public void reloadChart(object sender, EventArgs e)
{
chart.RemoveAllData ();
Random r = new Random ();
for (int i = 0; i < 3; i++) {
List<TKChartDataPoint> list = new List<TKChartDataPoint> ();
for (int j = 0; j < 8; j++) {
list.Add(new TKChartDataPoint(new NSNumber(j+1), new NSNumber(r.Next()%100)));
}
TKChartSeries series = null;
switch (this.SelectedOption)
{
case 0:
series = new TKChartLineSeries (list.ToArray ());
break;
case 1:
series = new TKChartSplineSeries (list.ToArray ());
break;
case 2:
series = new TKChartAreaSeries (list.ToArray());
break;
case 3:
series = new TKChartSplineAreaSeries (list.ToArray());
break;
}
series.SelectionMode = TKChartSeriesSelectionMode.Series;
chart.AddSeries (series);
}
}
void reloadData(object sender, EventArgs e)
{
chart.RemoveAllData();
TKChartStackInfo stackInfo = null;
if (this.SelectedOption == 0)
{
stackInfo = new TKChartStackInfo(new NSNumber(1), TKChartStackMode.Stack);
}
else if (this.SelectedOption == 1)
{
stackInfo = new TKChartStackInfo(new NSNumber(1), TKChartStackMode.Stack100);
}
Random r = new Random();
for (int i = 0; i < 3; i++)
{
List <TKChartDataPoint> list = new List <TKChartDataPoint> ();
for (int j = 0; j < 8; j++)
{
list.Add(new TKChartDataPoint(new NSNumber(j + 1), new NSNumber(r.Next() % 100)));
}
TKChartAreaSeries series = new TKChartAreaSeries(list.ToArray());
series.SelectionMode = TKChartSeriesSelectionMode.Series;
series.StackInfo = stackInfo;
chart.AddSeries(series);
}
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
TKChart chart = new TKChart(this.View.Bounds);
chart.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
this.View.AddSubview(chart);
string[] months = { "Jan", "Feb", "Mar", "Apr", "May", "Jun" };
int[] values = { 95, 40, 55, 30, 76, 34 };
List <TKChartDataPoint> array = new List <TKChartDataPoint> ();
for (int i = 0; i < months.Length; i++)
{
array.Add(new TKChartDataPoint(new NSString(months[i]), new NSNumber(values[i])));
}
TKChartAreaSeries series = new TKChartAreaSeries(array.ToArray());
series.Style.PointShape = new TKPredefinedShape(TKShapeType.Circle, new SizeF(10, 10));
chart.AddSeries(series);
TKPredefinedShape shape = new TKPredefinedShape(TKShapeType.Star, new SizeF(20, 20));
MyAnnotation a = new MyAnnotation(shape, new NSString("Mar"), new NSNumber(60), series);
a.Fill = new TKSolidFill(UIColor.Blue);
a.Stroke = new TKStroke(UIColor.Yellow, 3);
chart.AddAnnotation(a);
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
TKChart chart = new TKChart(this.View.Bounds);
chart.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
chart.Legend.Hidden = false;
this.View.AddSubview(chart);
TKDataSource datasource = new TKDataSource("electricity", ".json", "data");
datasource.SortWithKey("year", true);
datasource.ItemSource = NSArray.FromObjects(
new TKDataSourceGroup(datasource.Items, "nuclear", "year"),
new TKDataSourceGroup(datasource.Items, "hydro", "year"),
new TKDataSourceGroup(datasource.Items, "solar", "year")
);
List <UIColor> colors = new List <UIColor> {
new UIColor(0.318f, 0.384f, 0.737f, 1.00f),
new UIColor(0.039f, 0.631f, 0.933f, 1.00f),
new UIColor(0.271f, 0.678f, 0.373f, 1.00f)
};
datasource.Settings.Chart.CreateSeries((TKDataSourceGroup group) => {
TKChartAreaSeries areaSeries = new TKChartAreaSeries();
