/// <summary>
/// Creates an image of a barchart which represents the data in <paramref name="barChartData"/>. The image is saved at <paramref name="completeFileName"/>.
/// </summary>
/// <param name="completeFileName">The path at which to save the generated image.</param>
/// <param name="barChartData">The <year, value> plots for the barchart.</param>
/// <returns>True on success, false on fail.</returns>
private bool CreateBarChartImageFile( string completeFileName, SortedDictionary<int, double> barChartData )
{
if( Thread.CurrentThread.GetApartmentState() != ApartmentState.STA )
{
return this.InvokeCreateBarChartImageFile( completeFileName, barChartData );
}
try
{
const string fontFamily = "Times New Roman";
const float fontSize = 12f;
ZedGraphControl chart = new ZedGraphControl();
chart.Size = new Size( ( barChartData.Count + 2 ) * 45, 300 );
GraphPane pane = chart.GraphPane;
pane.IsFontsScaled = false;
pane.BarSettings.Type = BarType.Stack;
pane.Chart.Fill = new Fill( Color.Transparent );
pane.Fill = new Fill( Color.LightBlue, Color.AliceBlue, 90F );
pane.Title.FontSpec.Family = fontFamily;
pane.Title.FontSpec.Size = fontSize;
pane.Title.IsVisible = false;
pane.Title.Text = string.Empty;
pane.XAxis.MajorGrid.IsVisible = false;
pane.XAxis.MajorTic.IsInside = false;
pane.XAxis.Scale.FontSpec.Family = fontFamily;
pane.XAxis.Scale.FontSpec.Size = fontSize;
pane.XAxis.Title.FontSpec.Family = fontFamily;
pane.XAxis.Title.FontSpec.Size = fontSize;
pane.XAxis.Title.IsVisible = false;
pane.XAxis.Title.Text = string.Empty;
pane.X2Axis.IsVisible = false;
pane.X2Axis.MajorGrid.IsVisible = false;
pane.X2Axis.MinorGrid.IsVisible = false;
pane.X2Axis.MajorTic.IsInside = false;
pane.X2Axis.MajorTic.IsOutside = false;
pane.X2Axis.MinorTic.IsInside = false;
pane.X2Axis.MinorTic.IsOutside = false;
pane.YAxis.MajorGrid.IsVisible = true;
pane.YAxis.MajorGrid.Color = Color.LightSteelBlue;
pane.YAxis.MajorTic.IsInside = false;
pane.YAxis.MinorTic.IsInside = false;
pane.YAxis.MinorTic.IsOutside = false;
pane.YAxis.Scale.FontSpec.Family = fontFamily;
pane.YAxis.Scale.FontSpec.Size = fontSize;
pane.YAxis.Title.FontSpec.Family = fontFamily;
pane.YAxis.Title.FontSpec.Size = fontSize;
pane.YAxis.Title.IsVisible = false;
pane.YAxis.Title.Text = string.Empty;
pane.Y2Axis.IsVisible = false;
pane.Y2Axis.MajorGrid.IsVisible = false;
pane.Y2Axis.MinorGrid.IsVisible = false;
pane.Y2Axis.MajorTic.IsInside = false;
pane.Y2Axis.MajorTic.IsOutside = false;
pane.Y2Axis.MinorTic.IsInside = false;
pane.Y2Axis.MinorTic.IsOutside = false;
int idx = 0;
string[] labels = new string[ barChartData.Count ];
PointPairList nPoints = new PointPairList();
PointPairList pPoints = new PointPairList();
foreach( KeyValuePair<int, double> yearValue in barChartData )
{
int yr = yearValue.Key % 100;
labels[ idx ] = "'" + yr.ToString( "00" );
double value = yearValue.Value * 100;
if( yearValue.Value >= 0 )
{
nPoints.Add( yearValue.Key, 0.0 );
pPoints.Add( yearValue.Key, value );
}
else
{
nPoints.Add( yearValue.Key, value );
pPoints.Add( yearValue.Key, 0.0 );
}
idx++;
}
pane.XAxis.Scale.TextLabels = labels;
pane.XAxis.Type = AxisType.Text;
//negative values
BarItem nBar = pane.AddBar( string.Empty, nPoints, Color.Empty );
nBar.Bar.Fill = new Fill( Color.FromArgb( 227, 99, 52 ), Color.FromArgb( 255, 177, 126 ), Color.FromArgb( 227, 99, 52 ) );
//positive values
BarItem pBar = pane.AddBar( string.Empty, pPoints, Color.Empty );
pBar.Bar.Fill = new Fill( Color.FromArgb( 81, 148, 157 ), Color.FromArgb( 107, 197, 222 ), Color.FromArgb( 81, 148, 157 ) );
//1 - Update the chart with the series
chart.AxisChange();
//2 - Process the value labels for each point
this.WriteValueLabels( pane, nBar, fontFamily, fontSize, true );
this.WriteValueLabels( pane, pBar, fontFamily, fontSize, false );
//3 - Update the chart again
chart.AxisChange();
using( Image img = chart.GetImage() )
{
EncoderParameters parms = new EncoderParameters( 1 );
EncoderParameter parm = new EncoderParameter( System.Drawing.Imaging.Encoder.Quality, 80L );
parms.Param[ 0 ] = parm;
ImageCodecInfo jgpEncoder = GetEncoder( ImageFormat.Jpeg );
img.Save( completeFileName, jgpEncoder, parms );
}
try
{
chart.Dispose();
chart = null;
}
catch { }
return true;
}
catch { }
return false;
}
