BEAT DRUM: One-Button Rhythm Game

ziqi
/
BEAT DRUM: One-Button Rhythm Game
on 5 Nov 2026
3
21
7
0
7826
game.m
function g = game()
% BEAT DRUM - one-button rhythm game for the MATLAB Minihack.
g.init = @initGame;
g.update = @updateGame;
g.render = @renderGame;
end

function s = initGame(ax)
ax.XLim = [0 800]; ax.YLim = [0 600]; ax.YDir = 'reverse';
ax.Color = [0.035 0.055 0.10];
s.t = 0; s.score = 0; s.combo = 0; s.miss = 0; s.mode = 0;
s.flash = 0; s.message = 'TAP TO START'; s.chart = makeChart();
s.judged = false(size(s.chart.t)); s.x = 0;
ink = [0.91 0.95 1]; cyan = [0.18 0.84 0.91]; red = [1 0.31 0.36]; gold = [1 0.78 0.30]; muted = [0.48 0.59 0.73];
s.bg = rectangle(ax,'Position',[0 0 800 600],'FaceColor',[0.035 0.055 0.10],'EdgeColor','none','HitTest','off','PickableParts','none');
s.panel = rectangle(ax,'Position',[35 35 730 530],'Curvature',0.03,'FaceColor',[0.075 0.105 0.17],'EdgeColor',[0.13 0.20 0.30],'LineWidth',2,'HitTest','off','PickableParts','none');
s.title = text(ax,75,92,'BEAT DRUM','Color',ink,'FontSize',28,'FontWeight','bold','FontName','Arial','HitTest','off');
s.sub = text(ax,75,122,'ONE BUTTON RHYTHM GAME','Color',cyan,'FontSize',12,'FontWeight','bold','FontName','Arial','HitTest','off');
s.hud = text(ax,725,92,'SCORE 00000','Color',ink,'FontSize',16,'FontWeight','bold','FontName','Arial','HorizontalAlignment','right','HitTest','off');
s.missText = text(ax,725,122,'MISS 0 / 3','Color',red,'FontSize',14,'FontWeight','bold','FontName','Arial','HorizontalAlignment','right','HitTest','off');
s.drum = rectangle(ax,'Position',[300 190 200 145],'Curvature',0.18,'FaceColor',[0.12 0.23 0.32],'EdgeColor',cyan,'LineWidth',5,'HitTest','off','PickableParts','none');
s.drumTxt = text(ax,400,263,'DRUM','Color',ink,'FontSize',24,'FontWeight','bold','FontName','Arial','HorizontalAlignment','center','VerticalAlignment','middle','HitTest','off');
s.msg = text(ax,400,365,'TAP TO START','Color',gold,'FontSize',18,'FontWeight','bold','FontName','Arial','HorizontalAlignment','center','HitTest','off');
text(ax,75,418,'UPCOMING BEATS','Color',ink,'FontSize',14,'FontWeight','bold','FontName','Arial','HitTest','off');
text(ax,725,418,'CYAN = DONG     RED = DA / HIT','Color',muted,'FontSize',12,'FontName','Arial','HorizontalAlignment','right','HitTest','off');
s.lane = rectangle(ax,'Position',[75 445 650 70],'Curvature',0.08,'FaceColor',[0.035 0.060 0.10],'EdgeColor',[0.17 0.26 0.36],'LineWidth',1.5,'HitTest','off','PickableParts','none');
s.hitline = line(ax,[245 245],[445 515],'Color',gold,'LineWidth',3,'HitTest','off');
text(ax,245,535,'HIT','Color',gold,'FontSize',11,'FontName','Arial','HorizontalAlignment','center','HitTest','off');
s.dong = scatter(ax,nan,nan,65,cyan,'filled','HitTest','off','PickableParts','none');
s.da = scatter(ax,nan,nan,95,red,'filled','MarkerEdgeColor',[1 0.78 0.75],'LineWidth',1,'HitTest','off','PickableParts','none');
s.current = scatter(ax,nan,nan,125,gold,'filled','MarkerEdgeColor','w','LineWidth',1,'HitTest','off','PickableParts','none');
text(ax,75,540,'FAR','Color',muted,'FontSize',11,'FontName','Arial','HitTest','off');
text(ax,725,540,'NEAR','Color',muted,'FontSize',11,'FontName','Arial','HorizontalAlignment','right','HitTest','off');
text(ax,400,565,'Tap anywhere: start, then hit red notes at the gold line. Three misses end the run.','Color',muted,'FontSize',11,'FontName','Arial','HorizontalAlignment','center','HitTest','off');
end