areaSeries.Title = group.ValueKey.ToUpper();
for (int i = 0; i < datasource.Items.Length; i++)
{
TKDataSourceGroup current = (TKDataSourceGroup)datasource.Items[i];
if (current.ValueKey == group.ValueKey)
{
areaSeries.Style.Fill = new TKSolidFill(colors[i]);
}
}
return(areaSeries);
});
// >> chart-axis-logarithmic-cs
TKChartLogarithmicAxis yAxis = new TKChartLogarithmicAxis();
yAxis.LogarithmBase = 2;
chart.YAxis = yAxis;
// << chart-axis-logarithmic-cs
chart.DataSource = datasource;
}
public void setupAreaSeries()
{
chart.RemoveAllData ();
Random r = new Random ();
List<TKChartDataPoint> list = new List<TKChartDataPoint> ();
for (int i = 0; i < 10; i++) {
list.Add (new TKChartDataPoint(new NSNumber(i), new NSNumber(r.Next() % 100)));
}
TKChartAreaSeries areaSeries = new TKChartAreaSeries (list.ToArray());
areaSeries.Selection = TKChartSeriesSelection.Series;
chart.AddSeries (areaSeries);
}
public void setupAreaSeries(object sender, EventArgs e)
{
chart.RemoveAllData ();
Random r = new Random ();
List<TKChartDataPoint> list = new List<TKChartDataPoint> ();
for (int i = 0; i < 10; i++) {
list.Add (new TKChartDataPoint(new NSNumber(i), new NSNumber(r.Next() % 100)));
}
TKChartAreaSeries areaSeries = new TKChartAreaSeries (list.ToArray());
areaSeries.SelectionMode = TKChartSeriesSelectionMode.Series;
chart.AddSeries (areaSeries);
}
void snippet4()
{
// >> chart-style-fill-cs
var seriesForAnnualRevenue = new TKChartAreaSeries(pointsWithCategoriesAndValues.ToArray());
seriesForAnnualRevenue.Style.Palette = new TKChartPalette();
var paletteItem = new TKChartPaletteItem();
paletteItem.Stroke = new TKStroke(UIColor.Brown);
paletteItem.Fill = new TKSolidFill(UIColor.Red);
seriesForAnnualRevenue.Style.Palette.AddPaletteItem(paletteItem);
chart.AddSeries(seriesForAnnualRevenue);
// << chart-style-fill-cs
}
public override void ViewDidLoad()
{
this.AddOption("pin at top", top);
this.AddOption("pin at left", left);
this.AddOption("pin at right", right);
this.AddOption("pin at bottom", bottom);
this.AddOption("floating", floating);
base.ViewDidLoad();
chart = new TKChart(this.View.Bounds);
chart.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
this.View.AddSubview(chart);
Random r = new Random();
List <TKChartDataPoint> list1 = new List <TKChartDataPoint> ();
List <TKChartDataPoint> list2 = new List <TKChartDataPoint> ();
for (int i = 0; i < 26; i++)
{
list1.Add(new TKChartDataPoint(new NSNumber(i + 1), new NSNumber(r.Next(100))));
list2.Add(new TKChartDataPoint(new NSNumber(i + 1), new NSNumber(r.Next(60))));
}
TKChartNumericAxis xAxis = new TKChartNumericAxis(new NSNumber(1), new NSNumber(26));
xAxis.Position = TKChartAxisPosition.Bottom;
xAxis.MajorTickInterval = 5;
chart.AddAxis(xAxis);
TKChartAreaSeries series = new TKChartAreaSeries(list1.ToArray());
series.XAxis = xAxis;
chart.AddSeries(series);
TKChartAreaSeries series1 = new TKChartAreaSeries(list2.ToArray());
series1.XAxis = xAxis;
chart.AddSeries(series1);
// >> chart-trackball-cs
chart.AllowTrackball = true;
chart.Trackball.SnapMode = TKChartTrackballSnapMode.AllClosestPoints;
// << chart-trackball-cs
chart.Delegate = chartDelegate;
chart.Trackball.Tooltip.Style.TextAlignment = UITextAlignment.Left;
}
public void reloadChart()
{
chart.RemoveAllData();
