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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.


              <canvas id='world'></canvas>


              body { background-color: #111111; }


              // forked from siouxcitizen's "canvasでloopで繰り返し矩形領域ぬりつぶし"
var ctx;
var xPos = 20;
var yPos = 37;
var jikiWidth = 30;
var jikiHeight = 30;
var tekiWidth = 30;
var tekiHeight = 30;
var tekiXPos = 20;
var tekiYPos = 0;
var gameEnd = false;
var jikiSpeed = 10;
var tekiSpeed = 5;

setInterval(loop, 100);

function init() {
  var canvas = document.getElementById('world');
  canvas.width = 450;
  canvas.height = 440;
  if ( ! canvas || ! canvas.getContext ) { return false; }
  document.addEventListener('keypress', handleKeyPress, false);
  ctx = canvas.getContext('2d');
  ctx.fillStyle = "#ff0000";
  ctx.fillRect(200, 370, jikiWidth , jikiHeight);
  ctx.fillStyle = "#0000ff";
  ctx.fillRect(200, 0, tekiWidth , tekiHeight);

function handleKeyPress(event) {
  if (event.keyCode==38) {//↑ボタン押下
    if (yPos > 0) {yPos--;}
  } else if (event.keyCode==40) {//↓ボタン押下
    if (yPos < 37) {yPos++;}
  } else if (event.keyCode==39) {//→ボタン押下
    if (xPos < 40) {xPos++;}
  } else if (event.keyCode==37) {//←ボタン押下
    if (xPos > 0) {xPos--;}

function loop() {
  if(gameEnd === true) {return;}
  ctx.fillStyle = "#ff0000";
  ctx.fillRect(jikiSpeed *xPos, jikiSpeed *yPos, jikiWidth, jikiHeight);
  ctx.fillStyle = "#0000ff";
  ctx.fillRect(200, tekiSpeed *tekiYPos, tekiWidth, tekiHeight);
  if (checkCollision()) {
    gameEnd = true;
    ctx.font = "20px 'Monotype Corsiva'";
    ctx.fillStyle = "#00ff00";
    ctx.fillText("矩形領域が衝突しました", 130, 40);
  if (tekiYPos > 88) {tekiYPos =0;}

function checkCollision() {
  var jikiCenterXPos = 10*xPos+jikiWidth/2;
  var jikiCenterYPos = 10*yPos+jikiHeight/2;
  var tekiCenterXPos = 200+tekiWidth/2;
  var tekiCenterYPos = 5*tekiYPos+tekiHeight/2;
  var dist = Math.sqrt(Math.pow((jikiCenterXPos-tekiCenterXPos),2) + Math.pow((jikiCenterYPos -tekiCenterYPos),2));
  if (dist<30) {return true;}