个回答

• llyne

  2016-08-26 18:09:17

  // JavaScript Document

  //window.width =1024;

  //window.height =768;

  //窗口的处理更加的方便

  /*

  var WINDOW_WIDTH =1024;

  var WINDOW_HEIGHT =768;

  var RADIUS =8;

  var MARGIN_LEFT =30;

  var MARGIN_TOP =60;

  const endTime =new Date("2016-07-26 18:20:30");

  var curShowTimeSeconds =0;

  
  

  window.onload = function(){

  var canvas =document.getElementById("canvas");

  var context =canvas.getContext("2d");

  canvas.width =WINDOW_WIDTH;

  canvas.height =WINDOW_HEIGHT;

  curShowTimeSeconds =getCurrentShowTimeSeconds();

  render( context );//绘制当前的canvas函数的画布

  }

  function getCurrentShowTimeSeconds(){

  var curTime =new Date();

  var ret =endTime.getTime()-curTime.getTime();

  ret =Math.round(ret/1000);//换算成秒并且取整

  return ret>0?ret :0;

  }

  
  

  
  

  function render( cxt ){

  var hours =parseInt(curShowTimeSeconds/3600);

  var minutes =parseInt((curShowTimeSeconds-hours*3600)/60);

  var seconds =curShowTimeSeconds%60;

  renderDigit(MARGIN_LEFT,MARGIN_TOP,parseInt(hours/10),cxt);

  renderDigit(MARGIN_LEFT+15*(RADIUS+1),MARGIN_TOP,parseInt(hours%10),cxt);

  renderDigit(MARGIN_LEFT+30*(RADIUS+1),MARGIN_TOP,10,cxt);

      renderDigit(MARGIN_LEFT+39*(RADIUS+1),MARGIN_TOP,parseInt(minutes/10),cxt);

  renderDigit(MARGIN_LEFT+54*(RADIUS+1),MARGIN_TOP,parseInt(minutes%10),cxt);

  renderDigit(MARGIN_LEFT+69*(RADIUS+1),MARGIN_TOP,10,cxt);

  renderDigit(MARGIN_LEFT+78*(RADIUS+1),MARGIN_TOP,parseInt(seconds/10),cxt);

  renderDigit(MARGIN_LEFT+93*(RADIUS+1),MARGIN_TOP,parseInt(seconds%10),cxt);

      

     

  }

  
  

  
  

  function renderDigit(x,y,num,cxt){

  cxt.fillStyle ="rgb(0,102,153)";

  for (var i =0;i<digit[num].length;i++)

  for (var j=0;j<digit[num][i].length;j++)

  if(digit[num][i][j]==1)

  {

  cxt.beginPath();

  cxt.arc(x+j*2*(RADIUS+1)+(RADIUS+1),y+i*2*(RADIUS+1)+(RADIUS+1),RADIUS,0,2*Math.PI);

  cxt.closePath();

  cxt.fill();

  }

  }

  */

  var WINDOW_WIDTH = 1024;

  var WINDOW_HEIGHT = 768;

  var RADIUS = 8;

  var MARGIN_TOP = 60;

  var MARGIN_LEFT = 30;

  
  

  const endTime = new Date(2016,7,26,22,47,52);

  var curShowTimeSeconds = 0

  
  

  window.onload = function(){

  
  

      var canvas = document.getElementById('canvas');

      var context = canvas.getContext("2d");

  
  

      canvas.width = WINDOW_WIDTH;

      canvas.height = WINDOW_HEIGHT;

  
  

      curShowTimeSeconds = getCurrentShowTimeSeconds()

      render( context )

  }

  
  

  function getCurrentShowTimeSeconds() {

      var curTime = new Date();

      var ret = endTime.getTime() - curTime.getTime();

      ret = Math.round( ret/1000 )

  
  

      return ret >= 0 ? ret : 0;

  }

  
  

  function render( cxt ){

  
  

      var hours = parseInt( curShowTimeSeconds / 3600);

      var minutes = parseInt( (curShowTimeSeconds - hours * 3600)/60 )

      var seconds = curShowTimeSeconds % 60

  
  

      renderDigit( MARGIN_LEFT , MARGIN_TOP , parseInt(hours/10) , cxt )

      renderDigit( MARGIN_LEFT + 15*(RADIUS+1) , MARGIN_TOP , parseInt(hours%10) , cxt )

      renderDigit( MARGIN_LEFT + 30*(RADIUS + 1) , MARGIN_TOP , 10 , cxt )

      renderDigit( MARGIN_LEFT + 39*(RADIUS+1) , MARGIN_TOP , parseInt(minutes/10) , cxt);

      renderDigit( MARGIN_LEFT + 54*(RADIUS+1) , MARGIN_TOP , parseInt(minutes%10) , cxt);

      renderDigit( MARGIN_LEFT + 69*(RADIUS+1) , MARGIN_TOP , 10 , cxt);

      renderDigit( MARGIN_LEFT + 78*(RADIUS+1) , MARGIN_TOP , parseInt(seconds/10) , cxt);

      renderDigit( MARGIN_LEFT + 93*(RADIUS+1) , MARGIN_TOP , parseInt(seconds%10) , cxt);

  }

  
  

  function renderDigit( x , y , num , cxt ){

  
  

      cxt.fillStyle = "rgb(0,102,153)";

  
  

      for( var i = 0 ; i < digit[num].length ; i ++ )

          for(var j = 0 ; j < digit[num][i].length ; j ++ )

              if( digit[num][i][j] == 1 ){

                  cxt.beginPath();

                  cxt.arc( x+j*2*(RADIUS+1)+(RADIUS+1) , y+i*2*(RADIUS+1)+(RADIUS+1) , RADIUS , 0 , 2*Math.PI )

                  cxt.closePath()

  
  

                  cxt.fill()

              }

  }

  
  

  
  

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