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clear;
%%%%%%%%
% "constants" %
%%%%%%%%
% how many updates per second, determines the length of audio snippets
const_frames_per_second = 60;
const_Fs = 96000; % sampling rate in Hz
const_te = 1/const_frames_per_second; % signal duration in seconds
const_samples_per_frame = const_Fs * const_te;
const_sample_range = 0:const_samples_per_frame-1;
const_fade_speed = 0.2;
% signal "generator"
signal = @(freq, amp) sin(freq ./ const_Fs .* 2 .* pi .* const_sample_range) * amp;
% time given for calculation
const_calc_offset = 5;
% dimensions to use for detecting number of hands in frame
zero_hands = size(NaN(0,0));
one_hand = size(NaN(1,1));
two_hands = size(NaN(1,2));
%%%%%%%%%%%%%%%%%%%
% init matleap by calling for first frame %
%%%%%%%%%%%%%%%%%%%
matleap_frame;
% runtime vars
P = NaN(100000,3);
count = 1;
done = false;
freq_one = 0;
freq_two = 0;
signal_one = signal(0,0);
signal_two = signal(0,0);
full_signal = signal_one + signal_two;
complete_signal = full_signal;
% time gestures, used for program termination
gesture_count = 0;
%while count < 100000 && gesture_count < 3
while gesture_count < (1.5 * (const_frames_per_second - const_calc_offset))
frame = matleap_frame;
handCount = size(frame.hands);
if isequal(zero_hands, handCount)
gesture_count = 0;
% slowly lower volume if no hand is there
signal_one = signal_one * const_fade_speed;
signal_two = signal_two * const_fade_speed;
% TODO
elseif isequal(one_hand, handCount)
% fade hand two out
signla_two = signal_two * const_fade_speed;
pos = frame.hands(1).palm.stabilized_position;
signal_one = get_theremin_sound_bit(pos(1), pos(2), signal);
P(count, 1:3) = pos;
count = count + 1;
if frame.gesture > 0
gesture_count = gesture_count + 1;
else
gesture_count = 0;
end
elseif isequal(two_hands, handCount)
gesture_count = 0;
pos = frame.hands(1).palm.stabilized_position;
signal_one = get_theremin_sound_bit(pos(1), pos(2), signal);
P(count, 1:3) = pos;
count = count + 1;
pos = frame.hands(2).palm.stabilized_position;
signal_two = get_theremin_sound_bit(pos(1), pos(2), signal);
else
"That should not happen:"
handCount
return;
end
% play current sound
full_signal = signal_one + signal_two;
complete_signal = [complete_signal full_signal];
% enforce frame rate, leaving a bit of room for calculation
java.lang.Thread.sleep((1/(const_frames_per_second - const_calc_offset)) * 1000);
end
theremin_player = audioplayer(complete_signal, const_Fs);
play(theremin_player);
% extract values
x = P(:,1); % links (-) rechconst_Ts (+) (LED zu uns)
y = P(:,2); % oben unten
z = P(:,3); % vorne (+) hinten (-) (LED zu uns)
% plot
figure("Position",[0,0, 1200, 2400]);
t = tiledlayout(4,1);
nexttile;
plot(x);
ylabel('left right');
nexttile;
plot(y);
ylabel('height');
nexttile;
plot(z);
ylabel('depth');
nexttile;
plot3(z,x,y);
xlabel('depth');
ylabel('left right');
zlabel('height');
function sound = get_theremin_sound_bit(x, y, generator)
% finding ranges for x and y:
%'x'
%min(x)
%max(x)
%'y'
%min(y)
%max(y)
% --> -300 < x < 300
% --> 0 < y < 600
% therefore
volume = y / 600;
frequency = (x + 300) / 600 * 3000; % https://web.physics.ucsb.edu/~lecturedemonstrations/Composer/Pages/60.17.html # How it works
sound = generator(frequency, volume);
end
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