/// <summary>
/// Determine the coords for the rectangle associated with a specified point for
/// this <see cref="CurveItem" />
/// </summary>
/// <param name="pane">The <see cref="GraphPane" /> to which this curve belongs</param>
/// <param name="i">The index of the point of interest</param>
/// <param name="coords">A list of coordinates that represents the "rect" for
/// this point (used in an html AREA tag)</param>
/// <returns>true if it's a valid point, false otherwise</returns>
public override bool GetCoords( GraphPane pane, int i, out string coords )
{
coords = string.Empty;
if ( i < 0 || i >= _points.Count )
return false;
PointPair pt = _points[i];
if ( pt.IsInvalid )
return false;
double x, y, z;
ValueHandler valueHandler = new ValueHandler( pane, false );
valueHandler.GetValues( this, i, out x, out z, out y );
Axis yAxis = GetYAxis( pane );
Axis xAxis = GetXAxis( pane );
PointF pixPt = new PointF( xAxis.Scale.Transform( _isOverrideOrdinal, i, x ),
yAxis.Scale.Transform( _isOverrideOrdinal, i, y ) );
if ( !pane.Chart.Rect.Contains( pixPt ) )
return false;
float halfSize = _symbol.Size * pane.CalcScaleFactor();
coords = String.Format( "{0:f0},{1:f0},{2:f0},{3:f0}",
pixPt.X - halfSize, pixPt.Y - halfSize,
pixPt.X + halfSize, pixPt.Y + halfSize );
return true;
}
/// <summary>
/// Draw all the <see cref="ErrorBar"/>'s to the specified <see cref="Graphics"/>
/// device as a an error bar at each defined point.
/// </summary>
/// <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 cref="GraphPane"/> object that is the parent or
/// owner of this object.
/// </param>
/// <param name="curve">A <see cref="CurveItem"/> object representing the
/// <see cref="Bar"/>'s to be drawn.</param>
/// <param name="baseAxis">The <see cref="Axis"/> class instance that defines the base (independent)
/// axis for the <see cref="Bar"/></param>
/// <param name="valueAxis">The <see cref="Axis"/> class instance that defines the value (dependent)
/// axis for the <see cref="Bar"/></param>
/// <param name="scaleFactor">
/// The scaling factor to be used for rendering objects. This is calculated and
/// passed down by the parent <see cref="GraphPane"/> object using the
/// <see cref="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, GraphPane pane, ErrorBarItem curve,
Axis baseAxis, Axis valueAxis, float scaleFactor )
{
ValueHandler valueHandler = new ValueHandler( pane, false );
float pixBase, pixValue, pixLowValue;
double scaleBase, scaleValue, scaleLowValue;
if ( curve.Points != null && this.IsVisible )
{
using ( Pen pen = !curve.IsSelected ? new Pen( _color, _penWidth ) :
new Pen( Selection.Border.Color, Selection.Border.Width ) )
{
// Loop over each defined point
for ( int i = 0; i < curve.Points.Count; i++ )
{
valueHandler.GetValues( curve, i, out scaleBase,
out scaleLowValue, out scaleValue );
// Any value set to double max is invalid and should be skipped
// This is used for calculated values that are out of range, divide
// by zero, etc.
// Also, any value <= zero on a log scale is invalid
if ( !curve.Points[i].IsInvalid3D &&
( scaleBase > 0 || !baseAxis._scale.IsLog ) &&
( ( scaleValue > 0 && scaleLowValue > 0 ) || !valueAxis._scale.IsLog ) )
{
pixBase = baseAxis.Scale.Transform( curve.IsOverrideOrdinal, i, scaleBase );
pixValue = valueAxis.Scale.Transform( curve.IsOverrideOrdinal, i, scaleValue );
pixLowValue = valueAxis.Scale.Transform( curve.IsOverrideOrdinal, i, scaleLowValue );
//if ( this.fill.IsGradientValueType )
// brush = fill.MakeBrush( _rect, _points[i] );
this.Draw( g, pane, baseAxis is XAxis || baseAxis is X2Axis, pixBase, pixValue,
pixLowValue, scaleFactor, pen, curve.IsSelected,
curve.Points[i] );
}
}
}
}
}
/// <summary>
/// Find the data point that lies closest to the specified mouse (screen)
/// point.
/// </summary>
/// <remarks>
/// This method will search through the specified list of curves to find which point is
/// nearest. It will only consider points that are within
/// <see cref="Default.NearestTol"/> pixels of the screen point, and it will
/// only consider <see cref="CurveItem"/>'s that are in
/// <paramref name="targetCurveList"/>.
