drop xp gems

vacuum_gambit.p8

@@ -389,6 +389,7 @@ end
 
 function vertmeter(x0,y0,x1,y1,val,maxval,cols)
  if ((val <= 0) or (maxval <= 0)) return
+ val=min(val, maxval)
  local h = y1-y0
  local px = val/maxval * h \ 1
  local ncols = #cols
@@ -445,7 +446,26 @@ ship_m = mknew{
 
 function ship_m:die()
  self.dead = true
- if (self.hp < 0) boom(self.x+self.size*4, self.y+self.size*4,12*self.size, self.boss)
+ if (self.hp >= 0) return
+
+ -- blow up and drop xp
+ local sz4 = self.size * 4
+ local cx, cy, xp, z = self.x + sz4, self.y + sz4, self.xp or 0, 0
+ boom(cx, cy, 3*sz4, self.boss)
+ if xp > 499 then
+  -- spawn a huge gem with all
+  -- overage XP, min 100
+  spawn_xp_at(cx, cy, 0, xp-399)
+  xp = 399
+  z += 1
+ end
+ for gsz in all{100, 25, 5, 1} do
+  while xp >= gsz do
+   spawn_xp_at(cx, cy, z, gsz)
+   xp -= gsz
+   z += 1
+  end
+ end
 end
 
 function ship_m:calc_velocity(v0, t)
@@ -628,7 +648,7 @@ function bullet_base:move()
  self.x += self.dx
  self.y += self.dy
  if (self.f) self.f -= 1
- if (self.y > 128) or (self.y < -8 * self.height) or (self.f and self.f < 0) then
+ if (self.y > 145) or (self.y < -8 * self.height) or (self.f and self.f < 0) then
   self:die()
   return true
  end
@@ -897,9 +917,9 @@ player = mknew(ship_m.new{
  shield = 2, -- regenerates
  maxshield = 2,
 
- -- xp, increments of 0x0.01
+ -- xp; watch out for 16-bit range limits
  xp = 0,
- xptarget = 0x0.05,
+ xptarget = 4,
  level = 1,
 
  -- gun
@@ -956,8 +976,8 @@ frownie = mknew(ship_m.new{
  sparks = smokespark,
  sparkodds = 8,
  
- -- health
  hp = 0.5, -- enemy ships need no max hp
+ xp = 1,
 
  -- position
  x=60, -- x and y are for upper left corner
@@ -979,6 +999,7 @@ frownie = mknew(ship_m.new{
 blocky = mknew(frownie.new{
  sprite = 10,
  hp = 1.5,
+ xp = 2,
  hurt = {
   x_off = 0,
   y_off = 0,
@@ -998,6 +1019,7 @@ blocky = mknew(frownie.new{
 
 spewy = mknew(frownie.new{
  sprite=26,
+ xp = 3,
  hurt = {
   x_off=0,
   y_off=1,
@@ -1018,6 +1040,7 @@ spewy = mknew(frownie.new{
 
 chasey = mknew(ship_m.new{
  sprite = 5,
+ xp = 4,
  size = 1,
  hurt = {
   x_off = 1,
@@ -1052,6 +1075,7 @@ end
 
 xl_chasey=mknew(chasey.new{
  size=2,
+ xp = 10,
  maxspd=1.25,
  hurt = {
   x_off = 2,
@@ -1499,6 +1523,61 @@ end
 -->8
 -- powerups
 
+xp_gem = mknew(bullet_base.new{
+ dx = 0,
+ dy = 0.75,
+ width=1, -- not used for spr but
+ height=1,-- bullet_base uses it
+ category = enemy_blt_cat,
+ damage = 0,
+ hurt = {
+  x_off = -2,
+  y_off = -2,
+  width = 8,
+  height = 8,
+ },
+ x_off = 2,
+ y_off = 2,
+})
+
+function xp_gem:draw()
+ local s,qx,qy = self.qsprite,0,0
+ -- sprite map position:
+ -- sprite id to x and y,
+ -- offset shifts specific low
+ -- bits of lframe up to the the
+ -- bit with value 4 as a cheap
+ -- way to pick an anim frame
+ if (lframe&0x0.003 == 0) qx, qy = (lframe&0x0.0004)<<16, (lframe&0x0.0008)<<15
+ sspr(
+  (s%16<<3)+qx,
+  (s\16<<3)+qy,
+  4, 4,
+  self.x, self.y
+ )
+end
+
+-- todo: "magnetic" behavior
+-- when near player ship
+
+function xp_gem:hitship(ship)
+ if (ship ~= primary_ship) return false
+ primary_ship.xp += self.val
+ primary_ship.last_xp_frame = lframe
+ return true
+end
+
+-- small gems for 1, 5, 25
+-- exactly; else huge
+function spawn_xp_at(x, y, off, amt)
+ x += rnd(off+off)-off
+ y += rnd(off+off)-off
+ xp_gem.new{
+  qsprite=amt == 1 and 32 or amt == 5 and 33 or amt == 25 and 34 or 35,
+  val = amt,
+ }:spawn_at(mid(x, 0, 124),mid(y,-4,125))
+end
+
 powerup = mknew(bullet_base.new{
  -- animated sprite array: "sprites"
  -- to draw under or over anim,
@@ -1514,7 +1593,7 @@ powerup = mknew(bullet_base.new{
  -- but powerups should feel
  -- easy to pick up
  dx = 0,
- dy = 1.5, -- 0.75 after enemyspd
+ dy = 0.75,
  category = enemy_blt_cat, -- collides with player ship
  damage = 0,
  
@@ -1525,11 +1604,6 @@ powerup = mknew(bullet_base.new{
 -- sprite indexes for "sheen" animation
 sheen8x8 = split"2,54,55,56,57,58,59,60,61"
 
--- todo: draw two sprites
--- on top of each other here
--- so all powerups can share
--- the "sheen" animation?
-
 function powerup:draw()
  spr(self.sprites[max(1,
        ((lframe<<16)\self.anim_speed)
@@ -1636,6 +1710,7 @@ function spawn_spec_gun_at(x, y, gunt)
  }
  gun_p:spawn_at(x, y)
 end
+
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