+function Map(textdef) {
+ this.frametime = performance.now();
+ if (gamedata[textdef]) this.info = gamedata[textdef];
+ else gamedata[textdef] = this.info = new Textfile(textdef);
+ if (gamedata[this.info.header.tileset]) this.tileset = gamedata[this.info.header.tileset];
+ else gamedata[this.info.header.tileset] = this.tileset = new Textfile(this.info.header.tileset);
+ if (! gfx[this.tileset.img]) {
+ gfx[this.tileset.img] = document.createElement("img");
+ gfx[this.tileset.img].setAttribute("src", this.tileset.img);
+ }
+
+ this.tileAt = function(x, y) {
+ nx = y / this.info.header.tileheight + x / this.info.header.tilewidth |0;
+ ny = y / this.info.header.tileheight - x / this.info.header.tilewidth |0;
+ return ny * this.info.header.width + nx;
+ }
+
+ this.draw = function(posx, posy, mobs) {
+ var x, y, i, layer;
+ var h = this.info.header.height;
+ var w = this.info.header.width;
+ var th = this.info.header.tileheight;
+ var tw = this.info.header.tilewidth;
+
+ posx = canvas.canvas.width / 2 - posx + w * tw / 2;
+ posy = canvas.canvas.height / 2 - posy;
+
+ canvas.fillStyle = "rgba("+this.info.header.background_color+")";
+ canvas.fillRect(0,0, canvas.canvas.width, canvas.canvas.height);
+
+ [ this.info.layer[0].data, this.info.layer[1].data ].forEach(layer => {
+ for (y = 0; y < 2 * h - 1; y++ )
+ if ( y < h ) for ( x = 0; x <= y; x++ ){
+ i = (y - x) * w + x;
+ if (layer[i]) this.draw_tile( layer[i],
+ posx - (y / 2 - x) * tw,
+ posy + y / 2 * th);
+ } else for ( x = 0; x < 2 * h - y - 1; x++ ){
+ i = (w - x - 2) * h + x + y + 1;
+ if (layer[i]) this.draw_tile( layer[i],
+ posx - (h - 1 - x - y / 2) * tw,
+ posy + y / 2 * th);
+ }
+ })
+ }
+
+ this.draw_tile = function(tile, x, y) {
+ t = this.tileset.tile[tile], x = x|0, y = y|0;
+
+ if (this.tileset.animation[tile]) {
+ f = this.tileset.animation[tile];
+ frame = ((performance.now() - this.frametime) / f[0][2] |0) % f.length;
+ canvas.drawImage(gfx[this.tileset.img], f[frame][0], f[frame][1], t[2], t[3],
+ x - t[4], y - t[5], t[2], t[3]);
+ } else {
+ canvas.drawImage(gfx[this.tileset.img], t[0], t[1], t[2], t[3],
+ x - t[4], y - t[5], t[2], t[3]);
+ }
+ }
+}
+