commit 36f0188f0f02a52d0c239a613f97be6decfb8577
Author: Matthew Ryan Dillon <matthew@akdillon.net>
Date: Sat Dec 28 21:59:15 2024 -0500
initial
diff --git a/main.lua b/main.lua
new file mode 100644
index 0000000..4dee6ac
--- /dev/null
+++ b/main.lua
@@ -0,0 +1,246 @@
+function love.load()
+ p2 = math.pi / 2
+ p3 = 3 * math.pi / 2
+
+ fov = 30
+
+ love.graphics.setBackgroundColor(0.3, 0.3, 0.3, 1)
+ love.window.setMode(1024, 512)
+
+ player = {}
+ player["x"] = 300
+ player["y"] = 300
+ player["size"] = 8
+ player["angle"] = 0
+ player["dx"] = math.cos(player.angle) * 5
+ player["dy"] = math.sin(player.angle) * 5
+
+ map = {}
+ map["x"] = 8
+ map["y"] = 8
+ map["size"] = 64
+
+ map["map"] = {
+ 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 0, 1, 0, 0, 0, 0, 1,
+ 1, 0, 1, 0, 0, 0, 0, 1,
+ 1, 0, 1, 0, 0, 0, 0, 1,
+ 1, 0, 0, 0, 0, 0, 0, 1,
+ 1, 0, 0, 0, 0, 1, 0, 1,
+ 1, 0, 0, 0, 0, 0, 0, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1,
+ }
+end
+
+function love.update()
+ if love.keyboard.isDown("a") then
+ player.angle = player.angle - 0.1
+ if player.angle < 0 then player.angle = player.angle + 2 * math.pi end
+ player.dx = math.cos(player.angle) * 5
+ player.dy = math.sin(player.angle) * 5
+ end
+ if love.keyboard.isDown("d") then
+ player.angle = player.angle + 0.1
+ if player.angle > 2 * math.pi then player.angle = player.angle - 2 * math.pi end
+ player.dx = math.cos(player.angle) * 5
+ player.dy = math.sin(player.angle) * 5
+ end
+ if love.keyboard.isDown("w") then
+ player.x = player.x + player.dx
+ player.y = player.y + player.dy
+ end
+ if love.keyboard.isDown("s") then
+ player.x = player.x - player.dx
+ player.y = player.y - player.dy
+ end
+end
+
+function love.draw()
+ drawMap()
+ drawPlayer()
+ drawRays3D()
+end
+
+function drawPlayer()
+ love.graphics.setColor(1, 1, 0)
+ love.graphics.rectangle("fill",
+ player.x - player.size / 2, player.y - player.size / 2,
+ player.size, player.size
+ )
+ love.graphics.line(player.x, player.y, player.x + player.dx * 5, player.y + player.dy * 5)
+end
+
+function drawMap()
+ for y = 1, map.y do
+ for x = 1, map.x do
+ local color = map.map[(y - 1) * map.x + x]
+ love.graphics.setColor(color, color, color)
+ local xo = (x - 1) * map.size
+ local yo = (y - 1) * map.size
+ love.graphics.polygon("fill",
+ xo + 1, yo + 1,
+ xo + 1, yo + map.size - 1,
+ xo + map.size - 1, yo + map.size - 1,
+ xo + map.size - 1, yo + 1
+ )
+ end
+ end
+end
+
+function dist(ax, ay, bx, by, ang)
+ return math.sqrt((bx - ax) * (bx - ax) + (by - ay) * (by - ay))
+end
+
+function drawRays3D()
+ local ray = {}
+ ray["angle"] = player.angle - math.rad(fov)
+ ray["x"] = 0
+ ray["y"] = 0
+ ray["xo"] = 0
+ ray["yo"] = 0
+ ray["mx"] = 0
+ ray["my"] = 0
+ ray["mp"] = 0
+
+ if ray.angle < 0 then
+ ray.angle = ray.angle + 2 * math.pi
+ end
+ if ray.angle > 2 * math.pi then
+ ray.angle = ray.angle - 2 * math.pi
+ end
+
