Shooting Game 2 (random direction and speed)

Zhaoxu Liu / slandarer
/
Shooting Game 2 (random direction and speed)
on 4 Nov 2026
2
53
15
3
6034
game.m
function g = game()
%game Your one-button game.
%
%   Build your game by filling in the three functions below:
%   initState, updateState, and renderFrame. See README.md for the
%   full contract, idioms, and a worked example.
%
%   Workflow:
%       >> minihackContest.validate   % check the contract and contest rules
%       >> minihackContest.play       % play locally at 30 fps
%       >> minihackContest.submit     % publish to the contest

g.init   = @initState;
g.update = @updateState;
g.render = @renderFrame;
end

function state = initState(ax)
state = struct();

% board position and speed
state.X = 400;
state.Y = 300;
state.V = [5, 5];

state.holeX = 2000.*ones(3,1);  % bullet hole x-positions
state.holeY = 2000.*ones(3,1);  % bullet hole x-positions
state.shotCount = -1;           % -1: not started
state.score = [0, 0, 0];        % scores for 3 shots

% temporary data
t1 = linspace(0, 2*pi, 50).';
t2 = linspace(0, 2*pi, 200);
tr = 20:20:100;
tx = cos([t1; nan]).*tr;
ty = sin([t1; nan]).*tr;
state.Y = 300;
c1 = [96,119,76]./255;
c2 = [54,60,36]./255;

% X-coordinates of the board shape templates
state.boardX = [-110, 110, 110, -110];
state.bkgX = [-95, -98, -25, -30, -25, 0, 25, 30, 25, 98, 95];
state.ringX = tx(:);
state.eyeX = cos(t1).*20;
state.scoreX = [-90, -70, -50, -30, 0, 30, 50, 70, 90];
state.standX = [0, 0];
state.linkX = [-50, 50, nan, -15, -15, nan, 15, 15, nan, 0, 0, nan, 50, -50];

% Y-coordinates of the board shape templates
state.boardY = state.boardX([1, 1, 2, 2]);
state.bkgY = [-90, 20, 40, 60, 97, 101, 97, 60, 40, 20, -90] ;
state.ringY = ty(:);
state.eyeY = sin(t1).*20;
state.scoreY = 7.*ones(1, 9);
state.standY = [-360, -110];
state.linkY = [-50, 50, nan, -15, -15, nan, 15, 15, nan, 0, 0, nan, 50, -50];


% Create graphics objects
state.boardHdl = fill(ax, state.boardX + state.X, state.boardY + state.Y, [1,1,1], 'LineWidth',4, 'EdgeColor',c1);
state.bkgHdl   = fill(ax, state.bkgX + state.X, state.bkgY + state.Y, c1, 'EdgeColor','none');
state.ringHdl  = plot(ax, state.ringX + state.X, state.ringY  + state.Y, 'LineWidth',2, 'Color','w');
state.eyeHdl   = fill(ax, state.eyeX + state.X, state.eyeY + state.Y, [1,1,1], 'EdgeColor','none');
state.scoreHdl = text(ax, state.scoreX + state.X, state.scoreY + state.Y, {'6','7','8','9','10','9','8','7','6'}, ...
    'FontSize',15, 'HorizontalAlignment','center', 'Color','w', 'FontWeight','bold');
state.scoreHdl(5).Color = c1;
state.standHdl = plot(ax, state.standX + state.X, state.standY + state.Y, 'Color',c1, 'LineWidth',14);
state.info = {'Shot-1 score: '; 'Shot-2 score: '; 'Shot-3 score: '; 'Total score: '};
state.infoHdl = text(ax, 5, 595, state.info, 'FontSize',14, 'VerticalAlignment','top', 'FontWeight','bold', 'Color',[.3,.3,.3]);
state.startHdl = text(ax, 400, 445, "Press SPACE to start", 'HorizontalAlignment','center', ...
    'FontWeight','bold', 'Color',[.3,.3,.3], 'FontSize',35);
state.holeHdl1 = plot(ax, state.holeX + state.X, state.holeY + state.Y, 'r+', 'LineWidth',2, 'MarkerSize',15);
state.holeHdl2 = plot(ax, state.holeX + state.X, state.holeY + state.Y, 'bx', 'LineWidth',2, 'MarkerSize',15);
plot(ax, 400 + [-220, 220], [100, 100] - 30, 'Color',c1, 'LineWidth',6)
plot(ax, 400 + [-210, 210], [85, 85] - 30, 'Color',c1, 'LineWidth',6)
state.linkHdl = plot(ax, state.linkX + state.X, [100, 100, nan, 100, 85, nan, 100, 85, nan, 100, 120, nan, 85, 85] - 30, 'Color',c2, 'LineWidth',8);
for i = 1:30
    plot(ax, cos(t2).*(300 + i.*1.2) + 400, sin(t2).*(300 + i.*1.2) + 300, 'LineWidth',2, 'Color',[1,1,1].*(.9^i))
end
plot(ax, [70, 220, nan, 580, 730, nan, 400, 400, nan, 400, 400] , [300, 300, nan, 300, 300, nan, 0, 120, nan, 480, 600], 'Color','k', 'LineWidth',8)
plot(ax, [220, 580, nan, 400, 400],[300, 300, nan, 120, 480], 'Color','k', 'LineWidth',1, 'LineStyle',':')
end

