/// <summary>
/// Stack the histogram to another HistogramPlot.
/// </summary>
public void StackedTo(HistogramPlot hp)
{
SequenceAdapter data = new SequenceAdapter(DataSource, DataMember, OrdinateData, AbscissaData);
SequenceAdapter hpData = new SequenceAdapter(hp.DataSource, hp.DataMember, hp.OrdinateData, hp.AbscissaData);
if (hp != null)
{
IsStacked = true;
if (hpData.Count != data.Count)
{
throw new XwPlotException("Can stack HistogramPlot data only with the same number of datapoints");
}
for (int i = 0; i < data.Count; ++i)
{
if (data[i].X != hpData[i].X)
{
throw new XwPlotException("Can stack HistogramPlot data only with the same X coordinates");
}
if (hpData[i].Y < 0.0)
{
throw new XwPlotException("Can stack HistogramPlot data only with positive Y coordinates");
}
}
}
stackedTo = hp;
}
public HistogramSample()
: base()
{
infoText = "";
infoText += "Gaussian Example. Demonstrates - \n";
infoText += " * HistogramPlot and LinePlot" ;
plotCanvas.Clear();
System.Random r = new Random ();
int len = 35;
double[] a = new double [len];
double[] b = new double [len];
for (int i=0; i<len; ++i) {
a[i] = Math.Exp (-(double)(i-len/2)*(double)(i-len/2)/50.0);
b[i] = a[i] + (r.Next(10)/50.0f)-0.05f;
if (b[i] < 0) {
b[i] = 0;
}
}
HistogramPlot sp = new HistogramPlot ();
sp.DataSource = b;
sp.BorderColor = Colors.DarkBlue;
sp.Filled = true;
sp.FillColor = Colors.Gold; //Gradient (Colors.Lavender, Color.Gold );
sp.BaseWidth = 0.5;
sp.Label = "Random Data";
LinePlot lp = new LinePlot ();
lp.DataSource = a;
lp.LineColor = Colors.Blue;
lp.LineWidth = 3;
lp.Label = "Gaussian Function";
plotCanvas.Add (sp);
plotCanvas.Add (lp);
plotCanvas.Legend = new Legend ();
plotCanvas.YAxis1.WorldMin = 0.0;
plotCanvas.Title = "Histogram Plot";
PackStart (plotCanvas.Canvas, true);
Label la = new Label (infoText);
PackStart (la);
}
/// <summary>
/// Returns a y-axis that is suitable for drawing this plot.
/// </summary>
/// <returns>A suitable y-axis.</returns>
public Axis SuggestYAxis()
{
if (IsStacked)
{
double tmpMax = 0.0f;
ArrayList adapterList = new ArrayList();
HistogramPlot currentPlot = this;
do
{
adapterList.Add(new SequenceAdapter(
currentPlot.DataSource,
currentPlot.DataMember,
currentPlot.OrdinateData,
currentPlot.AbscissaData)
);
} while ((currentPlot = currentPlot.stackedTo) != null);
SequenceAdapter[] adapters = (SequenceAdapter[])adapterList.ToArray(typeof(SequenceAdapter));
for (int i = 0; i < adapters[0].Count; ++i)
{
double tmpHeight = 0.0f;
for (int j = 0; j < adapters.Length; ++j)
{
tmpHeight += adapters[j][i].Y;
}
tmpMax = Math.Max(tmpMax, tmpHeight);
}
Axis a = new LinearAxis(0.0, tmpMax);
// TODO make 0.08 a parameter.
