topical media & game development

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graphic-canvas-example-clock.js / js



  function init(){
    clock();
    setInterval(clock,1000);
  }
  function clock(){
    var now = new Date();
    var ctx = document.getElementById('canvas').getContext('2d');
    ctx.save();
    ctx.clearRect(0,0,150,150);
    ctx.translate(75,75);
    ctx.scale(0.4,0.4);
    ctx.rotate(-Math.PI/2);
    ctx.strokeStyle = "black";
    ctx.fillStyle = "white";
    ctx.lineWidth = 8;
    ctx.lineCap = "round";
  
    // Hour marks
    ctx.save();
    for (i=0;i<12;i++){
      ctx.beginPath();
      ctx.rotate(Math.PI/6);
      ctx.moveTo(100,0);
      ctx.lineTo(120,0);
      ctx.stroke();
    }
    ctx.restore();
  
    // Minute marks
    ctx.save();
    ctx.lineWidth = 5;
    for (i=0;i<60;i++){
      if (i%5!=0) {
        ctx.beginPath();
        ctx.moveTo(117,0);
        ctx.lineTo(120,0);
        ctx.stroke();
      }
      ctx.rotate(Math.PI/30);
    }
    ctx.restore();
    
    var sec = now.getSeconds();
    var min = now.getMinutes();
    var hr  = now.getHours();
    hr = hr>=12 ? hr-12 : hr;
  
    ctx.fillStyle = "black";
  
    // write Hours
    ctx.save();
    ctx.rotate( hr*(Math.PI/6) + (Math.PI/360)*min + (Math.PI/21600)*sec )
    ctx.lineWidth = 14;
    ctx.beginPath();
    ctx.moveTo(-20,0);
    ctx.lineTo(80,0);
    ctx.stroke();
    ctx.restore();
  
    // write Minutes
    ctx.save();
    ctx.rotate( (Math.PI/30)*min + (Math.PI/1800)*sec )
    ctx.lineWidth = 10;
    ctx.beginPath();
    ctx.moveTo(-28,0);
    ctx.lineTo(112,0);
    ctx.stroke();
    ctx.restore();
    
    // Write seconds
    ctx.save();
    ctx.rotate(sec * Math.PI/30);
    ctx.strokeStyle = "#D40000";
    ctx.fillStyle = "#D40000";
    ctx.lineWidth = 6;
    ctx.beginPath();
    ctx.moveTo(-30,0);
    ctx.lineTo(83,0);
    ctx.stroke();
    ctx.beginPath();
    ctx.arc(0,0,10,0,Math.PI*2,true);
    ctx.fill();
    ctx.beginPath();
    ctx.arc(95,0,10,0,Math.PI*2,true);
    ctx.stroke();
    ctx.fillStyle = "#555";
    ctx.arc(0,0,3,0,Math.PI*2,true);
    ctx.fill();
    ctx.restore();
  
    ctx.beginPath();
    ctx.lineWidth = 14;
    ctx.strokeStyle = '#325FA2';
    ctx.arc(0,0,142,0,Math.PI*2,true);
    ctx.stroke();
  
    ctx.restore();
  }
  


(C) Æliens 20/2/2008

You may not copy or print any of this material without explicit permission of the author or the publisher. In case of other copyright issues, contact the author.