Pico-8 tline rotated map demo

tline-rotatation-demo.p8

pico-8 cartridge // http://www.pico-8.com
version 19
__lua__
-- basic tline demo by @powersaurus

-- player rotation
a=270/360
-- player screen pos
px=64
py=64
-- toggle map/map-rotated-with-tline
rotated=true

function _update()
 if btn(⬅️) then
  a-=3/360
 elseif btn(➡️) then
  a+=3/360
 end
 if btnp(❎) then
  rotated=not rotated
 end
 
 if(a<0)a+=1.0
 if(a>=1.0)a-=1.0
end

function _draw()
 cls(6)
 
 if rotated then
  draw_rotated()
 else
  draw_map_view()
 end
 
 print("⬅️ ➡️ rotate view",2,112,7)
 print("❎ toggle rotated view",2,120,7)
end

function draw_rotated()
 -- player direction
 local stx=sin(a)
 local sty=cos(a)
 
 -- perpendicular to player dir
 -- used to define the start of 
 -- each line in map space
 local msx=sin(a+90/360)
 local msy=cos(a+90/360)
  
 -- map delta x and y values
 local mdx=stx/8
 local mdy=sty/8
 
 -- map position
 local mx=5
 local my=5
 
 -- how long the 
 -- textured line is
 local xl=40
 
 -- render a square of the map
 -- from players pov
 for y=-16,15 do

  tline(
   -- horizontal line on screen
   px,py+y,px+xl,py+y,
   -- map space line start
   mx+y*msx/8,my+y*msy/8,
   -- map deltas for line
   mdx,mdy)

 end
 
 -- point in direction of players view
 line(px,py,px+8,py,7)
end

function draw_map_view()

 map(0,0,24,24,10,10)


 draw_player()
end

function draw_player()
 local stx=sin(a)
 local sty=cos(a)
 
 local psx=sin(a+90/360)
 local psy=cos(a+90/360)
 
 -- player location
 circfill(px,py,1,7)
 -- player view direction
 line(px,py,px+stx*8,py+sty*8,7)
end
__gfx__
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__map__
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