space-shooter.p8

pico-8 cartridge // http://www.pico-8.com
version 29
__lua__
--space shooter
--fairedesjeux.fr

--reutilisez librement ce code!

function _init()
 p={
  x=60,y=80,
  w=8,h=7,
  speed=1.5,
  life=3,
  invicible=false,
  inv_timer=0
 }
 bullets={}
 enemy_bullets={}
 enemies={}
 explosions={}
 create_stars()
 score=0
 state=0
 text_timer=0 --pour onglet 6
end

function _update60()
	if (state==0) update_game()
	if (state==1) update_gameover()
end

function _draw()
	if (state==0) draw_game()
	if (state==1) draw_gameover()
end

function update_game()
 update_player()    --onglet 7
 update_bullets()   --onglet 1
 update_stars()     --onglet 2
 update_enemies()   --onglet 3
 update_explosions()--onglet 5
 
 if #enemies==0 then
 	spawn_enemies(ceil(rnd(7)))
 end
end

function draw_game()
 cls()
 --etoiles
 for s in all(stars) do
 	pset(s.x,s.y,s.col)
 end
 --ennemis
 for e in all(enemies) do
 	spr(3,e.x,e.y)
 end
 --vaisseau
 draw_player() --onglet 7
 --balles
 for b in all(bullets) do
 	spr(2,b.x,b.y)
 end
 for b in all(enemy_bullets) do
 	spr(5,b.x,b.y)
 end
 --explosions
 draw_explosions()
 --score
 print(score,2,2,10)
 --life
 for i=1,p.life do
 	spr(4, (i-1)*8, 8)
 end
end
-->8
--player & enemy bullets

function shoot()
 local new_bullet={
  x=p.x+2, y=p.y,
  w=4, h=5,
  speed=4
 }
 add(bullets, new_bullet)
 sfx(0)
end

function enemy_shoot(enemy)
 local angle=angle_to(enemy.x,enemy.y,p.x,p.y)
 --angle_to dans onglet 4
 local new_bullet={
  x=enemy.x+2, y=enemy.y+5,
  w=4, h=5,
  speed=1,
  dx=cos(angle),
  dy=-sin(angle)
 }
 add(enemy_bullets, new_bullet)
end

function update_bullets()
	for b in all(bullets) do
		b.y-=b.speed
		if (b.y<-8) del(bullets,b)
	end
	for b in all(enemy_bullets) do
		b.x+=b.dx*b.speed
		b.y+=b.dy*b.speed
		if (b.y>128) del(enemy_bullets,b)
	end
end
-->8
--stars

function create_stars()
	stars={}
	for i=1,20 do
		local new_star={
		 x=rnd(128),
		 y=rnd(128),
		 col=1,
		 speed=1+rnd(0.5)
	 }
	 add(stars, new_star)
	end
	for i=1,8 do
		local new_star={
		 x=rnd(128),
		 y=rnd(128),
		 col=6,
		 speed=3+rnd(1)
	 }
	 add(stars, new_star)
	end
end

function update_stars()
	for s in all(stars) do
		s.y+=s.speed
		if s.y>128 then
			s.y=0
			s.x=rnd(128)
		end
	end
end
-->8
--enemies

function spawn_enemies(amount)
	gap=(128-8*amount)/(amount+1)
	for i=1,amount do
		add(enemies,{
		 x=gap*i + 8*(i-1),
		 y=-24,
		 w=8,
		 h=8,
		 life=4,
		 shoot_timer=0
		})
	end
end

function update_enemies()
 for enemy in all(enemies) do
  enemy.y += 0.5
  if enemy.y > 130 then
   del(enemies,enemy)
  end
  --collision
  for b in all(bullets) do
  	if collision(enemy,b) then
  		create_explosion(b.x+1.5,b.y+3)
  		del(bullets,b)
  		enemy.life-=1
  		if enemy.life==0 then
  			del(enemies,enemy)
  			score+=100
				end
			end
  end
  --shoot toutes les 2 secondes
  --si l'ennemi n'est pas trop
  --en bas de l'ecran
  enemy.shoot_timer+=1
  if enemy.shoot_timer==120
  and enemy.y < 100 then
  	enemy_shoot(enemy)
  	enemy.shoot_timer=0
  end
 end
end
-->8
--tools

function collision(a,b)
 --w:width (largeur)
 --h:height (hauteur)
	return not (a.x > b.x+b.w-1
	            or a.y > b.y+b.h-1
	            or a.x+a.w-1 < b.x
	            or a.y+a.h-1 < b.y)
end

function angle_to(x1,y1,x2,y2)
 --angle pour aller du point 1
 --au point 2
 return atan2(y2-y1,x2-x1)+0.25
 --voir atan2 dans le manuel
end
-->8
--explosions

function create_explosion(x,y)
	add(explosions,{
	 x = x,
	 y = y,
	 timer = 0
	})
	sfx(1)
end

function update_explosions()
	for boom in all(explosions) do
		boom.timer += 1
		if boom.timer == 13 then
			del(explosions, boom)
		end
	end
end

function draw_explosions()
	for boom in all(explosions) do
		circ(boom.x, boom.y,
		 boom.timer/3, 8+boom.timer%3)
	end
end
-->8
--game over

function update_gameover()
 text_timer+=1
	if (btn(🅾️)) _init()
end

function draw_gameover()
	cls(2)
	rectfill(31,53,105,79,0)
	rectfill(28,50,102,76,1)
	local col=9
	if text_timer%8>4 then
	 col=10
	end
	print("score:"..score,38,56,col)
	print("🅾️/c:reessayer",38,66,10)
end
-->8
--player

function update_player()
 if (btn(➡️)) p.x+=p.speed
 if (btn(⬅️)) p.x-=p.speed
 if (btn(⬇️)) p.y+=p.speed
 if (btn(⬆️)) p.y-=p.speed
 if (btnp(❎)) shoot()
 
 --collision joueur-ennemis
 for e in all(enemies) do
 	if collision(e,p) then
 		if not p.invincible then
			 p.life-=1
		  p.invincible=true
		 end
		end
 end
 --collision joueur-balles
 for b in all(enemy_bullets) do
 	if collision(b,p) then
 	 if not p.invincible then
			 p.life-=1
		  p.invincible=true
		  create_explosion(b.x+1.5,b.y+4)
 	 	del(enemy_bullets,b)
		 end
		end
 end
 
 if p.invincible then
 	p.inv_timer+=1
 	--on desactive apres 90 frames
 	if p.inv_timer>90 then
 		p.inv_timer=0
 		p.invincible=false
		end
 end
 
 --game over
 if (p.life<=0) state=1
end

function draw_player()
	--permet de faire clignoter
	--le vaisseau si le timer
	--d'invincibilite est en cours
	if p.inv_timer%4<2 then
	 spr(1,p.x,p.y)
	end
end
__gfx__
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__sfx__
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