/// </remarks>
/// <param name="mousePt">The screen point, in pixel coordinates.</param>
/// <param name="targetCurveList">A <see cref="CurveList"/> object containing
/// a subset of <see cref="CurveItem"/>'s to be searched.</param>
/// <param name="nearestCurve">A reference to the <see cref="CurveItem"/>
/// instance that contains the closest point. nearestCurve will be null if
/// no data points are available.</param>
/// <param name="iNearest">The index number of the closest point. The
/// actual data vpoint will then be <see cref="CurveItem.Points">CurveItem.Points[iNearest]</see>
/// . iNearest will
/// be -1 if no data points are available.</param>
/// <returns>true if a point was found and that point lies within
/// <see cref="Default.NearestTol"/> pixels
/// of the screen point, false otherwise.</returns>
public bool FindNearestPoint( PointF mousePt, CurveList targetCurveList,
out CurveItem nearestCurve, out int iNearest )
{
CurveItem nearestBar = null;
int iNearestBar = -1;
nearestCurve = null;
iNearest = -1;
// If the point is outside the ChartRect, always return false
if ( !_chart._rect.Contains( mousePt ) )
return false;
double x, x2;
double[] y;
double[] y2;
//ReverseTransform( mousePt, out x, out y, out y2 );
ReverseTransform( mousePt, out x, out x2, out y, out y2 );
if ( !AxisRangesValid() )
return false;
ValueHandler valueHandler = new ValueHandler( this, false );
//double yPixPerUnit = chartRect.Height / ( yAxis.Max - yAxis.Min );
//double y2PixPerUnit; // = chartRect.Height / ( y2Axis.Max - y2Axis.Min );
double yPixPerUnitAct, yAct, yMinAct, yMaxAct, xAct;
double minDist = 1e20;
double xVal, yVal, dist = 99999, distX, distY;
double tolSquared = Default.NearestTol * Default.NearestTol;
int iBar = 0;
foreach ( CurveItem curve in targetCurveList )
{
//test for pie first...if it's a pie rest of method superfluous
if ( curve is PieItem && curve.IsVisible )
{
if ( ( (PieItem)curve ).SlicePath != null &&
( (PieItem)curve ).SlicePath.IsVisible( mousePt ) )
{
nearestBar = curve;
iNearestBar = 0;
}
continue;
}
else if ( curve.IsVisible )
{
int yIndex = curve.GetYAxisIndex( this );
Axis yAxis = curve.GetYAxis( this );
Axis xAxis = curve.GetXAxis( this );
if ( curve.IsY2Axis )
{
yAct = y2[yIndex];
yMinAct = _y2AxisList[yIndex]._scale._min;
yMaxAct = _y2AxisList[yIndex]._scale._max;
}
else
{
yAct = y[yIndex];
yMinAct = _yAxisList[yIndex]._scale._min;
yMaxAct = _yAxisList[yIndex]._scale._max;
}
yPixPerUnitAct = _chart._rect.Height / ( yMaxAct - yMinAct );
double xPixPerUnit = _chart._rect.Width / ( xAxis._scale._max - xAxis._scale._min );
xAct = xAxis is XAxis ? x : x2;
IPointList points = curve.Points;
float barWidth = curve.GetBarWidth( this );
double barWidthUserHalf;
Axis baseAxis = curve.BaseAxis( this );
bool isXBaseAxis = ( baseAxis is XAxis || baseAxis is X2Axis );
if ( isXBaseAxis )
barWidthUserHalf = barWidth / xPixPerUnit / 2.0;
else
barWidthUserHalf = barWidth / yPixPerUnitAct / 2.0;
if ( points != null )
{
for ( int iPt = 0; iPt < curve.NPts; iPt++ )
{
// xVal is the user scale X value of the current point
if ( xAxis._scale.IsAnyOrdinal && !curve.IsOverrideOrdinal )
xVal = (double)iPt + 1.0;
else
xVal = points[iPt].X;
// yVal is the user scale Y value of the current point
if ( yAxis._scale.IsAnyOrdinal && !curve.IsOverrideOrdinal )
yVal = (double)iPt + 1.0;
else
yVal = points[iPt].Y;
if ( xVal != PointPair.Missing &&
yVal != PointPair.Missing )
{
if ( curve.IsBar || curve is ErrorBarItem ||
curve is HiLowBarItem || curve is OHLCBarItem ||
