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Donut Marks Position
Posted: Tue Dec 13, 2016 4:05 pm
by 16478065
Hello.
I use the following code to generate donuts. I have little room to generate my graph.
Code: Select all
TChart * Chart1 = new TChart(this);
Chart1->Parent = this;
Chart1->View3D = false;
Chart1->Width = 270;
Chart1->Height = 245;
TDonutSeries* serie = new TDonutSeries(Chart1);
serie->CustomXRadius = 47;
serie->CustomYRadius = serie->CustomXRadius;
serie->Legend->Visible = false;
serie->Add(82, UnicodeString("Protection \r\n sociale \r\n 82%"), clBlue);
serie->Add(1, UnicodeString("Avantages en \r\n nature \r\n 1%"), clRed);
serie->Add(17, UnicodeString("Revenu \r\n immédiat \r\n 17%"), clWhite);
Chart1->AddSeries(serie);
One of the marks is not positioning correctly. She leaves the panel, while she might be positioned elsewhere. I suspect that the positioning algorithm may not be easy to manage, but maybe you can improve it.
- Graph.png (10.79 KiB) Viewed 8483 times
Re: Donut Marks Position
Posted: Wed Dec 14, 2016 7:53 am
by yeray
Hello,
Indeed the antiovelap algorithm could be improved to better handle some situations. However the more complex the alrogirthm, slower it will be.
Have you tried using the TDragMarksTool to manually position your marks?
- Project3_2016-12-14_08-50-44.png (9.09 KiB) Viewed 8473 times
(I'm not sure why some programs show the
blue in that screenshot as
purple 
)
Re: Donut Marks Position
Posted: Wed Dec 14, 2016 8:29 am
by 16478065
Hello,
Thank you for your reply.
Your solution is interesting, but alas in our situation, the graphics are not visualized. They are generated, exported as an image and integrated into a document.
Using the TDragMarksTool is not possible.
Re: Donut Marks Position
Posted: Wed Dec 14, 2016 11:42 am
by yeray
Hello,
I've added it to the public tracker:
http://bugs.teechart.net/show_bug.cgi?id=1719
Also note here you can find proposed solutions for the marks overlapping:
http://www.teechart.net/support/viewtop ... lap#p29938
Re: Donut Marks Position
Posted: Wed Dec 14, 2016 12:14 pm
by yeray
Hello,
Here a simple example:
Code: Select all
uses Series, TeeDonut, TeeTools;
procedure TForm1.FormCreate(Sender: TObject);
var tmpRect: TRect;
begin
Chart1.View3D:=False;
Chart1.Legend.Visible:=False;
Chart1.Title.Visible:=False;
with Chart1.AddSeries(TDonutSeries) as TDonutSeries do
//with Chart1.AddSeries(TPieSeries) as TPieSeries do
begin
Add(82, 'Protection'+sLineBreak+'sociale'+sLineBreak+'82%', clBlue);
Add(1, 'Avantages en'+sLineBreak+'nature'+sLineBreak+'1%', clRed);
Add(17, 'Revenu'+sLineBreak+'immédiat'+sLineBreak+'17%', clWhite);
end;
Chart1.Tools.Add(TDragMarksTool);
AntiOverlap;
end;
procedure TForm1.AntiOverlap;
var R1,R2,DummyRect: TRect;
i, j: Integer;
mp1, mp2: TSeriesMarkPosition;
begin
Chart1[0].Marks.Automatic.Move:=false;
Chart1.Draw;
mp1:=TSeriesMarkPosition.Create;
mp2:=TSeriesMarkPosition.Create;
for i:=0 to Chart1[0].Count-1 do
begin
mp1:=Chart1[0].Marks.Positions.Position[i];
for j:=0 to Chart1[0].Count-1 do
begin
if (j<>i) then
begin
mp2:=Chart1[0].Marks.Positions.Position[j];
R1:=mp1.Bounds;
R2:=mp2.Bounds;
while (IntersectRect(DummyRect, R1, R2)) do
begin
mp1.Custom:=true;
mp1.LeftTop.x:=mp1.LeftTop.x+4;
mp1.LeftTop.y:=mp1.LeftTop.y+4;
mp1.ArrowTo.x:=mp1.LeftTop.x+4;
mp1.ArrowTo.y:=mp1.LeftTop.y+4;
R1:=mp1.Bounds;
R2:=mp2.Bounds;
end;
Chart1.Refresh;
end;
end;
end;
end;
It gives a better result, but you could probably improve the algorithm to better fit your needs.
- Project1_2016-12-14_13-12-03.png (9.69 KiB) Viewed 8456 times