arc.js Example File

script/context2d/scripts/arc.js
var canvas = document.getElementById('tutorial');

  // Make sure we don't execute when canvas isn't supported
  if (canvas.getContext){

    // use getContext to use the canvas for drawing
    var ctx = canvas.getContext('2d');

    // Draw shapes
    for (i=0;i<4;i++){
      for(j=0;j<3;j++){
        ctx.beginPath();
        var x          = 25+j*50;               // x coordinate
        var y          = 25+i*50;               // y coordinate
        var radius     = 20;                    // Arc radius
        var startAngle = 0;                     // Starting point on circle
        var endAngle   = Math.PI+(Math.PI*j)/2; // End point on circle
        var clockwise  = i%2==0 ? false : true; // clockwise or anticlockwise

        ctx.arc(x,y,radius,startAngle,endAngle, clockwise);

        if (i>1){
          ctx.fill();
        } else {
          ctx.stroke();
        }
      }
    }

  }

© 2021 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.