viewport

3 files changed, 45 insertions, 4 deletions

diff --git a/evloop.lua b/evloop.lua
index 57e15c0..6c12c3a 100644
--- a/evloop.lua
+++ b/evloop.lua
@@ -97,8 +97,8 @@ function M.mainloop(start)
 		if not resume_task(main, {"update", dt}) then return 0 end
 
 		if love.graphics and love.graphics.isActive() then
-			love.graphics.origin()
 			love.graphics.clear(love.graphics.getBackgroundColor())
+			require "viewport".origin()
 			if not resume_task(main, {"draw", dt}) then return 0 end
 			love.graphics.present()
 		end
diff --git a/main.lua b/main.lua
index 73f762b..6a53f05 100644
--- a/main.lua
+++ b/main.lua
@@ -1,4 +1,5 @@
 local evloop = require "evloop"
+local viewport = require "viewport"
 local playfield = require "game.playfield"
 local tetrominoes = require "game.tetrominoes"
 
@@ -8,8 +9,7 @@ local piece
 local function draw()
 	evloop.poll "draw"
 
-	local _, height = love.graphics.getDimensions()
-	local size = height / field.lines
+	local size = viewport.height / field.lines
 
 	love.graphics.setColor(0.1, 0.1, 0.1)
 	love.graphics.rectangle("fill",
@@ -18,7 +18,7 @@ local function draw()
 
 	local function draw_block(line, column)
 		local x = (column - 1) * size
-		local y = height - line * size
+		local y = viewport.height - line * size
 		love.graphics.rectangle("fill", x, y, size, size)
 	end
 
diff --git a/viewport.lua b/viewport.lua
new file mode 100644
index 0000000..e54c9d8
--- /dev/null
+++ b/viewport.lua
@@ -0,0 +1,41 @@
+local M = {}
+
+M.width, M.height = 1920, 1080
+
+local dims = {love.graphics.getDimensions()}
+
+function M.scale()
+	local sw, sh = unpack(dims)
+	local vw, vh = unpack(M)
+	local scalex, scaley = sw / vw, sh / vh
+	if scalex * vh < sh then
+		return scalex
+	else
+		return scaley
+	end
+end
+
+function M.offset()
+	local sw, sh = unpack(dims)
+	local vw, vh = unpack(M)
+	local sc = M.scale()
+	local x, y = sw / 2 - vw * sc / 2, sh / 2 - vh * sc / 2
+	return x, y
+end
+
+function M.pos(win_x, win_y)
+	local x, y = M.offset()
+	local sc = M.scale()
+	return (win_x - x) / sc, (win_y - y) / sc
+end
+
+function M.origin()
+	dims = {love.graphics.getDimensions()}
+	M[1], M[2] = M.width, M.height
+
+	love.graphics.origin()
+	love.graphics.translate(M.offset())
+	love.graphics.scale(M.scale())
+end
+
+return M