Display sailable border.

cities.lua

@@ -11,25 +11,34 @@ local cities
 local points = {}
 local caps = {}
 
-t.selectedCity = nil
+t.selected = nil
+t.selectionLocked = false
+
+function t.lockSelection()
+  t.selectionLocked = true
+end
+
+function t.unlockSelection()
+  t.selectionLocked = false
+end
 
 function t.draw()
   if cities.visible then lg.points( points ) end
 end
 
 function t.drawSelected( r )
-  if not t.visible then return end
-  local c  = t.selectedCity
+  if not cities.visible then return end
+  local c  = t.selected
   if not c then return end
   lg.circle( "fill", c.x, c.y, r )
 end
 
 function t.drawCapitals()
-  if t.visible then lg.points( caps ) end
+  if cities.visible then lg.points( caps ) end
 end
 
 function t.selectNearestCity(x, y)
-  t.selectedCity = cities:getClosestPoint(x, y)
+  if not t.selectionLocked then t.selected = cities:getClosestPoint(x, y) end
 end
 
 function t.load( filename )

main.lua

@@ -50,14 +50,30 @@ function love.draw()
 
   --Edit box.
   love.graphics.rectangle( "line", love.graphics.getWidth() / 2, h, love.graphics.getWidth() / 2, 30 )
-  if map.cities.selectedCity then
-    local c = map.cities.selectedCity
+  if map.cities.selected then
+    local c = map.cities.selected
     love.graphics.setColor( 0.2, 0.1, 0.1, 0.5 )
     love.graphics.rectangle( "fill", 0, 0, 150 ,100 )    
     love.graphics.setColor( 1, 1, 1, 1 )
     love.graphics.rectangle( "line", 0, 0, 150 ,100 )   
     love.graphics.setColor( 1.2, 1.1, 1.1, 1.5 )
     love.graphics.print( ("NAME: %s\nX: %3.2f\nY: %3.2f\nPOP: %d\nCAPITAL: %s\nCOUNTRY: %s"):format(c.name, c.x, c.y, c.pop, tostring(c.capital), c.country), 0, 0 )
+  elseif map.travelnodes.selected then
+    local c = map.travelnodes.selected
+    love.graphics.setColor( 0.2, 0.1, 0.1, 0.5 )
+    love.graphics.rectangle( "fill", 0, 0, 150 ,100 )    
+    love.graphics.setColor( 1, 1, 1, 1 )
+    love.graphics.rectangle( "line", 0, 0, 150 ,100 )   
+    love.graphics.setColor( 1.2, 1.1, 1.1, 1.5 )
+    love.graphics.print( ("Node: %d\nX: %3.2f\nY: %3.2f\n"):format(c.number, c.x, c.y) )
+  elseif map.ainodes.selectedNode then
+    local c = map.ainodes.selected
+    love.graphics.setColor( 0.2, 0.1, 0.1, 0.5 )
+    love.graphics.rectangle( "fill", 0, 0, 150 ,100 )    
+    love.graphics.setColor( 1, 1, 1, 1 )
+    love.graphics.rectangle( "line", 0, 0, 150 ,100 )   
+    love.graphics.setColor( 1.2, 1.1, 1.1, 1.5 )
+    love.graphics.print( ("Node: %d\nX: %3.2f\nY: %3.2f\noffensive: %s"):format(c.number, c.x, c.y, c.attack) )
   end
 end
 

map.lua

@@ -49,6 +49,15 @@ function map.draw()
     end
     if map.sailable.visible then map.sailable:draw() end
     lg.setBlendMode( "alpha" )
+    
+    lg.setColor( 1, 1, 1, 1 )
+  end
+  
+  do --borders
+    lg.setColor( 1,1,1,1)
+    lg.setLineJoin( "none" )
+    lg.setLineWidth( 1 / Camera.zoom )
+    map.sailable:drawBorder()
   end
 
 
@@ -66,8 +75,8 @@ function map.draw()
       lg.setPointSize( 1.0 * Camera.zoom )
       map.cities.drawCapitals()
 
