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Kreisdiagramm

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Kreisdiagramm

 

Ein Kreisdiagramm zu zeichnen ist weniger schwer als man vermuten möchte. Mit ein wenig Javascript werden die vorgegebenen Werte durchlaufen und in die einzelnen Kuchenstücke umgerechnet.

 

 

let colorArr = ["#125e37","#FFF0A5","#FFB03B","#B64926","#8E2800","#338855","#ff0000","#ff00ff"];
let pieData = [20,70,60,280,27,64,230,80];
let sectorAngleArr = [];
let total = 0;
let startAngle = 0;
let endAngle = 0;
let radius = 80;
let x = 100;
let y = 100;
let x1,x2,y1,y2 = 0;
let p;
 
function init(){
   p = document.getElementById("svg1");
   // RECHNE ALLE WERTE ZUSAMMEN
   // CALCULATE THE TOTAL
   for(let k=0; k < pieData.length; k++){
      total += pieData[k];
   }
   // BERECHNUNG DER WINKEL, DIE JEDER SEKTOR EINNIMMT, UND IN ARRAY SPEICHERN
   // CALCULATE THE ANGLES THAT EACH SECTOR SWIPES AND STORE IN AN ARRAY
   for(let i=0; i < pieData.length; i++){
      let angle = (360 * pieData[i] / total);
      sectorAngleArr.push(angle);
   }
   drawArcs();
}
 
function drawArcs(){
 
   let d = '';
   let d2 = '';
   let endline = 0;
   let ta = '';
 
   for(let i=0; i < sectorAngleArr.length; i++){
      startAngle = endAngle;
      endAngle = startAngle + sectorAngleArr[i];
 
      x1 = (x + radius * Math.cos(Math.PI * startAngle / 180));
      y1 = (y + radius * Math.sin(Math.PI * startAngle / 180));
 
      x2 = (x + radius * Math.cos(Math.PI * endAngle / 180));
      y2 = (y + radius * Math.sin(Math.PI * endAngle / 180));         
 
      d = "M"+x+","+y+" L"+x1+","+y1+" A"+radius+","+radius+" 0 0,1 "+x2+","+y2+" z"; // 1 MEANS CLOCKWISE
 
      p.innerHTML = p.innerHTML + "<path d='"+d+"' style='fill:"+colorArr[i]+"; stroke-width:1px; stroke:#000; opacity:1;'></path>";
   }
}

 

Mit ein paar Modifikationen kann auch noch für jedes Kuchenstück ein Beschreibungstext hinzugefügt werden.

 

Jetzt sollte das Diagramm so aussehen.

SonstigeRollschuheSagwayAutoPferdSchlittenMotoradBoot

 

Hier noch mal der komplette Code

let startAngle = 0;
let endAngle = 0;
let colorArr = ["#125e37","#FFF0A5","#FFB03B","#B64926","#8E2800","#338855","#ff0000","#ff00ff"];
let pieData = [20,70,60,280,27,64,230,80];
let pieTextData = ["Sonstige","Rollschuhe","Sagway","Auto","Pferd","Schlitten","Motorad","Boot"];
let sectorAngleArr = [];
let total = 0;
let radius = 80;
let radius2 = 110;
let x = 150;
let y = 150;
let p;
 
function init(){
   p = document.getElementById("svg1");
   // RECHNE ALLE WERTE ZUSAMMEN
   // CALCULATE THE TOTAL
   for(let k=0; k < pieData.length; k++){
      total += pieData[k];
   }
   // BERECHNUNG DER WINKEL, DIE JEDER SEKTOR EINNIMMT, UND IN ARRAY SPEICHERN
   // CALCULATE THE ANGLES THAT EACH SECTOR SWIPES AND STORE IN AN ARRAY
   for(let i=0; i < pieData.length; i++){
      let angle = (360 * pieData[i] / total);
      sectorAngleArr.push(angle);
   }
   drawArcs();
}
 
function drawArcs(){
 
   let d = '';
   let d2 = '';
   let endline = 0;
   let ta = '';
 
   for(let i=0; i < sectorAngleArr.length; i++){
      startAngle = endAngle;
      endAngle = startAngle + sectorAngleArr[i];
 
      lineAngle = startAngle + sectorAngleArr[i] / 2;
 
      let x1 = (x + radius * Math.cos(Math.PI * startAngle / 180));
      let y1 = (y + radius * Math.sin(Math.PI * startAngle / 180));
 
      let x2 = (x + radius * Math.cos(Math.PI * endAngle / 180));
      let y2 = (y + radius * Math.sin(Math.PI * endAngle / 180));
 
      let x3 = (x + radius * Math.cos(Math.PI * lineAngle / 180));
      let y3 = (y + radius * Math.sin(Math.PI * lineAngle / 180));
 
      let x4 = (x + radius2 * Math.cos(Math.PI * lineAngle / 180));
      let y4 = (y + radius2 * Math.sin(Math.PI * lineAngle / 180));
 
      d = "M"+x+","+y+" L" + x1 + "," + y1 + " A" + radius + "," + radius + " 0 0,1 " + x2 + "," + y2 + " z"; // 1 means clockwise
 
      // Da nur 8 Farben vorgegeben sind: i Modulo 8 ( colorer[i%8] )
      p.innerHTML = p.innerHTML + "<path d='"+d+"' style='fill:"+colorArr[i%8]+";stroke-width:.5;stroke:#000;opacity:1;'></path>";
 
      if( lineAngle > 90 && lineAngle < 270 ){
         d2 = "M"+x3+","+y3+" "+x4+","+y4+" h -20";
         endline = -25;
         ta = "end";
      }else{
         d2 = "M"+x3+","+y3+" "+x4+","+y4+" h 20";
         endline = 25;
         ta = "start";
      }
      p.innerHTML = p.innerHTML + "<path d='"+d2+"' style='fill:none; stroke-width:.5;stroke:#000;'></path>";
      p.innerHTML = p.innerHTML + "<text x='"+(x4+endline)+"' y='"+(y4+5)+"' text-anchor='"+ta+"'>"+pieTextData[i]+"</text>";
   }
}