public void AddLegend(Graphics g, DataSeries ds, ChartStyle cs)
{
if (ds.DataList.Count < 1)
{
return;
}
if (!IsLegendVisible)
{
return;
}
int numberOfDataValues = ds.DataList.Count;
string[] legendLabels = new string[ds.LabelList.Count];
for (int i = 0; i < ds.LabelList.Count;i++)
{
legendLabels[i] = (string)ds.LabelList[i];
}
// float offSet = 20;
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 + 35.0f;
float hWidth = legendWidth / 2;
float legendHeight = 18.0f * numberOfDataValues;
float hHeight = legendHeight / 2;
Rectangle rect = cs.SetPieArea();
xc = rect.X + rect.Width + cs.Offset + 20 + hWidth / 2;
yc = rect.Y + rect.Height / 2;
DrawLegend(g, xc, yc, hWidth, hHeight, ds, cs);
}
private void DrawLegend(Graphics g, float xCenter, float yCenter,
float hWidth, float hHeight, DataSeries ds, ChartStyle cs)
{
float spacing = 8.0f;
float textHeight = 8.0f;
float htextHeight = textHeight / 2.0f;
float lineLength = 12.0f;
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);
}
for (int i = 0; i < ds.DataList.Count; i++)
{
float xSymbol = legendRectangle.X + spacing + hlineLength;
float xText = legendRectangle.X + 2 * spacing + lineLength;
float yText = legendRectangle.Y + (i + 1) * spacing +
(2 * i + 1) * htextHeight;
aPen = new Pen(ds.BorderColor, ds.BorderThickness);
Color fillColor = Color.FromArgb(ds.CMap[i, 0], ds.CMap[i, 1],
ds.CMap[i, 2], ds.CMap[i, 3]);
aBrush = new SolidBrush(fillColor);
// Draw symbols:
float hsize = 5f;
PointF[] pts = new PointF[4];
pts[0] = new PointF(xSymbol - hsize, yText - hsize);
pts[1] = new PointF(xSymbol + hsize, yText - hsize);
pts[2] = new PointF(xSymbol + hsize, yText + hsize);
pts[3] = new PointF(xSymbol - hsize, yText + hsize);
g.FillPolygon(aBrush, pts);
g.DrawPolygon(aPen, pts);
// Draw text:
StringFormat sFormat = new StringFormat();
sFormat.Alignment = StringAlignment.Near;
g.DrawString((string)ds.LabelList[i], LegendFont,
new SolidBrush(TextColor),
new PointF(xText, yText - 8), sFormat);
}
}
aPen.Dispose();
aBrush.Dispose();
}
// 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);
cs = new ChartStyle(this);
ds = new DataSeries();
lg = new Legend(this);
lg.IsLegendVisible = true;
}
