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CSS Base

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              div#container
  div.v-pane
    div
      button#tile-clear Clear
      button#tile-add-area Add 10

  div.v-pane#grid

  div.v-pane
    div
      button#tile-create Create
      button#tile-discard Discard
    label
      input(type="radio", name="layer", value=0 checked="true")
      span Base
    label
      input(type="radio", name="layer", value=1)
      span Obstacle
    pre
      code#json
            
          
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              body {
  background-color: #333
}

.v-pane {
  display: inline-block
  vertical-align: top
}

.tile {
  color: white
  display: inline-block
  background-color: blue;
  width: 23px;
  height: 23px;
  position: absolute;
}
.tile.hover {
  background-color: rgba(255, 0, 0, 0.5)
  z-index: 100
}
.tile.hover.clicked {
  display: none
}
.tile.tmpTile {
  display: none
  background-color: rgba(255, 0, 0, 0.25)
  z-index: 99
}
.tile.tmpTile.dragged {
  display: inline-block
}
.tile.drawn {
  background-color: rgba(64, 64, 255, 0.75)
}

#json {
  display: inline-block;
  height: 5em;
  background-color: #eee;
  font-family: monospace
}

#grid {
  width: 169px
  height: 241px
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.25) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.25) 1px, transparent 1px);
  background-size:24px 24px;
  background-repeat: repeat
}
.clearfix::after {
    content: "";
    clear: both;
    display: table;
}

            
          
!
            
              var tmpStart = {x: 0, y: 0};
var tmpStop = {x: 0, y: 0};
var isDown=false;
var graphHeight = 10;

var tilesize = {w: 24, h: 24}
var tiles = []

var container = $("#grid")
var containerPos = container.offset()
var hoverTile = $('<div class="tile hover"></tile>')
var tmpTile = $('<div class="tile tmpTile"></tile>')
container.append(hoverTile)
container.append(tmpTile)

var btnPick = $('#tile-pick');
var btnClear = $('#tile-clear');
var btnCreate = $('#tile-create');
var btnDiscard = $('#tile-discard');
var btnAddArea = $('#tile-add-area');

container.mousedown(handleMouseDown.bind(this));
container.mouseup(handleMouseUp.bind(this));
container.mousemove(_.throttle(handleMouseMove.bind(this), 16, {leading: true, trailing: true}));

btnCreate.click(createTile);
btnDiscard.click(hideTmpTile);
btnClear.click(clearAllTiles);
btnAddArea.click(addArea);

function handleMouseDown(ev) {
  isDown = true;
  hoverTile.addClass('clicked')
  tmpTile.addClass('dragged')
  tmpTile.css('width', 23)
  tmpTile.css('height', 23)
  tmpTile.css('left', containerPos.left + pos.t.x * tilesize.w + 1)
  tmpTile.css('top', containerPos.top + pos.t.y * tilesize.h + 1)
  pos = getPos(ev);
  setStart(pos.t.x, pos.t.y);
}
function handleMouseUp(ev) {
  isDown = false;
  hoverTile.removeClass('clicked')
  pos = getPos(ev);
  setStop(pos.t.x, pos.t.y);
}
function handleMouseMove(ev) {
  pos = getPos(ev);
  hoverTile.css('left', containerPos.left + pos.t.x * tilesize.w + 1)
  hoverTile.css('top', containerPos.top + pos.t.y * tilesize.h + 1)
  if (isDown) {
    tmpTile.css('left', containerPos.left + Math.min(pos.t.x, tmpStart.x) * tilesize.w + 1)
    tmpTile.css('top', containerPos.top + Math.min(pos.t.y, tmpStart.y) * tilesize.h + 1)
    tmpTile.css('width', 24 * (Math.abs(pos.t.x - tmpStart.x) + 1) - 1)
    tmpTile.css('height', 24 * (Math.abs(pos.t.y - tmpStart.y) + 1) - 1)
  }
}

function getPos(ev) {
  var parentOffset = container.offset();
  var pos = {x: ev.pageX - parentOffset.left, y: ev.pageY - parentOffset.top};
  pos.t = {x: Math.floor(pos.x/tilesize.w), y: Math.floor(pos.y/tilesize.h)};
  return pos;
}
function setStart(x, y) {
  tmpStart = {x: x, y: y};
}
function setStop(x, y) {
  tmpStop = {x: x, y: y};
}

function createTile() {
  var newTile = {};
  newTile.start = {x: Math.min(tmpStart.x, tmpStop.x), y: Math.min(tmpStart.y, tmpStop.y)};
  newTile.stop = {x: Math.max(tmpStart.x, tmpStop.x), y: Math.max(tmpStart.y, tmpStop.y)};
  newTile.layer = parseInt( $('input[name="layer"]:checked').val() );
  tiles.push(newTile);
  drawTile(newTile);
  hideTmpTile();
  calcJson();
}
function drawTile(tile) {
  var newTile = $('<div class="tile drawn"></div>');
  newTile.css('left', containerPos.left + tile.start.x * tilesize.w + 1)
  newTile.css('top', containerPos.top + tile.start.y * tilesize.h + 1)
  newTile.css('width', 24 * (Math.abs(tile.start.x - tile.stop.x) + 1) - 1)
  newTile.css('height', 24 * (Math.abs(tile.start.y - tile.stop.y) + 1) - 1)
  container.append(newTile)
}
function hideTmpTile() {
  tmpTile.removeClass('dragged')
}
function clearAllTiles() {
  $('.tile.drawn').remove();
  tiles = [];
  $('#json').text('');
}

function addArea() {
  graphHeight += 10;
  container.css('height', tilesize.h * graphHeight + 1)
  $('.tile.drawn').each(function(index, element) {
    var elem = $(element);
    var cTop = elem.offset().top + (tilesize.h * 10);
    elem.css('top', cTop);
    html = $('html');
    html.scrollTop( container.height() - html.scrollTop() + 1 );
  });
  for(var i in tiles) {
    tiles[i].start.y += 10;
    tiles[i].stop.y += 10;
  }
}

function calcJson() {
  var convertedTiles = [];
  for(var i in tiles) {
    t = tiles[i];
    // Invert y
    var tmp1 = graphHeight - t.start.y - 1;
    var tmp2 = graphHeight - t.stop.y - 1;
    var yStart = Math.min(tmp1, tmp2);
    var yStop = Math.max(tmp1, tmp2);
    
    tile = [
      [t.start.x, yStart],
      [t.stop.x, yStop],
      1,
      t.layer,
      0
    ];
    convertedTiles.push(tile)
  }
  var tilesJson = JSON.stringify(convertedTiles);
  console.log(tilesJson);
  $('#json').text(tilesJson);
}

function loadTiles() {
  // Todo
}

            
          
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