CODEWITHSUNDEEP
graphzedgraph
Stuart Whitehouse
Stuart Whitehouse

Reputation: 1441

Positioning ZedGraph legend at middle right not top right?

Is there some way to position the legend using ZedGraph so that it is on the right-hand side, but vertically centred. Using:

output.Legend.Position = ZedGraph.LegendPos.Right

positions the legend at the top right, but beside a pie chart this looks misaligned. Is there a way to get the legend to vertically centre? Changing output.Legend.Location.Y seems to have no effect, nor does trying output.Legend.Location.AlignV = ZedGraph.AlignV.Center

Added in response to first answer below...

Floating, reducing the chart size and positioning the label does centre vertically, and is better than I had managed previously. Unfortunately it has a side-effect, in that the legend switches to multi-column and tries to occupy half the width of the total chart area, thus usually overlapping the chart (see picture). Looking at the ZedGraph source, this wider mode is used for all layouts except Left and Right.

Multi-column legend

Upvotes: 1

Views: 3802

Answers (2)

Stuart Whitehouse
Stuart Whitehouse

Reputation: 1441

Anders' answer nearly worked, except it had the side-effect of changing the width of the legend. This led me to download the source code to find out why, and I discovered that the legend positioning code is actually quite trivial. LegendPos.Right is only referenced twice in the code, both times in Legend.CalcRect Adding a new LegendPos.MiddleRight only needs it added to the enum, a case for MiddleRight added to the first Switch which runs the same code as Right. And in the second Switch in CalcRect the following:

    case LegendPos.MiddleRight:
        newRect.X = clientRect.Right - totLegWidth;
        newRect.Y = tChartRect.Top + tChartRect.Height / 2 - totLegHeight / 2;
        tChartRect.Width -= totLegWidth + gapPix;
        break;

This is the same code as for LegendPos.Right except for the newRect.Y line.

Upvotes: 1

Anders Gustafsson
Anders Gustafsson

Reputation: 15981

Location is only enabled when Legend.Position is set to Float.

You could do like this (C#):

output.Legend.Position = LegendPos.Float;
output.Legend.Location = 
   new Location(1.05f, 0.5f, CoordType.ChartFraction, AlignH.Right, AlignV.Center);

with the probably undesired "feature" that the legend is drawn partially inside the chart:

Legend in chart

To workaround this issue I believe you also have to manually resize your chart:

output.Chart.Rect = new RectangleF(xstart, ystart, xsize, ysize);

Upvotes: 3

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