List <TKChartDataPoint> array = new List <TKChartDataPoint> ();
string[] categories = new [] { "1", "2", "3", "4", "5", "6", "7", "8", "9", "10" };
int[] values = new [] { 65, 56, 65, 38, 56, 78, 62, 89, 78, 65 };
for (int i = 0; i < categories.Length; i++)
{
if (i == 4 || i == 5)
{
array.Add(new TKChartDataPoint(new NSString(categories [i]), null));
}
else
{
array.Add(new TKChartDataPoint(new NSString(categories[i]), new NSNumber(values[i])));
}
}
TKChartLineSeries series = null;
switch (this.SelectedOption)
{
case 0:
series = new TKChartLineSeries(array.ToArray());
break;
case 1:
series = new TKChartSplineSeries(array.ToArray());
break;
case 2:
series = new TKChartAreaSeries(array.ToArray());
break;
case 3:
series = new TKChartSplineAreaSeries(array.ToArray());
break;
}
series.Selection = TKChartSeriesSelection.Series;
series.DisplayNilValuesAsGaps = true;
chart.AddSeries(series);
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
TKChart chart = new TKChart();
chart.Frame = this.View.Bounds;
chart.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
chart.Delegate = chartDelegate;
this.View.AddSubview(chart);
Random r = new Random();
List <TKChartDataPoint> list1 = new List <TKChartDataPoint> ();
List <TKChartDataPoint> list2 = new List <TKChartDataPoint> ();
for (int i = 0; i < 10; i++)
{
list1.Add(new TKChartDataPoint(new NSNumber(i), new NSNumber(r.Next() % 100)));
list2.Add(new TKChartDataPoint(new NSNumber(i), new NSNumber(r.Next() % 100)));
}
TKChartColumnSeries columnSeries = new TKChartColumnSeries(list1.ToArray());
columnSeries.SelectionMode = TKChartSeriesSelectionMode.Series;
chart.AddSeries(columnSeries);
TKChartAreaSeries areaSeries = new TKChartAreaSeries(list2.ToArray());
areaSeries.Style.PointShape = new TKPredefinedShape(TKShapeType.Star, new SizeF(20, 20));
areaSeries.Style.ShapeMode = TKChartSeriesStyleShapeMode.AlwaysShow;
areaSeries.SelectionMode = TKChartSeriesSelectionMode.Series;
chart.AddSeries(areaSeries);
// >> chart-label-style-cs
chart.YAxis.Style.LabelStyle.Font = UIFont.SystemFontOfSize(18);
chart.YAxis.Style.LabelStyle.TextColor = UIColor.Black;
// << chart-label-style-cs
// >> chart-customize-axis-cs
chart.XAxis.Style.LabelStyle.Font = UIFont.SystemFontOfSize(18);
// << chart-customize-axis-cs
chart.XAxis.Style.LabelStyle.TextColor = UIColor.Black;
chart.GridStyle.HorizontalAlternateFill = new TKSolidFill(UIColor.FromWhiteAlpha(0.9f, 0.8f));
}
void snippet3()
{
// >> chart-stack-area-100-cs
var stackInfo = new TKChartStackInfo(new NSNumber(1), TKChartStackMode.Stack100);
var seriesForIncome = new TKChartAreaSeries(pointsWithCategoriesAndValues.ToArray());
seriesForIncome.StackInfo = stackInfo;
var seriesForExpenses = new TKChartAreaSeries(pointsWithCategoriesAndValues2.ToArray());
seriesForExpenses.StackInfo = stackInfo;
chart.BeginUpdates();
chart.AddSeries(seriesForIncome);
chart.AddSeries(seriesForExpenses);
chart.EndUpdates();
// << chart-stack-area-100-cs
}
public override void ViewDidLoad()
{
base.ViewDidLoad ();
TKChart chart = new TKChart (this.ExampleBounds);
chart.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
chart.Delegate = chartDelegate;
chart.AllowAnimations = true;
this.View.AddSubview (chart);
Random r = new Random ();
List<TKChartDataPoint> list = new List<TKChartDataPoint> ();
