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infinite_land.js
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infinite_land.js
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(function(){
var paper,
universe_seed = 19870910;
jQuery(document).ready(function(){
var canvas_element = jQuery('#canvas');
paper = Raphael('canvas',canvas_element.width(),canvas_element.height());
MainScene();
});
var MainScene = function(){
var zone_manager = ZoneManager(8,8,universe_seed),
hero = Player(zone_manager,0,0,5,5),
tile_manager = TileManager(16,hero);
tile_manager.render();
jQuery(document).keydown(function(e){
if(e.keyCode === 37 || e.keyCode === 38 || e.keyCode === 39 || e.keyCode === 40){
var vx = 0,
vy = 0,
map = hero.active_zone.map;
if(e.keyCode === 37 && (hero.map_x - 1 < 0 || map[hero.map_y][hero.map_x - 1])){
vx -= 1;
}
if(e.keyCode === 38 && (hero.map_y - 1 < 0 || map[hero.map_y - 1][hero.map_x])){
vy -= 1;
}
if(e.keyCode === 39 && (hero.map_x + 1 > map[0].length - 1 || map[hero.map_y][hero.map_x + 1])){
vx += 1;
}
if(e.keyCode === 40 && (hero.map_y + 1 > map.length - 1 || map[hero.map_y + 1][hero.map_x])){
vy += 1;
}
hero.move_by(vx,vy);
tile_manager.render();
}
});
};
var TileManager = function(tile_size,hero){
var self = {},
width = hero.active_zone.width,
height = hero.active_zone.height,
offset_left = (paper.width / 2) - (tile_size / 2),
offset_top = (paper.height / 2) - (tile_size / 2),
tile_x,
tile_y,
tile,
tile_set = [];
for(var i = 0, x, y; i < 9; i += 1){
tile_set[i] = [];
for(y = 0; y < height; y += 1){
tile_set[i][y] = [];
for(x = 0; x < width; x += 1){
tile_x = (x - y) * (tile_size / 2) + (paper.width / 2) - (tile_size);
tile_y = (x + y) * (tile_size / 4) + (paper.height / 4) - (tile_size / 2);
tile_set[i][y][x] = Tile(tile_x,tile_y,tile_size,1);
}
}
}
self.render = function(){
var map = hero.active_zone.map,
local_left = (hero.map_x - hero.map_y) * (tile_size / 2) + (paper.width / 2) - (tile_size),
local_top = (hero.map_x + hero.map_y) * (tile_size / 4) + (paper.height / 4) - (tile_size / 2);
var maps = [ hero.active_zones.nw.map,
hero.active_zones.n.map,
hero.active_zones.ne.map,
hero.active_zones.w.map,
hero.active_zone.map,
hero.active_zones.e.map,
hero.active_zones.sw.map,
hero.active_zones.s.map,
hero.active_zones.se.map];
draw_chunks(tile_set[0],maps[0],local_left,local_top,0,0 - tile_size * height * 2);
draw_chunks(tile_set[1],maps[1],local_left,local_top,tile_size * width,0 - tile_size * height);
draw_chunks(tile_set[2],maps[2],local_left,local_top,tile_size * width * 2,0);
draw_chunks(tile_set[3],maps[3],local_left,local_top,0 - tile_size * width,0 - tile_size * height);
draw_chunks(tile_set[4],maps[4],local_left,local_top,0,0,true);
draw_chunks(tile_set[5],maps[5],local_left,local_top,tile_size * width,tile_size * height);
draw_chunks(tile_set[6],maps[6],local_left,local_top,0 - tile_size * width * 2,0);
draw_chunks(tile_set[7],maps[7],local_left,local_top,0 - tile_size * width,tile_size * height);
draw_chunks(tile_set[8],maps[8],local_left,local_top,0,tile_size * height * 2);
};
var draw_chunks = function(tiles,map,local_left,local_top,offset_x,offset_y,show_center){
var tile,
f,
h,
tile_x,
tile_y;
offset_x /= 2;
offset_y /= 4;
for(var y = 0, x; y < height; y += 1){
for(x = 0; x < width; x += 1){
tile = tiles[y][x];
tile_x = (x - y) * (tile_size / 2) + (paper.width / 2) - (tile_size) + offset_x;
tile_y = (x + y) * (tile_size / 4) + (paper.height / 4) - (tile_size / 2) + offset_y;
tile.x = tile_x - local_left + (paper.width / 2) - (tile_size);
tile.y = tile_y - local_top + (paper.height / 2) - (tile_size / 2);
if(map[y][x] <= 52){
f = 'rgba(0,0,200,1)';
h = 4;
}else if(map[y][x] > 52 && map[y][x] <= 62){
f = 'rgba(200,200,0,1)';
h = 8;
}else if(map[y][x] > 62 && map[y][x] <= 78){
f = 'rgba(0,200,0,1)';
h = 12;
}else if(map[y][x] > 78){
f = 'rgba(230,230,230,1)';
h = 16;
}
if(hero.map_x === x && hero.map_y === y && show_center){
f = '#880000';
h += 4;
}
tile.fill = f;
tile.height = h;
tile.render();
}
}
};
return self;
};
var Player = function(zone_manager,zone_x,zone_y,map_x,map_y){
var self = {};
self.active_zone;
