制作一款打飞机游戏教程2：背景滚动

滚动原型开发

接下来，我们开始聚焦滚动原型的开发。我们需要确定游戏关卡的长度以及背景滚动的速度。

地图与精灵空间限制

在开发过程中，我们遇到了地图与精灵空间限制的问题。PICO 8的地图编辑器下半部分与精灵表共享空间，这意味着我们只能使用地图的一半空间。这大大限制了我们可以创建的关卡长度。

滚动机制实现

为了实现背景滚动，我们将地图分割成多个段落，并将它们堆叠在一起。通过调整每个段落的垂直位置，我们实现了背景的连续滚动效果。

性能测试与滚动速度调整

在滚动原型中，我们进行了多次测试，以确定最佳的滚动速度。我们发现，以当前的速度，整个关卡大约可以在60秒内完成，这可能对于一款射击游戏来说有些过短。

讨论与后续计划

关卡长度问题

我们讨论了关卡长度的问题，并决定需要进行更多的研究。我们需要找到射击游戏中关卡长度的最佳实践，并思考如何在我们有限的地图空间内延长关卡时间。

后续任务

接下来的任务包括：

• 研究射击游戏中关卡长度的标准。
• 探索延长关卡时间的可能方法，如增加障碍物、敌人种类等。
• 继续优化滚动原型，确保背景滚动的流畅性和视觉效果。

pico-8 cartridge // http://www.pico-8.com
version 41
__lua__
-- scrolling prototype
-- - how long is a level?
-- - what is a good speed?
-- - (tileset?)

-- map
-- 128 tiles
-- 32 tiles

-- screen
-- 16 x 16 tiles

-- 8 screens
-- 2 screens

-- 16 screens (15 screens)

-- speed 0.5
-- around 60 seconds

-- speed 0.2
-- around 160 seconds

-- goal: 6 minutes (360s)
--       4 minutes (240s)


function _init()
 scroll=0
 
 seglib={}
 
 for i=1,32 do
  local col=flr((i-1)/4)*16
  local row=(i-1)%4*8
  add(seglib,{
   mx=col,
   my=row
  })
 end
 
 mapsegs={32,2,1,8,32,2,1,8,32,2,1,8,32,2,1,8,32,2,1,8,32,2,1,8,32,2,1,8,32,2,1,8,32,2,1,8,32,2,1,8,32,2,1,8}

end

function _draw()
 cls(2)
 for i=1,#mapsegs do
  local myseg=seglib[mapsegs[i]]
  local segx=scroll-(i-1)*64
  map(myseg.mx,myseg.my,0,segx,16,8)
 end
 print(flr(time()),5,5,7)
 print(scroll,5,11,7)

end

function _update60()
 scroll+=0.2
 
 
end
__gfx__
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