/// <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 );
float scaledSize = _bar.Symbol.Size * pane.CalcScaleFactor();
// 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 - scaledSize / 2.0F;
// Draw the bar
if ( baseAxis is XAxis || baseAxis is X2Axis )
coords = String.Format( "{0:f0},{1:f0},{2:f0},{3:f0}",
pixSide, pixLowVal,
pixSide + scaledSize, pixHiVal );
else
coords = String.Format( "{0:f0},{1:f0},{2:f0},{3:f0}",
pixLowVal, pixSide,
pixHiVal, pixSide + scaledSize );
return true;
}
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;
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>
/// Calculate the width of each bar, depending on the actual bar type
/// </summary>
/// <returns>The width for an individual bar, in pixel units</returns>
public float GetBarWidth( GraphPane pane )
{
// Total axis width =
// npts * ( nbars * ( bar + bargap ) - bargap + clustgap )
// cg * bar = cluster gap
// npts = max number of points in any curve
// nbars = total number of curves that are of type IsBar
// bar = bar width
// bg * bar = bar gap
// therefore:
// totwidth = npts * ( nbars * (bar + bg*bar) - bg*bar + cg*bar )
// totwidth = bar * ( npts * ( nbars * ( 1 + bg ) - bg + cg ) )
// solve for bar
float barWidth;
if ( this is ErrorBarItem )
barWidth = (float) ( ((ErrorBarItem)this).Bar.Symbol.Size *
pane.CalcScaleFactor() );
// else if ( this is HiLowBarItem && pane._barSettings.Type != BarType.ClusterHiLow )
// barWidth = (float) ( ((HiLowBarItem)this).Bar.GetBarWidth( pane,
// ((HiLowBarItem)this).BaseAxis(pane), pane.CalcScaleFactor() ) );
// barWidth = (float) ( ((HiLowBarItem)this).Bar.Size *
// pane.CalcScaleFactor() );
else // BarItem or LineItem
{
// For stacked bar types, the bar width will be based on a single bar
float numBars = 1.0F;
if ( pane._barSettings.Type == BarType.Cluster )
numBars = pane.CurveList.NumClusterableBars;
float denom = numBars * ( 1.0F + pane._barSettings.MinBarGap ) -
pane._barSettings.MinBarGap + pane._barSettings.MinClusterGap;
if ( denom <= 0 )
denom = 1;
barWidth = pane.BarSettings.GetClusterWidth() / denom;
}
if ( barWidth <= 0 )
return 1;
return barWidth;
}
/// <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 );
float halfSize = _stick.Size * pane.CalcScaleFactor();
PointPair pt = _points[i];
double date = pt.X;
double high = pt.Y;
double low = pt.Z;
if ( !pt.IsInvalid3D &&
( date > 0 || !baseAxis._scale.IsLog ) &&
( ( high > 0 && low > 0 ) || !valueAxis._scale.IsLog ) )
{
float pixBase, pixHigh, pixLow;
pixBase = baseAxis.Scale.Transform( _isOverrideOrdinal, i, date );
pixHigh = valueAxis.Scale.Transform( _isOverrideOrdinal, i, high );
pixLow = valueAxis.Scale.Transform( _isOverrideOrdinal, i, low );
// Calculate the pixel location for the side of the bar (on the base axis)
float pixSide = pixBase - halfSize;
// Draw the bar
if ( baseAxis is XAxis || baseAxis is X2Axis )
coords = String.Format( "{0:f0},{1:f0},{2:f0},{3:f0}",
pixSide, pixLow,
pixSide + halfSize * 2, pixHigh );
else
coords = String.Format( "{0:f0},{1:f0},{2:f0},{3:f0}",
pixLow, pixSide,
pixHigh, pixSide + halfSize * 2 );
return true;
}
return false;
}