private float GetMaxHeight(PaneList paneList, Graphics g, float scaleFactor)
{
// Set up some scaled dimensions for calculating sizes and locations
float defaultCharHeight = FontSpec.GetHeight(scaleFactor);
float maxCharHeight = defaultCharHeight;
// Find the largest charHeight, just in case the curves have individual fonts defined
foreach (GraphPane tmpPane in paneList)
{
foreach (CurveItem curve in tmpPane.CurveList)
{
if (curve._label._text != string.Empty && curve._label._isVisible)
{
float tmpHeight = defaultCharHeight;
if (curve._label._fontSpec != null)
{
tmpHeight = curve._label._fontSpec.GetHeight(scaleFactor);
}
// Account for multiline legend entries
tmpHeight *= curve._label._text.Split('\n').Length;
if (tmpHeight > maxCharHeight)
{
maxCharHeight = tmpHeight;
}
}
}
}
return(maxCharHeight);
}
/// <summary>
/// The Copy Constructor
/// </summary>
/// <param name="rhs">The <see c_ref="PaneList"/> object from which to copy</param>
public PaneList(PaneList rhs)
{
foreach (GraphPane item in rhs)
{
Add(item.Clone());
}
}
private PaneList GetPaneList(PaneBase pane)
{
// For a single GraphPane, create a PaneList to contain it
// Otherwise, just use the paneList from the MasterPane
PaneList paneList;
if (pane is GraphPane)
{
paneList = new PaneList();
paneList.Add((GraphPane)pane);
}
else
{
paneList = ((MasterPane)pane).PaneList;
}
return(paneList);
}
/// <summary>
/// Determine if a mouse point is within the legend, and if so, which legend
/// entry (<see c_ref="CurveItem"/>) is nearest.
/// </summary>
/// <param name="mousePt">The screen point, in pixel coordinates.</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>
/// <param name="index">The index number of the <see c_ref="CurveItem"/> legend
/// entry that is under the mouse point. The <see c_ref="CurveItem"/> object is
/// accessible via <see c_ref="GraphPane.CurveList">CurveList[index]</see>.
/// </param>
/// <returns>true if the mouse point is within the <see c_ref="Legend"/> bounding
/// box, false otherwise.</returns>
/// <seealso c_ref="GraphPane.FindNearestObject"/>
public bool FindPoint(PointF mousePt, PaneBase pane, float scaleFactor, out int index)
{
index = -1;
if (_rect.Contains(mousePt))
{
int j = (int)((mousePt.Y - _rect.Top) / _legendItemHeight);
int i = (int)((mousePt.X - _rect.Left - _tmpSize / 2.0f) / _legendItemWidth);
if (i < 0)
{
i = 0;
}
if (i >= _hStack)
{
i = _hStack - 1;
}
int pos = i + j * _hStack;
index = 0;
PaneList paneList = GetPaneList(pane);
foreach (GraphPane tmpPane in paneList)
{
foreach (CurveItem curve in tmpPane.CurveList)
{
if (curve._label._isVisible && curve._label._text != string.Empty)
{
if (pos == 0)
{
return(true);
}
pos--;
}
index++;
}
}
return(true);
}
return(false);
}
/// <summary>
/// Calculate the <see c_ref="Legend"/> rectangle (<see c_ref="Rect"/>),
/// taking into account the number of required legend
/// entries, and the legend drawing preferences.
/// </summary>
/// <remarks>Adjust the size of the
/// <see c_ref="Chart.Rect"/> for the parent <see c_ref="GraphPane"/> to accomodate the
/// space required by the legend.
/// </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>
/// <param name="tChartRect">
/// The rectangle that contains the area bounded by the axes, in pixel units.
/// <seealso c_ref="Chart.Rect" />
/// </param>
public void CalcRect(Graphics g, PaneBase pane, float scaleFactor,
ref RectangleF tChartRect)
{
// Start with an empty rectangle
_rect = Rectangle.Empty;
_hStack = 1;
_legendItemWidth = 1;
_legendItemHeight = 0;
RectangleF clientRect = pane.CalcClientRect(g, scaleFactor);
// If the legend is invisible, don't do anything
if (!_isVisible)
{
return;
}
int nCurve = 0;
PaneList paneList = GetPaneList(pane);
_tmpSize = GetMaxHeight(paneList, g, scaleFactor);
float halfGap = _tmpSize / 2.0F,
maxWidth = 0,
tmpWidth,
gapPix = _gap * _tmpSize;
foreach (GraphPane tmpPane in paneList)
{
// Loop through each curve in the curve list
// Find the maximum width of the legend labels
//foreach ( CurveItem curve in tmpPane.CurveList )
//foreach ( CurveItem curve in GetIterator( tmpPane.CurveList, _isReverse ) )
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 != string.Empty && curve._label._isVisible)
{
// Calculate the width of the label save the max width
FontSpec tmpFont = (curve._label._fontSpec != null) ?
curve._label._fontSpec : FontSpec;
tmpWidth = tmpFont.GetWidth(g, curve._label._text, scaleFactor);
if (tmpWidth > maxWidth)
{
maxWidth = tmpWidth;
}
// Save the maximum symbol height for line-type curves
if (curve is LineItem && ((LineItem)curve).Symbol.Size > _legendItemHeight)
{
_legendItemHeight = ((LineItem)curve).Symbol.Size;
}
nCurve++;
}
}
if (pane is MasterPane && ((MasterPane)pane).IsUniformLegendEntries)
{
break;
}
}
float widthAvail;
// Is this legend horizontally stacked?