function s = updateGame(s,dt,pressed)
if s.mode == 2
    if pressed
        s.mode = 1; s.t = 0; s.score = 0; s.combo = 0; s.miss = 0;
        s.chart = makeChart(); s.judged = false(size(s.chart.t)); s.message = 'GET READY';
    end
    return
end
if s.mode == 0
    if pressed
        s.mode = 1; s.t = 0; s.score = 0; s.combo = 0; s.miss = 0;
        s.chart = makeChart(); s.judged = false(size(s.chart.t)); s.message = 'GET READY';
    end
    return
end
s.t = s.t + dt;
if pressed
    ids = find(s.chart.kind == 2 & ~s.judged);
    if isempty(ids)
        s.miss = s.miss + 1; s.combo = 0; s.message = 'MISS'; s.flash = 0.18;
    else
        [d,k] = min(abs(s.chart.t(ids)-s.t)); id = ids(k);
        if d <= 0.18
            s.judged(id) = true; s.score = s.score + 100; s.combo = s.combo + 1; s.message = 'NICE!'; s.flash = 0.12;
        else
            s.miss = s.miss + 1; s.combo = 0; s.message = 'EARLY / LATE'; s.flash = 0.18;
        end
    end
end
ids = find(s.chart.kind == 2 & ~s.judged & s.chart.t < s.t-0.18);
if ~isempty(ids)
    s.judged(ids) = true; s.miss = s.miss + numel(ids); s.combo = 0; s.message = 'MISS'; s.flash = 0.18;
end
s.flash = max(0,s.flash-dt);
if s.miss >= 3, s.mode = 2; s.message = 'GAME OVER  -  TAP TO REPLAY';
elseif s.t >= s.chart.endTime, s.mode = 2; s.message = 'RUN COMPLETE  -  TAP TO REPLAY';
end
end

function renderGame(~,s)
set(s.hud,'String',sprintf('SCORE %05d   COMBO x%d',s.score,s.combo));
set(s.missText,'String',sprintf('MISS %d / 3',s.miss));
set(s.msg,'String',s.message);
if s.mode == 0, set(s.msg,'String','TAP TO START'); end
if s.mode == 1
    x = 245 + (s.chart.t-s.t)*100;
    visible = x >= 75 & x <= 725;
    a = visible & s.chart.kind == 1;
    b = visible & s.chart.kind == 2 & ~s.judged;
    c = visible & abs(s.chart.t-s.t) <= 0.18;
    set(s.dong,'XData',x(a),'YData',repmat(480,1,sum(a)));
    set(s.da,'XData',x(b),'YData',repmat(480,1,sum(b)));
    set(s.current,'XData',x(c),'YData',repmat(480,1,sum(c)));
    pulse = 1 + 0.045*sin(s.t*2*pi*2.5);
    set(s.drum,'Position',[400-100*pulse 262-72*pulse 200*pulse 145*pulse]);
elseif s.mode == 0
    set(s.dong,'XData',[],'YData',[]); set(s.da,'XData',[],'YData',[]); set(s.current,'XData',[],'YData',[]);
else
    set(s.dong,'XData',[],'YData',[]); set(s.da,'XData',[],'YData',[]); set(s.current,'XData',[],'YData',[]);
end
if s.flash > 0, set(s.drum,'EdgeColor',[1 0.78 0.30]); else, set(s.drum,'EdgeColor',[0.18 0.84 0.91]); end
end

function c = makeChart()
phrases = [1 0 2 0 1 0 2 0 1 0 2 0 1 0 2 0;1 0 0 2 1 0 2 2 0 1 0 0 2 0 1 0;2 0 1 2 0 1 0 2 1 0 0 2 0 1 2 0;1 2 0 0 1 0 2 0 0 2 1 0 1 2 0 0;0 1 2 0 0 1 0 2 1 0 2 0 0 1 2 0];
c.kind = []; c.t = []; now = 1;
for bar = 1:8
    p = phrases(mod(bar*3+bar^2,size(phrases,1))+1,:);
    step = max(0.22,0.34-0.015*floor((bar-1)/2));
    for j = 1:16
        if p(j) > 0, c.kind(end+1) = p(j); c.t(end+1) = now; end
        now = now + step;
    end
end
c.endTime = now;
end
Play Game
Preview

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