battlesystem: add mask system

sonic-radiance.love/scenes/battlesystem/controller/battlearena.lua

@@ -50,6 +50,8 @@ function BattleArena:loadRessources()
   self.textures.borders = love.graphics.newImage("assets/backgrounds/borders.png")
   self.textures.shadow  = love.graphics.newImage("assets/sprites/shadow.png")
 
+  self.emptytile        = love.graphics.newImage("assets/gui/tilemask.png")
+
   self.quads = {}
   self.quads.tiles = {}
   self.quads.sptiles = {}
@@ -207,4 +209,47 @@ function BattleArena:drawTile(x, y, type, variant)
   end
 end
 
+function BattleArena:showMask(ox, oy, shape, size, direction)
+  for i=1,12 do
+    for j=1,7 do
+      if self:isInMask(i, j, ox, oy, shape, size, direction) then
+        local x, y = self:gridToPixel(i, j)
+        love.graphics.draw(self.emptytile, x, y)
+      end
+    end
+  end
+end
+
+function BattleArena:isInMask(x, y, ox, oy, shape, size, direction)
+  local direction = direction or 1
+  local shape = shape or "point"
+  if shape == "point" then
+    return ((x == ox) and (y == oy))
+  elseif shape == "square" then
+    local x1 = ox - math.floor(size/2)
+    local x2 = ox + math.ceil(size/2)
+
+    local y1 = oy - math.floor(size/2)
+    local y2 = oy + math.ceil(size/2)
+    return ((x >= x1) and (x <= x2) and (y >= y1) and (y <= y2))
+  elseif shape == "circle" then
+    local lenght = utils.math.pointDistance(x, y, ox, oy)
+    return (lenght <= size)
+  elseif shape == "fullheight" then
+    local x2 = ox + (size*direction)
+    return ((x >= ox) and (x <= x2))
+  elseif shape == "fullwidth" then
+    local y2 = oy + (size*direction)
+    return ((y >= oy) and (y <= y2))
+  elseif shape == "line" then
+    local x2 = ox + (size*direction)
+    return ((y == oy) and (x >= ox) and (x <= x2))
+  elseif shape == "column" then
+    local y2 = oy + (size*direction)
+    return ((x == ox) and (y >= oy) and (y <= y2))
+  elseif shape == "everything" then
+    return true
+  end
+end
+
 return BattleArena