/// <summary>
/// Render the <see c_ref="Legend"/> to the specified <see c_ref="Graphics"/> device.
/// </summary>
/// <remarks>
/// This method is normally only called by the Draw method
/// of the parent <see c_ref="GraphPane"/> object.
/// </remarks>
/// <param name="g">
/// A graphic device object to be drawn into. This is normally e.Graphics from the
/// PaintEventArgs argument to the Paint() method.
/// </param>
/// <param name="pane">
/// A reference to the <see c_ref="PaneBase"/> object that is the parent or
/// owner of this object.
/// </param>
/// <param name="scaleFactor">
/// The scaling factor to be used for rendering objects. This is calculated and
/// passed down by the parent <see c_ref="GraphPane"/> object using the
/// <see c_ref="PaneBase.CalcScaleFactor"/> method, and is used to proportionally adjust
/// font sizes, etc. according to the actual size of the graph.
/// </param>
public void Draw(Graphics g, PaneBase pane, float scaleFactor)
{
// if the legend is not visible, do nothing
if (!_isVisible)
{
return;
}
// Fill the background with the specified color if required
_fill.Draw(g, _rect);
PaneList paneList = GetPaneList(pane);
float halfGap = _tmpSize / 2.0F;
// Check for bad data values
if (_hStack <= 0)
{
_hStack = 1;
}
if (_legendItemWidth <= 0)
{
_legendItemWidth = 100;
}
if (_legendItemHeight <= 0)
{
_legendItemHeight = _tmpSize;
}
//float gap = pane.ScaledGap( scaleFactor );
int iEntry = 0;
float x, y;
// Get a brush for the legend label text
using (SolidBrush brushB = new SolidBrush(Color.Black))
{
foreach (GraphPane tmpPane in paneList)
{
// Loop for each curve in the CurveList collection
//foreach ( CurveItem curve in tmpPane.CurveList )
int count = tmpPane.CurveList.Count;
for (int i = 0; i < count; i++)
{
CurveItem curve = tmpPane.CurveList[_isReverse ? count - i - 1 : i];
if (curve._label._text != "" && curve._label._isVisible)
{
// Calculate the x,y (TopLeft) location of the current
// curve legend label
// assuming:
// charHeight/2 for the left margin, plus legendWidth for each
// horizontal column
// legendHeight is the line spacing, with no extra margin above
x = _rect.Left + halfGap / 2.0F +
(iEntry % _hStack) * _legendItemWidth;
y = _rect.Top + iEntry / _hStack * _legendItemHeight;
// Draw the legend label for the current curve
FontSpec tmpFont = (curve._label._fontSpec != null) ?
curve._label._fontSpec : FontSpec;
// This is required because, for long labels, the centering can affect the
// position in GDI+.
tmpFont.StringAlignment = StringAlignment.Near;
if (_isShowLegendSymbols)
{
tmpFont.Draw(g, pane, curve._label._text,
x + 2.5F * _tmpSize, y + _legendItemHeight / 2.0F + 1,
AlignH.Left, AlignV.Center, scaleFactor);
RectangleF rect = new RectangleF(x, y + _legendItemHeight / 4.0F,
2 * _tmpSize, _legendItemHeight / 2.0F);
curve.DrawLegendKey(g, tmpPane, rect, scaleFactor);
}
else
{
if (curve._label._fontSpec == null)
{
tmpFont.FontColor = curve.Color;
}
tmpFont.Draw(g, pane, curve._label._text,
x + 0.0F * _tmpSize, y + _legendItemHeight / 2.0F,
AlignH.Left, AlignV.Center, scaleFactor);
}
// maintain a curve count for positioning
iEntry++;
}
}
if (pane is MasterPane && ((MasterPane)pane).IsUniformLegendEntries)
{
break;
}
}
// Draw a border around the legend if required
if (iEntry > 0)
{
Border.Draw(g, pane, scaleFactor, _rect);
}
}
}
