legend filled when it is not supposed to

David Novo · Post by **David Novo** » Fri Dec 16, 2005 11:42 pm

Hello,

I have created an area series that has a no fill, and only the hatch marks from the fill are visible. This worked out just great.

Problem is that in the legend, a background color is coming up. So even though the series is red hatched lines on a clear background, in the legend it is coming up as black lines on a red background.

here is a picture

Is there a property I can set to make the legend symbol look like the plot?

The code for the form is below:

object Form1: TForm1
Left = 325
Top = 110
Width = 334
Height = 287
Caption = 'Form1'
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'MS Sans Serif'
Font.Style = []
OldCreateOrder = False
PixelsPerInch = 96
TextHeight = 13
object Chart1: TChart
Left = 8
Top = 8
Width = 313
Height = 233
Legend.Brush.Color = clWhite
Legend.Brush.Style = bsClear
Legend.LegendStyle = lsSeries
Title.Text.Strings = (
'TChart')
View3D = False
TabOrder = 0
object Series2: TAreaSeries
Marks.Callout.Brush.Color = clBlack
Marks.Visible = False
SeriesColor = clRed
AreaBrush = bsDiagCross
AreaChartBrush.Color = clNone
AreaChartBrush.Style = bsDiagCross
AreaColor = clRed
AreaLinesPen.Visible = False
DrawArea = True
Pointer.InflateMargins = True
Pointer.Style = psRectangle
Pointer.Visible = False
XValues.Name = 'X'
XValues.Order = loAscending
YValues.Name = 'Y'
YValues.Order = loNone
end
end
end

Narcís · Post by **Narcís** » Mon Dec 19, 2005 9:38 am

Hi David,

I've been able to reproduce this issue and added it to our defect list (TV52011128) to be fixed for future releases.

David Novo · Post by **David Novo** » Wed Dec 21, 2005 7:58 am

Thanks for the prompt reply.

I will be glad to modify the source myself, I have done so many times myself, if you can quickly point me to the method that actually draws the shape in the legend.

Narcís · Post by **Narcís** » Wed Dec 21, 2005 9:45 am

Hi David,

I'd say it's on TLegendSymbol.Draw method at Chart.pas.

David Novo · Post by **David Novo** » Wed Dec 21, 2005 11:26 pm

Hello,

As far as I can tell, it seems that someone has forgotten to override the TChartSeries.legendItemColor method for an Area Series. The default behaviour in TChartSeries is to use the seriesColor, but for areaSeries, the seriesColor is not necessarily used.

So I think that will work for this bug, however, since the AreaBrush is introduced in tCustomSeries, I think the checking for the legend color (depending on the area brush) should be done at that level. However, that code is complicated, so I will leave that for the experts....

David Novo · Post by **David Novo** » Thu Dec 22, 2005 12:18 am

Unfortunately, its actually a bit of a mess. In different parts of the code, different pens and brushes are being used to draw the area and draw the legend for the area.

I am thoroughly confused because the brushes and pens get set over and over again

However, I think that if I create my own AreaSeries and override prepareLegendCanvas, I should be okay.