Alt-Reality/index.html at main · TeamRekursion/Alt-Reality · GitHub

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<!DOCTYPE HTML>
<html>
    <!-- <style>
        #gameCanvas{
            background-image: url(https://images-wixmp-ed30a86b8c4ca887773594c2.wixmp.com/f/c775db8f-9102-4611-9c7f-ec3f4a1e2c7d/dcr45hd-e0db89c0-58e9-4a94-9d4b-e2e4fd4c4756.png/v1/fill/w_400,h_400,q_80,strp/chris_hemsworth_as_shrek_by_zackmcawesome_dcr45hd-fullview.jpg?token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ1cm46YXBwOiIsImlzcyI6InVybjphcHA6Iiwib2JqIjpbW3siaGVpZ2h0IjoiPD00MDAiLCJwYXRoIjoiXC9mXC9jNzc1ZGI4Zi05MTAyLTQ2MTEtOWM3Zi1lYzNmNGExZTJjN2RcL2RjcjQ1aGQtZTBkYjg5YzAtNThlOS00YTk0LTlkNGItZTJlNGZkNGM0NzU2LnBuZyIsIndpZHRoIjoiPD00MDAifV1dLCJhdWQiOlsidXJuOnNlcnZpY2U6aW1hZ2Uub3BlcmF0aW9ucyJdfQ.jip6NvBLgoZxVc8qecqxJgRNiSdSC1Wx7pU7BzsUAvg);
            background-repeat: no-repeat;
        }
    </style> -->
<body>
<canvas id="gameCanvas" width=1150 height=600>
    </canvas>
    <img style="display:none" id="use" src="https://images-wixmp-ed30a86b8c4ca887773594c2.wixmp.com/f/c775db8f-9102-4611-9c7f-ec3f4a1e2c7d/dcr45hd-e0db89c0-58e9-4a94-9d4b-e2e4fd4c4756.png/v1/fill/w_400,h_400,q_80,strp/chris_hemsworth_as_shrek_by_zackmcawesome_dcr45hd-fullview.jpg?token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ1cm46YXBwOiIsImlzcyI6InVybjphcHA6Iiwib2JqIjpbW3siaGVpZ2h0IjoiPD00MDAiLCJwYXRoIjoiXC9mXC9jNzc1ZGI4Zi05MTAyLTQ2MTEtOWM3Zi1lYzNmNGExZTJjN2RcL2RjcjQ1aGQtZTBkYjg5YzAtNThlOS00YTk0LTlkNGItZTJlNGZkNGM0NzU2LnBuZyIsIndpZHRoIjoiPD00MDAifV1dLCJhdWQiOlsidXJuOnNlcnZpY2U6aW1hZ2Uub3BlcmF0aW9ucyJdfQ.jip6NvBLgoZxVc8qecqxJgRNiSdSC1Wx7pU7BzsUAvg"/>
<script>

// wrapper for our game "classes", "methods" and "objects"
window.Game = {};
// Set the right viewport size for the camera


// wrapper for "class" Rectangle
(function() {
  function Rectangle(left, top, width, height) {
    this.left = left || 0;
    this.top = top || 0;
    this.width = width || 0;
    this.height = height || 0;
    this.right = this.left + this.width;
    this.bottom = this.top + this.height;
  }

  Rectangle.prototype.set = function(left, top, /*optional*/ width, /*optional*/ height) {
    this.left = left;
    this.top = top;
    this.width = width || this.width;
    this.height = height || this.height
    this.right = (this.left + this.width);
    this.bottom = (this.top + this.height);
  }

  Rectangle.prototype.within = function(r) {
    return (r.left <= this.left &&
      r.right >= this.right &&
      r.top <= this.top &&
      r.bottom >= this.bottom);
  }

  Rectangle.prototype.overlaps = function(r) {
    return (this.left < r.right &&
      r.left < this.right &&
      this.top < r.bottom &&
      r.top < this.bottom);
  }

  // add "class" Rectangle to our Game object
  Game.Rectangle = Rectangle;
})();

// wrapper for "class" Camera (avoid global objects)
(function() {

  // possibles axis to move the camera
  var AXIS = {
    NONE: 1,
    HORIZONTAL: 2,
    VERTICAL: 3,
    BOTH: 4
  };

  // Camera constructor
  function Camera(xView, yView, viewportWidth, viewportHeight, worldWidth, worldHeight) {
    // position of camera (left-top coordinate)
    this.xView = xView || 0;
    this.yView = yView || 0;

    // distance from followed object to border before camera starts move
    this.xDeadZone = 0; // min distance to horizontal borders
    this.yDeadZone = 0; // min distance to vertical borders

    // viewport dimensions
    this.wView = viewportWidth;
    this.hView = viewportHeight;

    // allow camera to move in vertical and horizontal axis
    this.axis = AXIS.BOTH;

    // object that should be followed
    this.followed = null;

    // rectangle that represents the viewport
    this.viewportRect = new Game.Rectangle(this.xView, this.yView, this.wView, this.hView);