curve is JapaneseCandleStickItem )
{
double baseVal, lowVal, hiVal;
valueHandler.GetValues( curve, iPt, out baseVal,
out lowVal, out hiVal );
if ( lowVal > hiVal )
{
double tmpVal = lowVal;
lowVal = hiVal;
hiVal = tmpVal;
}
if ( isXBaseAxis )
{
double centerVal = valueHandler.BarCenterValue( curve, barWidth, iPt, xVal, iBar );
if ( xAct < centerVal - barWidthUserHalf ||
xAct > centerVal + barWidthUserHalf ||
yAct < lowVal || yAct > hiVal )
continue;
}
else
{
double centerVal = valueHandler.BarCenterValue( curve, barWidth, iPt, yVal, iBar );
if ( yAct < centerVal - barWidthUserHalf ||
yAct > centerVal + barWidthUserHalf ||
xAct < lowVal || xAct > hiVal )
continue;
}
if ( nearestBar == null )
{
iNearestBar = iPt;
nearestBar = curve;
}
}
else if ( xVal >= xAxis._scale._min && xVal <= xAxis._scale._max &&
yVal >= yMinAct && yVal <= yMaxAct )
{
if ( curve is LineItem && _lineType == LineType.Stack )
{
double zVal;
valueHandler.GetValues( curve, iPt, out xVal, out zVal, out yVal );
}
distX = ( xVal - xAct ) * xPixPerUnit;
distY = ( yVal - yAct ) * yPixPerUnitAct;
dist = distX * distX + distY * distY;
if ( dist >= minDist )
continue;
minDist = dist;
iNearest = iPt;
nearestCurve = curve;
}
}
}
if ( curve.IsBar )
iBar++;
}
}
}
if ( nearestCurve is LineItem )
{
float halfSymbol = (float)( ( (LineItem)nearestCurve ).Symbol.Size *
CalcScaleFactor() / 2 );
minDist -= halfSymbol * halfSymbol;
if ( minDist < 0 )
minDist = 0;
}
if ( minDist >= tolSquared && nearestBar != null )
{
// if no point met the tolerance, but a bar was found, use it
nearestCurve = nearestBar;
iNearest = iNearestBar;
return true;
}
else if ( minDist < tolSquared )
{
// Did we find a close point, and is it within the tolerance?
// (minDist is the square of the distance in pixel units)
return true;
}
else // otherwise, no valid point found
return false;
}
/// <summary>
/// Determine the coords for the rectangle associated with a specified point for
/// this <see cref="CurveItem" />
/// </summary>
/// <param name="pane">The <see cref="GraphPane" /> to which this curve belongs</param>
/// <param name="i">The index of the point of interest</param>
/// <param name="coords">A list of coordinates that represents the "rect" for
/// this point (used in an html AREA tag)</param>
/// <returns>true if it's a valid point, false otherwise</returns>
public override bool GetCoords( GraphPane pane, int i, out string coords )
{
coords = string.Empty;
if ( i < 0 || i >= _points.Count )
return false;
Axis valueAxis = ValueAxis( pane );
Axis baseAxis = BaseAxis( pane );
// pixBase = pixel value for the bar center on the base axis
// pixHiVal = pixel value for the bar top on the value axis
// pixLowVal = pixel value for the bar bottom on the value axis
float pixBase, pixHiVal, pixLowVal;
float clusterWidth = pane.BarSettings.GetClusterWidth();
float barWidth = GetBarWidth( pane );
float clusterGap = pane._barSettings.MinClusterGap * barWidth;
float barGap = barWidth * pane._barSettings.MinBarGap;
// curBase = the scale value on the base axis of the current bar
// curHiVal = the scale value on the value axis of the current bar
// curLowVal = the scale value of the bottom of the bar
double curBase, curLowVal, curHiVal;
ValueHandler valueHandler = new ValueHandler( pane, false );
valueHandler.GetValues( this, i, out curBase, out curLowVal, out curHiVal );
// Any value set to double max is invalid and should be skipped
// This is used for calculated values that are out of range, divide
// by zero, etc.
