSize).Reverse())
foreach (var data in list)
{
var option = data.Clone();
option.FontSize = size;
possibilities.Add(option);
}
return possibilities;
}
protected double legibility_format(Axis data, AxisLabelerOptions options)
{
var format = data.FormatStyle.Score(data.Labels.Select(x => (object)x.Value).ToList());
return format;
}
public abstract Axis Format(List<Axis> list, List<Format> formats, AxisLabelerOptions options, Func<Axis, double> ScoreAxis, double bestScore = double.NegativeInfinity);