    // rectangle that represents the world's boundary (room's boundary)
    this.worldRect = new Game.Rectangle(0, 0, worldWidth, worldHeight);

  }

  // gameObject needs to have "x" and "y" properties (as world(or room) position)
  Camera.prototype.follow = function(gameObject, xDeadZone, yDeadZone) {
    this.followed = gameObject;
    this.xDeadZone = xDeadZone;
    this.yDeadZone = yDeadZone;
  }

  Camera.prototype.update = function() {
    // keep following the player (or other desired object)
    if (this.followed != null) {
      if (this.axis == AXIS.HORIZONTAL || this.axis == AXIS.BOTH) {
        // moves camera on horizontal axis based on followed object position
        if (this.followed.x - this.xView + this.xDeadZone > this.wView)
          this.xView = this.followed.x - (this.wView - this.xDeadZone);
        else if (this.followed.x - this.xDeadZone < this.xView)
          this.xView = this.followed.x - this.xDeadZone;

      }
      if (this.axis == AXIS.VERTICAL || this.axis == AXIS.BOTH) {
        // moves camera on vertical axis based on followed object position
        if (this.followed.y - this.yView + this.yDeadZone > this.hView)
          this.yView = this.followed.y - (this.hView - this.yDeadZone);
        else if (this.followed.y - this.yDeadZone < this.yView)
          this.yView = this.followed.y - this.yDeadZone;
      }

    }

    // update viewportRect
    this.viewportRect.set(this.xView, this.yView);

    // don't let camera leaves the world's boundary
    if (!this.viewportRect.within(this.worldRect)) {
      if (this.viewportRect.left < this.worldRect.left)
        this.xView = this.worldRect.left;
      if (this.viewportRect.top < this.worldRect.top)
        this.yView = this.worldRect.top;
      if (this.viewportRect.right > this.worldRect.right)
        this.xView = this.worldRect.right - this.wView;
      if (this.viewportRect.bottom > this.worldRect.bottom)
        this.yView = this.worldRect.bottom - this.hView;
    }

  }

  // add "class" Camera to our Game object
  Game.Camera = Camera;

})();

// wrapper for "class" Player
(function() {
  function Player(x, y) {
    // (x, y) = center of object
    // ATTENTION:
    // it represents the player position on the world(room), not the canvas position
    this.x = x;
    this.y = y;

    // move speed in pixels per second
    this.speed = 200;

    // render properties
    this.width = 30;
    this.height = 30;
  }

  Player.prototype.update = function(step, worldWidth, worldHeight) {
    // parameter step is the time between frames ( in seconds )
    console.log(this.x, this.y);


    // check controls and move the player accordingly
    if (Game.controls.left)
      this.x -= this.speed * step;
    if (Game.controls.up)
      this.y -= this.speed * step;
    if (Game.controls.right)
      this.x += this.speed * step;
    if (Game.controls.down)
      this.y += this.speed * step;

    // don't let player leaves the world's boundary
    if (this.x - this.width / 2 < 0) {
      this.x = this.width / 2;
    }
    if (this.y - this.height / 2 < 0) {
      this.y = this.height / 2;
    }
    if (this.x + this.width / 2 > worldWidth) {
      this.x = worldWidth - this.width / 2;
    }
    if (this.y + this.height / 2 > worldHeight) {
      this.y = worldHeight - this.height / 2;
    }
  }

  Player.prototype.draw = function(context, xView, yView) {
//     // draw a simple rectangle shape as our player model
//     context.save();
//     var img = document.getElementById("use");
// //   var pat = ctx.createPattern(img, direction);
//     var pat = context.createPattern(img, "no-repeat");
//     // context.fillStyle = "#25f56a";
//     context.fillStyle = pat;
//     context.fill();
//     // before draw we need to convert player world's position to canvas position
    // context.fillRect((this.x - this.width / 2) - xView, (this.y - this.height / 2) - yView, this.width, this.height);

context.save();
context.restore();

  }

  // add "class" Player to our Game object
  Game.Player = Player;

})();

// wrapper for "class" Map
(function() {
  function Map(width, height) {
    // map dimensions
    this.width = width;
    this.height = height;

    // map texture
    this.image = null;
  }

  // creates a prodedural generated map (you can use an image instead)
  Map.prototype.generate = function() {
    var ctx = document.createElement("canvas").getContext("2d");
    ctx.canvas.width = this.width;
    ctx.canvas.height = this.height;

    var rows = ~~(this.width / 44) + 1;
    var columns = ~~(this.height / 44) + 1;

    var color = "#c2d7ff";
    ctx.save();
    ctx.fillStyle = "#c2d7ff";
    for (var x = 0, i = 0; i < rows; x += 44, i++) {
      ctx.beginPath();
      for (var y = 0, j = 0; j < columns; y += 44, j++) {
        ctx.rect(x, y, 40, 40);
      }
      color = (color == "#c2d7ff" ? "#c2d7ff" : "#c2d7ff");
      ctx.fillStyle = color;
      ctx.fill();
      ctx.closePath();
    }
    ctx.restore();