// Also, any value <= zero on a log scale is invalid
if ( !_points[i].IsInvalid3D )
{
// calculate a pixel value for the top of the bar on value axis
pixLowVal = valueAxis.Scale.Transform( _isOverrideOrdinal, i, curLowVal );
pixHiVal = valueAxis.Scale.Transform( _isOverrideOrdinal, i, curHiVal );
// calculate a pixel value for the center of the bar on the base axis
pixBase = baseAxis.Scale.Transform( _isOverrideOrdinal, i, curBase );
// Calculate the pixel location for the side of the bar (on the base axis)
float pixSide = pixBase - clusterWidth / 2.0F + clusterGap / 2.0F +
pane.CurveList.GetBarItemPos( pane, this ) * ( barWidth + barGap );
// Draw the bar
if ( baseAxis is XAxis || baseAxis is X2Axis )
coords = String.Format( "{0:f0},{1:f0},{2:f0},{3:f0}",
pixSide, pixLowVal,
pixSide + barWidth, pixHiVal );
else
coords = String.Format( "{0:f0},{1:f0},{2:f0},{3:f0}",
pixLowVal, pixSide,
pixHiVal, pixSide + barWidth );
return true;
}
return false;
}
/// <summary>
/// Create a <see cref="TextObj" /> for each bar in the <see cref="GraphPane" />.
/// </summary>
/// <remarks>
/// This method will go through the bars, create a label that corresponds to the bar value,
/// and place it on the graph depending on user preferences. This works for horizontal or
/// vertical bars in clusters or stacks, but only for <see cref="BarItem" /> types. This method
/// does not apply to <see cref="ErrorBarItem" /> or <see cref="HiLowBarItem" /> objects.
/// Call this method only after calling <see cref="GraphPane.AxisChange()" />.
/// </remarks>
/// <param name="pane">The GraphPane in which to place the text labels.</param>
/// <param name="isBarCenter">true to center the labels inside the bars, false to
/// place the labels just above the top of the bar.</param>
/// <param name="valueFormat">The double.ToString string format to use for creating
/// the labels.
/// </param>
/// <param name="fontColor">The color in which to draw the labels</param>
/// <param name="fontFamily">The string name of the font family to use for the labels</param>
/// <param name="fontSize">The floating point size of the font, in scaled points</param>
/// <param name="isBold">true for a bold font type, false otherwise</param>
/// <param name="isItalic">true for an italic font type, false otherwise</param>
/// <param name="isUnderline">true for an underline font type, false otherwise</param>
public static void CreateBarLabels( GraphPane pane, bool isBarCenter, string valueFormat,
string fontFamily, float fontSize, Color fontColor, bool isBold, bool isItalic,
bool isUnderline )
{
bool isVertical = pane.BarSettings.Base == BarBase.X;
// keep a count of the number of BarItems
int curveIndex = 0;
// Get a valuehandler to do some calculations for us
ValueHandler valueHandler = new ValueHandler( pane, true );
// Loop through each curve in the list
foreach ( CurveItem curve in pane.CurveList )
{
// work with BarItems only
BarItem bar = curve as BarItem;
if ( bar != null )
{
IPointList points = curve.Points;
// ADD JKB 9/21/07
// The labelOffset should depend on whether the curve is YAxis or Y2Axis.
// JHC - Generalize to any value axis
// Make the gap between the bars and the labels = 1.5% of the axis range
float labelOffset;
Scale scale = curve.ValueAxis( pane ).Scale;
labelOffset = (float)( scale._max - scale._min ) * 0.015f;
// Loop through each point in the BarItem
for ( int i = 0; i < points.Count; i++ )
{
// Get the high, low and base values for the current bar
// note that this method will automatically calculate the "effective"
// values if the bar is stacked
double baseVal, lowVal, hiVal;
valueHandler.GetValues( curve, i, out baseVal, out lowVal, out hiVal );
// Get the value that corresponds to the center of the bar base
// This method figures out how the bars are positioned within a cluster
float centerVal = (float)valueHandler.BarCenterValue( bar,
bar.GetBarWidth( pane ), i, baseVal, curveIndex );
// Create a text label -- note that we have to go back to the original point
// data for this, since hiVal and lowVal could be "effective" values from a bar stack
string barLabelText = ( isVertical ? points[i].Y : points[i].X ).ToString( valueFormat );
// Calculate the position of the label -- this is either the X or the Y coordinate
// depending on whether they are horizontal or vertical bars, respectively
float position;
if ( isBarCenter )
position = (float)( hiVal + lowVal ) / 2.0f;
else if ( hiVal >= 0 )
position = (float)hiVal + labelOffset;
else
position = (float)hiVal - labelOffset;
// Create the new TextObj
TextObj label;
if ( isVertical )
label = new TextObj( barLabelText, centerVal, position );
else
label = new TextObj( barLabelText, position, centerVal );
label.FontSpec.Family = fontFamily;
// Configure the TextObj
// CHANGE JKB 9/21/07
// CoordinateFrame should depend on whether curve is YAxis or Y2Axis.
