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oneko-ie6.js

@@ -0,0 +1,242 @@
+function neko() {
+  var nekoEl = document.createElement("div");
+
+  var nekoPosX = 32;
+  var nekoPosY = 32;
+
+  var mousePosX = 0;
+  var mousePosY = 0;
+
+  var frameCount = 0;
+  var idleTime = 0;
+  var idleAnimation = null;
+  var idleAnimationFrame = 0;
+  var direction;
+
+  var IE = document.all ? true : false;
+
+  var nekoSpeed = 10;
+  var spriteSets = {
+    idle: [[-3, -3]],
+    alert: [[-7, -3]],
+    scratchSelf: [
+      [-5, 0],
+      [-6, 0],
+      [-7, 0],
+    ],
+    scratchWallN: [
+      [0, 0],
+      [0, -1],
+    ],
+    scratchWallS: [
+      [-7, -1],
+      [-6, -2],
+    ],
+    scratchWallE: [
+      [-2, -2],
+      [-2, -3],
+    ],
+    scratchWallW: [
+      [-4, 0],
+      [-4, -1],
+    ],
+    tired: [[-3, -2]],
+    sleeping: [
+      [-2, 0],
+      [-2, -1],
+    ],
+    N: [
+      [-1, -2],
+      [-1, -3],
+    ],
+    NE: [
+      [0, -2],
+      [0, -3],
+    ],
+    E: [
+      [-3, 0],
+      [-3, -1],
+    ],
+    SE: [
+      [-5, -1],
+      [-5, -2],
+    ],
+    S: [
+      [-6, -3],
+      [-7, -2],
+    ],
+    SW: [
+      [-5, -3],
+      [-6, -1],
+    ],
+    W: [
+      [-4, -2],
+      [-4, -3],
+    ],
+    NW: [
+      [-1, 0],
+      [-1, -1],
+    ],
+  };
+  function init() {
+    nekoEl.id = "oneko";
+    nekoEl.ariaHidden = true;
+    nekoEl.style.width = "32px";
+    nekoEl.style.height = "32px";
+    nekoEl.style.position = "absolute";
+    nekoEl.style.pointerEvents = "none";
+    nekoEl.style.backgroundImage = "url('oneko.gif')";
+    nekoEl.style.imageRendering = "pixelated";
+    nekoEl.style.left = nekoPosX - 16 + "px";
+    nekoEl.style.top = nekoPosY - 16 + "px";
+    nekoEl.style.zIndex = Number.MAX_VALUE;
+
+    document.body.appendChild(nekoEl);
+    function mousePos(event) {
+      if (IE) {
+        event = window.event;
+      }
+      mousePosX = event.clientX;
+      mousePosY = event.clientY - 16;
+    }
+    document.onmousemove = mousePos;
+    window.onekoInterval = setInterval(frame, 100);
+  }
+
+  function setSprite(name, frame) {
+    var length = spriteSets[name].length;
+    if (IE) {
+      length = 0;
+      // Internet explorer is really fucking dumb
+      while (length < spriteSets[name].length) {
+        if (spriteSets[name][length] != null) {
+          length = length + 1;
+          continue;
+        }
+        break;
+      }
+    }
+    var sprite = spriteSets[name][frame % length];
+    nekoEl.style.backgroundPosition =
+      sprite["0"] * 32 + "px " + sprite["1"] * 32 + "px";
+  }
+
+  function resetIdleAnimation() {
+    idleAnimation = null;
+    idleAnimationFrame = 0;
+  }
+
+  function idle() {
+    idleTime = idleTime + 1;
+
+    // every ~ 20 seconds
+    if (
+      idleTime > 10 &&
+      Math.floor(Math.random() * 200) == 0 &&
+      idleAnimation == null
+    ) {
+      var avalibleIdleAnimations = ["sleeping", "scratchSelf"];
+      if (nekoPosX < 32) {
+        avalibleIdleAnimations.push("scratchWallW");
+      }
+      if (nekoPosY < 32) {
+        avalibleIdleAnimations.push("scratchWallN");
+      }
+      if (nekoPosX > window.innerWidth - 32) {
+        avalibleIdleAnimations.push("scratchWallE");
+      }
+      if (nekoPosY > window.innerHeight - 32) {
+        avalibleIdleAnimations.push("scratchWallS");
+      }
+      idleAnimation =
+        avalibleIdleAnimations[
+          Math.floor(Math.random() * avalibleIdleAnimations.length)
+        ];
+    }
+
+    switch (idleAnimation) {
+      case "sleeping":
+        if (idleAnimationFrame < 8) {
+          setSprite("tired", 0);
+          break;
+        }
+        setSprite("sleeping", Math.floor(idleAnimationFrame / 4));
+        if (idleAnimationFrame > 192) {
+          resetIdleAnimation();
+        }
+        break;
+      case "scratchWallN":
+      case "scratchWallS":
+      case "scratchWallE":
+      case "scratchWallW":
+      case "scratchSelf":
+        setSprite(idleAnimation, idleAnimationFrame);
+        if (idleAnimationFrame > 9) {
+          resetIdleAnimation();
+        }
+        break;
+      default:
+        setSprite("idle", 0);
+        return;
+    }
+    idleAnimationFrame = idleAnimationFrame + 1;
+  }
+
+  function frame() {
+    frameCount = frameCount + 1;
+    var diffX = nekoPosX - mousePosX;
+    var diffY = nekoPosY - mousePosY;
+    var distance = Math.sqrt(Math.pow(diffX, 2) + Math.pow(diffY, 2));
+
+    if (distance < nekoSpeed || distance < 48) {
+      idle();
+      return;
+    }
+
+    idleAnimation = null;
+    idleAnimationFrame = 0;
+
+    if (idleTime > 1) {
+      setSprite("alert", 0);
+      // count down after being alerted before moving
+      idleTime = Math.min(idleTime, 7);
+      idleTime = idleTime - 1;
+      return;
+    }
+
+    direction = "";
+    if (diffY / distance > 0.5) {
+      direction = "N";
+    } else if (diffY / distance < -0.5) {
+      direction = "S";
+    }
+    if (diffX / distance > 0.5) {
+      direction = direction + "W";
+    } else if (diffX / distance < -0.5) {
+      direction = direction + "E";
+    }
+    setSprite(direction, frameCount);
+
+    if (distance > nekoSpeed) {
+      nekoPosX = nekoPosX - (diffX / distance) * nekoSpeed;
+      nekoPosY = nekoPosY - (diffY / distance) * nekoSpeed;
+    } else {
+      nekoPosX = mousePosX;
+      nekoPosY = mousePosY;
+    }
+
+    nekoPosX = Math.min(
+      Math.max(16, nekoPosX),
+      document.getElementsByTagName("body")[0].clientWidth - 16
+    );
+    nekoPosY = Math.min(
+      Math.max(16, nekoPosY),
+      document.getElementsByTagName("body")[0].clientHeight - 16
+    );
+
+    nekoEl.style.left = nekoPosX - 16 + "px";
+    nekoEl.style.top = nekoPosY - 16 + "px";
+  }
+  init();
+}
+neko();