for (int i = 0; i < 10; i++) {
list.Add (new TKChartDataPoint(new NSNumber(i), new NSNumber(r.Next() % 100)));
}
TKChartAreaSeries areaSeries = new TKChartAreaSeries (list.ToArray ());
chart.AddSeries (areaSeries);
}
public override void ViewDidLoad ()
{
this.AddOption ("pin at top", top);
this.AddOption ("pin at left", left);
this.AddOption ("pin at right", right);
this.AddOption ("pin at bottom", bottom);
this.AddOption ("floating", floating);
base.ViewDidLoad ();
chart = new TKChart (this.View.Bounds);
chart.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
this.View.AddSubview (chart);
Random r = new Random ();
List<TKChartDataPoint> list1 = new List<TKChartDataPoint> ();
List<TKChartDataPoint> list2 = new List<TKChartDataPoint> ();
for (int i = 0; i < 26; i++) {
list1.Add (new TKChartDataPoint(new NSNumber(i+1), new NSNumber(r.Next(100))));
list2.Add (new TKChartDataPoint (new NSNumber (i + 1), new NSNumber (r.Next (60))));
}
TKChartNumericAxis xAxis = new TKChartNumericAxis(new NSNumber (1), new NSNumber (26));
xAxis.Position = TKChartAxisPosition.Bottom;
xAxis.MajorTickInterval = 5;
chart.AddAxis (xAxis);
TKChartAreaSeries series = new TKChartAreaSeries (list1.ToArray());
series.XAxis = xAxis;
chart.AddSeries (series);
TKChartAreaSeries series1 = new TKChartAreaSeries (list2.ToArray());
series1.XAxis = xAxis;
chart.AddSeries (series1);
chart.AllowTrackball = true;
chart.Trackball.SnapMode = TKChartTrackballSnapMode.AllClosestPoints;
chart.Delegate = chartDelegate;
chart.Trackball.Tooltip.Style.TextAlignment = UITextAlignment.Left;
}
public override void ViewDidLoad ()
{
base.ViewDidLoad ();
TKChart chart = new TKChart (this.View.Bounds);
chart.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
chart.Legend.Hidden = false;
this.View.AddSubview (chart);
TKDataSource datasource = new TKDataSource ("electricity", ".json", "data");
datasource.SortWithKey ("year", true);
datasource.ItemSource = NSArray.FromObjects(
new TKDataSourceGroup (datasource.Items, "nuclear", "year"),
new TKDataSourceGroup (datasource.Items, "hydro", "year"),
new TKDataSourceGroup (datasource.Items, "solar", "year")
);
List<UIColor> colors = new List<UIColor> {
new UIColor(0.318f, 0.384f,0.737f,1.00f),
new UIColor(0.039f, 0.631f,0.933f,1.00f),
new UIColor(0.271f, 0.678f,0.373f,1.00f)
};
datasource.Settings.Chart.CreateSeries((TKDataSourceGroup group) => {
TKChartAreaSeries areaSeries = new TKChartAreaSeries();
areaSeries.Title = group.ValueKey.ToUpper();
for (int i = 0; i < datasource.Items.Length; i++) {
TKDataSourceGroup current = (TKDataSourceGroup)datasource.Items[i];
if (current.ValueKey == group.ValueKey){
areaSeries.Style.Fill = new TKSolidFill(colors[i]);
}
}
return areaSeries;
});
chart.YAxis = new TKChartLogarithmicAxis();
chart.DataSource = datasource;
}
public void ReloadChart()
{
chart.RemoveAllData();
Random r = new Random();
for (int i = 0; i < 3; i++)
{
List <TKChartDataPoint> list = new List <TKChartDataPoint> ();
for (int j = 0; j < 8; j++)
{
list.Add(new TKChartDataPoint(new NSNumber(j + 1), new NSNumber(r.Next() % 100)));
}
TKChartSeries series = null;
switch (this.SelectedOption)
{
case 0:
series = new TKChartLineSeries(list.ToArray());
break;
case 1:
series = new TKChartSplineSeries(list.ToArray());
break;
