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lua-test-202107100001

This commit is contained in:
Juhani Krekelä 2021-07-10 00:03:57 +03:00
parent 4c376f42d8
commit 90f2879e9a
1 changed files with 65 additions and 75 deletions
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140
lua-test/main.lua
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@ -1,26 +1,19 @@
local fov = 90 * math.pi / 180
local playerx = 10 local playerx = 10
local playery = 10 local playery = 10
local angle = 0 local angle = 1
local playerspeed = 0 local playerspeed = 0
local playerswspeed = 0 local playerswspeed = 0
local playermaxspeed = 100 local playermaxspeed = 100
function love.load() local sin = {0, 0.707, 1, 0.707, 0, -0.707, -1, -0.707}
love.mouse.setRelativeMode(true) local cos = {1, 0.707, 0, -0.707, -1, -0.707, 0, 0.707}
end
function love.mousemoved(x, y, dx, dy)
angle = angle - dx / love.graphics.getWidth() * 2 * math.pi
end
function love.update(dt) function love.update(dt)
playerx = playerx + math.sin(angle) * playerspeed * dt playerx = playerx + sin[angle] * playerspeed * dt
playerx = playerx + math.cos(angle) * playerswspeed * dt playerx = playerx + cos[angle] * playerswspeed * dt
playery = playery + math.cos(angle) * playerspeed * dt playery = playery + cos[angle] * playerspeed * dt
playery = playery - math.sin(angle) * playerswspeed * dt playery = playery - sin[angle] * playerswspeed * dt
end end
function love.keypressed(key) function love.keypressed(key)
@ -32,11 +25,13 @@ function love.keypressed(key)
playerswspeed = playerswspeed + playermaxspeed playerswspeed = playerswspeed + playermaxspeed
elseif key == 'd' then elseif key == 'd' then
playerswspeed = playerswspeed - playermaxspeed playerswspeed = playerswspeed - playermaxspeed
elseif key == 'o' then
fov = fov + 10 * math.pi / 180
elseif key == 'p' then
fov = fov - 10 * math.pi / 180
elseif key == 'q' then elseif key == 'q' then
angle = angle + 1
if angle > 8 then angle = 1 end
elseif key == 'e' then
angle = angle - 1
if angle < 1 then angle = 8 end
elseif key == 'escape' then
love.event.quit() love.event.quit()
end end
end end
@ -59,13 +54,13 @@ function transform(wx, wy)
local ty = wy - playery local ty = wy - playery
-- Player-relative space (rotation) -- Player-relative space (rotation)
local rx = math.cos(angle) * tx - math.sin(angle) * ty local rx = cos[angle] * tx - sin[angle] * ty
local ry = math.cos(angle) * ty + math.sin(angle) * tx local ry = cos[angle] * ty + sin[angle] * tx
-- -1.0 to +1.0 abstract screen space (perspective) -- -1.0 to +1.0 abstract screen space (perspective)
-- Player-relative x maps to *-x* -- Player-relative x maps to *-x*
-- Player-relative y maps to *z* -- Player-relative y maps to *z*
local px = -rx / ry / math.tan(fov / 2) local px = -rx / ry
-- Screen space (scaling and translation) -- Screen space (scaling and translation)
local hwidth = love.graphics.getWidth() / 2 local hwidth = love.graphics.getWidth() / 2
@ -82,88 +77,83 @@ function drawWall(wx1, wy1, wx2, wy2)
local x2, z2 = transform(wx2, wy2) local x2, z2 = transform(wx2, wy2)
if z1 < 0 and z2 < 0 then if z1 < 0 and z2 < 0 then
love.graphics.setColor(0.8, 0.7, 0.7)
love.graphics.line(wx1 + hwidth, wy1 + hheight, wx2 + hwidth, wy2 + hheight)
-- Fully outside of viewport, don't bother -- Fully outside of viewport, don't bother
return return
end end
love.graphics.setColor(1, 0, 0)
love.graphics.line(wx1 + hwidth, wy1 + hheight, wx2 + hwidth, wy2 + hheight)
if z1 < 0 or z2 < 0 then if z1 < 0 or z2 < 0 then
local clippingx = playerx + 0.001*math.sin(angle) local clippingx = playerx + 0.001*sin[angle]
local clippingy = playery + 0.001*math.cos(angle) local clippingy = playery + 0.001*cos[angle]
local x = nil local x = nil
local y = nil local y = nil
if wx2 ~= wx1 then if angle == 1 or angle == 5 then
local clippingslope = -math.sin(angle)/math.cos(angle) y = clippingy
local wallslope = (wy2 - wy1)/(wx2 - wx1) if wx1 == wx2 then x = wx1
