initial commit

engine/class.lua

@@ -0,0 +1,7 @@
+Class = {}
+Class.__index = Class
+
+function Class:new(tbl)
+	tbl = tbl or {}
+	setmetatable(tbl, { __index = self })
+end

engine/collision.lua

@@ -0,0 +1,61 @@
+collision = {}
+collision.colliders = {}
+
+collision.debug = false
+
+function collision.draw()
+	for _, v in pairs(collision.colliders) do
+		gfx.rect(v.x, v.y, v.w, v.h, gfx.COLOR_BLUE)
+	end
+end
+
+function collision.add(tbl)
+	table.insert(collision.colliders, tbl)
+end
+
+function collision.remove(index)
+	table.remove(collision.colliders, index)
+end
+
+function collision.move(aabb, dx, dy)
+	local normal = { x = 0, y = 0 }
+	if aabb.normal ~= nil then
+		aabb.normal = normal
+	end
+
+	-- move x
+	aabb.x = aabb.x + dx
+
+	for _, v in pairs(collision.colliders) do
+		if aabb ~= v and collision.aabb_check(aabb, v) then
+			if dx > 0 then
+				aabb.x = v.x - aabb.w
+				normal.x = -1
+			elseif dx < 0 then
+				aabb.x = v.x + v.w
+				normal.x = 1
+			end
+		end
+	end
+
+	-- move y
+	aabb.y = aabb.y + dy
+
+	for _, v in pairs(collision.colliders) do
+		if aabb ~= v and collision.aabb_check(aabb, v) then
+			if dy > 0 then
+				aabb.y = v.y - aabb.h
+				normal.y = -1
+			elseif dy < 0 then
+				aabb.y = v.y + v.h
+				normal.y = 1
+			end
+		end
+	end
+
+	return normal
+end
+
+function collision.aabb_check(a, b)
+	return a.x < b.x + b.w and b.x < a.x + a.w and a.y < b.y + b.h and b.y < a.y + a.h
+end

engine/vector.lua

@@ -0,0 +1,24 @@
+vector = {}
+vector.utils = {}
+
+function vec(x, y)
+	return {
+		x = x,
+		y = y,
+	}
+end
+
+function vector.utils.input_vector()
+	local vec = { x = 0, y = 0 }
+	vec.x = vector.utils.bool_to_int(input.held(input.RIGHT)) - vector.utils.bool_to_int(input.held(input.LEFT))
+	vec.y = vector.utils.bool_to_int(input.held(input.DOWN)) - vector.utils.bool_to_int(input.held(input.UP))
+	return vec
+end
+
+function vector.utils.bool_to_int(b)
+	if b == true then
+		return 1
+	else
+		return 0
+	end
+end