Space Battle

Jitin Beri
/
Space Battle
on 2 Nov 2026
2
23
13
0
9947
game.m
function g = game()
%game Starship gunner — auto-fire upward, one-button direction flip.
%
%   The ship slides left/right along the bottom and fires non-stop.
%   Tap SPACE / click to flip its movement direction. Shoot down the
%   enemies before they reach the bottom or ram you. Every few hundred
%   points a boss arrives and drops bombs — dodge them and shoot it down.
%
%   World is 800x600, y up. Ship sits at y=60 (36 wide, 28 tall).
%   State fields (short names keep us under the character cap):
%     x,d        ship x and direction (+1/-1)
%     cd,st      fire cooldown, spawn timer
%     score,go,over   score, started, game over
%     bX,bY,bA   bullet pool (20)
%     eX,eY,eU,eV,eR,eH,eT,eA   enemy pool (12): pos, vel, radius, hp, type, active
%     mX,mY,mA   boss bomb pool (10)
%     B,bx,by,bv,bh,bt,fl,nb    boss: active, pos, x-vel, hp, bomb timer,
%                               hit-flash timer, score that triggers next boss
%     PX,PY      boss outline relative to its centre
%
%   >> minihackContest.validate
%   >> minihackContest.play
%   >> minihackContest.submit
g.init   = @initState;
g.update = @updateState;
g.render = @renderFrame;
end
function s = initState(ax)
ax.XLim = [0 800];
ax.YLim = [0 600];
ax.YDir = 'normal';
ax.Color = [.02 .02 .08];
% boss outline: wings, glass dome on top (points 3:11), cannon underneath
a=linspace(pi,0,9);
s.PX=[-80 -50 40*cos(a) 50 80 40 15 -15 -40];
s.PY=[0 30 30+22*sin(a) 30 0 -30 -45 -45 -30];
s=resetRound(s);
% --- stars ---
sx=linspace(10,790,60)+mod((1:60)*73,41)-20;
sy=mod((1:60)*137,580)+10;
NV={'HitTest','off','PickableParts','none'};
TB=[{'FontWeight','bold'} NV];
H=[{'EdgeColor','none','Visible','off'} NV];   % pooled, hidden until used
L=[{'LineStyle','none','MarkerEdgeColor','none','Visible','off'} NV];
line(ax,sx,sy,'LineStyle','none','Marker','.','MarkerSize',6,'Color',[.9 .9 1],NV{:});
g.flame=patch(ax,[0 0 0],[0 0 0],[1 .55 .15],'EdgeColor','none','FaceAlpha',.85,NV{:});
g.ship=patch(ax,[0 0 0],[0 0 0],[.75 .85 1],'EdgeColor',[.3 .6 1],'LineWidth',1.2,NV{:});
for i=1:20
    g.bul(i)=rectangle(ax,'FaceColor',[1 1 .4],H{:});
end
for i=1:12
    g.en(i)=rectangle(ax,H{:});
    g.enB(i)=patch(ax,[0 0 0],[0 0 0],'r',H{:});
    g.eye(i)=line(ax,0,0,'Marker','o','MarkerFaceColor','w',L{:});
    g.pup(i)=line(ax,0,0,'Marker','o','MarkerFaceColor','k',L{:});
end
for i=1:10
    g.bomb(i)=rectangle(ax,'Curvature',1,'FaceColor',[1 .45 .1],H{:},'EdgeColor',[1 .9 .5]);
end
g.boss=patch(ax,s.PX,s.PY,'g',H{:},'EdgeColor',[.7 1 .85],'LineWidth',2);
% boss face: glass dome, eyes, pupils, angry brows, cannon glow
g.bz=[patch(ax,s.PX(3:11),s.PY(3:11),[.5 .9 1],H{:},'FaceAlpha',.45) ...
    line(ax,[0 0],[0 0],'Marker','o','MarkerSize',16,'MarkerFaceColor','w',L{:}) ...
    line(ax,[0 0],[0 0],'Marker','o','MarkerSize',7,'MarkerFaceColor',[.8 0 0],L{:}) ...
    line(ax,0,0,'Color','k','LineWidth',4,'Visible','off',NV{:}) ...
    line(ax,0,0,'Marker','o','MarkerFaceColor',[1 .9 .3],L{:})];
g.hp=[rectangle(ax,'Position',[250 566 300 12],'FaceColor',[.25 .25 .3],H{:}) ...
