两点之间的距离问题

非常白菜

RUBY 代码复制

x,y = 111,333
  back = RPG::Sprite.new
  back.bitmap = Bitmap.new(640,480)
  back.bitmap.fill_rect(0,0,640,480,Color.new(0,0,0))
  a = RPG::Sprite.new
  b = RPG::Sprite.new
  c = RPG::Sprite.new
  aaa = Bitmap.new(10,10)
  aaa.fill_rect(0,0,10,10,Color.new(255,0,255)) 
  bbb = Bitmap.new(10,10)
  bbb.fill_rect(0,0,10,10,Color.new(0,255,255)) 
  a.bitmap = aaa
  b.bitmap = bbb
  a.x = 320
  a.y = 240
  b.x = x
  b.y = y
  c.x = 320
  c.y = 240
  m = Math.sqrt((x - 320)**2 + (y - 240)**2)
  c.bitmap = Bitmap.new(m,1)
  c.bitmap.fill_rect(0,0,m,1,Color.new(255,255,255)) 
  d = Math.atan2( (240 - y), (x - 320)) / Math::PI * 180
  c.angle = d

x,y = 111,333


  back = RPG::Sprite.new


  back.bitmap = Bitmap.new(640,480)


  back.bitmap.fill_rect(0,0,640,480,Color.new(0,0,0))


  a = RPG::Sprite.new


  b = RPG::Sprite.new


  c = RPG::Sprite.new


  aaa = Bitmap.new(10,10)


  aaa.fill_rect(0,0,10,10,Color.new(255,0,255)) 


  bbb = Bitmap.new(10,10)


  bbb.fill_rect(0,0,10,10,Color.new(0,255,255)) 


  a.bitmap = aaa


  b.bitmap = bbb


  a.x = 320


  a.y = 240


  b.x = x


  b.y = y


  c.x = 320


  c.y = 240


  m = Math.sqrt((x - 320)**2 + (y - 240)**2)


  c.bitmap = Bitmap.new(m,1)


  c.bitmap.fill_rect(0,0,m,1,Color.new(255,255,255)) 


  d = Math.atan2( (240 - y), (x - 320)) / Math::PI * 180


  c.angle = d