/// <summary>
/// Generates the label of the specified <see cref="Category"/>.
/// </summary>
/// <param name="category">The specified <see cref="Category"/>.</param>
/// <returns>The generated <see cref="UIView"/> representing the label of the <see cref="Category"/>.</returns>
private static UIView GetLabel(Category category)
{
if (category == null)
{
throw new ArgumentNullException();
}
var circle = new UIButton();
circle.WidthAnchor.ConstraintEqualTo(Constants.LabelCircleRadius * 2).Active = true;
circle.HeightAnchor.ConstraintEqualTo(Constants.LabelCircleRadius * 2).Active = true;
circle.Layer.CornerRadius = Constants.LabelCircleRadius;
circle.BackgroundColor = category.Color.ToUIColor();
var text = new UILabel
{
Text = category.Label,
Font = UIFont.SystemFontOfSize(Constants.LabelFontSize),
TextColor = Constants.LabelTextColor
};
text.SizeToFit();
var stackView = DataVisualizationUtils.GenerateStackView(Constants.LabelStackViewAxis,
Constants.LabelStackViewAlignment,
Constants.LabelStackViewDistribution,
Constants.LabelStackViewSpacing,
new UIView[] { circle, text });
ConfigureBarChartLegendAccessibilityAttributes(circle, text);
return(DataVisualizationUtils.WrapStackView(stackView,
text.Frame.Width + Constants.LabelStackViewSpacing + Constants.LabelCircleRadius * 2,
Constants.LegendHeight, NSLayoutAttribute.CenterX, NSLayoutAttribute.CenterY));
}
/// <summary>
/// Generates the legend of the data visualization given the specified <see cref="Category"/>s.
/// </summary>
/// <param name="categories">The specified <see cref="Category"/>s.</param>
/// <returns>The generated <see cref="UIView"/> representing the legend.</returns>
private UIView GenerateLegend(IEnumerable <Category> categories)
{
if (categories == null)
{
throw new ArgumentNullException();
}
Labels = new Dictionary <Category, UIView>();
var categoriesList = categories.ToList();
var totalLength = (nfloat)0.0;
foreach (var category in categoriesList)
{
var label = GetLabel(category);
Labels.Add(category, label);
totalLength += label.Frame.Width;
}
var stackView = DataVisualizationUtils.GenerateStackView(Constants.LegendStackViewAxis,
Constants.LegendStackViewAlignment,
Constants.LegendStackViewDistribution,
Constants.LegendStackViewSpacing,
Labels.Select(pair => pair.Value));
totalLength += Labels.Count * Constants.LegendStackViewSpacing;
return(DataVisualizationUtils.WrapStackView(stackView, totalLength, Constants.LegendHeight,
NSLayoutAttribute.LeadingMargin, NSLayoutAttribute.CenterY));
}
protected override UIView GenerateChart(IEnumerable <Dictionary <Category, int> > allDataPoints,
IEnumerable <Category> allCategories)
{
if (allDataPoints == null || allCategories == null)
{
throw new ArgumentNullException();
}
var allDataPointsList = allDataPoints.ToList();
_input = allDataPointsList;
BarCharts = new List <BarChart>();
_enabledCategories = new HashSet <Category>();
_maxDataPoints = new Dictionary <Category, int>();
_maxDataPointSet = new SortedSet <int>();
foreach (var dataPoints in allDataPointsList)
{
var barChart = new BarChart(dataPoints, allCategories);
BarCharts.Add(barChart);
barChart.ParentBarChartSeries = this;
foreach (var categoryDataPointPair in dataPoints)
{
var category = categoryDataPointPair.Key;
var dataPoint = categoryDataPointPair.Value;
if (_maxDataPoints.ContainsKey(category))
{
_maxDataPoints[category] = Math.Max(_maxDataPoints[category], dataPoint);
}
else
{
_maxDataPoints[category] = dataPoint;
}
}
}
var stackView = DataVisualizationUtils.GenerateStackView(Constants.BarChartSeriesStackViewAxis,
Constants.BarChartSeriesStackViewAlignment,
Constants.BarChartSeriesStackViewDistribution,
Constants.BarChartSeriesStackViewSpacing,
BarCharts.Select(barChart => barChart.Chart));
var imageCount = allDataPointsList.Count();
var width = imageCount * Constants.BarChartWidth +
(imageCount - 1) * Constants.BarChartSeriesStackViewSpacing;
return(DataVisualizationUtils.WrapStackView(stackView, width, Constants.BarChartSeriesStackViewHeight,
NSLayoutAttribute.CenterX, NSLayoutAttribute.CenterY));
}