Multiple depth charges.

samples/ships.bas

@@ -1,36 +1,44 @@
-10 gosub 50000
+10 gosub 50000:goto 100
 
-20 hgr
-30 hcolor=6:hplot 0,13 to 279,13
+20 for i=1 to mm:if dx(i) then next i:return
+30 dx(i)=x:dy(i)=15:ds(i)=dc:return
 
-100 hcolor=3:x=140:sd=0:s=sh
-110 dx=0:dy=0
+100 hgr:vtab 21
+110 hcolor=6:hplot 0,13 to 279,13
+
+120 hcolor=3
+130 x=140:sd=0:s=sh
+140 di=0:mm=3:dim dx(mm),dy(mm),ds(mm),ox(mm),oy(mm),os(mm)
+150 for i=1 to mm:dx(i)=0:dy(i)=0:ds(i)=0:next i
 
 200 xdraw s at x,10:ox=x:os=s
-210 ky=peek(-16384):if ky > 127 then 300
-220 x=x+sd
-225 gosub 400
-230 if x < 10 then x=10
-240 if x > 270 then x=270
-250 xdraw os at ox,10
-260 goto 200
+210 for i=1 to mm
+220 ox(i)=dx(i):oy(i)=dy(i):os(i)=ds(i)
+230 if dx(i) then xdraw ds(i) at dx(i),dy(i)
+240 next i
 
-300 poke -16368,0
-310 if ky=136 then s=sh:sd=sd-1:goto 399
-320 if ky=149 then s=sh+1:sd=sd+1:goto 390
-330 if ky=160 and not dx and not dy then dx=x:dy=15:ds=dc:xdraw ds at dx,dy:goto 390 
-390 if abs(sd) > 3 then sd = sgn(sd)*3
-399 xdraw os at ox,10:goto 200
+300 ky=peek(-16384):if ky < 128 then 400
+310 poke -16368,0
+320 if ky=136 then s=sh:sd=sd-1
+330 if ky=149 then s=sh+1:sd=sd+1
+340 if sd > 3 then sd=3
+350 if sd < -3 then sd=-3
+360 if ky=160 then gosub 20 
 
-400 if not dx and not dy then return
-410 ax=dx:ay=dy:as=ds
-420 dy=dy+2:if dy > 160 then dx=0:dy=0
-430 ds=ds+1:if ds > dc+3 then ds=dc
-430 xdraw as at ax,ay
-440 if not dx and not dy then return
-450 xdraw ds at dx,dy
-460 return
+400 x=x+sd
+410 if x < 10 then x=10
+420 if x > 270 then x=270
+
+500 di=di+1:if di > mm then di = 1
+510 if not dx(di) then 600
+520 ds(di)=ds(di)+1:if ds(di) > dc+3 then ds(di)=dc
+530 dy(di)=dy(di)+2:if dy(di) > 160 then dx(di)=0:dy(di)=0:ds(di)=0
+
+600 xdraw os at ox,10
+610 for i=1 to mm
+620 if ox(i) then xdraw os(i) at ox(i),oy(i)
+630 next i
+640 goto 200 
 
 49999 end
 50000 $shape src="ships.st", poke=yes, init=yes, assign=(sb="sub-left", sh="ship-left", dc="depthcharge-1")
-