frontend/worldhardestgame2/js/mouse.js

function getMousePos(evt) {
  var rect = canvasElement.getBoundingClientRect();
  return {
      x: evt.clientX - rect.left,
      y: evt.clientY - rect.top
  };
}

canvasElement.addEventListener("mousemove", function(evt) {
  var mousePos = getMousePos(evt);
mouseX = mousePos.x;
  mouseY = mousePos.y;
}, false);

canvasElement.addEventListener("mousedown", function(evt) {
  mouseDown = true;
  clickButtons();
}, false);

canvasElement.addEventListener("mouseup", function(evt) {
  mouseDown = false;
}, false);

// not called in mobile version
function resetMouse() {
if (justClicked) {
      justClicked = false;
  }
  else if (cursorType == 1) {
      $("#twhgCanvas").css("cursor", "auto");
      cursorType = 0;
  }
}