case 2:
series = new TKChartAreaSeries(list.ToArray());
break;
case 3:
series = new TKChartSplineAreaSeries(list.ToArray());
break;
}
chart.AddSeries(series);
// >> chart-selection-cs
series.Selection = TKChartSeriesSelection.Series;
// << chart-selection-cs
}
}
public void reloadChart(object sender, EventArgs e)
{
chart.RemoveAllData ();
List<TKChartDataPoint> array = new List<TKChartDataPoint> ();
string[] categories = new []{ "1", "2", "3", "4", "5", "6", "7", "8", "9", "10" };
int[] values = new []{ 65, 56, 65, 38, 56, 78, 62, 89, 78, 65 };
for ( int i = 0; i<categories.Length; i++ ) {
if (i == 4 || i == 5) {
array.Add (new TKChartDataPoint (new NSString (categories [i]), null));
}
else {
array.Add(new TKChartDataPoint(new NSString(categories[i]), new NSNumber(values[i])));
}
}
TKChartLineSeries series = null;
switch (this.SelectedOption)
{
case 0:
series = new TKChartLineSeries (array.ToArray ());
break;
case 1:
series = new TKChartSplineSeries (array.ToArray ());
break;
case 2:
series = new TKChartAreaSeries (array.ToArray());
break;
case 3:
series = new TKChartSplineAreaSeries (array.ToArray());
break;
}
series.SelectionMode = TKChartSeriesSelectionMode.Series;
series.DisplayNilValuesAsGaps = true;
chart.AddSeries (series);
}
public void reloadChart(object sender, EventArgs e)
{
chart.RemoveAllData();
Random r = new Random();
for (int i = 0; i < 3; i++)
{
List <TKChartDataPoint> list = new List <TKChartDataPoint> ();
for (int j = 0; j < 8; j++)
{
list.Add(new TKChartDataPoint(new NSNumber(j + 1), new NSNumber(r.Next() % 100)));
}
TKChartSeries series = null;
switch (this.SelectedOption)
{
case 0:
series = new TKChartLineSeries(list.ToArray());
break;
case 1:
series = new TKChartSplineSeries(list.ToArray());
break;
case 2:
series = new TKChartAreaSeries(list.ToArray());
break;
case 3:
series = new TKChartSplineAreaSeries(list.ToArray());
break;
}
series.SelectionMode = TKChartSeriesSelectionMode.Series;
chart.AddSeries(series);
}
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
TKChart chart = new TKChart(this.ExampleBounds);
chart.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
chart.Delegate = new ChartDelegate();
chart.AllowAnimations = true;
this.View.AddSubview(chart);
Random r = new Random();
List <TKChartDataPoint> list = new List <TKChartDataPoint> ();
for (int i = 0; i < 10; i++)
{
list.Add(new TKChartDataPoint(new NSNumber(i), new NSNumber(r.Next() % 100)));
}
TKChartAreaSeries areaSeries = new TKChartAreaSeries(list.ToArray());
chart.AddSeries(areaSeries);
}
void reloadData(object sender, EventArgs e)
{
chart.RemoveAllData ();
TKChartStackInfo stackInfo = null;
if (this.SelectedOption == 0)
stackInfo = new TKChartStackInfo (new NSNumber (1), TKChartStackMode.Stack);
else if (this.SelectedOption == 1)
stackInfo = new TKChartStackInfo (new NSNumber (1), TKChartStackMode.Stack100);
Random r = new Random ();
for (int i = 0; i < 3; i++) {
List<TKChartDataPoint> list = new List<TKChartDataPoint> ();
for (int j = 0; j < 8; j++) {
list.Add(new TKChartDataPoint(new NSNumber(j+1), new NSNumber(r.Next() % 100)));
}
TKChartAreaSeries series = new TKChartAreaSeries (list.ToArray());
series.SelectionMode = TKChartSeriesSelectionMode.Series;
series.StackInfo = stackInfo;
chart.AddSeries (series);
}
}
