/// <summary>
/// Create a URL for a <see cref="CurveItem" /> that includes the index of the
/// point that was selected.
/// </summary>
/// <remarks>
/// An "index" parameter is added to the <see cref="Url" /> property for this
/// link to indicate which point was selected. Further, if the
/// X or Y axes that correspond to this <see cref="CurveItem" /> are of
/// <see cref="AxisType.Text" />, then an
/// additional parameter will be added containing the text value that
/// corresponds to the <paramref name="index" /> of the selected point.
/// The <see cref="XAxis" /> text parameter will be labeled "xtext", and
/// the <see cref="YAxis" /> text parameter will be labeled "ytext".
/// </remarks>
/// <param name="index">The zero-based index of the selected point</param>
/// <param name="pane">The <see cref="GraphPane" /> of interest</param>
/// <param name="curve">The <see cref="CurveItem" /> for which to
/// make the url string.</param>
/// <returns>A string containing the url with an index parameter added.</returns>
public virtual string MakeCurveItemUrl( GraphPane pane, CurveItem curve, int index )
{
string url = _url;
if ( url.IndexOf( '?' ) >= 0 )
url += "&index=" + index.ToString();
else
url += "?index=" + index.ToString();
Axis xAxis = curve.GetXAxis( pane );
if ( xAxis.Type == AxisType.Text && index >= 0 &&
xAxis.Scale.TextLabels != null &&
index <= xAxis.Scale.TextLabels.Length )
url += "&xtext=" + xAxis.Scale.TextLabels[index];
Axis yAxis = curve.GetYAxis( pane );
if ( yAxis != null && yAxis.Type == AxisType.Text && index >= 0 &&
yAxis.Scale.TextLabels != null &&
index <= yAxis.Scale.TextLabels.Length )
url += "&ytext=" + yAxis.Scale.TextLabels[index];
return url;
}
/// <summary>
/// Find the data point that lies closest to the specified mouse (screen)
/// point.
/// </summary>
/// <remarks>
/// This method will search through all curves in
/// <see cref="GraphPane.CurveList"/> to find which point is
/// nearest. It will only consider points that are within
/// <see cref="Default.NearestTol"/> pixels of the screen point.
/// </remarks>
/// <param name="mousePt">The screen point, in pixel coordinates.</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,
out CurveItem nearestCurve, out int iNearest )
{
return FindNearestPoint( mousePt, _curveList,
out nearestCurve, out iNearest );
}
/// <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>
/// The Copy Constructor
/// </summary>
/// <param name="rhs">The CurveItem object from which to copy</param>
public CurveItem( CurveItem rhs )
{
_label = rhs._label.Clone();
_isY2Axis = rhs.IsY2Axis;
_isX2Axis = rhs.IsX2Axis;
_isVisible = rhs.IsVisible;
_isOverrideOrdinal = rhs._isOverrideOrdinal;
_yAxisIndex = rhs._yAxisIndex;
if ( rhs.Tag is ICloneable )
this.Tag = ((ICloneable) rhs.Tag).Clone();
else
this.Tag = rhs.Tag;
_points = (IPointList) rhs.Points.Clone();
_link = rhs._link.Clone();
}
/// <summary>
/// Find the data point that lies closest to the specified mouse (screen)
/// point for the specified curve.
/// </summary>
/// <remarks>
/// This method will search only through the points for the specified
/// curve to determine which point is
/// nearest the mouse point. It will only consider points that are within
/// <see cref="Default.NearestTol"/> pixels of the screen point.
/// </remarks>
/// <param name="mousePt">The screen point, in pixel coordinates.</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="targetCurve">A <see cref="CurveItem"/> object containing
/// the data points to be searched.</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, CurveItem targetCurve,
out CurveItem nearestCurve, out int iNearest )
{
CurveList targetCurveList = new CurveList();
targetCurveList.Add( targetCurve );
return FindNearestPoint( mousePt, targetCurveList,
out nearestCurve, out iNearest );
}
//public static Color SelectedSymbolColor = Color.Gray;
#endregion Other
#if ( DOTNET1 )
// Define a "Contains" method so that this class works with .Net 1.1 or 2.0
internal bool Contains( CurveItem item )
{
foreach ( CurveItem ci in this )
if ( item == ci )
return true;
return false;
}
/// <summary>
/// Add a <see cref="CurveItem" /> to the selection list.
