Qt 4.8: clock.js Example File (script/context2d/scripts/clock.js)

Qt Reference Documentation

- Qt 4.8
- ALL VERSIONS

- A
- A
- A
- Print

# clock.js Example File

script/context2d/scripts/clock.js

     function init(){
       clock();
       setInterval('clock()',1000);
     }
     function clock(){
       var now = new Date();
       var ctx = document.getElementById('tutorial').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();
       ctx.beginPath();
       for (i=0;i<12;i++){
         ctx.rotate(Math.PI/6);
         ctx.moveTo(100,0);
         ctx.lineTo(120,0);
       }
       ctx.stroke();
       ctx.restore();

       // Minute marks
       ctx.save();
       ctx.lineWidth = 5;
       ctx.beginPath();
       for (i=0;i<60;i++){
         if (i%5!=0) {
           ctx.moveTo(117,0);
           ctx.lineTo(120,0);
         }
         ctx.rotate(Math.PI/30);
       }
       ctx.stroke();
       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();
     }
     init();