lib/character/behaviors/shadowcaster.lua

@@ -16,32 +16,34 @@ local function makeGradientMesh(w, h, topColor, bottomColor)
     return mesh
 end
 
-local function getFakeShadow(r)
+--- @param phi number угол, под которым падает свет
+--- @return boolean, number: рисуем ли тень * её прозрачность
+local function getFakeShadow(phi)
     local pi = math.pi
 
-    if r <= pi / 4 then
+    if phi <= pi / 4 then
         -- 1
         return false, 1
     end
-    if r <= pi / 2 then
+    if phi <= pi / 2 then
         -- 2
-        return true, 1 - (r - pi / 4) / (pi / 4)
+        return true, 1 - (phi - pi / 4) / (pi / 4)
     end
-    if r <= 3 * pi / 4 then
+    if phi <= 3 * pi / 4 then
         -- 3
-        return true, (r - pi / 2) / (pi / 4)
+        return true, (phi - pi / 2) / (pi / 4)
     end
-    if r <= 5 * pi / 4 then
+    if phi <= 5 * pi / 4 then
         -- 4
         return false, 1
     end
-    if r <= 3 * pi / 2 then
+    if phi <= 3 * pi / 2 then
         -- 5
-        return true, 1 - (r - 5 * pi / 4) / (pi / 4)
+        return true, 1 - (phi - 5 * pi / 4) / (pi / 4)
     end
-    if r <= 7 * pi / 4 then
+    if phi <= 7 * pi / 4 then
         -- 6
-        return true, (r - 3 * pi / 2) / (pi / 4)
+        return true, (phi - 3 * pi / 2) / (pi / 4)
     end
     -- 1
     return false, 1
@@ -67,10 +69,10 @@ function behavior:draw()
         return
     end
 
-    local r = love.timer.getTime() % (2 * math.pi)
+    local phi = love.timer.getTime() % (2 * math.pi)
 
-    local drawFakeShadow, opacity = getFakeShadow(r)
-    local nangle = (math.pi + r) % (2 * math.pi)
+    local drawFakeShadow, opacity = getFakeShadow(phi)
+    local nangle = (math.pi + phi) % (2 * math.pi)
     love.graphics.rotate(nangle)
 
     love.graphics.setColor(0, 0, 0, math.min(opacity * opacity, 0.5))