How to make an animation by replacing images

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There is a game browser on the internet that has a feature that I found interesting and would like to know how to do it.

Asyoucanseeinthefigure,therearesomebuildings,someobjectsandsomepeople!Lookinglikethislookslikeareadyimage,howeveranyiteminthisimagehasinteraction!Itendsupbecomingan"interactive" image (it does not appear, but the mouse is on the "Office" and as you can see the office in question stands out!), How do you do that?

Being more specific, I would like to know how to do this manipulation of images, reading the source code of the site to understand that everything is done with a simple manipulation of several images "building" one, but I'm not sure that it is this, and even if it is how it is done? Because it's as if you're specifying "altitude and longitude" for each image. What I would have to do then to reproduce this practice, whether with the same images or others!

I would like to learn this practice to create a mini-map, similar to this one, but with my own images!

    
asked by anonymous 16.02.2015 / 02:23

1 answer

7

You can use API Canvas to change the images giving the impression of movement, build maps, and use all javascript / html5 features to give your images interactivity

Look at this example, a coin spinning from a single image divided into frames, I commented the lines that give life to the code! 

// Copyright 2013 William Malone (www.williammalone.com)
//
// 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.

(function() {
  // http://paulirish.com/2011/requestanimationframe-for-smart-animating/
  // http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating
  // requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel
  // MIT license

  var lastTime = 0;
  var vendors = ['ms', 'moz', 'webkit', 'o'];
  for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
    window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
    window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame'] || window[vendors[x] + 'CancelRequestAnimationFrame'];
  }

  if (!window.requestAnimationFrame)
    window.requestAnimationFrame = function(callback, element) {
      var currTime = new Date().getTime();
      var timeToCall = Math.max(0, 16 - (currTime - lastTime));
      var id = window.setTimeout(function() {
          callback(currTime + timeToCall);
        },
        timeToCall);
      lastTime = currTime + timeToCall;
      return id;
    };

  if (!window.cancelAnimationFrame)
    window.cancelAnimationFrame = function(id) {
      clearTimeout(id);
    };
}());

(function() {

  var coin,
    coinImage,
    canvas;

  function gameLoop() {

    window.requestAnimationFrame(gameLoop);

    coin.update();
    coin.render();
  }

  // Função prepara
  function sprite(options) {

    // inicializando configuração
    var that = {},
      frameIndex = 0,
      tickCount = 0,
      ticksPerFrame = options.ticksPerFrame || 0,
      numberOfFrames = options.numberOfFrames || 1;

    // onde objeto vai ser desenhado 
    that.context = options.context;
    // Largura
    that.width = options.width;
    // altura
    that.height = options.height;
    // objeto que recebe a imagem
    that.image = options.image;

    that.update = function() {

      tickCount += 1;

      if (tickCount > ticksPerFrame) {

        tickCount = 0;

        //verifica se é chegou a ultima imagem
        if (frameIndex < numberOfFrames - 1) {
          // avança proxima imagem
          frameIndex += 1;
        } else {
          // retorna a posição inicial
          frameIndex = 0;
        }
      }
    };

    that.render = function() {

      // Clear the canvas
      that.context.clearRect(0, 0, that.width, that.height);

      // Draw the animation
      that.context.drawImage(
        that.image,
        frameIndex * that.width / numberOfFrames,
        0,
        that.width / numberOfFrames,
        that.height,
        0,
        0,
        that.width / numberOfFrames,
        that.height);
    };

    return that;
  }

  // pega o elemento que vamos tornar um obj canvas
  canvas = document.getElementById("coinAnimation");
  canvas.width = 100;
  canvas.height = 100;

  // cria um um objeto para receber as imagem
  coinImage = new Image();

  // Inicializa um objeto canvas
  coin = sprite({
    context: canvas.getContext("2d"),
    width: 1000,
    height: 100,
    image: coinImage,
    numberOfFrames: 10,
    ticksPerFrame: 4
  });

  // Carrega Roteiro da imagem
  coinImage.addEventListener("load", gameLoop);
  coinImage.src = "http://www.williammalone.com/articles/create-html5-canvas-javascript-sprite-animation/downloads/sprite-animation-demo/images/coin-sprite-animation.png";

}());
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><html><head><title>SpriteAnimationDemo</title></head><body><canvasid="coinAnimation"></canvas>
  <script src="sprite-animation-demo.js"></script>
</body>

</html>

(View / Execute the code !!)

See the full article , The article will show you how to make one game using that coin.