/// </summary>
/// <param name="master">The <see cref="MasterPane" /> that is the "owner"
/// of the <see cref="CurveItem" />'s.</param>
/// <param name="ci">The <see cref="CurveItem" /> to be added to the list.</param>
public void AddToSelection( MasterPane master, CurveItem ci )
{
if ( this.Contains( ci ) == false )
Add( ci );
UpdateSelection( master );
}
/// <summary>
/// Place a <see cref="CurveItem" /> in the selection list, removing all other
/// items.
/// </summary>
/// <param name="master">The <see cref="MasterPane" /> that is the "owner"
/// of the <see cref="CurveItem" />'s.</param>
/// <param name="ci">The <see cref="CurveItem" /> to be added to the list.</param>
public void Select( MasterPane master, CurveItem ci )
{
//Clear the selection, but don't send the event,
//the event will be sent in "AddToSelection" by calling "UpdateSelection"
ClearSelection( master, false );
AddToSelection( master, ci );
}
/// <summary>
/// Remove the specified <see cref="CurveItem" /> from the selection list.
/// </summary>
/// <param name="master">The <see cref="MasterPane" /> that is the "owner"
/// of the <see cref="CurveItem" />'s.</param>
/// <param name="ci">The <see cref="CurveItem" /> to be removed from the list.</param>
public void RemoveFromSelection( MasterPane master, CurveItem ci )
{
if ( this.Contains( ci ) )
this.Remove( ci );
UpdateSelection( master );
}
/// <summary>
/// Get the user scale values associate with a particular point of a
/// particular curve.</summary>
/// <remarks>The main purpose of this method is to handle
/// stacked bars and lines, in which case the stacked values are returned rather
/// than the individual data values. However, this method works generically for any
/// curve type.
/// </remarks>
/// <param name="pane">The parent <see cref="GraphPane"/> object.</param>
/// <param name="curve">A <see cref="CurveItem"/> object of interest.</param>
/// <param name="iPt">The zero-based point index for the point of interest.</param>
/// <param name="baseVal">A <see cref="Double"/> value representing the value
/// for the independent axis.</param>
/// <param name="lowVal">A <see cref="Double"/> value representing the lower
/// value for the dependent axis.</param>
/// <param name="hiVal">A <see cref="Double"/> value representing the upper
/// value for the dependent axis.</param>
/// <returns>true if the data point is value, false for
/// <see cref="PointPairBase.Missing"/>, invalid, etc. data.</returns>
public static bool GetValues( GraphPane pane, CurveItem curve, int iPt,
out double baseVal, out double lowVal, out double hiVal )
{
hiVal = PointPair.Missing;
lowVal = PointPair.Missing;
baseVal = PointPair.Missing;
if ( curve == null || curve.Points.Count <= iPt || !curve.IsVisible )
return false;
Axis baseAxis = curve.BaseAxis( pane );
Axis valueAxis = curve.ValueAxis( pane );
if ( baseAxis is XAxis || baseAxis is X2Axis )
baseVal = curve.Points[iPt].X;
else
baseVal = curve.Points[iPt].Y;
// is it a stacked bar type?
if ( curve is BarItem && ( pane._barSettings.Type == BarType.Stack ||
pane._barSettings.Type == BarType.PercentStack ) )
{
double positiveStack = 0;
double negativeStack = 0;
double curVal;
// loop through all the curves, summing up the values to get a total (only
// for the current ordinal position iPt)
foreach ( CurveItem tmpCurve in pane.CurveList )
{
// Sum the value for the current curve only if it is a bar
if ( tmpCurve.IsBar && tmpCurve.IsVisible )
{
curVal = PointPair.Missing;
// For non-ordinal curves, find a matching base value (must match exactly)
if ( curve.IsOverrideOrdinal || !baseAxis._scale.IsAnyOrdinal )
{
IPointList points = tmpCurve.Points;
for ( int i=0; i<points.Count; i++ )
{
if ( ( baseAxis is XAxis || baseAxis is X2Axis ) && points[i].X == baseVal )
{
curVal = points[i].Y;
break;
}
else if ( !(baseAxis is XAxis || baseAxis is X2Axis) && points[i].Y == baseVal )
{
curVal = points[i].X;
break;
}
}
}
// otherwise, it's an ordinal type so use the value at the same ordinal position
else if ( iPt < tmpCurve.Points.Count )
{
// Get the value for the appropriate value axis
if ( baseAxis is XAxis || baseAxis is X2Axis )
curVal = tmpCurve.Points[iPt].Y;
else
curVal = tmpCurve.Points[iPt].X;
}
// If it's a missing value, skip it
if ( curVal == PointPair.Missing )
{
positiveStack = PointPair.Missing;
negativeStack = PointPair.Missing;
}
// the current curve is the target curve, save the summed values for later
if ( tmpCurve == curve )
{
// if the value is positive, use the positive stack
if ( curVal >= 0 )
{
lowVal = positiveStack;
hiVal = ( curVal == PointPair.Missing || positiveStack == PointPair.Missing ) ?
