public void AddLegend(Graphics g, DataCollection dc, ChartStyle cs)
{
if (dc.DataSeriesList.Count < 1) {
return;
}
if (!IsLegendVisible) {
return;
}
int numberOfDataSeries = dc.DataSeriesList.Count;
string[] legendLabels = new string[dc.DataSeriesList.Count];
int n = 0;
foreach (DataSeries ds in dc.DataSeriesList) {
legendLabels [n] = ds.SeriesName;
n++;
}
//float offSet = 10;
float xc = 0f;
float yc = 0f;
SizeF size = g.MeasureString (legendLabels [0], LegendFont);
float legendWidth = size.Width;
for (int i = 0; i < legendLabels.Length; i++) {
size = g.MeasureString (legendLabels [i], LegendFont);
float tempWidth = size.Width;
if (legendWidth < tempWidth)
legendWidth = tempWidth;
}
legendWidth = legendWidth + 50.0f;
float hWidth = legendWidth / 2;
float legendHeight = 18.0f * numberOfDataSeries;
float hHeight = legendHeight / 2;
Rectangle rect = cs.SetPolarArea ();
xc = rect.X + rect.Width + cs.Offset + 15 + hWidth / 2;
yc = rect.Y + rect.Height / 2;
DrawLegend (g, xc, yc, hWidth, hHeight, dc, cs);
}
// Shared initialization code
void Initialize()
{
this.AutoresizingMask = NSViewResizingMask.HeightSizable | NSViewResizingMask.WidthSizable;
BackColor = Color.Wheat;
PlotPanel = new PlotPanel (Frame);
this.AddSubview (PlotPanel);
// Subscribing to a paint eventhandler to drawingPanel:
PlotPanel.Paint +=
new PaintEventHandler (PlotPanelPaint);
dc = new DataCollection ();
cs = new ChartStyle (this);
// cs.RMax = 0.5f;
// cs.RMin = 0f;
cs.RMax = 1f;
cs.RMin = -5f;
cs.NTicks = 4;
cs.AngleStep = 30;
cs.AngleDirection = ChartStyle.AngleDirectionEnum.CounterClockWise;
lg = new Legend ();
lg.IsLegendVisible = true;
}
private void DrawLegend(Graphics g, float xCenter, float yCenter,
float hWidth, float hHeight, DataCollection dc, ChartStyle cs)
{
float spacing = 8.0f;
float textHeight = 8.0f;
float htextHeight = textHeight / 2.0f;
float lineLength = 30.0f;
float hlineLength = lineLength / 2.0f;
Rectangle legendRectangle;
Pen aPen = new Pen (LegendBorderColor, 1f);
SolidBrush aBrush = new SolidBrush (LegendBackColor);
if (isLegendVisible) {
legendRectangle = new Rectangle ((int)xCenter - (int)hWidth,
(int)yCenter - (int)hHeight,
(int)(2.0f * hWidth), (int)(2.0f * hHeight));
g.FillRectangle (aBrush, legendRectangle);
if (IsBorderVisible) {
g.DrawRectangle (aPen, legendRectangle);
}
int n = 1;
foreach (DataSeries ds in dc.DataSeriesList) {
// Draw lines and symbols:
float xSymbol = legendRectangle.X + spacing + hlineLength;
float xText = legendRectangle.X + 2 * spacing + lineLength;
float yText = legendRectangle.Y + n * spacing + (2 * n - 1) * htextHeight;
aPen = new Pen (ds.LineStyle.LineColor, ds.LineStyle.Thickness);
aPen.DashStyle = ds.LineStyle.Pattern;
PointF ptStart = new PointF (legendRectangle.X + spacing, yText);
PointF ptEnd = new PointF (legendRectangle.X + spacing + lineLength, yText);
g.DrawLine (aPen, ptStart, ptEnd);
// Draw text:
StringFormat sFormat = new StringFormat ();
sFormat.Alignment = StringAlignment.Near;
g.DrawString (ds.SeriesName, LegendFont, new SolidBrush (textColor),
new PointF (xText, yText - 8), sFormat);
n++;
}
}
aPen.Dispose ();
aBrush.Dispose ();
}
