Terrain Tags (MV)

//=============================================================================
// Terrain Tags
// by Shaz
// Last Updated: 2015.12.04
//-----------------------------------------------------------------------------
// This plugin is still under development
//=============================================================================

/*:
 * @plugindesc Uses terrain tags to change map behaviour
 * @author Shaz
 *
 * @param Passability Number
 * @desc Terrain tag to indicate "use passability from tile below"
 * @default -1
 *
 * @param Counter Number
 * @desc Terrain tag to indicate "behave like counter (allow interaction)"
 * @default -1
 *
 * @param Offset Numbers
 * @desc Terrain tag to indicate tile should be drawn higher (separate by ;)
 * @default -1
 *
 * @param Offset Pixels
 * @desc Height adjustment for Offset (one per offset number, separate by ;)
 * @default
 *
 * @param Under Shadow Number
 * @descr Draws the tile below the auto shadow
 * @default -1
 *
 * @help This plugin does not provide plugin commands.
 *
 * Set the terrain tag on the parameters you want to use to the relevant
 * terrain tag, then flag tiles with that terrain tag as necessary.  Any
 * parameters left as -1 indicate those parts of the plugin will not be
 * active.
 *
 * Passability Number
 * ------------------
 * This terrain tag allows you to ignore the passage settings on that tile
 * and to look at the tile below it.  For example, a cliff with a small flower
 * right on the upper edge, with the flower having a O passage setting, would
 * allow the player to walk off the upper edge of the cliff.  With this
 * parameter, the game ignores the O passage setting on the flower and looks
 * at the setting on the cliff tile below it.
 *
 * Counter Number
 * --------------
 * This terrain tag allows you to assign a tile to act like a counter tile,
 * without looking like a counter tile.  Normally, autotiles flagged as counters
 * are drawn so that they extend over the tile below, which looks okay for
 * tables, but not for other things, like fences or narrow streams.  With this
 * parameter, the player can interact with NPC events with a tile between them.
 *
 * Offset Numbers and Pixels
 * -------------------------
 * This terrain tag and the paired pixel count allow you to move those tiles up
 * by the specified number of pixels, so they aren't drawn snapped to the grid.
 * If used, there must be the same number of entries in the terrain tags list
 * and the pixels list, separated by a semi-colon (;).  An example of usage is
 * to move pictures higher up on a wall so they are not aligned to either the
 * bottom half or the top half, without needing to rearrange the tileset images.
 *
 * Under Shadow Number
 * -------------------
 * This terrain tag, used on B-E tiles, indicates that those tiles are to be
 * drawn BELOW any autoshadow if one exists.  If two B-E tiles are drawn on the
 * same spot, make sure one with this terrain tag is drawn first.
 *
 *
 *
 */

(function() {

  var parameters = PluginManager.parameters('TerrainTags');
  var passageTerrain = Number(parameters['Passability Number'] || -1);
  var counterTerrain = Number(parameters['Counter Number'] || -1);
  var offsetTerrain = String(parameters['Offset Numbers'] || -1).split(';').map(function(id) {
    return Number(id);
  });
  var offsetPixels = String(parameters['Offset Pixels'] || 0).split(';').map(function(id) {
    return Number(id);
  });
  var mapOffsets = {};
  offsetTerrain.forEach(function(id, index) {
    if (id !== -1) {
      mapOffsets[id] = offsetPixels[index];
    }
  }.bind(this));
  var underShadowTerrain = Number(parameters['Under Shadow Number'] || -1);

  var _Game_Map_checkPassage = Game_Map.prototype.checkPassage;
  Game_Map.prototype.checkPassage = function(x, y, bit) {
    if (passageTerrain === -1) {
      return _Game_Map_checkPassage.call(this, x, y, bit);
    } else {
      var flags = this.tilesetFlags();
      var tiles = this.allTiles(x, y);
      for (var i = 0; i < tiles.length; i++) {
        var flag = flags[tiles[i]];
        if ((flag & 0x10) !== 0) // [*] No effect on passage
          continue;
        if (flag >> 12 === passageTerrain) // Take passage from tile below
          continue;
        if ((flag & bit) === 0)  // [o] Passable
          return true;
        if ((flag & bit) === bit) // [x] Impassable
          return false;
      }
      return false;
    }
  };

  var _Game_Map_isCounter = Game_Map.prototype.isCounter;
  Game_Map.prototype.isCounter = function(x, y) {
    if (counterTerrain === -1) {
      return _Game_Map_isCounter.call(this, x, y);
    } else {
      return _Game_Map_isCounter.call(this, x, y) || this.terrainTag(x, y) === counterTerrain;
    }
  };

  var _Tilemap_drawNormalTile = Tilemap.prototype._drawNormalTile;
  Tilemap.prototype._drawNormalTile = function(bitmap, tileId, dx, dy) {
    dy -= mapOffsets[$gameMap.tilesetFlags()[tileId] >> 12] || 0;
    _Tilemap_drawNormalTile.call(this, bitmap, tileId, dx, dy);
  };

