var gamedata = {
- load: def => this[def] ? this[def] : this[def] = new Textfile(def)
+ // associative array for gamedata files
+ load: function(def) { return this[def] ? this[def] : this[def] = new Textfile(def); }
}
var gfx = {
+ // associative array for game graphics
load: function(def) {
if (!this[def]) {
this[def] = document.createElement("img");
};
function Textfile(txtfile) {
+ // fetch and parse gamedata file into structured object
var lines, fetch = new XMLHttpRequest();
fetch.open("GET", txtfile, false);
fetch.send();
var line, key, value, ref = this, section;
for (line of fetch.responseText.split('\n')) switch(true) {
+ // section headers that always become array elements
+ case /^\[(npc|event|layer|dialog)\]$/.test(line):
+ section = line.split(/[\]\[]/)[1]; ref = {};
+ if (!this[section]) this[section] = [ref];
+ else if ( Array.isArray(this[section])) this[section].push(ref);
+ break;
+ // general section headers (may or may not be unique)
case /^\[.*\]$/.test(line):
section = line.split(/[\]\[]/)[1]; ref = {};
if (!this[section]) this[section] = ref;
else if (!Array.isArray(this[section])) this[section] = [this[section],ref];
else if ( Array.isArray(this[section])) this[section].push(ref);
break;
+ // frame definition from animation files
+ // frame=#frame,direction,srcX,srcY,width,height,dstX,dstY
case /^frame=[0-9]+,[0-7](,[0-9-]+){6}$/.test(line):
key = line.split(/[=,]/).slice(1,3); value = line.split(/,/).slice(-6);
if (!ref.frame) ref.frame = [];
if (!ref.frame[key[0]]) ref.frame[key[0]] = [];
ref.frame[key[0]][key[1]] = value.map(x => parseInt(x));
break;
+ // order of gfx draw from engine/hero_layers.txt
+ // layer=direction,list,of,limbs,...
case /^layer=[0-9]+,/.test(line):
key = line.split(/[=,]/)[1]; value = line.split(/,/).slice(1);
if (!ref.layer) ref.layer = []; ref.layer[key] = value;
break;
+ // empty data= line starting map data in map files
case /^data=$/.test(line):
ref.data = [];
break;
+ // map data array
case /^[0-9,]+,$/.test(line):
value = line.split(/,/).slice(0,-1);
ref.data = ref.data.concat(value);
break;
+ // map data array (last line)
case /^[0-9,]+$/.test(line):
value = line.split(/,/);
ref.data = ref.data.concat(value);
ref.data = ref.data.map(x => parseInt(x));
break;
+ // tile description from tiledef file
+ // tile=#tile,srcX,srcY,width,height,dstX,dstY
case /^tile=[0-9]+,/.test(line):
key = line.split(/[=,]/)[1]; value = line.split(/,/).slice(1);
if (!ref.tile) ref.tile = []; ref.tile[key] = value.map(x => parseInt(x));
break;
+ // animated tile from tiledef file
+ // animation=#tile;(srcX,srcY,duration;)...
case /^animation=[0-9]+;.*;$/.test(line):
key = line.split(/[=;]/)[1]; value = line.split(/;/).slice(1,-1);
value = value.map(x => x.split(/,/));
value.forEach(x => x[2] = parseInt(x[2]));
if (!ref.animation) ref.animation = []; ref.animation[key] = value;
break;
+ // frame duration from animation file (im millisec)
case /^duration=[0-9]+ms$/.test(line):
ref["duration"] = line.split(/=|ms$/)[1];
break;
+ // frame duration from animation file (in whole seconds)
case /^duration=[0-9]+s$/.test(line):
ref["duration"] = line.split(/=|s$/)[1] * 1000;
break;
+ // general numeric value (key=#)
case /^[^#].*=[0-9]+$/.test(line):
key = line.split(/[=]/)[0]; value = line.split(/=/).slice(1) * 1;
if (!ref[key]) ref[key] = value;
else if (!Array.isArray(ref[key])) ref[key] = [ref[key],value];
else if ( Array.isArray(ref[key])) ref[key].push(value);
break;
+ // general key=value (non-numeric or non-scalar)
case /^[^#].*=.+$/.test(line):
key = line.split(/[=]/)[0]; value = line.split(/=/).slice(1).join("=");
if (!ref[key]) ref[key] = value;
}
function Map(textdef) {
- this.frametime = performance.now();
+ // object for map operations (drawing coorinate transformation, etc.)