label.Location.CoordinateFrame =
(isVertical && curve.IsY2Axis) ? CoordType.AxisXY2Scale : CoordType.AxisXYScale;
label.FontSpec.Size = fontSize;
label.FontSpec.FontColor = fontColor;
label.FontSpec.IsItalic = isItalic;
label.FontSpec.IsBold = isBold;
label.FontSpec.IsUnderline = isUnderline;
label.FontSpec.Angle = isVertical ? 90 : 0;
label.Location.AlignH = isBarCenter ? AlignH.Center :
( hiVal >= 0 ? AlignH.Left : AlignH.Right );
label.Location.AlignV = AlignV.Center;
label.FontSpec.Border.IsVisible = false;
label.FontSpec.Fill.IsVisible = false;
// Add the TextObj to the GraphPane
pane.GraphObjList.Add( label );
}
curveIndex++;
}
}
}
/// <summary>
/// Draw this <see cref="CurveItem"/> to the specified <see cref="Graphics"/>
/// device as a symbol at each defined point. The routine
/// only draws the symbols; the lines are draw by the
/// <see cref="Line.DrawCurve"/> method. This method
/// is normally only called by the Draw method of the
/// <see cref="CurveItem"/> object
/// </summary>
/// <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 cref="GraphPane"/> object that is the parent or
/// owner of this object.
/// </param>
/// <param name="curve">A <see cref="LineItem"/> representing this
/// curve.</param>
/// <param name="scaleFactor">
/// The scaling factor to be used for rendering objects. This is calculated and
/// passed down by the parent <see cref="GraphPane"/> object using the
/// <see cref="PaneBase.CalcScaleFactor"/> method, and is used to proportionally adjust
/// font sizes, etc. according to the actual size of the graph.
/// </param>
/// <param name="isSelected">Indicates that the <see cref="Symbol" /> should be drawn
/// with attributes from the <see cref="Selection" /> class.
/// </param>
public void Draw( Graphics g, GraphPane pane, LineItem curve, float scaleFactor,
bool isSelected )
{
Symbol source = this;
if ( isSelected )
source = Selection.Symbol;
int tmpX, tmpY;
int minX = (int)pane.Chart.Rect.Left;
int maxX = (int)pane.Chart.Rect.Right;
int minY = (int)pane.Chart.Rect.Top;
int maxY = (int)pane.Chart.Rect.Bottom;
// (Dale-a-b) we'll set an element to true when it has been drawn
bool[,] isPixelDrawn = new bool[maxX + 1, maxY + 1];
double curX, curY, lowVal;
IPointList points = curve.Points;
if ( points != null && ( _border.IsVisible || _fill.IsVisible ) )
{
SmoothingMode sModeSave = g.SmoothingMode;
if ( _isAntiAlias )
g.SmoothingMode = SmoothingMode.HighQuality;
// For the sake of speed, go ahead and create a solid brush and a pen
// If it's a gradient fill, it will be created on the fly for each symbol
//SolidBrush brush = new SolidBrush( this.fill.Color );
using ( Pen pen = source._border.GetPen( pane, scaleFactor ) )
using ( GraphicsPath path = MakePath( g, scaleFactor ) )
{
RectangleF rect = path.GetBounds();
using ( Brush brush = source.Fill.MakeBrush( rect ) )
{
ValueHandler valueHandler = new ValueHandler( pane, false );
Scale xScale = curve.GetXAxis( pane ).Scale;
Scale yScale = curve.GetYAxis( pane ).Scale;
bool xIsLog = xScale.IsLog;
bool yIsLog = yScale.IsLog;
bool xIsOrdinal = xScale.IsAnyOrdinal;
double xMin = xScale.Min;
double xMax = xScale.Max;
// Loop over each defined point
for ( int i = 0; i < points.Count; i++ )
{
// Get the user scale values for the current point
// use the valueHandler only for stacked types
if ( pane.LineType == LineType.Stack )
{
valueHandler.GetValues( curve, i, out curX, out lowVal, out curY );
}
// otherwise, just access the values directly. Avoiding the valueHandler for
// non-stacked types is an optimization to minimize overhead in case there are
// a large number of points.
else
{
curX = points[i].X;
if ( curve is StickItem )
curY = points[i].Z;
else
curY = points[i].Y;
}
// Any value set to double max is invalid and should be skipped
// This is used for calculated values that are out of range, divide
// by zero, etc.
