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annotate +anim/animate.m @ 133:43f8df3595cf

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Prepared for dynamic workload in animation.
author Jonatan Werpers <jonatan@werpers.com>
date Fri, 05 Feb 2016 11:29:19 +0100
parents 6ec2248b83c4
children 2fe13db674da
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1 % Calls F(t) repeatedly
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2 % Should there be a Fsetup and a F, two function, to allow creating a plot and then updating it?
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3 % F takes the time to generate the frame for and returns the actual time for the generated frame.
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4 % t = F(t_r) is a function that paints a frame for time t. t is the closest time <=t_r
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5 % it will be called for increasnig t.
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7 %Todo: make it catch up and produce warnings if it lags behind? Instead of just requesting the next target time
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10 % If adapt is true time_modifier is treated as an upper bound
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11 function animate(F, tstart, tend, time_modifier, target_frame_rate)
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12 default_arg('time_modifier', 1);
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13 default_arg('target_frame_rate',30);
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15 % t is simulation time
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16 % tau is real time
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18 time_modifier_bound = time_modifier;
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19 dTau_target = 1/target_frame_rate; % Real time between frames
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21 rs = util.ReplaceableString();
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22 rs.appendFormat(' tau: %d\n');
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23 rs.appendFormat(' target tau: %d\n');
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24 rs.appendFormat(' Target fps: %.2f\n');
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25 rs.appendFormat(' Actual fps: %.2f\n');
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26 rs.appendFormat('Target time_modifier: %d\n');
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27 rs.appendFormat('actual time_modifier: %d\n');
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29 animation_start = tic();
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30 prevTau = 0;
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31 targetTau = 0;
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32 tauFrameStart = -dTau_target;
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33 t = F(tstart);
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34
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35 while t < tend
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36 % Sleep until the frame should start
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37 pause(targetTau-toc(animation_start));
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38 tau = toc(animation_start);
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39 dTau = tau - tauFrameStart;
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41 % Calculate error in tau
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42 e_Tau = tau - targetTau;
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44 % Regulate time_modifier based on e_Tau
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45 % time_modifier = min(time_modifier_bound, max(0.5, abs(1-e_Tau/dTau)) * time_modifier);
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46
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47 % Mark the start of the frame
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48 tauFrameStart = tau;
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50 dt_target = dTau_target*time_modifier; % Targeted simulation time between frames
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51
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52 t_prev = t;
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53 t = F(t + dt_target); % Run simulation
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55 % Calculate when this frame should end and the next start. (this depends on what simulation time we ended up on)
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56 dt = t-t_prev;
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57 % targetTau = targetTau + dt/time_modifier;
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58 targetTau = targetTau + dTau_target;
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60 % Update information about this frame
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61 tau = toc(animation_start);
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62 rs.updateParam(tau, targetTau, 1/dTau_target, 1/dTau, time_modifier_bound, time_modifier);
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63 end
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66 % Final time reporting
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67 time_to_animate = toc(animation_start);
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68 expected_time = tend/time_modifier;
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69 fprintf('\n');
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70 fprintf('Time to animate: %.3f\n', time_to_animate)
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71 fprintf('Expected time : %.3f\n', expected_time)
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72 end