modules/world: add a basic view dimension system

gamecore/modules/world/camera.lua

@@ -46,7 +46,8 @@ function CameraSystem:initViews()
   self.views = {}
 
   self.views.list   = {}
-  self.views.width, self.views.height   = core.screen:getDimensions()
+  self.views.basewidth, self.views.baseheight   = core.screen:getDimensions()
+  self.views.width,     self.views.height       = self:getViewsDimensions()
 end
 
 -- INFO FUNCTIONS
@@ -60,6 +61,23 @@ function CameraSystem:haveView()
   return (self:getViewNumber() == 0)
 end
 
+function CameraSystem:getViewsDimensions()
+  local basewidth, baseheight = self.views.basewidth, self.views.baseheight
+  local viewnumber = self:getViewNumber()
+
+  if (viewnumber <= 1) then
+    return basewidth,       baseheight
+  elseif (viewnumber == 2) then
+    if (self.verticalSplit) then
+      return (basewidth/2), (baseheight)
+    else
+      return (basewidth),   (baseheight/2)
+    end
+  else
+    return (basewidth/2),   (baseheight/2)
+  end
+end
+
 -- WRAPPER and UTILS
 -- Access data from the views
 
@@ -72,6 +90,7 @@ function CameraSystem:addView(x, y)
     -- to target a specific object
 
     table.insert(self.views.list, view)
+    self.views.width, self.views.height = self:getViewsDimensions()
   end
 end