delphi - Draw a pie chart with special properties (alter style and starting point) -

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i want create pie chart has features:

  • it's starting point changes 90 degree (like gauge component)
  • it turns clockwise.
  • a fixed marker shows value.
  • donut style.

i check pie chart properties. don't found corresponding feature.

i have teechart shipped delphi. it's v2011.03.32815. , don't have donut chart. think it's need coded. it' can done placing circle on it's canvas color matches chart background.

i can use gauge component. not have anti alias feature (teechart has teegdiplus ).

i've drawn illustrator of mean:
enter image description here

q1: how draw/code chart so?

here have simple example showing how use teechart draw tdonutseries similar 1 in picture. here how looks like: donut

and here code used generate it. it's tdonutseries 2 values , wide pen. , 2 tannotationtools texts:

uses tecanvas, teedonut, teetools, series;  procedure tform1.formcreate(sender: tobject); var donut1: tdonutseries;     annot1, annot2: tannotationtool;     tmpx, tmpy: integer; begin   (chart1.canvas tgdipluscanvas).antialiastext:=gpfbest;   chart1.view3d:=false;   chart1.legend.visible:=false;    chart1.foot   begin     text.text:='g1';     font.color:=clblack;     font.style:=[];     font.size:=25;   end;    donut1:=chart1.addseries(tdonutseries) tdonutseries;   annot1:=chart1.tools.add(tannotationtool) tannotationtool;   annot2:=chart1.tools.add(tannotationtool) tannotationtool;    donut1   begin     add(33, '', clwhite);     add(66, '', rgb(0, 178, 247));     pen.color:=rgb(0, 178, 247);     pen.width:=8;     rotationangle:=90;     marks.visible:=false;     customxradius:=120;     customyradius:=120;   end;    annot1   begin     text:='56%';     shape.transparent:=true;     shape.font.size:=25;   end;    annot2   begin     text:='33%';     shape.transparent:=true;     shape.font.size:=15;   end;    chart1.draw;    annot1   begin     shape.left:=donut1.circlexcenter-(shape.width div 2);     shape.top:=donut1.circleycenter-(shape.height div 2);   end;    annot2   begin     donut1.angletopos(180, donut1.customxradius, donut1.customyradius, tmpx, tmpy);     shape.left:=tmpx-(shape.width div 2)+30;     shape.top:=tmpy-(shape.height div 2)+30;   end; end;

if prefer use series marks instead of tannotationtools, try setting them follows:

  donut1.marks.transparent:=true;   donut1.marks.font.size:=20;   donut1.marks.callout.arrowhead:=ahsolid;

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