PointPair.Missing : positiveStack + curVal;
}
// otherwise, use the negative stack
else
{
hiVal = negativeStack;
lowVal = ( curVal == PointPair.Missing || negativeStack == PointPair.Missing ) ?
PointPair.Missing : negativeStack + curVal;
}
}
// Add all positive values to the positive stack, and negative values to the
// negative stack
if ( curVal >= 0 )
positiveStack = ( curVal == PointPair.Missing || positiveStack == PointPair.Missing ) ?
PointPair.Missing : positiveStack + curVal;
else
negativeStack = ( curVal == PointPair.Missing || negativeStack == PointPair.Missing ) ?
PointPair.Missing : negativeStack + curVal;
}
}
// if the curve is a PercentStack type, then calculate the percent for this bar
// based on the total height of the stack
if ( pane._barSettings.Type == BarType.PercentStack &&
hiVal != PointPair.Missing && lowVal != PointPair.Missing )
{
// Use the total magnitude of the positive plus negative bar stacks to determine
// the percentage value
positiveStack += Math.Abs( negativeStack );
// just to avoid dividing by zero...
if ( positiveStack != 0 )
{
// calculate the percentage values
lowVal = lowVal / positiveStack * 100.0;
hiVal = hiVal / positiveStack * 100.0;
}
else
{
lowVal = 0;
hiVal = 0;
}
}
if ( baseVal == PointPair.Missing || lowVal == PointPair.Missing ||
hiVal == PointPair.Missing )
return false;
else
return true;
}
// If the curve is a stacked line type, then sum up the values similar to the stacked bar type
else if ( curve is LineItem && pane.LineType == LineType.Stack )
{
double stack = 0;
double curVal;
// loop through all the curves, summing up the values to get a total (only
// for the current ordinal position iPt)
foreach ( CurveItem tmpCurve in pane.CurveList )
{
// make sure the curve is a Line type
if ( tmpCurve is LineItem && tmpCurve.IsVisible )
{
curVal = PointPair.Missing;
// For non-ordinal curves, find a matching base value (must match exactly)
if ( curve.IsOverrideOrdinal || !baseAxis._scale.IsAnyOrdinal )
{
IPointList points = tmpCurve.Points;
for ( int i = 0; i < points.Count; i++ )
{
if ( points[i].X == baseVal )
{
curVal = points[i].Y;
break;
}
}
}
// otherwise, it's an ordinal type so use the value at the same ordinal position
else if ( iPt < tmpCurve.Points.Count )
{
// For line types, the Y axis is always the value axis
curVal = tmpCurve.Points[iPt].Y;
}
// if the current value is missing, then the rest of the stack is missing
if ( curVal == PointPair.Missing )
stack = PointPair.Missing;
// if the current curve is the target curve, save the values
if ( tmpCurve == curve )
{
lowVal = stack;
// if ( curVal < 0 && stack == 0 )
// {
// stack = curVal;
// lowVal = curVal;
// hiVal = curVal;
// }
// else
hiVal = ( curVal == PointPair.Missing || stack == PointPair.Missing ) ?
PointPair.Missing : stack + curVal;
}
// sum all the curves to a single total. This includes both positive and
// negative values (unlike the bar stack type).
stack = ( curVal == PointPair.Missing || stack == PointPair.Missing ) ?