    rectangle(ax,'FaceColor',[.2 .85 .6],H{:})];
% deadly walls: red strips on both edges
for i=[0 788]
    rectangle(ax,'Position',[i 0 12 600],'FaceColor',[1 .15 .2],'EdgeColor','none',NV{:});
end
g.score=text(ax,20,576,'','Color','w','FontSize',16,TB{:});
g.msg=text(ax,400,330,'','FontSize',22,'HorizontalAlignment','center',TB{:});
% legend: three colored squares + point labels
cx=[230 340 450]; col=[.95 .3 .35;.6 .3 .9;.2 .85 .6]; lbl={'+10','+30','BOSS +200'};
for i=1:3
    g.leg(i)=rectangle(ax,'Position',[cx(i)-10 260 20 20],'FaceColor',col(i,:),'EdgeColor','none',NV{:});
    g.leg(i+3)=text(ax,cx(i)+18,270,lbl{i},'Color','w','FontSize',16,TB{:});
end
s.g=g;
end
function s = updateState(s, dt, pressed)
dt=dt*.8; % game speed: 80% of real time
% after death, ignore taps briefly (so a panic tap doesn't skip the
% game-over screen), then one tap restarts straight into play
if s.over
    s.ot=s.ot+dt;
    if pressed && s.ot>.5, s=resetRound(s); s.go=1; end
    return
end
if ~s.go
    s.go=pressed;
    return
end
s.d=s.d*(1-2*pressed);
s.x=s.x+s.d*320*dt;
% ship wing touching a wall strip is fatal
if s.x<30 || s.x>770, s.over=1; return, end
% auto-fire
s.cd=s.cd-dt;
i=find(~s.bA,1);
if s.cd<=0 && any(i)
    s.bA(i)=1; s.bX(i)=s.x; s.bY(i)=88; s.cd=.17;
end
s.bY=s.bY+520*dt;
s.bA=s.bA & s.bY<620;
% per-type table [R HP baseVY vxU vymul fR fG fB eyeSize]; 1=grunt (two eyes), 2=tank (cyclops)
T=[20 1 110 18 1 .95 .3 .35 9; ...
   30 2 70 24 .6 .6 .3 .9 18];
% boss arrives at score thresholds; normal spawns pause while it's up
if ~s.B && s.score>=s.nb
    s.B=1; s.bx=400; s.by=660; s.bh=40; s.bv=110; s.bt=1;
end
s.st=s.st+dt;
i=find(~s.eA,1);
if ~s.B && s.st>=max(.42,1-s.score*.004) && any(i)
    s.st=0;
    tp=1+(mod(floor(s.score*17+i*53),100)<min(30,8+s.score*.1));
    s.eA(i)=1; s.eT(i)=tp; s.eY(i)=640;
    s.eX(i)=60+mod(floor(s.score*29+i*113),680);
    s.eR(i)=T(tp,1); s.eH(i)=T(tp,2);
    s.eV(i)=-T(tp,3)-min(170,s.score*1.2)*T(tp,5);
    s.eU(i)=(mod(i*7+floor(s.score),5)-2)*T(tp,4);
    set([s.g.en(i) s.g.enB(i)],'FaceColor',T(tp,6:8));
    set([s.g.eye(i) s.g.pup(i)],{'MarkerSize'},{T(tp,9);T(tp,9)/2});
end
P=[10 30];
for i=find(s.eA)
    s.eY(i)=s.eY(i)+s.eV(i)*dt;
    s.eX(i)=s.eX(i)+s.eU(i)*dt;
    if s.eX(i)<20 || s.eX(i)>780, s.eU(i)=-s.eU(i); end
    % hit test vs drawn body (hull + bow), bullet swept over the frame
    r=s.eR(i);
    a=max(0,abs(s.bX-s.eX(i))-2); y=s.bY-s.eY(i);
    j=find(s.bA & a<=r & y+6>=.7*a-1.3*r & y-6-(520-s.eV(i))*dt<=.6*r,1);
    if any(j)
        s.bA(j)=0; s.eH(i)=s.eH(i)-1;
        if s.eH(i)<1
            s.eA(i)=0; s.score=s.score+P(s.eT(i));
            continue
        end
        set([s.g.en(i) s.g.enB(i)],'FaceColor',[.85 .6 1]);
    end
    if (s.eX(i)-s.x)^2+(s.eY(i)-60)^2<(r+14)^2, s.over=1; return, end
    s.eA(i)=s.eY(i)>-40;
end
% boss: descend, then sweep side to side dropping bombs
if s.B
    s.fl=s.fl-dt;
    if s.by>470
        s.by=s.by-80*dt;
    else
        s.bx=s.bx+s.bv*dt;
        if s.bx<90 || s.bx>710, s.bx=min(max(s.bx,90),710); s.bv=-s.bv; end
        s.bt=s.bt-dt;
        k=find(~s.mA,1);
        if s.bt<=0 && any(k)
            s.bt=.9; s.mA(k)=1; s.mX(k)=s.bx; s.mY(k)=s.by-45;
        end
    end
    % bullet nose (left/centre/right) inside the drawn outline counts as a hit
    for j=find(s.bA)
        if any(inpolygon(s.bX(j)+[-2 0 2]-s.bx,s.bY(j)+6-s.by+[0 0 0],s.PX,s.PY))
            s.bA(j)=0; s.bh=s.bh-1; s.fl=.06;
        end
    end
    if s.bh<1
        s.B=0; s.score=s.score+200; s.nb=s.score+300; s.mA(:)=0;
    end
end
% bombs vs ship triangle (y 49..88, half-width 18 narrowing toward the nose)
s.mY=s.mY-240*dt;
s.mA=s.mA & s.mY>-20;
y=min(max(s.mY-6,49),88);
s.over=any(s.mA & s.mY<94 & s.mY>43 & abs(s.mX-s.x)-6<18*(88-y)/39);
end
function renderFrame(~, s)
g=s.g;
x=s.x; t=s.d*.18;
g.ship.XData=[x+t*10 x-18-t*4 x+18-t*4];
g.ship.YData=[88 49 49];
g.flame.XData=[x-10 x+10 x];
g.flame.YData=[49 49 29];
g.flame.FaceAlpha=.3+.55*(s.go && ~s.over);
for i=find(s.bA)
    g.bul(i).Position=[s.bX(i)-2 s.bY(i)-6 4 12];
end
setVis(g.bul,s.bA);
% enemies — rectangular hull + triangular bow pointing down.