Your question was how to draw a mini-map similar to what you showed, in this next example you will be able to have N elements organized in vectorized map using canvas 

// Define variables
var tilesetImage = new Image();
tilesetImage.src = 'http://sklambert.com/php/phpThumb/phpThumb.php?src=background.png&w=512';
tilesetImage.onload = drawImage;

var canvas = document.getElementById('main');
var ctx = canvas.getContext('2d');
var tileSize = 32; // The size of a tile (32x32)
var rowTileCount = 20; // The number of tiles in a row of our background
var colTileCount = 32; // The number of tiles in a column of our background
var imageNumTiles = 16; // The number of tiles per row in the tileset image

// The tileset arrays
var ground = [
  [172, 172, 172, 79, 34, 34, 34, 34, 34, 34, 34, 34, 56, 57, 54, 55, 56, 147, 67, 67, 68, 79, 79, 171, 172, 172, 173, 79, 79, 55, 55, 55],
  [172, 172, 172, 79, 34, 34, 34, 34, 34, 34, 146, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 155, 142, 172, 159, 189, 79, 79, 55, 55, 55],
  [172, 172, 172, 79, 79, 34, 34, 34, 34, 34, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 171, 172, 159, 189, 79, 79, 79, 55, 55, 55],
  [188, 188, 188, 79, 79, 79, 79, 34, 34, 34, 36, 172, 172, 143, 142, 157, 79, 79, 79, 79, 79, 79, 187, 159, 189, 79, 79, 79, 55, 55, 55, 55],
  [79, 79, 79, 79, 79, 79, 79, 79, 34, 34, 36, 172, 159, 158, 172, 143, 157, 79, 79, 79, 79, 79, 79, 79, 79, 79, 39, 51, 51, 51, 55, 55],
  [79, 79, 79, 79, 79, 79, 79, 79, 79, 34, 36, 172, 143, 142, 172, 172, 143, 157, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 55],
  [79, 79, 79, 79, 79, 79, 79, 79, 79, 34, 52, 172, 172, 172, 172, 172, 172, 143, 156, 157, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79],
  [79, 79, 79, 79, 79, 79, 79, 79, 79, 34, 52, 172, 172, 172, 172, 172, 172, 159, 188, 189, 79, 79, 79, 79, 79, 171, 172, 172, 173, 79, 79, 79],
  [79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 188, 158, 172, 172, 172, 172, 173, 79, 79, 79, 79, 79, 79, 79, 187, 158, 159, 189, 79, 79, 79],
  [79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 171, 172, 172, 159, 188, 189, 79, 79, 79, 79, 79, 79, 79, 79, 171, 173, 79, 79, 79, 79],
  [79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 171, 172, 172, 173, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 171, 173, 79, 79, 79, 79],
  [155, 142, 157, 79, 79, 79, 79, 79, 79, 79, 79, 79, 187, 188, 188, 189, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 171, 173, 79, 79, 79, 79],
  [171, 172, 173, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 171, 173, 79, 79, 79, 79],
  [171, 172, 143, 156, 157, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 187, 189, 79, 79, 79, 79],
  [187, 188, 158, 172, 173, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79],
  [79, 79, 79, 188, 189, 79, 79, 79, 79, 79, 79, 155, 156, 156, 157, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 155, 156],
  [34, 34, 79, 79, 79, 79, 79, 79, 79, 79, 79, 171, 172, 172, 173, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 155, 142, 172],
  [34, 34, 34, 79, 79, 79, 79, 79, 79, 79, 79, 171, 172, 172, 173, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 171, 172, 172],
  [34, 34, 34, 34, 79, 79, 79, 79, 79, 79, 155, 172, 172, 159, 189, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 171, 172, 172],
  [34, 34, 34, 34, 34, 34, 79, 79, 79, 79, 171, 172, 172, 173, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 79, 155, 142, 172, 172]
];
var layer01 = [
  [0, 0, 32, 33, 0, 236, 0, 0, 236, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 69, 0, 0, 0, 0, 0, 32, 33],
  [0, 0, 48, 49, 0, 236, 220, 220, 236, 0, 0, 147, 72, 73, 70, 71, 72, 73, 83, 83, 84, 85, 0, 0, 0, 0, 0, 48, 49],
  [0, 0, 64, 65, 54, 0, 236, 236, 0, 0, 162, 163, 84, 89, 86, 87, 88, 89, 99, 99, 100, 101, 0, 0, 0, 0, 7, 112, 113],
  [0, 0, 80, 81, 70, 54, 55, 50, 0, 0, 0, 179, 100, 105, 102, 103, 104, 105, 0, 0, 0, 0, 0, 0, 16, 22, 23, 39],
  [0, 0, 96, 97, 86, 70, 65, 144, 193, 0, 0, 37, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 48, 49],
  [0, 0, 0, 0, 102, 86, 81, 160, 161, 0, 0, 37, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 64, 65, 174, 175, 67, 66, 54],
  [0, 0, 0, 0, 0, 102, 97, 176, 177, 0, 0, 37, 0, 252, 0, 0, 0, 201, 202, 0, 0, 0, 0, 0, 80, 81, 190, 191, 83, 82, 70, 71],
  [0, 0, 0, 0, 0, 0, 0, 48, 49, 0, 0, 53, 0, 0, 0, 0, 0, 217, 218, 0, 0, 0, 0, 0, 96, 97, 222, 223, 99, 98, 86, 87],
  [201, 202, 0, 0, 0, 0, 0, 64, 65, 66, 68, 69, 0, 0, 0, 0, 0, 233, 234, 0, 0, 0, 0, 0, 238, 239, 0, 0, 238, 239, 102, 103],
  [217, 218, 0, 0, 0, 0, 0, 80, 81, 82, 84, 85, 0, 0, 0, 0, 0, 249, 250, 0, 0, 0, 0, 0, 254, 255, 0, 0, 254, 255],
  [233, 234, 0, 0, 0, 0, 0, 96, 97, 98, 100, 101, 0, 0, 0, 0, 0, 0, 0],
  [249, 250, 0, 0, 201, 202, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 238, 239, 0, 0, 238, 239],
  [0, 0, 0, 0, 217, 218, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 254, 255, 0, 0, 254, 255],
  [0, 0, 0, 0, 233, 234, 196, 197, 198],
  [2, 3, 4, 0, 249, 250, 228, 229, 230],
  [18, 19, 20, 8, 0, 0, 244, 245, 246, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 201, 202],
  [0, 35, 40, 24, 25, 8, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 0, 0, 0, 0, 0, 0, 0, 0, 217, 218],
  [0, 0, 0, 40, 41, 20, 8, 9, 0, 0, 0, 0, 0, 0, 0, 16, 17, 18, 19, 20, 21, 0, 0, 0, 0, 0, 0, 0, 233, 234],
  [0, 0, 0, 0, 40, 19, 24, 25, 8, 9, 0, 0, 0, 0, 0, 48, 49, 50, 51, 52, 115, 3, 4, 0, 0, 0, 0, 0, 249, 250],
  [0, 0, 0, 0, 0, 0, 40, 41, 20, 21, 0, 0, 0, 0, 0, 64, 65, 66, 67, 52, 19, 19, 20, 21]
];
var layer02 = [
  [0, 0, 0, 0, 0, 220, 0, 0, 220],
  [],
  [],
  [],
  [],
  [0, 0, 0, 0, 0, 0, 0, 0, 201, 202],
  [0, 0, 0, 0, 0, 0, 0, 0, 217, 218],
  [0, 0, 0, 0, 0, 0, 0, 0, 233, 234],
  [0, 0, 0, 0, 0, 0, 0, 0, 249, 250],
  [],
  [],
  [],
  [],
  [],
  [],
  [],
  [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 196, 197, 198],
  [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 228, 229, 230],
  [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 244, 245, 246],
  []
];