+ for r = 1, fov * 2 do
+ local dof = 0
+ local disT = 0
+ local disH = 1000000
+ local hx = player.x
+ local hy = player.y
+
+ local aTan = -1 / math.tan(ray.angle)
+
+ if (ray.angle > math.pi) then
+ ray.y = bit.lshift(bit.rshift(player.y, 6), 6) - 0.0001
+ ray.x = (player.y - ray.y) * aTan + player.x
+ ray.yo = -map.size
+ ray.xo = -ray.yo * aTan
+ end
+
+ if (ray.angle < math.pi) then
+ ray.y = bit.lshift(bit.rshift(player.y, 6), 6) + map.size
+ ray.x = (player.y - ray.y) * aTan + player.x
+ ray.yo = map.size
+ ray.xo = -ray.yo * aTan
+ end
+
+ if ray.angle == 0 or ray.angle == math.pi then
+ ray.x = player.x
+ ray.y = player.y
+ dof = 8
+ end
+
+ while dof < 8 do
+ ray.mx = bit.rshift(ray.x, 6)
+ ray.my = bit.rshift(ray.y, 6)
+ ray.mp = ray.my * map.x + ray.mx
+ if ray.mp > 0 and ray.mp < (map.x * map.y + 1) and map.map[ray.mp + 1] == 1 then
+ hx = ray.x
+ hy = ray.y
+ disH = dist(player.x, player.y, hx, hy, ray.angle)
+ dof = 8
+ else
+ ray.x = ray.x + ray.xo
+ ray.y = ray.y + ray.yo
+ dof = dof + 1
+ end
+ end
+
+ dof = 0
+ local disV = 1000000
+ local vx = player.x
+ local vy = player.y
+ local nTan = -math.tan(ray.angle)
+
+ if (ray.angle > p2 and ray.angle < p3) then
+ ray.x = bit.lshift(bit.rshift(player.x, 6), 6) - 0.0001
+ ray.y = (player.x - ray.x) * nTan + player.y
+ ray.xo = -map.size
+ ray.yo = -ray.xo * nTan
+ end
+
+ if (ray.angle < p2 or ray.angle > p3) then
+ ray.x = bit.lshift(bit.rshift(player.x, 6), 6) + map.size
+ ray.y = (player.x - ray.x) * nTan + player.y
+ ray.xo = map.size
+ ray.yo = -ray.xo * nTan
+ end
+
+ if ray.angle == 0 or ray.angle == math.pi then
+ ray.x = player.x
+ ray.y = player.y
+ dof = 8
+ end
+
+ while dof < 8 do
+ ray.mx = bit.rshift(ray.x, 6)
+ ray.my = bit.rshift(ray.y, 6)
+ ray.mp = ray.my * map.x + ray.mx
+ if ray.mp > 0 and ray.mp < (map.x * map.y + 1) and map.map[ray.mp + 1] == 1 then
+ vx = ray.x
+ vy = ray.y
+ disV = dist(player.x, player.y, vx, vy, ray.angle)
+ dof = 8
+ else
+ ray.x = ray.x + ray.xo
+ ray.y = ray.y + ray.yo
+ dof = dof + 1
+ end
+ end
+
+ if disV < disH then
+ ray.x = vx
+ ray.y = vy
+ disT = disV
+ love.graphics.setColor(0.9, 0, 0)
+ end
+
+ if disH < disV then
+ ray.x = hx
+ ray.y = hy
+ disT = disH
+ love.graphics.setColor(0.7, 0, 0)
+ end
+
+ love.graphics.line(
+ player.x, player.y,
+ ray.x, ray.y
+ )
+
+ local ca = player.angle - ray.angle
+ if ca < 0 then
+ ca = ca + 2 * math.pi
+ end
+ if ca > 2 * math.pi then
+ ca = ca - 2 * math.pi
+ end
+ disT = disT * math.cos(ca)
+
+ local lineH = map.size * 320 / disT
+ if lineH > 320 then
+ lineH = 320
+ end
+ local lineO = 160 - lineH / 2
+ love.graphics.setLineWidth(8)
+ love.graphics.line(
+ r * 8 + 530, lineO,
+ r * 8 + 530, lineH + lineO
+ )
+
+ ray.angle = ray.angle + math.rad(1)
+ if ray.angle < 0 then
+ ray.angle = ray.angle + 2 * math.pi
+ end
+ if ray.angle > 2 * math.pi then
+ ray.angle = ray.angle - 2 * math.pi
+ end
+ end
+end