-      lg.setColor( 1, 0, 1, 0.5 )
-      map.cities.drawSelected( 22.0 / Camera.zoom )
+      lg.setColor( 1, 1, 1, 0.5 )
+      map.cities.drawSelected( 15.0 / Camera.zoom )
       
       map.ainodes:draw()
     end

nodes.lua

@@ -25,6 +25,17 @@ local function isConnected( startNode, endNode )
   return true
 end
 
+function t.getClosest( nodes, x, y )
+  local d = math.huge
+  local closestNode
+  for _, node in pairs( nodes.nodes ) do
+    local nx, ny = node.x, node.y
+    local nd = (nx - x) * (nx - x) + (ny - y) * (ny - y)
+    if nd < d then d = nd; closestNode = node end
+  end
+  return closestNode
+end
+
 function t.load( filename, sailable )
   
   isSailable = sailable

territory.lua

@@ -10,7 +10,7 @@ local colours = {
   southamerica = {1,0,1,0.5},
   southasia = {1,1,0,0.5},
   sailable = {1, 1, 1, 0.2},
-  }
+}
 
 function t.load( filename, name )
   local img, imgd = assert( bmp.load( filename ) )
@@ -18,15 +18,28 @@ function t.load( filename, name )
     visible = true, 
     name = name,
     colour = colours[name],
+    border = {},
     img = img,
     imgd = imgd
   }
 
-  if name == "sailable" then t.sailable = territory end
+  if name == "sailable" then
+    t.sailable = territory
+    t.computeBorder( territory, 20 / 255 )
+  end
   return setmetatable( territory, {__index = t } )
 end
 
 --World space coordinate.
+local function ToWorld( x, y )
+  return x * 360 / 512 - 180, y * 200 / 285 - 100
+end
+
+local function ToPixel( x, y )
+  return (x + 180) * 512 / 360, 285 - ( y + 100 ) * 285 / 200 
+end
+
+
 function t.isValid( x, y )
 
 end
@@ -59,11 +72,17 @@ function t.isSailable( x, y )
 end
 
 function t.canPlaceShip( territory, x, y )
-  
+  local water = assert( t.sailable )
+  if water:getPixel( x, y ) > 60 / 255
+  and territory:getPixel( x, y ) > 60 / 255 then return true end
+  return false
 end
 
 function t.canPlaceLand( territory, x, y )
-  
+  local water = assert( t.sailable )
+  if water:getPixel( x, y ) < 60 / 255
+  and territory:getPixel( x, y ) > 130 / 255 then return true end
+  return false
 end
 
 function t.draw( territory )
@@ -71,6 +90,53 @@ function t.draw( territory )
   lg.draw( territory.img )
 end
 
+function t.drawBorder( territory )
+  --lg.setColor( territory.colour )
+  for _, poly in ipairs( territory.border ) do
+    lg.line( poly )
+  end
+end
+
+
+function t.computeBorder( territory, threshold )
+  territory.border = {}
+  local border = territory.border
+  local n = 1
+
+  for x = 0, 511 do
+    for y = 0, 284 do
+      --Bottom left, bottom right, and top right of pixel in image coordinates:
+      local blx, bly = x, y + 1
+      local brx, bry = x + 1, y + 1
+      local trx, try = x + 1, y
+
+      --Sample image and detect edge:
+      local curValue = territory.imgd:getPixel( x, y )
+      local leftValue = territory.imgd:getPixel( math.min( x + 1, 511 ), y )
+      local downValue = territory.imgd:getPixel( x, math.min( 284, y + 1 ) )
+
+      local isLeftEdge =
+      ((curValue >= threshold) and (leftValue < threshold)) or
+      ((curValue <= threshold) and (leftValue > threshold))
+      local isDownEdge = 
+      ((curValue >= threshold) and (downValue < threshold)) or
+      ((curValue <= threshold) and (downValue > threshold))
+
+      if isLeftEdge then
+        --print( "Left edge:", brx, bry, trx, try )
+        border[n] = { brx, bry, trx, try }
+        n = n + 1
+      end
+
+      if isDownEdge then
+        --print( "Down edge:", blx, bly, brx, bry )
+        border[n] = { blx, bly, brx, bry }
+        n = n + 1
+      end
+    end
+  end
+end
+
 function t.drawConnections( nodes )
 
 end