缩略地图如何做

驴获获

想请问一下地图特别大，看见有的游戏在左上角设置了一个缩略地图，并且有显示主角现在处在的位置，请问这样的功能用代码如何实现呢？新手对代码接触不多，能说的详细一点或者有没有教程链接之类的？谢谢啦

taroxd

https://rpg.blue/thread-224250-1-1.html

fyqinpku

[pre lang="ruby"]#encoding:utf-8
# 小地图，不显示事件，只显示玩家位置和地图
# 进入新地图时会生成小地图，地图越大读取时间越久。
# 缓存最近使用的地图，最多10张（可在下面更改）。优先保留常用的地图
# 进入地图按 F5 打开小地图
# 不支持循环的地图。


class Window_MiniMap < Window_Base
ZoomRate = 0.25 #放大率
Hide_Text = '<hide minimap>'#地图备注中加入这个，该地图不显示小地图
@@cache = {}
@@show = false

  def initialize(vp)
    super(Graphics.width - 205, 5, 200, 160) #设置窗口的 x, y, width, height
    self.viewport = vp
    self.visible = false
    self.z = 299
    contents.fill_rect(contents.rect, Color.new(0, 0, 0, 255))#底色
    create_minimap
    create_player_sprite
    refresh_visible
    update
  end
  def update
    super
    update_player_sprite
    update_minimap
    switch_minimap if Input.trigger?(:F5) #设置呼出按键
  end
  def switch_minimap
    @@show = !@@show
    refresh_visible
  end
  def update_minimap
    @minimap.src_rect.x = $game_player.real_x * 32 - @minimap_sw
    @minimap.src_rect.y = $game_player.real_y * 32 - @minimap_sh
  end
  def dispose
    dispose_player_sprite
    @minimap.visible = false
    super
  end



  def create_player_sprite
    @player_sprite = Sprite_MapCharacter.new(viewport, $game_player)
    @player_sprite.z = 301
    @player_sprite.x = x + padding + (@minimap_sw+16)*ZoomRate
    @player_sprite.y = y + padding + (@minimap_sh+28)*ZoomRate
    @player_sprite.color = Color.new(220, 0, 0)
    @player_sprite.zoom_x = @player_sprite.zoom_y = ZoomRate
  end
  def update_player_sprite
    @player_sprite.update
  end
  def dispose_player_sprite
    @player_sprite.dispose
  end


  def refresh_visible
    show = !@hide&& @@show
    self.visible = show
    @minimap.visible = show
    @player_sprite.visible = show
  end
  def create_minimap
    @minimap_sw = contents.width / 2 / ZoomRate
    @minimap_sh = contents.height / 2 / ZoomRate
    @minimap = Sprite.new
    @minimap.x = x + padding
    @minimap.y = y + padding
    @minimap.z = 300

    spriteset_map = nil
    SceneManager.scene.instance_eval {spriteset_map = @spriteset}

    @minimap.bitmap = minimap_bitmap(spriteset_map)
    @minimap.zoom_x = @minimap.zoom_y = ZoomRate
    @minimap.src_rect = Rect.new(0, 0, @minimap_sw*2, @minimap_sh*2)
    @minimap.viewport = viewport

  end

  def minimap_bitmap(spriteset_map)

    hide = false
    $game_map.instance_eval { hide = @map.note.include? Hide_Text }
    @hide= hide
    return nil if @hide

    v = @@cache[$game_map.map_id]
    bitmap = v ? v[1] : nil
    if bitmap && !bitmap.disposed?
      v[0] += 1
      return bitmap
    end

    spriteset_map.update
    spriteset_map.prepare_snap_minimap

    tempSprite = Sprite.new
    rect = contents.text_size( "LOADING" )
    rect.width += 4
    rect.height += 4
    rect.x = Graphics.width - rect.width
    rect.y = Graphics.height - rect.height
    tempSprite.bitmap = Bitmap.new Graphics.width, Graphics.height
    tempSprite.bitmap.fill_rect(tempSprite.bitmap.rect, Color.new(0,0,0) )
    tempSprite.bitmap.draw_text(rect, "LOADING")
    tempSprite.z = 1000

    mw = $game_map.width
    mh = $game_map.height


    bitmap = Bitmap.new( mw*32, mh*32 )
    sw = $game_map.screen_tile_x
    sh = $game_map.screen_tile_y
    (mw.fdiv sw).ceil.times {|x|
      (mh.fdiv sh).ceil.times {|y|
        tempSprite.visible = false

        $game_map.set_display_pos(sw * x, sh * y)
        spriteset_map.update_snap_minimap
        dx = $game_map.display_x * 32
        dy = $game_map.display_y * 32
        bp = Graphics.snap_to_bitmap
        bitmap.blt( dx, dy, bp, bp.rect )
        tempSprite.visible = true
        Graphics.update
      }
    }
    tempSprite.bitmap.dispose
    tempSprite.dispose

    $game_player.center($game_player.x, $game_player.y)
    spriteset_map.update

    if @@cache.size > 10 #设置缓存地图张数
      min_k = 0
      @@cache.each {|k, v| min_k = k if v[0] > min_k}
      @@cache.delete(min_k)[1].dispose
    end
    @@cache[$game_map.map_id] = [1, bitmap]
    return bitmap
  end
end


class Spriteset_Map
  attr_reader :viewport1
  def prepare_snap_minimap
    @character_sprites.each {|s| s.visible = false}
    @viewport1.tone.set(0, 0, 0, 0)
    @viewport2.color.set(0, 0, 0, 0)
    @viewport3.color.set(0, 0, 0, 0)
  end
  #
  def update_snap_minimap
    update_tileset
    update_tilemap
    update_parallax
#~     update_shadow
#~     update_weather
#~     update_pictures
#~     update_timer
#~     update_viewports
  end
end

class Sprite_MapCharacter < Sprite_Character
  def update_other
  end
  def update_position
  end
  def setup_new_effect
  end
  def end_animation
  end
  def start_balloon
  end
  def dispose_balloon
  end
  def update_balloon
  end
  def end_balloon
  end
end

class Scene_Map
  alias_method :sminimap_perform_transition, :create_spriteset
  def create_spriteset#perform_transition
    sminimap_perform_transition
    create_mini_map
  end
  alias_method :minimap_terminate, :terminate
  def terminate
    minimap_terminate
    @minimap.dispose
  end
  alias_method :sminimap_post_transfer, :post_transfer
  def post_transfer
    create_mini_map
    sminimap_post_transfer
  end
  def create_mini_map
    t = Graphics.brightness
    Graphics.brightness = 255
    c = @viewport.color
    @viewport.color = Color.new

    if @map_name_window && !@map_name_window.disposed?
      v = @map_name_window.visible
      @map_name_window.visible = false
    end


    @minimap.dispose if @minimap
    @minimap = Window_MiniMap.new(@spriteset.viewport1)

    Graphics.brightness = t
    @viewport.color = c
    if @map_name_window && !@map_name_window.disposed?
      @map_name_window.visible = v
    end
  end
end
[/pre]

引自：
https://rpg.blue/thread-333550-1-1.html

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