HangoutAppTest/SimpleApp.xml at master · JPII/HangoutAppTest · GitHub

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<?xml version="1.0" encoding="UTF-8" ?>
<Module>
<!-- Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License
-->
        <ModulePrefs title="Send Message">
                <Require feature="rpc" />
                <Require feature="views" />
                <Require feature="locked-domain" />
        </ModulePrefs>
        <Content type="html"><![CDATA[

<html>
<style type="text/css">
<!--
.button {
  border-radius: 3px;
  -moz-border-radius: 3px;
  background: -webkit-gradient(linear, left top, left bottom, from(#fff), to(#ddd));
  background: -moz-linear-gradient(top, #fff, #ddd);
  border: 1px solid #bbb;
}
.button:active {
        background: -webkit-gradient(linear, left top, left bottom, from(#aaa), to(#333));
        background: -moz-linear-gradient(bottom, #ddd, #aaa); }
#wrap {
    width:800px;
    margin:0 auto;
    background:#EEEEEE;
}
#main {
    float:left;
    width:300px;
    margin:0 auto;
    background:#FFFFFF;
}
#text {
    float:right;
    width:400px;
    margin-left:20px;
    background:#FFFFFF;
}

-->
</style>

<script src="https://talkgadget.google.com/hangouts/_/api/hangout.js?v=1.2" ></script>

<div id="wrap">
    <h2>JPII Hangout App Test</h2>
    <div id="main">
        <canvas id="canvas" width='300' height='300'></canvas><br/>

            <p>Choose a color: <span style="width:50px;height:50px;border:1px solid #000; background:#0F0" onClick='setColor("#0F0")'>G</span>
            <span style="width:50px;height:50px;border:1px solid #000; background:#F00" onClick='setColor("#F00")'>R</span>
            <span style="width:50px;height:50px;border:1px solid #000; background:#00F" onClick='setColor("#00F")'>B</span>
            <span style="width:50px;height:50px;border:1px solid #000; background:#FFF" onClick='setColor("#FFF")'>W</span></p>

        <div id="eventsSent"></div><br/>

        <input type='button' class='button' value='Reset picture' onClick='initColorBoxes()'></input>
    </div>
<!--
    <div id='text'>
        <h2>What am I seeing?</h2>

        <p>This application demonstrates the Hangouts API <b>message data channel</b>.
        In this data model, you can send rapid, small updates to other participants running the same
        application.  We are <i>not</i> using shared state.</p>

        <p>Mousing over the grid will use <tt>sendMessage</tt> to indicate which square you are over and what color you have chosen.</p>

        <p>Note that some messages may be dropped, especially if your application sends lots of them at once.  This app is locked to a maximum of
        30 messages per second to avoid overloading the channel.</p>
    </div>
-->
</div>

<script>
// Keep track of how many messages were sent
var messageLastSeen = {};
var myMessageCount = 0;
var missedMessages = 0;

// Various constants for width and height
var tileSide = 5;
var pixelWidth = 300;
var pixelHeight = 300;
var tileWidth = pixelWidth / tileSide;
var tileHeight = pixelHeight / tileSide;

// Holds all our tile colors
var tileColor = [];

// Current drawing color
var currentColor = '#F00';

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

/** Button callback for selecting a color
 * @param {string} value a hex color.
 */
function setColor(value) {
    currentColor = value;
}

// Keep track of where the mouse is and whether it's moved across a grid.
var mouseDirty = false;
var lastTileX, lastTileY;

/** Draws the tile grid.
 * @param {context} context a canvas 2d context.
 */
function render(context) {
  context.fillStyle = '#000';
  context.fillRect(0, 0, pixelWidth, pixelHeight);

  for (var j = 0; j < tileWidth; j++) {
    for (var i = 0; i < tileHeight; i++) {
      var color = tileColor[i][j];

      context.fillStyle = color;
      context.fillRect(i * tileSide + 1,
                       j * tileSide + 1,
                       tileSide - 2,
                       tileSide - 2);
    }
  }
}

/** Move mouse
 * @param {number} x x coordinate.
 * @param {number} y y coordinate.
 */
function mouseMove(x, y) {
    // Only one update per frame.
    if (mouseDirty) {
        return;
    }

    var tileX = Math.floor(x / tileSide);
    var tileY = Math.floor(y / tileSide);

    mouseDirty = (tileX != lastTileX || tileY != lastTileY);

    // Only color if you've moved a significant amount.
    if (mouseDirty) {
        tileColor[tileX][tileY] = currentColor;

        lastTileX = tileX;
        lastTileY = tileY;
    }
}

/** Standard requestAnimFrame; see paulirish.com */
window.requestAnimFrame = (
    function(callback) {
      return window.requestAnimationFrame ||
          window.webkitRequestAnimationFrame ||
          window.mozRequestAnimationFrame ||
          window.oRequestAnimationFrame ||
          window.msRequestAnimationFrame ||
          function(callback) {
            window.setTimeout(callback, 1);
          };
    })();

/** Draw canvas once per frame. */
function animate() {
  // draw
  var canvas = document.getElementById('canvas');

  render(canvas.getContext('2d'));
  // request new frame
  requestAnimFrame(function() {
    animate();
    // Send a message if you've moved.
    if (mouseDirty) {
      myMessageCount++;
      gapi.hangout.data.sendMessage(
          JSON.stringify([myMessageCount,
                          currentColor,
                          lastTileX,
                          lastTileY]));
      mouseDirty = false;
    }
  });
}

/** Builds our grid of colors */
function initColorBoxes() {
  tileColor = [];
  for (var i = 0; i < tileWidth; i++) {
    var row = [];
    for (var j = 0; j < tileHeight; j++) {
      row.push('#FFF');
    }
    tileColor.push(row);
  }
}

/** Draw missing packets, if packets are missing. */
function showLossRates() {
  var div = document.getElementById('eventsSent');
  var retVal = 'Missed messages: ' + missedMessages;

  div.innerHTML = retVal;
}

var missedPackets = 0;

/** Count any dropped packages.  Compare incoming message count
 * to the number of messages we've seen; any discrepancy counts
 * as one miss.
 * @param {string} senderid Participant id of sender.
 * @param {number} messageid last number send.
 */
function droppedPackageCount(senderid, messageid) {
  if (messageLastSeen[senderid] != messageid - 1) {
    missedPackets++;
  }
  messageLastSeen[senderid] = messageid;

  console.log('message id = ' + messageid);
}

/** Get a message.
 * @param {MessageReceievedEvent} event An event.
 */
function onMessageReceived(event) {
  try {
    var data = JSON.parse(event.message);

    tileColor[data[2]][data[3]] = data[1];
    droppedPackageCount(event.senderId, parseInt(data[0]));
    showLossRates();
  } catch (e) {
    console.log(e);
  }
}

/** Kick off the app. */
function init() {
  // When API is ready...
  gapi.hangout.onApiReady.add(
      function(eventObj) {
        if (eventObj.isApiReady) {
          try {
            gapi.hangout.data.onMessageReceived.add(onMessageReceived);

            document.getElementById('canvas').onmousemove = function(e) {
              var ev = e || window.event;
              mouseMove(ev.clientX - canvas.offsetLeft,
                        ev.clientY - canvas.offsetTop);
            };

            initColorBoxes();
            animate();
          } catch (e) {
            console.log('init:ERROR');
            console.log(e);
          }
        }
      });
}


// Wait for gadget to load.
gadgets.util.registerOnLoadHandler(init);
</script>
</body>
]]>
</Content>
</Module>