a.IncreaseRange(0.08);
return(a);
}
else
{
SequenceAdapter data = new SequenceAdapter(DataSource, DataMember, OrdinateData, AbscissaData);
return(data.SuggestYAxis());
}
}
public StackedHistogram()
{
infoText = "";
infoText += "Stacked Histogram Sample. Also demonstrates - \n";
infoText += " * Label Axis with angled text. \n";
infoText += " * ColorGradient Bars fill";
plotCanvas.Clear();
Grid myGrid = new Grid();
myGrid.VerticalGridType = Grid.GridType.Coarse;
double[] pattern = {1.0, 2.0};
myGrid.MajorGridDash = pattern;
myGrid.MajorGridColor = Colors.LightGray;
plotCanvas.Add (myGrid);
// set up Histogram dataSets manually
double[] xs = {20.0, 31.0, 27.0, 38.0, 24.0, 3.0, 2.0};
double[] xs2 = {7.0, 10.0, 42.0, 9.0, 2.0, 79.0, 70.0};
double[] xs3 = {1.0, 20.0, 20.0, 25.0, 10.0, 30.0, 30.0};
HistogramPlot hp1 = new HistogramPlot ();
hp1.DataSource = xs;
hp1.BaseWidth = 0.6;
hp1.FillGradient = new ColorGradient (Colors.LightGreen, Colors.White);
hp1.Filled = true;
hp1.Label = "Developer Work";
HistogramPlot hp2 = new HistogramPlot ();
hp2.DataSource = xs2;
hp2.Label = "Web Browsing";
hp2.FillGradient = new ColorGradient (Colors.LightBlue, Colors.White);
hp2.Filled = true;
hp2.StackedTo (hp1);
HistogramPlot hp3 = new HistogramPlot ();
hp3.DataSource = xs3;
hp3.Label = "P2P Downloads";
hp3.FillGradient = new ColorGradient (Colors.Red, Colors.White);
hp3.Filled = true;
hp3.StackedTo (hp2);
plotCanvas.Add (hp1);
plotCanvas.Add (hp2);
plotCanvas.Add (hp3);
plotCanvas.Legend = new Legend();
LabelAxis la = new LabelAxis (plotCanvas.XAxis1);
la.AddLabel ("Monday", 0.0);
la.AddLabel ("Tuesday", 1.0);
la.AddLabel ("Wednesday", 2.0);
la.AddLabel ("Thursday", 3.0);
la.AddLabel ("Friday", 4.0);
la.AddLabel ("Saturday", 5.0);
la.AddLabel ("Sunday", 6.0);
la.Label = "Days";
la.TickTextFont = Font.FromName ("Courier New").WithSize (8);
la.TicksBetweenText = true;
plotCanvas.XAxis1 = la;
plotCanvas.YAxis1.WorldMin = 0.0;
plotCanvas.YAxis1.Label = "MBytes";
((LinearAxis)plotCanvas.YAxis1).NumberOfSmallTicks = 1;
plotCanvas.Title = "Internet useage for user:\n johnc 09/01/03 - 09/07/03";
plotCanvas.XAxis1.TickTextAngle = 30.0;
PackStart (plotCanvas.Canvas, true);
Label l = new Label (infoText);
PackStart (l);
}
/// <summary>
/// Stack the histogram to another HistogramPlot.
/// </summary>
public void StackedTo(HistogramPlot hp)
{
SequenceAdapter data = new SequenceAdapter (DataSource, DataMember, OrdinateData, AbscissaData);
SequenceAdapter hpData = new SequenceAdapter (hp.DataSource, hp.DataMember, hp.OrdinateData, hp.AbscissaData);
if (hp != null) {
IsStacked = true;
if (hpData.Count != data.Count) {
throw new XwPlotException ("Can stack HistogramPlot data only with the same number of datapoints");
}
for (int i=0; i < data.Count; ++i) {
if (data[i].X != hpData[i].X) {
throw new XwPlotException ("Can stack HistogramPlot data only with the same X coordinates");
}
if (hpData[i].Y < 0.0) {
throw new XwPlotException ("Can stack HistogramPlot data only with positive Y coordinates");
}
}
}
stackedTo = hp;
}
/// <summary>
/// Draws the histogram.