void reloadData()
{
chart.RemoveAllData();
TKChartStackInfo stackInfo = null;
if (this.SelectedOption == 0)
{
// >> chart-stack-area-cs
stackInfo = new TKChartStackInfo(new NSNumber(1), TKChartStackMode.Stack);
}
// << chart-stack-area-cs
else if (this.SelectedOption == 1)
{
// >> chart-stack-area-100-cs
stackInfo = new TKChartStackInfo(new NSNumber(1), TKChartStackMode.Stack100);
}
// << chart-stack-area-100-cs
// >> chart-stack-area-cs
Random r = new Random();
for (int i = 0; i < 3; i++)
{
List <TKChartDataPoint> list = new List <TKChartDataPoint> ();
for (int j = 0; j < 8; j++)
{
list.Add(new TKChartDataPoint(new NSNumber(j + 1), new NSNumber(r.Next() % 100)));
}
TKChartAreaSeries series = new TKChartAreaSeries(list.ToArray());
series.Selection = TKChartSeriesSelection.Series;
series.StackInfo = stackInfo;
chart.AddSeries(series);
}
// << chart-stack-area-cs
}
public override void ViewDidLoad()
{
base.ViewDidLoad ();
TKChart chart = new TKChart ();
chart.Frame = this.ExampleBounds;
chart.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
chart.Delegate = new ChartDelegate ();
this.View.AddSubview (chart);
Random r = new Random ();
List<TKChartDataPoint> list1 = new List<TKChartDataPoint> ();
List<TKChartDataPoint> list2 = new List<TKChartDataPoint> ();
for (int i = 0; i < 10; i++) {
list1.Add (new TKChartDataPoint(new NSNumber(i), new NSNumber(r.Next() % 100)));
list2.Add (new TKChartDataPoint(new NSNumber(i), new NSNumber(r.Next() % 100)));
}
TKChartColumnSeries columnSeries = new TKChartColumnSeries (list1.ToArray());
columnSeries.SelectionMode = TKChartSeriesSelectionMode.Series;
chart.AddSeries (columnSeries);
TKChartAreaSeries areaSeries = new TKChartAreaSeries (list2.ToArray());
areaSeries.Style.PointShape = new TKPredefinedShape (TKShapeType.Star, new SizeF(20, 20));
areaSeries.Style.ShapeMode = TKChartSeriesStyleShapeMode.AlwaysShow;
areaSeries.SelectionMode = TKChartSeriesSelectionMode.Series;
chart.AddSeries (areaSeries);
chart.YAxis.Style.LabelStyle.Font = UIFont.SystemFontOfSize (18);
chart.YAxis.Style.LabelStyle.TextColor = UIColor.Black;
chart.XAxis.Style.LabelStyle.Font = UIFont.SystemFontOfSize (18);
chart.XAxis.Style.LabelStyle.TextColor = UIColor.Black;
chart.GridStyle.HorizontalAlternateFill = new TKSolidFill (UIColor.FromWhiteAlpha (0.9f, 0.8f));
}
public override void ViewDidLoad ()
{
base.ViewDidLoad ();
TKChart chart = new TKChart (this.View.Bounds);
chart.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
this.View.AddSubview (chart);
string[] months = { "Jan", "Feb", "Mar", "Apr", "May", "Jun" };
int[] values = { 95, 40, 55, 30, 76, 34 };
List<TKChartDataPoint> array = new List<TKChartDataPoint> ();
for (int i = 0; i < months.Length; i++) {
array.Add (new TKChartDataPoint(new NSString(months[i]), new NSNumber(values[i])));
}
TKChartAreaSeries series = new TKChartAreaSeries (array.ToArray());
series.Style.PointShape = new TKPredefinedShape (TKShapeType.Circle, new SizeF (10, 10));
chart.AddSeries (series);
TKPredefinedShape shape = new TKPredefinedShape (TKShapeType.Star, new SizeF (20, 20));
MyAnnotation a = new MyAnnotation (shape, new NSString ("Mar"), new NSNumber (60), series);
a.Fill = new TKSolidFill (UIColor.Blue);
a.Stroke = new TKStroke (UIColor.Yellow, 3);
chart.AddAnnotation (a);
}
