/**
* Does the same as {@link #line(String, java.awt.Color, String)},
* but the graph gets stacked on top of the
* previous LINE, AREA or STACK graph. Depending on the type of the
* previous graph, the STACK will be either a LINE or an AREA. This
* obviously implies that the first STACK must be preceded by an AREA
* or LINE.
* <p/>
* Note, that when you STACK onto *UNKNOWN* data, Rrd4n will not
* draw any graphics ... *UNKNOWN* is not zero.
*
* @param srcName Virtual source name
* @param color Stacked graph color
* @param legend Legend text
* @throws ArgumentException Thrown if this STACK has no previously defined AREA, STACK or LINE
* graph bellow it.
*/
public void stack(String srcName, Color color, String legend)
{
// find parent AREA or LINE
SourcedPlotElement parent = null;
for (int i = plotElements.Count - 1; i >= 0; i--)
{
PlotElement plotElement = plotElements[i];
if (plotElement.GetType() == typeof(SourcedPlotElement) ||
plotElement.GetType() == typeof(Area) ||
plotElement.GetType() == typeof(Line))
{
parent = (SourcedPlotElement)plotElement;
break;
}
}
if (parent == null)
{
throw new ArgumentException("You have to stack graph onto something (line or area)");
}
else
{
LegendText legendText = new LegendText(color, legend);
comments.Add(legendText);
plotElements.Add(new Stack(parent, srcName, color));
}
}
private void drawData()
{
worker.setAntiAliasing(gdef.antiAliasing);
worker.clip(im.xorigin + 1, im.yorigin - gdef.height - 1, gdef.width - 1, gdef.height + 2);
double areazero = mapper.ytr((im.minval > 0.0) ? im.minval : (im.maxval < 0.0) ? im.maxval : 0.0);
double[] x = xtr(dproc.getTimestamps()), lastY = null;
// draw line, area and stack
foreach (PlotElement plotElement in gdef.plotElements)
{
if (plotElement.GetType() == typeof(Line) ||
plotElement.GetType() == typeof(Area) ||
plotElement.GetType() == typeof(Stack))
{
SourcedPlotElement source = (SourcedPlotElement)plotElement;
double[] y = ytr(source.getValues());
if (source.GetType() == typeof(Line))
{
worker.drawPolyline(x, y, source.color, ((Line)source).width);
}
else if (source.GetType() == typeof(Area))
{
worker.fillPolygon(x, areazero, y, source.color);
}
else if (source.GetType() == typeof(Stack))
{
Stack stack = (Stack)source;
float width = stack.getParentLineWidth();
if (width >= 0F)
{
// line
worker.drawPolyline(x, y, stack.color, width);
}
else
{
// area
worker.fillPolygon(x, lastY, y, stack.color);
worker.drawPolyline(x, lastY, stack.getParentColor(), 0);
}
}
else
{
// should not be here
throw new ApplicationException("Unknown plot source: " + source.GetType());
}
lastY = y;
}
}
worker.reset();
worker.setAntiAliasing(false);
}
internal Stack(SourcedPlotElement parent, String srcName, Color color)
: base(srcName, color)
{
this.parent = parent;
}
internal Stack(SourcedPlotElement parent, String srcName, Color color)
: base(srcName, color)
{
this.parent = parent;
}