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Snake Coding Fast Demo, watch https://youtu.be/xGmXxpIj6vs

a guest May 5th, 2017 93,644 Never
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  1. <canvas id="gc" width="400" height="400"></canvas>
  2. <script>
  3. window.onload=function() {
  4.     canv=document.getElementById("gc");
  5.     ctx=canv.getContext("2d");
  6.     document.addEventListener("keydown",keyPush);
  7.     setInterval(game,1000/15);
  8. }
  9. px=py=10;
  10. gs=tc=20;
  11. ax=ay=15;
  12. xv=yv=0;
  13. trail=[];
  14. tail = 5;
  15. function game() {
  16.     px+=xv;
  17.     py+=yv;
  18.     if(px<0) {
  19.         px= tc-1;
  20.     }
  21.     if(px>tc-1) {
  22.         px= 0;
  23.     }
  24.     if(py<0) {
  25.         py= tc-1;
  26.     }
  27.     if(py>tc-1) {
  28.         py= 0;
  29.     }
  30.     ctx.fillStyle="black";
  31.     ctx.fillRect(0,0,canv.width,canv.height);
  32.  
  33.     ctx.fillStyle="lime";
  34.     for(var i=0;i<trail.length;i++) {
  35.         ctx.fillRect(trail[i].x*gs,trail[i].y*gs,gs-2,gs-2);
  36.         if(trail[i].x==px && trail[i].y==py) {
  37.             tail = 5;
  38.         }
  39.     }
  40.     trail.push({x:px,y:py});
  41.     while(trail.length>tail) {
  42.     trail.shift();
  43.     }
  44.  
  45.     if(ax==px && ay==py) {
  46.         tail++;
  47.         ax=Math.floor(Math.random()*tc);
  48.         ay=Math.floor(Math.random()*tc);
  49.     }
  50.     ctx.fillStyle="red";
  51.     ctx.fillRect(ax*gs,ay*gs,gs-2,gs-2);
  52. }
  53. function keyPush(evt) {
  54.     switch(evt.keyCode) {
  55.         case 37:
  56.             xv=-1;yv=0;
  57.             break;
  58.         case 38:
  59.             xv=0;yv=-1;
  60.             break;
  61.         case 39:
  62.             xv=1;yv=0;
  63.             break;
  64.         case 40:
  65.             xv=0;yv=1;
  66.             break;
  67.     }
  68. }
  69. </script>
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