意义不明

拿到mv后写的第一个插件……导出地图为png图片，需要修改chrome打开参数以支持读取本地文件。

/*:
 * @plugindesc 不是很优雅的导出实际地图png，请用chrome增加参数--disable-web-security --allow-file-access-from-files后打开index.html
 * @author SureBrz
 *
 * @param mapId
 * @desc 要转换的地图id
 * @default 1
*/

(function() {

	var parameters = PluginManager.parameters('SaveMapImg');
	var mapId = parameters['mapId'] || 1;

	// = =||
	Graphics.isFontLoaded = function(name) {
		return true;
	};

	// 新增 绘制所有tile到bitmap
	Tilemap.prototype._paintAllMapTiles = function(bitmap, startX, startY) {
		var tileCols = this._mapWidth;
		var tileRows = this._mapHeight;
		for (var y = 0; y < tileRows; y++) {
			for (var x = 0; x < tileCols; x++) {
				this._paintActualTiles(bitmap, x, y);
			}
		}
	};
	// 新增 绘制一个tile到bitmap
	Tilemap.prototype._paintActualTiles = function(bitmap, x, y) {
		var tableEdgeVirtualId = 10000;
		var mx = x;
		var my = y;
		var dx = mx * this._tileWidth;
		var dy = my * 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 = [];

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

		lowerTiles.push(-shadowBits);

		if (this._isTableTile(upperTileId1) && !this._isTableTile(tileId1)) {
			if (!Tilemap.isShadowingTile(tileId0)) {
				lowerTiles.push(tableEdgeVirtualId + upperTileId1);
			}
		}

		if (this._isOverpassPosition(mx, my)) {
			upperTiles.push(tileId2);
			upperTiles.push(tileId3);
		} else {
			if (this._isHigherTile(tileId2)) {
				upperTiles.push(tileId2);
			} else {
				lowerTiles.push(tileId2);
			}
			if (this._isHigherTile(tileId3)) {
				upperTiles.push(tileId3);
			} else {
				lowerTiles.push(tileId3);
			}
		}


		for (var i = 0; i < lowerTiles.length; i++) {
			var lowerTileId = lowerTiles[i];
			if (lowerTileId < 0) {
				this._drawShadow(bitmap, shadowBits, dx, dy);
			} else if (lowerTileId >= tableEdgeVirtualId) {
				this._drawTableEdge(bitmap, upperTileId1, dx, dy);
			} else {
				this._drawTile(bitmap, lowerTileId, dx, dy);
			}
		}

		for (var j = 0; j < upperTiles.length; j++) {
			this._drawTile(bitmap, upperTiles[j], dx, dy);
		}
	};
	// 追加
	var _Scene_Boot_prototype_create = Scene_Boot.prototype.create;
	Scene_Boot.prototype.create = function() {
		DataManager.loadMapData(mapId);
		this.mapBitmapsLoaded = false;
		_Scene_Boot_prototype_create.call(this);
	};

	// 重写
	Scene_Boot.prototype.isReady = function() {
		if (Scene_Base.prototype.isReady.call(this)) {
			return DataManager.isDatabaseLoaded() && DataManager.isMapLoaded() && this.isGameFontLoaded();
		} else {
			return false;
		}
	};

	// 重写
	Scene_Boot.prototype.start = function() {
		DataManager.setupNewGame();
		$gameMap.setup(mapId);
		this.spriteset = new Spriteset_Map();
	};

	// 新增
	Scene_Boot.prototype.update = function() {
		console.log("Scene_Boot.update");
		if (!this.mapBitmapsLoaded && ImageManager.isReady()) {
			// 保存图片
			var tilemap = this.spriteset._tilemap;
			var width = tilemap._tileWidth * tilemap._mapWidth; //this._width;
			var height = tilemap._tileHeight * tilemap._mapHeight; //this._height;
			var bitmap = new Bitmap(width, height);
			tilemap._paintAllMapTiles(bitmap, 0, 0);
			window.location.href = bitmap.context.canvas.toDataURL("image/png").replace("image/png", "image/octet-stream");
			this.mapBitmapsLoaded = true
		}
		Scene_Base.prototype.update.call(this);
	};

}());

放进plugins里，用法参注释。