/// </summary>
/// <param name="ctx">The Drawing Context with which to draw</param>
/// <param name="xAxis">The X-Axis to draw against.</param>
/// <param name="yAxis">The Y-Axis to draw against.</param>
public void Draw(Context ctx, PhysicalAxis xAxis, PhysicalAxis yAxis)
{
double yoff;
SequenceAdapter data = new SequenceAdapter(DataSource, DataMember, OrdinateData, AbscissaData);
ctx.Save();
ctx.SetLineWidth(1);
for (int i = 0; i < data.Count; ++i)
{
// (1) determine the top left hand point of the bar (assuming not centered)
Point p1 = data[i];
if (double.IsNaN(p1.X) || double.IsNaN(p1.Y))
{
continue;
}
// (2) determine the top right hand point of the bar (assuming not centered)
Point p2 = Point.Zero;;
if (i + 1 != data.Count)
{
p2 = data[i + 1];
if (double.IsNaN(p2.X) || double.IsNaN(p2.Y))
{
continue;
}
p2.Y = p1.Y;
}
else if (i != 0)
{
p2 = data[i - 1];
if (double.IsNaN(p2.X) || double.IsNaN(p2.Y))
{
continue;
}
double offset = p1.X - p2.X;
p2.X = p1.X + offset;
p2.Y = p1.Y;
}
else
{
double offset = 1.0;
p2.X = p1.X + offset;
p2.Y = p1.Y;
}
// (3) now account for plots this may be stacked on top of.
HistogramPlot currentPlot = this;
yoff = 0.0;
double yval = 0.0;
while (currentPlot.IsStacked)
{
SequenceAdapter stackedToData = new SequenceAdapter(
currentPlot.stackedTo.DataSource,
currentPlot.stackedTo.DataMember,
currentPlot.stackedTo.OrdinateData,
currentPlot.stackedTo.AbscissaData);
yval += stackedToData[i].Y;
yoff = yAxis.WorldToPhysical(yval, false).Y;
p1.Y += stackedToData[i].Y;
p2.Y += stackedToData[i].Y;
currentPlot = currentPlot.stackedTo;
}
// (4) now account for centering
if (Center)
{
double offset = (p2.X - p1.X) / 2.0;
p1.X -= offset;
p2.X -= offset;
}
// (5) now account for BaseOffset (shift of bar sideways).
p1.X += BaseOffset;
p2.X += BaseOffset;
// (6) now get physical coordinates of top two points.
Point xPos1 = xAxis.WorldToPhysical(p1.X, false);
Point yPos1 = yAxis.WorldToPhysical(p1.Y, false);
Point xPos2 = xAxis.WorldToPhysical(p2.X, false);
if (IsStacked)
{
currentPlot = this;
while (currentPlot.IsStacked)
{
currentPlot = currentPlot.stackedTo;
}
baseWidth = currentPlot.baseWidth;
}
double width = xPos2.X - xPos1.X;
double height;
if (IsStacked)
{
height = -yPos1.Y + yoff;
}
else
{
height = -yPos1.Y + yAxis.PhysicalMin.Y;
}
double xoff = (1.0 - baseWidth) / 2.0 * width;
Rectangle bar = new Rectangle(xPos1.X + xoff, yPos1.Y, width - 2 * xoff, height);
ctx.Rectangle(bar);
if (Filled)
{
if (bar.Height != 0 && bar.Width != 0)
{
if (FillGradient != null)
{
// Scale FillGradient to bar rectangle
double sX = bar.X + fillGradient.StartPoint.X * bar.Width;
double sY = bar.Y + fillGradient.StartPoint.Y * bar.Height;
double eX = bar.X + fillGradient.EndPoint.X * bar.Width;
double eY = bar.Y + fillGradient.EndPoint.Y * bar.Height;
LinearGradient g = new LinearGradient(sX, sY, eX, eY);
g.AddColorStop(0, FillGradient.StartColor);
g.AddColorStop(1, FillGradient.EndColor);
ctx.Pattern = g;
}
else
{
ctx.SetColor(FillColor);
}
ctx.FillPreserve();
}
}
ctx.SetColor(BorderColor);
ctx.Stroke();
}
ctx.Restore();
}