Il n'a pas été clair dans la question de savoir comment les répertoires affecteraient l'affichage des données de sorte que, en supposant que seulement deux barres sont nécessaires (1 pour chacune des 2 dates), voici un exemple. En utilisant AxisType.Date = DateAsOrdinal et ajoutez des valeurs de zéro pour les dates où les données sont nulles ou [2] en utilisant AxisType.Date = Date et n'ajoutez pas de valeurs pour dates où les données sont nulles DateAsOrdinal semble appliquer des données à la mauvaise date s'il y a des données nulles - ce qui semble être un bug ou au moins non intuitif. L'exemple utilise l'approche AxisType.Date = Date qui nécessitait un formatage supplémentaire de l'axe des dates.
using ZedGraph;
...
GraphPane myPane = zg1.GraphPane; // zg1 is a ZedGraph control.
// Set the title and axis label
myPane.Title.Text = "Stacked Bar, ZedGraph ver 5.1.5.28844";
myPane.YAxis.Title.Text = "Value";
// Create two dates.
XDate date1 = new XDate(2010, 11, 28); // First date.
XDate date2 = new XDate(2010, 11, 29); // Second date.
// Create data lists and bars for A, B, C, Back, Body and Arm (6 total).
ZedGraph.PointPairList listA = new ZedGraph.PointPairList();
listA.Add(date1, 12);
listA.Add(date2, 13);
BarItem barA = zg1.GraphPane.AddBar("A", listA, Color.Red);
barA.Bar.Fill = new Fill(Color.Red);
ZedGraph.PointPairList listB = new ZedGraph.PointPairList();
listB.Add(date1, 12);
listB.Add(date2, 12);
BarItem barB = zg1.GraphPane.AddBar("B", listB, Color.Blue);
barB.Bar.Fill = new Fill(Color.Blue);
ZedGraph.PointPairList listC = new ZedGraph.PointPairList();
listC.Add(date1, 13);
listC.Add(date2, 12);
BarItem barC = zg1.GraphPane.AddBar("C", listC, Color.Green);
barC.Bar.Fill = new Fill(Color.Green);
ZedGraph.PointPairList listBack = new ZedGraph.PointPairList();
listBack.Add(date1, 122);
listBack.Add(date2, 122);
BarItem barBack = zg1.GraphPane.AddBar("Back", listBack, Color.Red);
barBack.Bar.Fill = new Fill(Color.Red, Color.White, Color.Red);
ZedGraph.PointPairList listBody = new ZedGraph.PointPairList();
listBody.Add(date1, 112);
listBody.Add(date2, 112);
BarItem barBody = zg1.GraphPane.AddBar("Body", listBody, Color.Blue);
barBody.Bar.Fill = new Fill(Color.Blue, Color.White, Color.Blue);
ZedGraph.PointPairList listArm = new ZedGraph.PointPairList();
// listArm.Add(date1, 0); // Not needed for XAxis.Type = AxisType.Date.
listArm.Add(date2, 20);
BarItem barArm = zg1.GraphPane.AddBar("Arm", listArm, Color.Green);
barArm.Bar.Fill = new Fill(Color.Green, Color.White, Color.Green);
// Done creating bars.
myPane.BarSettings.Type = BarType.Stack; // stacks bar rather than side-by-side.
myPane.BarSettings.ClusterScaleWidth = 1; // Widen bars somewhat.
// Format the X axis.
XAxis x = myPane.XAxis;
x.Type = AxisType.Date;
x.Scale.Format = "yyyy-mm-dd";
x.Scale.BaseTic = date1; // Puts the first major tic at the first date.
x.Scale.Min = date1 - 0.5; // Manually set the left of the graph window just prior to the first date.
x.Scale.Max = date2 + 0.5; // Manually set the right of the graph window just after the last date.
// Setting the step size...
// Isn't required if AxisType.Date is DateAsOrdinal.
// Docs says that MinorStep is ignore for AxisType.Date but seems inaccurate.
// Step value of 24 was derived by trial and error. Seems it should be 1 if Unit = DateUnit.Day.
// A value of 24 implies that the Units are acting like DateUnit.Hour.
x.Scale.MajorUnit = DateUnit.Day;
x.Scale.MinorUnit = DateUnit.Day;
x.Scale.MinorStep = 24;
x.Scale.MajorStep = 24;
zg1.AxisChange(); // Update graph.