function drawImage() {
  // Draw the arrays to the canvas
  for (var r = 0; r < rowTileCount; r++) {
    for (var c = 0; c < colTileCount; c++) {
      var tile = ground[r][c];
      var tileRow = (tile / imageNumTiles) | 0; // Bitwise OR operation
      var tileCol = (tile % imageNumTiles) | 0;
      ctx.drawImage(tilesetImage, (tileCol * tileSize), (tileRow * tileSize), tileSize, tileSize, (c * tileSize), (r * tileSize), tileSize, tileSize);

      var tile = layer01[r][c];
      var tileRow = (tile / imageNumTiles) | 0;
      var tileCol = (tile % imageNumTiles) | 0;
      ctx.drawImage(tilesetImage, (tileCol * tileSize), (tileRow * tileSize), tileSize, tileSize, (c * tileSize), (r * tileSize), tileSize, tileSize);

      var tile = layer02[r][c];
      var tileRow = (tile / imageNumTiles) | 0;
      var tileCol = (tile % imageNumTiles) | 0;
      ctx.drawImage(tilesetImage, (tileCol * tileSize), (tileRow * tileSize), tileSize, tileSize, (c * tileSize), (r * tileSize), tileSize, tileSize);
    }
  }
}
<canvas id="main" width="1024" height="640">

See how to build this map step by step.

I believe that with these guidelines you will be able to do even a better game!

  

If you want to study animation with html5, canvas, there is a free course   using processing, which is very similar to canvas khanacademy   Animation

    
16.02.2015 / 07:51
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