init, changed a few things for GEIGERnet-Server, added sounds for receiving RDS message

hud.lua

@@ -0,0 +1,128 @@
+
+function ham_radio.toggle_hud(player)
+  local name = player:get_player_name()
+  local item = player:get_wielded_item()
+  
+  -- remove hud and RDS if user does not wield a receiver
+  if item:get_name() ~= "ham_radio:handheld_receiver" then
+    if ham_radio.is_receiver_wielded[name] then
+      for hud_id, hud_handler in pairs(ham_radio.playerhuds[name]) do
+        player:hud_remove(hud_handler)
+      end
+      ham_radio.playerhuds[name] = nil
+      ham_radio.is_receiver_wielded[name] = false
+      ham_radio.player_rds[name] = nil
+    end
+    return false
+  end
+
+  -- if hud is already enabled, pass
+  if ham_radio.is_receiver_wielded[name] then
+	  return true
+  end
+
+  -- create hud
+  ham_radio.is_receiver_wielded[name] = true
+
+  local hud_pos = ham_radio.settings.hud_pos
+  local hud_color = ham_radio.settings.hud_color
+  
+  ham_radio.playerhuds[name] = {
+    background = player:hud_add({
+      hud_elem_type = "image",
+      position  = hud_pos,
+      offset    = { x = -250, y = 20 },
+      text      = "ham_radio_hud_bg.png",
+      scale     = { x = 2, y = 2 },
+      alignment = { x = 1, y = 0 },
+    }),
+    frequency = player:hud_add({
+      hud_elem_type = "text",
+      text = "",
+      position  = hud_pos,
+      offset    = { x = -220, y = 5 },
+      alignment = { x = 1, y = 0},
+      number = hud_color.inactive,
+      scale= { x = 100, y = 20 },
+    }),
+    rds = player:hud_add({
+      hud_elem_type = "text",
+      text = "",
+      position  = hud_pos,
+      offset    = { x = 220, y = 5 },
+      alignment = { x = -1, y = 0},
+      number = hud_color.inactive,
+      scale= { x = 100, y = 20 },
+    }),
+	  signal_meter = player:hud_add({
+      hud_elem_type = "image",
+      position  = hud_pos,
+      offset    = { x = -220, y = 35 },
+      text      = "ham_radio_hud_indicator_empty.png",
+      scale     = { x = 2, y = 1 },
+      alignment = { x = 1, y = 0 },
+    }),
+	  signal_level = player:hud_add({
+	    hud_elem_type = "image",
+      position  = hud_pos,
+      offset    = { x = -220, y = 35 },
+      text      = "ham_radio_hud_indicator_full.png",
+      scale     = { x = 0, y = 1 },
+      alignment = { x = 1, y = 0 },
+    })
+  }
+  return true
+end
+
+
+function ham_radio:update_hud_display(player)
+
+  if not ham_radio.toggle_hud(player) then
+    return
+  end
+
+  local signal_power = 0
+  local name = player:get_player_name()
+  local meta = player:get_wielded_item():get_meta()
+  local frequency = meta:get_string("frequency")
+
+  if frequency ~= nil and frequency ~= "" then
+    local transmitters = self.find_transmitters(frequency)
+    for position, transmitter in pairs(transmitters) do
+      local transmitter_signal = self:locate_transmitter(player, minetest.string_to_pos(position))
+      if transmitter_signal > signal_power then
+        -- use max power from transmitters nearby
+        signal_power = transmitter_signal
+      end
+    end
+  end
+
+  local hud_color = ham_radio.settings.hud_color
+
+  -- update frequency hud
+  local frequency_text = "FQ ---"
+  local frequency_color = hud_color.inactive
+  if frequency ~= "" then
+    frequency_text = "FQ "..frequency
+    frequency_color = hud_color.active
+  end
+  player:hud_change(self.playerhuds[name].frequency, "text", frequency_text)
+  player:hud_change(self.playerhuds[name].frequency, "number", frequency_color)
+
+  -- update RDS hud
+  local rds_text = "RDS off"
+  local rds_color = hud_color.inactive
+  if meta:get_string("rds_disabled") == "" then
+    rds_text = "RDS ON"
+    rds_color = hud_color.active
+  end
+  player:hud_change(self.playerhuds[name].rds, "text", rds_text)
+  player:hud_change(self.playerhuds[name].rds, "number", rds_color)
+  
+  -- update signal level hud
+  player:hud_change(
+    self.playerhuds[name].signal_level,
+    "scale",
+    { x = signal_power/50 or 0.1, y = 1 } -- x scale should be 0-2
+  )
+end