this.info = gamedata.load(textdef);
- this.tileset = gamedata.load(this.info.header.tileset);
- gfx.load(this.tileset.img);
+ const tileset = gamedata.load(this.info.header.tileset);
+ const frametime = performance.now();
+ gfx.load(tileset.img);
- var h = this.info.header.height, w = this.info.header.width;
- var th = this.info.header.tileheight, tw = this.info.header.tilewidth;
+ const h = this.info.header.height, w = this.info.header.width;
+ const th = this.info.header.tileheight, tw = this.info.header.tilewidth;
var posx = canvas.canvas.width / 2, posy = canvas.canvas.height / 2 - h * th/2;
canvas.fillStyle = "rgba("+this.info.header.background_color+")";
+ // precalculated tile positions
+ // assign x/y coordinates to each tile index
+ // looks dumb but is faster than on the fly isometric calculations
+ const dx = [], dy = [];
+ for ( let y = 0; y < h; y++ ) for ( let x = 0; x < w; x++ ) {
+ dx[y * w + x] = (w + x - y) * tw / 2;
+ dy[y * w + x] = (x + y) * th / 2;
+ }
+
+ const npcs = [];
+ for (let def of this.info.npc) {
+ let npc = new Npc(def.filename)
+ let loc = def.location.split(',')[1] * 1 * w + def.location.split(',')[0] * 1;
+ npc.place(dx[loc], dy[loc]);
+ npcs[loc] = npc;
+ this.info.layer.find(l => l.type == "collision").data[loc] = 1;
+ }
+
+ // tile index for pixel position on map
this.tileAt = function(x, y) {
- nx = (y + th / 2) / th + (x - w * tw / 2) / tw |0;
- ny = (y + th / 2) / th - (x - w * tw / 2) / tw |0;
+ var r = (y + th / 2) / th; var c = (x - w * tw /2) / tw;
+ var nx = r + c |0; var ny = r - c |0;
return ny * w + nx;
}
+ // vice versa the pixel coordinates of a given map tile
+ this.positionOf = tile => [dx[tile], dy[tile]];
+ this.xOf = tile => dx[tile];
+ this.yOf = tile => dy[tile];
+
+ // center map to pixel position (by setting drawing offsets)
this.center = function(x, y) {
posx = canvas.canvas.width / 2 - x;
posy = canvas.canvas.height / 2 - y;
return this;
}
+ // draw the entire map, including all mobs
+ // mobs in an array of all heros, enemies, loot, npcs, etc.
this.draw = function(mobs) {
- var x, y, dx, dy, i;
- var bg = this.info.layer.find(l => l.type == "background").data;
- var ob = this.info.layer.find(l => l.type == "object").data;
- var mm = [];
+ const bg = this.info.layer.find(l => l.type == "background").data;
+ const ob = this.info.layer.find(l => l.type == "object").data;
+ var i, mm = [];
+
+ // mobs only have x/y pixel positions,
+ // to draw them in order with map tiles we set up
+ // an array with current tile positions of mobs
mobs.forEach(m => {
- i = this.tileAt(m.position[0], m.position[1]);
+ let i = this.tileAt(m.position[0], m.position[1]);
mm[i] = mobs.filter(m => i == this.tileAt(m.position[0], m.position[1]));
});
canvas.fillRect(0,0, canvas.canvas.width, canvas.canvas.height);
- for ( y = 0; y < h; y++ ) for ( x = 0; x < w; x++ ) {
- i = y * h + x;
- dx = posx + (w + x - y) * tw /2;
- dy = posy + (x + y) * th / 2;
- this.draw_tile(bg[i], dx, dy);
- }
- for ( y = 0; y < h; y++ ) for ( x = 0; x < w; x++ ) {
- i = y * h + x;
- dx = posx + (w + x - y) * tw /2;
- dy = posy + (x + y) * th / 2;
- this.draw_tile(ob[i], dx, dy);
- if (mm[i]) mm[i].forEach(m => m.draw(m.position[0] + posx, m.position[1] + posy));
+ // draw background layer first
+ for ( i = 0; i < h * w; i++ ) draw_tile(bg[i], posx + dx[i], posy + dy[i]);
+
+ // draw object layer and mobs
+ for ( i = 0; i < h * w; i++ ) {
+ draw_tile(ob[i], posx + dx[i], posy + dy[i]);
+ if (mm[i]) mm[i].forEach(m => m.draw(posx + m.position[0], posy + m.position[1]));
+ if (npcs[i]) npcs[i].draw(posx + dx[i], posy + dy[i]);
}
}
- this.draw_tile = function(tile, x, y) {
+ // draw a single map tile at screen position x/y
+ // tile may be animated, if so defined in tiledef
+ function draw_tile(tile, x, y) {
+ const t = tileset.tile[tile];
+ const f = tileset.animation[tile];
x = x |0; y = y |0;
- var t = this.tileset.tile[tile];
- var f = this.tileset.animation[tile];
if (t && f) {
- 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]);
+ frame = ((performance.now() - frametime) / f[0][2] |0) % f.length;
+ canvas.drawImage(gfx[tileset.img], f[frame][0], f[frame][1], t[2], t[3],
+ x - t[4], y - t[5], t[2], t[3]);
} else if (t) {
- canvas.drawImage(gfx[this.tileset.img], t[0], t[1], t[2], t[3],
- x - t[4], y - t[5], t[2], t[3]);
+ canvas.drawImage(gfx[tileset.img], t[0], t[1], t[2], t[3],
+ x - t[4], y - t[5], t[2], t[3]);
}
}
}
function Mob(textdef) {
+ // any mobile object, mostly for gfx representation
+ // may be hero, enemy, loot, npc, etc.
