From b31d4148dec78787850d73a1356126bd6a4ced5f Mon Sep 17 00:00:00 2001
From: =?utf8?q?Paul=20H=C3=A4nsch?= <paul@plutz.net>
Date: Thu, 13 Feb 2020 02:00:35 +0100
Subject: [PATCH] npc loading

---
 engine.js | 50 ++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 46 insertions(+), 4 deletions(-)

diff --git a/engine.js b/engine.js
index 0750e87..281debb 100644
--- a/engine.js
+++ b/engine.js
@@ -1,6 +1,6 @@
 var gamedata = {
   // associative array for gamedata files
-  load: def => this[def] ? this[def] : this[def] = new Textfile(def)
+  load: function(def) { return this[def] ? this[def] : this[def] = new Textfile(def); }
 }
 var gfx = {
   // associative array for game graphics
@@ -124,6 +124,15 @@ function Map(textdef) {
     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) {
     var r = (y + th / 2) / th; var c = (x - w * tw /2) / tw;
@@ -131,6 +140,11 @@ function Map(textdef) {
     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;
@@ -161,6 +175,7 @@ function Map(textdef) {
     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]);
     }
   }
 
@@ -193,6 +208,18 @@ function Mob(textdef) {
   var frametime = performance.now();
   gfx.load(info.image)
 
+  // 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) {
@@ -260,6 +287,21 @@ function Mob(textdef) {
   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
@@ -403,9 +445,9 @@ window.addEventListener("resize", function(){
 // 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);
-- 
2.39.2