moonbus: particles

moonbus.p8

@@ -62,6 +62,8 @@ function load_level()
     plr_pos=find_random_point_by_flag(1)
     telem_spd={}
 
+    particles={}
+
     next_target()
 end
 
@@ -128,6 +130,7 @@ function _update()
     if plr_engine != -1 then
         sfx(2,2)
         plr_fuel=max(0,min(1,plr_fuel-fuel_cons))
+        generate_particle(plr_pos)
     else
         sfx(-1,2)
     end
@@ -157,6 +160,14 @@ function _update()
         plr_speed.y-=gravity
     end
 
+    -- particles
+    for i,part in pairs(particles) do
+        part.spd.y-=gravity/5
+        move(part.p,part.spd,0.1)
+        part.age=max(0,part.age)+1
+        if (part.age >= part.limit) then del(particles,part) end
+    end
+
     -- crash detection
     local pc=plus(plr_pos,{x=0.5,y=-0.5})
     local crashed=false
@@ -196,8 +207,10 @@ function _update()
         plr_speed.x*=0.5
         plr_alive=false
         if (dist(plr_speed) > 1) then
+            for i=1,10 do generate_particle() end
             sfx(0)
         else
+            for i=1,20 do generate_particle() end
             plr_speed.x=0
             plr_speed.y=0
             plr_static=true
@@ -258,6 +271,14 @@ function _draw()
         pset(px,py,8)
     end
 
+    for part in all(particles) do
+        local p=part.p
+        local px,py=to_scrn(p)
+        --pset(px,py,ttl > 10 and 8 or 5)
+        circ(px,py,cos(part.age/20)*0.6+1.5,part.age < 10 and 8 or (part.age < part.limit/2 and 5 or 1))
+    end
+    print(#particles, 32,50,11)
+
     -- target
     if plr_alive then
         local tg={x=plr_target.x,y=plr_target.y}
@@ -384,6 +405,15 @@ function next_target()
     plr_target={x=mp.x,y=maph-mp.y+1}
 end
 
+function generate_particle()
+    add(particles,{
+        p=plus(plus(plr_pos,{x=0.25,y=-0.85}),{x=rnd(),y=rnd()},0.5),
+        spd=plus(mul({x=rnd(2)-1,y=rnd(2)-1},0.1),mul(plr_speed,rnd(0.5))),
+        age=rnd(20),
+        limit=80+flr(rnd(40))
+    })
+end
+
 function to_scrn(p)
     local x=p.x*8
     local y=128-p.y*8
@@ -415,6 +445,7 @@ function cleary(p)
     }
 end
 function mul(p,a)
+    a=a or 1
     return {
         x=p.x*a,
         y=p.y*a
@@ -446,38 +477,38 @@ function limit(val,lim)
     return val
 end
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