this.position = [0, 0];
- var info = gamedata.load(textdef);
+ const info = gamedata.load(textdef);
var direction = 0;
var animation = "stance";
var previous_animation = "";
var frametime = performance.now();
gfx.load(info.image)
- this.place = function(x, y) { this.position = [x, y]; return this; }
+ // some simplified npc files do not define animation frames
+ // render size and offset are given instead, and we
+ // assume, that we can just loop horizontally over the image
+ if (!info[animation].frame){
+ info[animation].frame = [];
+ let rs = info.render_size.split(/,/); rs = [ rs[0] * 1, rs[1] * 1 ];
+ let ro = info.render_offset.split(/,/); ro = [ ro[0] * 1, ro[1] * 1 ];
+
+ for (let i = 0; i < info[animation].frames; i++ )
+ info[animation].frame[i] = [[ i * rs[0], 0, rs[0], rs[1], ro[0], ro[1]]];
+ }
+
+ // place mob on x/y pixel coordinates
+ // e.g. when spawning, walking, etc.
+ this.place = function(x, y) {
+ this.position[0] = x, this.position[1] = y;
+ return this;
+ }
+
+ // change facing direction of mob
this.direct = function(d) { direction = d % 8; return this; }
+
+ // set animation cycle for drawing
+ // play_once animations will automatically fall back
+ // to previous loop after completion
this.animate = function(a) {
if ( a != animation ) {
previous_animation = animation;
return this;
}
+ // draw this mob to screen position x/y
this.draw = function(x, y){
var f, a = info[animation];
- var frame = ( performance.now() - frametime ) * a.frames / a.duration | 0;
+ var f, frame = ( performance.now() - frametime ) * a.frames / a.duration | 0;
+ // determine current animation frame
switch(a.type){
case "looped":
frame = frame % a.frames;
f[2], f[3]);
}
+ // shortcut functions for specific animations
this.block = () => this.animate("block" );
this.cast = () => this.animate("cast" );
this.die = () => this.animate("die" );
this.swing = () => this.animate("swing" );
}
+function Npc(textdef){
+ this.info = gamedata.load(textdef);
+ const avatar = new Mob(this.info.gfx);
+
+ this.place = function(x, y) {
+ avatar.place(x,y);
+ return this;
+ }
+
+ this.draw = function(x, y) {
+ avatar.draw(x, y);
+ return this;
+ }
+}
+
function Hero(gender = "female", hair = "short"){
+ // Object for player character
+ // unique in single player
this.position = [0,0];
this.stats = gamedata.load("/engine/stats.txt");
- var layers = gamedata.load("/engine/hero_layers.txt");
- var hair = (gender == "female")?"long":hair;
+ const layers = gamedata.load("/engine/hero_layers.txt");
var direction = 0, animation = "stance";
+ hair = (gender == "female")?"long":hair;
- limbs = {
+ // hero consists of multiple mobs, one for each clothing/item overlay
+ var limbs = {
head : new Mob("/animations/avatar/"+gender+"/head_"+hair+".txt"),
- chest: new Mob("/animations/avatar/"+gender+"/default_chest.txt"),
+ chest: new Mob("/animations/avatar/"+gender+"/cloth_shirt.txt"),
hands: new Mob("/animations/avatar/"+gender+"/default_hands.txt"),
- legs : new Mob("/animations/avatar/"+gender+"/default_legs.txt"),
+ legs : new Mob("/animations/avatar/"+gender+"/cloth_pants.txt"),
feet : new Mob("/animations/avatar/"+gender+"/default_feet.txt"),
- main : new Mob("/animations/avatar/"+gender+"/dagger.txt"),
- off : new Mob("/animations/avatar/"+gender+"/shield.txt")
+ main : null, // main hand, e.g. melee weapon, magic weapon
+ off : null // off hand, e.g. shield, ranged weapon
}
+ // "dress" the player, i.e. assign clothing/item to limb
this.dress = function(limb, item) {
limbs[limb] = new Mob("/animations/avatar/"+gender+"/"+item+".txt")
limbs[limb].place(this.position[0], this.position[1]).direct(direction);
return this;
}
+ // // Wrapper functions for Mob class // //
+
+ // place all mobs beloning to hero (when spawning, walking, teleporting, etc.)