function state = updateState(state, ~, pressed)
if pressed && state.shotCount < 3
    state.shotCount = state.shotCount + 1;
    if state.shotCount > 0 
        if abs(state.X - 400) <= 110 && abs(state.Y - 300) <= 110 % Hit: compute hole position and score
            state.holeX(state.shotCount) = 400 - state.X; 
            state.holeY(state.shotCount) = 300 - state.Y; 
            state.score(state.shotCount) = 10 - floor(sqrt((400 - state.X).^2 + (300 - state.Y).^2)/20);
            if state.score(state.shotCount) < 6
                state.score(state.shotCount) = 0;
            end
            state.info{state.shotCount} = [state.info{state.shotCount}, num2str(state.score(state.shotCount))];
        else
            state.info{state.shotCount} = [state.info{state.shotCount}, 'miss']; % Miss
        end
    end
    if state.shotCount == 3 % All shots done: show total
        state.info{end} = [state.info{end}, num2str(sum(state.score))];
    end
end
if state.shotCount < 3 && state.shotCount > -1
    if abs(state.X - 400) >= 150 || abs(state.Y - 300) >= 100
        tV = [0, 0];
        while all(tV == 0)
            % random direction
            tV = - rand([1, 2]).*sign([state.X - 400, state.Y - 300]);
        end
        tV = tV./norm(tV);
        % random speed
        state.V = (rand(1).*5 + 5).*tV;
    end
    state.X = state.X + state.V(1);
    state.Y = state.Y + state.V(2);
end
end

function renderFrame(~, state)
if state.shotCount > -1
    state.startHdl.String = ' ';
end
state.boardHdl.XData = state.boardX + state.X;
state.bkgHdl.XData   = state.bkgX + state.X;
state.ringHdl.XData  = state.ringX + state.X;
state.eyeHdl.XData   = state.eyeX + state.X;
state.standHdl.XData = state.standX + state.X;
state.linkHdl.XData = state.linkX + state.X;
state.holeHdl1.XData = state.holeX + state.X;
state.holeHdl2.XData = state.holeX + state.X;

state.boardHdl.YData = state.boardY + state.Y;
state.bkgHdl.YData   = state.bkgY + state.Y;
state.ringHdl.YData  = state.ringY + state.Y;
state.eyeHdl.YData   = state.eyeY + state.Y;
state.standHdl.YData = state.standY + state.Y;
state.holeHdl1.YData = state.holeY + state.Y;
state.holeHdl2.YData = state.holeY + state.Y;
state.infoHdl.String = state.info;
for i = 1:9
    state.scoreHdl(i).Position(1) = state.scoreX(i) + state.X;
    state.scoreHdl(i).Position(2) = state.scoreY(i) + state.Y;
end
end
Play Game
Preview

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