x = (-clippingslope*clippingx + clippingy + wallslope*wx1 - wy1)/(wallslope - clippingslope) elseif (wx1 < wx2) == (wy1 < wy2) then x = wx1 - wy1 + y
y = wallslope*(x - wx1) + wy1 else x = wx1 + wy1 - y
else end
local perclippingslope = -math.cos(angle)/math.sin(angle) elseif angle == 3 or angle == 7 then
local perwallslope = (wx2 - wx1)/(wy2 - wy1) x = clippingx
y = (-perclippingslope*clippingy + clippingx + perwallslope*wy1 - wx1)/(perwallslope - perclippingslope) if wy1 == wy2 then y = wy1
x = perwallslope*(y - wy1) + wx1 elseif (wx1 < wx2) == (wy1 < wy2) then y = wy1 - wx1 + x
else y = wy1 + wx1 - x
end
elseif angle == 2 or angle == 6 then
if wy1 == wy2 then
x = clippingx + clippingy - wy1
y = wy1
elseif wx1 == wx2 then
x = wx1
y = clippingx + clippingy - wx1
else
x = (wx1 + clippingx + clippingy - wy1) / 2
y = (wy1 + clippingy + clippingx - wx1) / 2
end
elseif angle == 4 or angle == 8 then
if wy1 == wy2 then
x = clippingx - clippingy + wy1
y = wy1
elseif wx1 == wx2 then
x = wx1
y = clippingy - clippingx + wx1
else
x = (wx1 + clippingx - clippingy + wy1) / 2
y = (wy1 + clippingy - clippingx + wx1) / 2
end
end end
if z1 < 0 then if z1 < 0 then x1, z1 = transform(x, y)
x1, z1 = transform(x, y) else x2, z2 = transform(x, y)
love.graphics.setColor(0.8, 0.5, 0.5)
love.graphics.line(wx1 + hwidth, wy1 + hheight, x + hwidth, y + hheight)
else
x2, z2 = transform(x, y)
love.graphics.setColor(0.8, 0.5, 0.5)
love.graphics.line(x + hwidth, y + hheight, wx2 + hwidth, wy2 + hheight)
end end
end end
local wall1 = hwidth * 60 / z1 / math.tan(fov / 2) local wall1 = hwidth * 60 / z1
local wall2 = hwidth * 60 / z2 / math.tan(fov / 2) local wall2 = hwidth * 60 / z2
love.graphics.setColor(1, 1, 1) love.graphics.setColor(1, 1, 1)
love.graphics.line(x1, hheight - wall1, x2, hheight - wall2) love.graphics.line(x1, hheight - wall1, x2, hheight - wall2)
love.graphics.line(x1, hheight + wall1, x2, hheight + wall2) love.graphics.line(x1, hheight + wall1, x2, hheight + wall2)
love.graphics.line(x1, hheight - wall1, x1, hheight + wall1) love.graphics.line(x1, hheight - wall1, x1, hheight + wall1)
love.graphics.line(x2, hheight - wall2, x2, hheight + wall2) love.graphics.line(x2, hheight - wall2, x2, hheight + wall2)
if z1 < 0 then
love.graphics.setColor(0, 0, 1)
square = {
wx1 - 5 + hwidth, wy1 - 5 + hheight,
wx1 + 5 + hwidth, wy1 - 5 + hheight,
wx1 + 5 + hwidth, wy1 + 5 + hheight,
wx1 - 5 + hwidth, wy1 + 5 + hheight,
}
love.graphics.polygon('fill', square)
love.graphics.line(hwidth+playerx, hheight+playery, hwidth+wx1, hheight+wy1)
end
if z2 < 0 then
love.graphics.setColor(0, 0, 1)
square = {
wx2 - 5 + hwidth, wy2 - 5 + hheight,
wx2 + 5 + hwidth, wy2 - 5 + hheight,
wx2 + 5 + hwidth, wy2 + 5 + hheight,
wx2 - 5 + hwidth, wy2 + 5 + hheight,
}
love.graphics.polygon('fill', square)
love.graphics.line(hwidth+playerx, hheight+playery, hwidth+wx2, hheight+wy2)
end
end end
function love.draw() function love.draw()
local hwidth = love.graphics.getWidth() / 2 local hwidth = love.graphics.getWidth() / 2
local hheight = love.graphics.getHeight() / 2 local hheight = love.graphics.getHeight() / 2
drawWall(-300, -200, -200, 100) drawWall(-300, -200, -100, 0)
drawWall(-100, 0, -300, 200)
drawWall(-150, 200, 300, 200) drawWall(-150, 200, 300, 200)
drawWall(300, 200, 300, -200) drawWall(300, 200, 300, -200)
drawWall(300, -200, -300, -200) drawWall(300, -200, -300, -200)
love.graphics.setColor(0, 1, 0) love.graphics.setColor(1, 1, 1)
love.graphics.line(hwidth+playerx, hheight+playery, hwidth+playerx + math.sin(angle + fov/2) * 5, hheight+playery + math.cos(angle + fov/2) * 5) anglecw = angle - 1
love.graphics.line(hwidth+playerx, hheight+playery, hwidth+playerx + math.sin(angle - fov/2) * 5, hheight+playery + math.cos(angle - fov/2) * 5) if anglecw < 1 then anglecw = 8 end
anglecc = angle + 1
if anglecc > 8 then anglecc = 1 end
love.graphics.line(hwidth, hheight, hwidth + sin[anglecw] * 5, hheight + cos[anglecw] * 5)
love.graphics.line(hwidth, hheight, hwidth + sin[anglecc] * 5, hheight + cos[anglecc] * 5)
end end