  Tilemap.prototype._paintTiles = function(startX, startY, x, y) {
      var tableEdgeVirtualId = 10000;
      var mx = startX + x;
      var my = startY + y;
      var dx = (mx * this._tileWidth).mod(this._layerWidth);
      var dy = (my * this._tileHeight).mod(this._layerHeight);
      var lx = dx / this._tileWidth;
      var ly = dy / this._tileHeight;
      var tileId0 = this._readMapData(mx, my, 0);
      var tileId1 = this._readMapData(mx, my, 1);
      var tileId2 = this._readMapData(mx, my, 2);
      var tileId3 = this._readMapData(mx, my, 3);
      var shadowBits = this._readMapData(mx, my, 4);
      var upperTileId1 = this._readMapData(mx, my - 1, 1);
      var lowerTiles = [];
      var upperTiles = [];
      var flags = $gameMap.tilesetFlags();

      if (this._isHigherTile(tileId0)) {
          upperTiles.push(tileId0);
      } else {
          lowerTiles.push(tileId0);
      }
      if (this._isHigherTile(tileId1)) {
          upperTiles.push(tileId1);
      } else {
          lowerTiles.push(tileId1);
      }

      var shadowDrawn = false;
      if (underShadowTerrain === -1) {
          lowerTiles.push(-shadowBits);
          shadowDrawn = true;
      }

      if (this._isTableTile(upperTileId1) && !this._isTableTile(tileId1)) {
          if (!Tilemap.isShadowingTile(tileId0)) {
              if (underShadowTerrain !== -1 && !shadowDrawn && flags[upperTileId1] >> 12 !== underShadowTerrain) {
                lowerTiles.push(-shadowBits);
                shadowDrawn = true;
              }
              lowerTiles.push(tableEdgeVirtualId + upperTileId1);
          }
      }

      if (this._isOverpassPosition(mx, my)) {
          upperTiles.push(tileId2);
          upperTiles.push(tileId3);
      } else {
          if (this._isHigherTile(tileId2)) {
              upperTiles.push(tileId2);
          } else {
              if (underShadowTerrain !== -1 && !shadowDrawn && flags[tileId2] >> 12 !== underShadowTerrain) {
                lowerTiles.push(-shadowBits);
                shadowDrawn = true;
              }
              lowerTiles.push(tileId2);
          }
          if (this._isHigherTile(tileId3)) {
              upperTiles.push(tileId3);
          } else {
              if (underShadowTerrain !== -1 && !shadowDrawn && flags[tileId3] >> 12 !== underShadowTerrain) {
                lowerTiles.push(-shadowBits);
                shadowDrawn = true;
              }
              lowerTiles.push(tileId3);
          }
      }

      if (!shadowDrawn) {
        lowerTiles.push(-shadowBits);
      }

      var count = 1000 + this.animationCount - my;
      var frameUpdated = (count % 30 === 0);
      this._animationFrame = Math.floor(count / 30);

      var lastLowerTiles = this._readLastTiles(0, lx, ly);
      if (!lowerTiles.equals(lastLowerTiles) ||
              (Tilemap.isTileA1(tileId0) && frameUpdated)) {
          this._lowerBitmap.clearRect(dx, dy, this._tileWidth, this._tileHeight);
          for (var i = 0; i < lowerTiles.length; i++) {
              var lowerTileId = lowerTiles[i];
              if (lowerTileId < 0) {
                  this._drawShadow(this._lowerBitmap, shadowBits, dx, dy);
              } else if (lowerTileId >= tableEdgeVirtualId) {
                  this._drawTableEdge(this._lowerBitmap, upperTileId1, dx, dy);
              } else {
                  this._drawTile(this._lowerBitmap, lowerTileId, dx, dy);
              }
          }
          this._writeLastTiles(0, lx, ly, lowerTiles);
      }

      var lastUpperTiles = this._readLastTiles(1, lx, ly);
      if (!upperTiles.equals(lastUpperTiles)) {
          this._upperBitmap.clearRect(dx, dy, this._tileWidth, this._tileHeight);
          for (var j = 0; j < upperTiles.length; j++) {
              this._drawTile(this._upperBitmap, upperTiles[j], dx, dy);
          }
          this._writeLastTiles(1, lx, ly, upperTiles);
      }
  };


})();