if (_isHStack)
{
// Determine the available space for horizontal stacking
switch (_position)
{
// Never stack if the legend is to the right or left
case LegendPos.Right:
case LegendPos.Left:
widthAvail = 0;
break;
// for the top & bottom, the axis border width is available
case LegendPos.Top:
case LegendPos.TopCenter:
case LegendPos.Bottom:
case LegendPos.BottomCenter:
widthAvail = tChartRect.Width;
break;
// for the top & bottom flush left, the panerect less margins is available
case LegendPos.TopFlushLeft:
case LegendPos.BottomFlushLeft:
widthAvail = clientRect.Width;
break;
// for inside the axis area or Float, use 1/2 of the axis border width
case LegendPos.InsideTopRight:
case LegendPos.InsideTopLeft:
case LegendPos.InsideBotRight:
case LegendPos.InsideBotLeft:
case LegendPos.Float:
widthAvail = tChartRect.Width / 2;
break;
// shouldn't ever happen
default:
widthAvail = 0;
break;
}
// width of one legend entry
if (_isShowLegendSymbols)
{
_legendItemWidth = 3.0f * _tmpSize + maxWidth;
}
else
{
_legendItemWidth = 0.5f * _tmpSize + maxWidth;
}
// Calculate the number of columns in the legend
// Normally, the legend is:
// available width / ( max width of any entry + space for line&symbol )
if (maxWidth > 0)
{
_hStack = (int)((widthAvail - halfGap) / _legendItemWidth);
}
// You can never have more columns than legend entries
if (_hStack > nCurve)
{
_hStack = nCurve;
}
// a saftey check
if (_hStack == 0)
{
_hStack = 1;
}
}
else
{
if (_isShowLegendSymbols)
{
_legendItemWidth = 3.0F * _tmpSize + maxWidth;
}
else
{
_legendItemWidth = 0.5F * _tmpSize + maxWidth;
}
}
// legend is:
// item: space line space text space
// width: wid 4*wid wid maxWid wid
// The symbol is centered on the line
//
// legend begins 3 * wid to the right of the plot rect
//
// The height of the legend is the actual height of the lines of text
// (nCurve * hite) plus wid on top and wid on the bottom
// total legend width
float totLegWidth = _hStack * _legendItemWidth;
// The total legend height
_legendItemHeight = _legendItemHeight * scaleFactor + halfGap;
if (_tmpSize > _legendItemHeight)
{
_legendItemHeight = _tmpSize;
}
float totLegHeight = (float)Math.Ceiling(nCurve / (double)_hStack)
* _legendItemHeight;
RectangleF newRect = new RectangleF();
// Now calculate the legend rect based on the above determined parameters
// Also, adjust the ChartRect to reflect the space for the legend
if (nCurve > 0)
{
newRect = new RectangleF(0, 0, totLegWidth, totLegHeight);
// The switch statement assigns the left and top edges, and adjusts the ChartRect
// as required. The right and bottom edges are calculated at the bottom of the switch.
switch (_position)
{
case LegendPos.Right:
newRect.X = clientRect.Right - totLegWidth;
newRect.Y = tChartRect.Top;
tChartRect.Width -= totLegWidth + gapPix;
break;
case LegendPos.Top:
newRect.X = tChartRect.Left;
newRect.Y = clientRect.Top;
tChartRect.Y += totLegHeight + gapPix;
tChartRect.Height -= totLegHeight + gapPix;
break;
case LegendPos.TopFlushLeft:
newRect.X = clientRect.Left;
newRect.Y = clientRect.Top;
tChartRect.Y += totLegHeight + gapPix * 1.5f;
tChartRect.Height -= totLegHeight + gapPix * 1.5f;
break;
case LegendPos.TopCenter:
newRect.X = tChartRect.Left + (tChartRect.Width - totLegWidth) / 2;
newRect.Y = tChartRect.Top;
tChartRect.Y += totLegHeight + gapPix;
tChartRect.Height -= totLegHeight + gapPix;
break;
case LegendPos.Bottom:
newRect.X = tChartRect.Left;
newRect.Y = clientRect.Bottom - totLegHeight;
tChartRect.Height -= totLegHeight + gapPix;
break;
case LegendPos.BottomFlushLeft:
newRect.X = clientRect.Left;
newRect.Y = clientRect.Bottom - totLegHeight;
tChartRect.Height -= totLegHeight + gapPix;
break;
case LegendPos.BottomCenter:
newRect.X = tChartRect.Left + (tChartRect.Width - totLegWidth) / 2;
newRect.Y = clientRect.Bottom - totLegHeight;
tChartRect.Height -= totLegHeight + gapPix;
break;
case LegendPos.Left:
newRect.X = clientRect.Left;
newRect.Y = tChartRect.Top;
tChartRect.X += totLegWidth + halfGap;
tChartRect.Width -= totLegWidth + gapPix;
break;
case LegendPos.InsideTopRight:
newRect.X = tChartRect.Right - totLegWidth;
newRect.Y = tChartRect.Top;
break;
case LegendPos.InsideTopLeft:
newRect.X = tChartRect.Left;
newRect.Y = tChartRect.Top;
break;
case LegendPos.InsideBotRight:
newRect.X = tChartRect.Right - totLegWidth;
newRect.Y = tChartRect.Bottom - totLegHeight;
break;
case LegendPos.InsideBotLeft:
newRect.X = tChartRect.Left;
newRect.Y = tChartRect.Bottom - totLegHeight;
break;
case LegendPos.Float:
newRect.Location = Location.TransformTopLeft(pane, totLegWidth, totLegHeight);
break;
}
}
_rect = newRect;
}
/// <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);
}
}
}