title: Highlighting a tile with transparency
body: <p>I am making turn based strategy based on a tiled map. My map contains two layers - first one is visible all the time and is used as a background, the second one is used for highlighting the tiles. Highlighted tiles shows possible movement for the player. For now the progress looks like this: </p>
  
  <p><a href="http://i57.tinypic.com/160brpu.png" rel="nofollow">My border boxes pic</a></p>
  
  <p>To make a highlighting possible I use this for loop:</p>
  
  <p><code>for(int s = 0;s&lt;7;){
      for (int i  = 0;i&lt;7;i++) {
  if ((inField(clickx + i,clicky + s)) &amp;&amp; !(tileWithPlayer(clickx + i,clicky + s))) 
                 {
                   highlight_layer.getCell(clickx + i, clicky+s).setTile(mark);
                 }
          }
        s++;
      }</code></p>
  
  <p>In this I use one tile from second layer of the map to make a border for a specific tiles. For now this tile is only 2px border of 32x32 transparent tile. To make highlighting disappear, I use similar for loop, where I set the tile to null. Selecting/deselecting tiles works great, but it is probably not the most efficient way to do this. I would like to exchange the blue border boxes into colored transparent boxes, something like in Advance wars during the movement, or as it can be seen below: </p>
  
  <p><a href="http://rpgmaker.net/media/content/users/3355/locker/Tutorial_TBSMove13.PNG" rel="nofollow">Desired look pic</a></p>
  
  <p>I tried to make a semi transparent tile on the second layer in tiled, but without luck. It could be nice if there is some possibility to apply only semi-transparent color on the specific tiles, without using the second layer tile. So, my question is - how can I exchange those ugly borders, into fully colored, (semi)transparent tiles, to achieve similar result as in above picture?</p>