for i=find(s.eA)
    r=s.eR(i); ex=s.eX(i); ey=s.eY(i);
    g.en(i).Position=[ex-r ey-r*.6 2*r r*1.2];
    g.enB(i).XData=[ex-r ex+r ex];
    g.enB(i).YData=[ey-r*.6 ey-r*.6 ey-r*1.3];
    % eyes (two for grunts, one for tanks); pupils glance down toward the ship
    ox=ex+r*[-.4 .4]*(s.eT(i)<2);
    g.eye(i).XData=ox; g.eye(i).YData=ey+r*[.1 .1];
    g.pup(i).XData=ox+min(max((s.x-ex)/60,-1),1)*r*.12; g.pup(i).YData=ey+r*[0 0];
end
A=repmat(s.eA,4,1);
setVis([g.en;g.enB;g.eye;g.pup],A);
for k=find(s.mA)
    g.bomb(k).Position=[s.mX(k)-6 s.mY(k)-6 12 12];
end
setVis(g.bomb,s.mA);
% boss: green when healthy, reddens as HP drops, white flash on hit
bx=s.bx; by=s.by; z=g.bz;
c=[.9 .25 .2]+s.bh/40*[-.7 .6 .4];
g.boss.XData=s.PX+bx; g.boss.YData=s.PY+by;
g.boss.FaceColor=c+(s.fl>0)*(1-c);
z(1).XData=s.PX(3:11)+bx; z(1).YData=s.PY(3:11)+by;
z(2).XData=bx+[-28 28]; z(2).YData=by+[5 5];
z(3).XData=bx+[-28 28]+min(max((s.x-bx)/30,-4),4); z(3).YData=by+[1 1];
z(4).XData=bx+[-44 -16 NaN 16 44]; z(4).YData=by+[20 12 NaN 12 20];
% cannon glow charges up before each bomb
z(5).XData=bx; z(5).YData=by-38; z(5).MarkerSize=3+14*max(0,1-s.bt/.9);
g.hp(2).Position=[250 566 max(.01,7.5*s.bh) 12];
setVis([g.boss z g.hp],s.B);
g.score.String=sprintf('Score: %d',s.score);
m=g.msg;
m.String='BOSS INCOMING'; m.Color=[.4 1 .7];
if s.over
    m.String=sprintf('DESTROYED — %d\nTap to restart',s.score);
    m.Color=[1 .5 .5];
elseif ~s.go
    m.String='TAP TO TURN — DON''T HIT THE WALLS';
    m.Color=[1 1 .6];
end
setVis(m,s.over || ~s.go || s.B && s.by>470);
setVis(g.leg,~s.go);
end
function setVis(h,on)
% set Visible only where it differs (cheap, keeps render idempotent)
on=on & true(size(h));
for k=1:numel(h)
    if h(k).Visible~=on(k), h(k).Visible=on(k); end
end
end
function s = resetRound(s)
z=zeros(1,12);
s.x=400; s.d=1; s.cd=0; s.st=0;
s.score=0; s.go=0; s.over=0; s.ot=0;
s.bX=zeros(1,20); s.bY=s.bX; s.bA=s.bX;
s.eX=z; s.eY=z; s.eU=z; s.eV=z; s.eR=z; s.eH=z; s.eT=z; s.eA=z;
s.mX=z(1:10); s.mY=s.mX; s.mA=s.mX;
s.B=0; s.nb=200; s.fl=0; s.bx=0; s.by=0; s.bv=0; s.bh=0; s.bt=0;
end
Play Game
Preview

Play Game opens this in MATLAB Drive. Click Run this app there to play.