// Also, any value <= zero on a log scale is invalid
if ( curX != PointPair.Missing &&
curY != PointPair.Missing &&
!System.Double.IsNaN( curX ) &&
!System.Double.IsNaN( curY ) &&
!System.Double.IsInfinity( curX ) &&
!System.Double.IsInfinity( curY ) &&
( curX > 0 || !xIsLog ) &&
( !yIsLog || curY > 0.0 ) &&
( xIsOrdinal || ( curX >= xMin && curX <= xMax ) ) )
{
// Transform the user scale values to pixel locations
tmpX = (int) xScale.Transform( curve.IsOverrideOrdinal, i, curX );
tmpY = (int) yScale.Transform( curve.IsOverrideOrdinal, i, curY );
// Maintain an array of "used" pixel locations to avoid duplicate drawing operations
if ( tmpX >= minX && tmpX <= maxX && tmpY >= minY && tmpY <= maxY ) // guard against the zoom-in case
{
if ( isPixelDrawn[tmpX, tmpY] )
continue;
isPixelDrawn[tmpX, tmpY] = true;
}
// If the fill type for this symbol is a Gradient by value type,
// the make a brush corresponding to the appropriate current value
if ( _fill.IsGradientValueType || _border._gradientFill.IsGradientValueType )
{
using ( Brush tBrush = _fill.MakeBrush( rect, points[i] ) )
using ( Pen tPen = _border.GetPen( pane, scaleFactor, points[i] ) )
this.DrawSymbol( g, tmpX, tmpY, path, tPen, tBrush );
}
else
{
// Otherwise, the brush is already defined
// Draw the symbol at the specified pixel location
this.DrawSymbol( g, tmpX, tmpY, path, pen, brush );
}
}
}
}
}
g.SmoothingMode = sModeSave;
}
}
/// <summary>
/// Calculate the range for stacked bars and lines.
/// </summary>
/// <remarks>This method is required for the stacked
/// types because (for bars), the negative values are a separate stack than the positive
/// values. If you just sum up the bars, you will get the sum of the positive plus negative,
/// which is less than the maximum positive value and greater than the maximum negative value.
/// </remarks>
/// <param name="pane">
/// A reference to the <see cref="GraphPane"/> object that is the parent or
/// owner of this object.
/// </param>
/// <param name="curve">The <see cref="CurveItem"/> for which to calculate the range</param>
/// <param name="tXMinVal">The minimum X value so far</param>
/// <param name="tYMinVal">The minimum Y value so far</param>
/// <param name="tXMaxVal">The maximum X value so far</param>
/// <param name="tYMaxVal">The maximum Y value so far</param>
/// <seealso cref="GraphPane.IsBoundedRanges"/>
private void GetStackRange(GraphPane pane, CurveItem curve, out double tXMinVal,
out double tYMinVal, out double tXMaxVal, out double tYMaxVal)
{
// initialize the values to outrageous ones to start
tXMinVal = tYMinVal = Double.MaxValue;
tXMaxVal = tYMaxVal = Double.MinValue;
ValueHandler valueHandler = new ValueHandler(pane, false);
Axis baseAxis = curve.BaseAxis(pane);
bool isXBase = baseAxis is XAxis || baseAxis is X2Axis;
double lowVal, baseVal, hiVal;
for (int i = 0; i < curve.Points.Count; i++)
{
valueHandler.GetValues(curve, i, out baseVal, out lowVal, out hiVal);
double x = isXBase ? baseVal : hiVal;
double y = isXBase ? hiVal : baseVal;
if (x != PointPair.Missing && y != PointPair.Missing && lowVal != PointPair.Missing)
{
if (x < tXMinVal)
{
tXMinVal = x;
}
if (x > tXMaxVal)
{
tXMaxVal = x;
}
if (y < tYMinVal)
{
tYMinVal = y;
}
if (y > tYMaxVal)
{
tYMaxVal = y;
}
if (!isXBase)
{
if (lowVal < tXMinVal)
{
tXMinVal = lowVal;
}
if (lowVal > tXMaxVal)
{
tXMaxVal = lowVal;
}
}
else
{
if (lowVal < tYMinVal)
{
tYMinVal = lowVal;
}
if (lowVal > tYMaxVal)
{
tYMaxVal = lowVal;
}
}
}
}
}