scenes/map: add a basic cursor

imperium-porcorum.love/scenes/worldmap/init.lua

@@ -5,17 +5,74 @@ function WorldMap:new()
   WorldMap.super.new(self)
   self.assets:addImage("background", "assets/backgrounds/worldmap.png")
   self.banner = game.gui.newBanner("banner.png", "Choose your level")
+  self.cursor = {}
+  self.cursor.x,      self.cursor.y     = 0, 0
+  self.cursor.drawx,  self.cursor.drawy = 0, 0
+  self.cursor.canMove = true
 
   self:register()
 end
 
 function WorldMap:update(dt)
+  if (self.keys["up"].isDown) and (self.cursor.canMove) then
+    self.cursor.y       = math.max(0, self.cursor.y - 1)
+    self.cursor.canMove = false
+  end
 
+  if (self.keys["down"].isDown) and (self.cursor.canMove) then
+    self.cursor.y       = math.min(12, self.cursor.y + 1)
+    self.cursor.canMove = false
+  end
+
+  if (self.keys["right"].isDown) and (self.cursor.canMove) then
+    self.cursor.x       = math.min(27, self.cursor.x + 1)
+    self.cursor.canMove = false
+  end
+
+  if (self.keys["left"].isDown) and (self.cursor.canMove) then
+    self.cursor.x       = math.max(0, self.cursor.x - 1)
+    self.cursor.canMove = false
+  end
+
+  local dx = self.cursor.x - self.cursor.drawx
+  local dy = self.cursor.y - self.cursor.drawy
+  local dist = (dt*6)
+
+  if math.abs(dx) >= (dist) then
+    self.cursor.drawx = self.cursor.drawx + (dist * utils.math.sign(dx))
+  else
+    self.cursor.drawx = self.cursor.x
+  end
+
+  if math.abs(dy) >= (dist) then
+    self.cursor.drawy = self.cursor.drawy + (dist * utils.math.sign(dy))
+  else
+    self.cursor.drawy = self.cursor.y
+  end
+
+  if (self.cursor.drawy == self.cursor.y) and (self.cursor.drawx == self.cursor.x) then
+    self.cursor.canMove = true
+  end
+end
+
+function WorldMap:mousemoved(x, y)
+  if x >= 16 and y >= 48 then
+    local xx = math.floor((x - 16) / 16)
+    local yy = math.floor((y - 48) / 16)
+
+    xx = math.max(0, math.min(xx, 27))
+    yy = math.max(0, math.min(yy, 12))
+
+    self.cursor.x,      self.cursor.y     = xx, yy
+    self.cursor.drawx,  self.cursor.drawy = xx, yy
+  end
 end
 
 function WorldMap:draw()
   self.assets:drawImage("background", 0, 0)
   love.graphics.draw(self.banner, 0, 8)
+  local x, y = 16 + self.cursor.drawx * 16, 48 + self.cursor.drawy * 16
+  love.graphics.rectangle("fill", x, y, 16, 16)
 end
 
 return WorldMap