self.zone_x = zone_x;
self.zone_y = zone_y;
self.map_x = map_x;
self.map_y = map_y;
self.active_zone = zone_manager.get_zone(self.zone_x,self.zone_y);
self.active_zones = { 'nw':zone_manager.get_zone(self.zone_x - 1,self.zone_y - 1),
'n' :zone_manager.get_zone(self.zone_x + 0,self.zone_y - 1),
'ne':zone_manager.get_zone(self.zone_x + 1,self.zone_y - 1),
'w' :zone_manager.get_zone(self.zone_x - 1,self.zone_y + 0),
'e' :zone_manager.get_zone(self.zone_x + 1,self.zone_y + 0),
'sw':zone_manager.get_zone(self.zone_x - 1,self.zone_y + 1),
's' :zone_manager.get_zone(self.zone_x + 0,self.zone_y + 1),
'se':zone_manager.get_zone(self.zone_x + 1,self.zone_y + 1)};
self.move_by = function(vx,vy){
self.map_x += vx;
self.map_y += vy;
if(self.map_x < 0 || self.map_x > self.active_zone.width - 1 || self.map_y < 0 || self.map_y > self.active_zone.height - 1){
if(self.map_x < 0){
self.zone_x -= 1;
self.map_x = self.active_zone.width - 1;
}else if(self.map_x > self.active_zone.width - 1){
self.zone_x += 1;
self.map_x = 0;
}else if(self.map_y < 0){
self.zone_y -= 1;
self.map_y = self.active_zone.height - 1;
}else if(self.map_y > self.active_zone.height - 1){
self.zone_y += 1;
self.map_y = 0;
}
self.active_zone = zone_manager.get_zone(self.zone_x,self.zone_y);
self.active_zones = { 'nw':zone_manager.get_zone(self.zone_x - 1,self.zone_y - 1),
'n' :zone_manager.get_zone(self.zone_x + 0,self.zone_y - 1),
'ne':zone_manager.get_zone(self.zone_x + 1,self.zone_y - 1),
'w' :zone_manager.get_zone(self.zone_x - 1,self.zone_y + 0),
'e' :zone_manager.get_zone(self.zone_x + 1,self.zone_y + 0),
'sw':zone_manager.get_zone(self.zone_x - 1,self.zone_y + 1),
's' :zone_manager.get_zone(self.zone_x + 0,self.zone_y + 1),
'se':zone_manager.get_zone(self.zone_x + 1,self.zone_y + 1)};
}
};
return self;
};
var ZoneManager = function(zone_width,zone_height,seed){
var self = {};
self.get_zone = function(x,y){
return Zone(seed,zone_width,zone_height,x,y);
};
return self;
};
var Zone = function(seed,width,height,nx,ny){
var self = {},
range = height,
c0,
c1,
c2,
c3,
ht;
var nw = ~~(new Alea(new Alea(seed + (nx + 0))() + new Alea(seed + (ny + 0))())() * 255),
ne = ~~(new Alea(new Alea(seed + (nx + 1))() + new Alea(seed + (ny + 0))())() * 255),
sw = ~~(new Alea(new Alea(seed + (nx + 0))() + new Alea(seed + (ny + 1))())() * 255),
se = ~~(new Alea(new Alea(seed + (nx + 1))() + new Alea(seed + (ny + 1))())() * 255);
self.width = width;
self.height = height;
self.map = [];
for(var y = 0, x; y < height; y += 1){
self.map[y] = [];
for(x = 0; x < width; x += 1){
c0 = calculate_height(0,0,x,y,nw,0,range);
c1 = calculate_height(width - 1,0,x,y,ne,0,range);
c2 = calculate_height(width - 1,height - 1,x,y,se,0,range);
c3 = calculate_height(0,height - 1,x,y,sw,0,range);
ht = ~~((c0 + c1 + c2 + c3 + 127) / 5);
self.map[y][x] = ht;
}
}
return self;
};
var Tile = function(x,y,size,height){
var self = {},
old_height,
old_fill,
old_x,
old_y,
path = paper.path('');
path.attr('stroke-width',0);
self.height = height;
self.fill;
self.x = x;
self.y = y;
self.render = function(){
if(self.height !== old_height || old_x !== self.x || old_y !== self.y){
var vertices = [];
vertices.push((size + self.x) + ',' + (size / 4 - self.height + self.y));
vertices.push((size + self.x) + ',' + (size / 4 + self.y));
vertices.push((size / 2 + self.x) + ',' + (size / 2 + self.y));
vertices.push((0 + self.x) + ',' + (size / 4 + self.y));
vertices.push((0 + self.x) + ',' + ((size / 4 - self.height) + self.y));
var path_str = 'M ' + ((size / 2 + self.x) + ',' + (0 - self.height + self.y)) + ' L ' + vertices.join(" ") + ' Z';
path.attr('path',path_str);
old_height = self.height;
old_x = self.x;
old_y = self.y;
}
if(self.fill !== old_fill){
path.attr('fill',self.fill);
old_fill = self.fill;
}
};
return self;
};
// calculates the distance between two points and selects a coresponding color
var calculate_height = function(center_x,center_y,x,y,ht_begin,ht_end,range){
var rb = ht_begin,
re = ht_end,
rd = rb - re;
var dx = center_x - x,
dy = center_y - y,
d = Math.sqrt((dx * dx) + (dy * dy)) / range,
rn = ~~(rb - (rd * d));
if(rn < re) rn = re;
return rn;
};
})();