this.place = function(x,y) {
- this.position = [x,y];
- for (var limb in limbs) limbs[limb].place(x,y);
+ this.position[0] = x, this.position[1] = y;
+ for (var limb in limbs) limbs[limb] && limbs[limb].place(x,y);
return this;
}
+ // change facing direction of hero (i.e. of all mobs)
this.direct = function(d) {
direction = d;
- for (var limb in limbs) limbs[limb].direct(d);
+ for (var limb in limbs) limbs[limb] && limbs[limb].direct(d);
return this;
}
+ // start animation cycle
this.animate = function(anim){
animation = anim;
- for (var limb in limbs) limbs[limb].animate(anim);
+ for (var limb in limbs) limbs[limb] && limbs[limb].animate(anim);
return this;
}
this.draw = function(x, y){
- layers.layer[direction].forEach(limb => limbs[limb].draw(x, y));
+ layers.layer[direction].forEach(limb => limbs[limb] && limbs[limb].draw(x, y));
return this;
}
+ // shortcuts for animation
this.block = () => this.animate("block" );
this.cast = () => this.animate("cast" );
this.die = () => this.animate("die" );
}
function Controls(hero, map){
+ // processes keyboard / touch / mouse
+ // causes according player actions
+ // single player only, conrol will be assigned to server in multi player
var kbdmap = {
up: 87, altup: 38,
down: 83, altdown: 40,
window.addEventListener("keyup" , e => keys[e.keyCode] = false);
setInterval(() => input(), 33.33)
+ // cause player to walk, processes blocked terrain and player speed
+ // x/y are factors of speed and direction
+ // i.e. +/-1 for diagonal movement
+ // and +/-1.4 for horizontal/vertical movement
function translate(x, y){
var sx = map.info.header.tilewidth * hero.stats.speed / 33.33;
var sy = map.info.header.tileheight * hero.stats.speed / 33.33;
map.center(hero.position[0], hero.position[1]);
}
+ // process input and decide on according action
function input(){
+ // facing directions, indexed by OR of key press combinations
const dir = [ -1, 0, 4, -1, 2, 1, 3, 2, 6, 7, 5, 6, -1, 0, 4, -1 ];
+ // translation speed and direction, indexed by facing direction of movement
const trans = [ [-1.4,0], [-1,-1], [0,-1.4], [1,-1], [1.4,0], [1,1], [0,1.4], [-1,1] ];
var k = 0;
+ // OR of direction key presses
k += (keys[kbdmap.left] || keys[kbdmap.altleft]) ? 1 : 0;
k += (keys[kbdmap.right] || keys[kbdmap.altright]) ? 2 : 0;
k += (keys[kbdmap.up] || keys[kbdmap.altup]) ? 4 : 0;
canvas.canvas.height = window.innerHeight;
});
+// player = new Mob("animations/enemies/zombie.txt"); player.stats = { speed: 3 };
player = new Hero();
map = new Map("/maps/arrival.txt");
-player.place(map.info.header.hero_pos.split(/,/)[0] * map.info.header.tilewidth,
- map.info.header.hero_pos.split(/,/)[1] * map.info.header.tileheight);
-player.direct(5).stance();
+player.place(map.xOf(map.info.header.hero_pos.split(',')[1] * 1 * map.info.header.width + map.info.header.hero_pos.split(',')[0] * 1),
+ map.yOf(map.info.header.hero_pos.split(',')[1] * 1 * map.info.header.width + map.info.header.hero_pos.split(',')[0] * 1));
+player.direct(6).stance();
map.center(player.position[0], player.position[1]);
c = new Controls(player, map);
-setInterval (() => map.draw([player]), 16.66 );
+setInterval (() => map.draw([player]), 33.33 );
projects / flarejs / blobdiff