PointPair.Missing : stack + curVal;
}
}
if ( baseVal == PointPair.Missing || lowVal == PointPair.Missing ||
hiVal == PointPair.Missing )
return false;
else
return true;
}
// otherwise, the curve is not a stacked type (not a stacked bar or stacked line)
else
{
if ( ! (curve is HiLowBarItem) )
lowVal = 0;
else
lowVal = curve.Points[iPt].LowValue;
if ( baseAxis is XAxis || baseAxis is X2Axis )
hiVal = curve.Points[iPt].Y;
else
hiVal = curve.Points[iPt].X;
}
// Special Exception: Bars on log scales should always plot from the Min value upwards,
// since they can never be zero
if ( curve is BarItem && valueAxis._scale.IsLog && lowVal == 0 )
lowVal = valueAxis._scale._min;
if ( baseVal == PointPair.Missing || hiVal == PointPair.Missing ||
( lowVal == PointPair.Missing && ( curve is ErrorBarItem ||
curve is HiLowBarItem ) ) )
return false;
else
return true;
}
/// <summary>
/// Get the user scale values associate with a particular point of a
/// particular curve.</summary>
/// <remarks>The main purpose of this method is to handle
/// stacked bars, in which case the stacked values are returned rather
/// than the individual data values.
/// </remarks>
/// <param name="curve">A <see cref="CurveItem"/> object of interest.</param>
/// <param name="iPt">The zero-based point index for the point of interest.</param>
/// <param name="baseVal">A <see cref="Double"/> value representing the value
/// for the independent axis.</param>
/// <param name="lowVal">A <see cref="Double"/> value representing the lower
/// value for the dependent axis.</param>
/// <param name="hiVal">A <see cref="Double"/> value representing the upper
/// value for the dependent axis.</param>
/// <returns>true if the data point is value, false for
/// <see cref="PointPairBase.Missing"/>, invalid, etc. data.</returns>
public bool GetValues( CurveItem curve, int iPt, out double baseVal,
out double lowVal, out double hiVal )
{
return GetValues( _pane, curve, iPt, out baseVal,
out lowVal, out hiVal );
}
/// <summary>
/// Calculate the user scale position of the center of the specified bar, using the
/// <see cref="Axis"/> as specified by <see cref="BarSettings.Base"/>. This method is
/// used primarily by the
/// <see cref="GraphPane.FindNearestPoint(PointF,out CurveItem,out int)"/> method in order to
/// determine the bar "location," which is defined as the center of the top of the individual bar.
/// </summary>
/// <param name="curve">The <see cref="CurveItem"/> representing the
/// bar of interest.</param>
/// <param name="barWidth">The width of each individual bar. This can be calculated using
/// the <see cref="CurveItem.GetBarWidth"/> method.</param>
/// <param name="iCluster">The cluster number for the bar of interest. This is the ordinal
/// position of the current point. That is, if a particular <see cref="CurveItem"/> has
/// 10 points, then a value of 3 would indicate the 4th point in the data array.</param>
/// <param name="val">The actual independent axis value for the bar of interest.</param>
/// <param name="iOrdinal">The ordinal position of the <see cref="CurveItem"/> of interest.
/// That is, the first bar series is 0, the second is 1, etc. Note that this applies only
/// to the bars. If a graph includes both bars and lines, then count only the bars.</param>
/// <returns>A user scale value position of the center of the bar of interest.</returns>
public double BarCenterValue( CurveItem curve, float barWidth, int iCluster,
double val, int iOrdinal )
{
Axis baseAxis = curve.BaseAxis( _pane );
if ( curve is ErrorBarItem || curve is HiLowBarItem ||
curve is OHLCBarItem || curve is JapaneseCandleStickItem )
{
if ( baseAxis._scale.IsAnyOrdinal && iCluster >= 0 && !curve.IsOverrideOrdinal )
return (double) iCluster + 1.0;
else
return val;
}
else
{
float clusterWidth = _pane._barSettings.GetClusterWidth();
float clusterGap = _pane._barSettings.MinClusterGap * barWidth;
float barGap = barWidth * _pane._barSettings.MinBarGap;
if ( curve.IsBar && _pane._barSettings.Type != BarType.Cluster )
iOrdinal = 0;
float centerPix = baseAxis.Scale.Transform( curve.IsOverrideOrdinal, iCluster, val )
- clusterWidth / 2.0F + clusterGap / 2.0F +
iOrdinal * ( barWidth + barGap ) + 0.5F * barWidth;
return baseAxis.Scale.ReverseTransform( centerPix );
}
}
