pico-8 cartridge // http://www.pico-8.com version 42 __lua__ local TILESIZE = 8 local player = { -- Cell coordinates cx = 8, cy = 8, -- 0-1 ratio values for the position within a grid cell xr = 0, yr = 0, -- Pixel coordinates xx = 0, yy = 0, -- Movements dx = 0, dy = 0, setCoordinates = function(self, x, y) self.xx = x self.yy = y self.cx = flr(self.xx / TILESIZE) self.xy = flr(self.yy / TILESIZE) self.xr = (self.xx - self.cx * TILESIZE) / TILESIZE self.xy = (self.yy - self.cy * TILESIZE) / TILESIZE end, update = function(self) -- Apply gravity self.dy = self.dy + 0.05 self.dy = min(self.dy, 0.98) self.xr = self.xr + self.dx self.yr = self.yr + self.dy -- self.dy = self.dy * 0.8 if abs(self.dx) < 0.001 then self.dx = 0 end if abs(self.dy) < 0.001 then self.dy = 0 end -- Collision right if hasCollision(self.cx + 1, self.cy) and self.xr >= 0.75 then self.xr = 0.75 self.dx = 0 end -- Collision left if hasCollision(self.cx - 1, self.cy) and self.xr <= 0.25 then self.xr = 0.25 self.dx = 0 end -- Collision up if hasCollision(self.cx, self.cy - 1) and self.yr <= 0.375 then self.yr = 0.375 self.dy = 0 end -- Collision down if hasCollision(self.cx, self.cy + 1) and self.yr >= 0.5 then self.yr = 0.5 self.dy = 0 end while self.xr > 1 do self.xr = self.xr - 1 self.cx = self.cx + 1 end while (self.xr < 0) do self.xr = self.xr + 1 self.cx = self.cx - 1 end while (self.yr > 1) do self.yr = self.yr - 1 self.cy = self.cy + 1 end while (self.yr < 0) do self.yr = self.yr + 1 self.cy = self.cy - 1 end end, postUpdate = function(self) self.dx = 0 self.xx = (self.cx + self.xr) * TILESIZE self.yy = (self.cy + self.yr) * TILESIZE end } function hasCollision(x, y) -- Implement collision detection logic here return fget(mget(x, y), 0) end function _init() end local frames = 0 function _update() frames = frames + 1 --left if btn(0) then player.dx = -0.1 end -- right if btn(1) then player.dx = 0.1 end -- Up if btnp(2) then player.dy = -0.45 end player:update() end function _draw() cls() map() -- Draw the sprite with a -4,-4 offset, to center it on the player's position spr(((frames / 30) % 4) > 1 and 2 or 3, player.xx - 4, player.yy - 4) print("cell: " .. player.cx + player.xr .. ", " .. player.cy + player.yr, 1, 1, 7) print("pos: " .. flr(player.xx) .. 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