    // store the generate map as this image texture
    this.image = new Image();
    this.image.src = ctx.canvas.toDataURL("image/png");

    // clear context
    ctx = null;
  }

  // draw the map adjusted to camera
  Map.prototype.draw = function(context, xView, yView) {
    // easiest way: draw the entire map changing only the destination coordinate in canvas
    // canvas will cull the image by itself (no performance gaps -> in hardware accelerated environments, at least)
    /*context.drawImage(this.image, 0, 0, this.image.width, this.image.height, -xView, -yView, this.image.width, this.image.height);*/

    // didactic way ( "s" is for "source" and "d" is for "destination" in the variable names):

    var sx, sy, dx, dy;
    var sWidth, sHeight, dWidth, dHeight;

    // offset point to crop the image
    sx = xView;
    sy = yView;

    // dimensions of cropped image
    sWidth = context.canvas.width;
    sHeight = context.canvas.height;

    // if cropped image is smaller than canvas we need to change the source dimensions
    if (this.image.width - sx < sWidth) {
      sWidth = this.image.width - sx;
    }
    if (this.image.height - sy < sHeight) {
      sHeight = this.image.height - sy;
    }

    // location on canvas to draw the croped image
    dx = 0;
    dy = 0;
    // match destination with source to not scale the image
    dWidth = sWidth;
    dHeight = sHeight;

    context.drawImage(this.image, sx, sy, sWidth, sHeight, dx, dy, dWidth, dHeight);
  }

  // add "class" Map to our Game object
  Game.Map = Map;

})();

// Game Script
(function() {
  // prepaire our game canvas
  var canvas = document.getElementById("gameCanvas");
  var context = canvas.getContext("2d");

  // game settings:
  var FPS = 30;
  var INTERVAL = 1000 / FPS; // milliseconds
  var STEP = INTERVAL / 1000 // seconds

  // setup an object that represents the room
  var room = {
    width: 1500,
    height: 1300,
    map: new Game.Map(1500, 1300)
  };

  // generate a large image texture for the room
  room.map.generate();

  // setup player
  var player = new Game.Player(50, 50);
//   var player = new Game.Player(10, 10);

  // Old camera setup. It not works with maps smaller than canvas. Keeping the code deactivated here as reference.
  /* var camera = new Game.Camera(0, 0, canvas.width, canvas.height, room.width, room.height);*/
  /* camera.follow(player, canvas.width / 2, canvas.height / 2); */

  // Set the right viewport size for the camera

//   var vWidth = Math.min(room.width, canvas.width);
//   var vHeight = Math.min(room.height, canvas.height);
  var vWidth = Math.min(room.width, canvas.width);
  var vHeight = Math.min(room.height, canvas.height);

  // Setup the camera
  var camera = new Game.Camera(0, 0, vWidth, vHeight, room.width, room.height);
  camera.follow(player, vWidth / 2, vHeight / 2);

  // Game update function
  var update = function() {
    player.update(STEP, room.width, room.height);
    camera.update();
  }

  // Game draw function
  var draw = function() {
    // clear the entire canvas
    context.clearRect(0, 0, canvas.width, canvas.height);

    // redraw all objects
    room.map.draw(context, camera.xView, camera.yView);
    player.draw(context, camera.xView, camera.yView);
  }

  // Game Loop
  var gameLoop = function() {
    update();
    draw();
  }

  // <-- configure play/pause capabilities:

  // Using setInterval instead of requestAnimationFrame for better cross browser support,
  // but it's easy to change to a requestAnimationFrame polyfill.

  var runningId = -1;

  Game.play = function() {
    if (runningId == -1) {
      runningId = setInterval(function() {
        gameLoop();
      }, INTERVAL);
      console.log("play");
    }
  }

//   Game.togglePause = function() {
//     if (runningId == -1) {
//       Game.play();
//     } else {
//       clearInterval(runningId);
//       runningId = -1;
//       console.log("paused");
//     }
//   }

  // -->

})();

// <-- configure Game controls:

Game.controls = {
  left: false,
  up: false,
  right: false,
  down: false,
};

window.addEventListener("keydown", function(e) {
  switch (e.keyCode) {
    case 37: // left arrow
      Game.controls.left = true;
      break;
    case 38: // up arrow
      Game.controls.up = true;
      break;
    case 39: // right arrow
      Game.controls.right = true;
      break;
    case 40: // down arrow
      Game.controls.down = true;
      break;
  }
}, false);

window.addEventListener("keyup", function(e) {
  switch (e.keyCode) {
    case 37: // left arrow
      Game.controls.left = false;
      break;
    case 38: // up arrow
      Game.controls.up = false;
      break;
    case 39: // right arrow
      Game.controls.right = false;
      break;
    case 40: // down arrow
      Game.controls.down = false;
      break;
    // case 80: // key P pauses the game
    //   Game.togglePause();
    //   break;
  }
}, false);

// -->

// start the game when page is loaded
window.onload = function() {
  Game.play();
}

</script>
</body>
</html>