Trembling during animation

In such cases, the Draw/Update cycle is usually organized. I will give an example:

 // в начале приложения при инициализации: lastUpdateTime = GetCurrentTime(); // ... // код регулярно вызываемого метода // (например, цикл обработки сообщений) void DoWork() { now = GetCurrentTime(); while (lastUpdateTime + updateStep <= now) { Update(); lastUpdateTime += updateStep; } Draw(); } 

where updateStep is the time allotted for the logic update step; usually equal to 1000 / FramePerSecond , if measured in milliseconds.

In the Update() method, we update the state (in this case, the motion tween), and in the Draw() method, we draw the scene.

To organize a similar method, I think, is not difficult.

There were problems with the timer, partially solved. The system timer is buggy, it is necessary to average over time, take 10 frames of the last and take the average for this time. On half of the computers. It helped, on the other not (.

If the OS is windows, then: if you specify a number (in this case, 1 ms) as a parameter of the sleep () function, then the stream will “sleep” from 1 to <any number of ms, as the stream manager decides. If you need to get as close as possible to the "sleep" time (sleep ()), then you can try the following:

 #include <windows.h> ... timeBeginPeriod( 1 ); // в мсек ... //ваш код ... timeEndPeriod( 1 ); //В файл проекта подключить либу LIBS += -lwinmm 

The problem can be solved by multiplying all calculations by n \ number of frames in t seconds.

Where experimentally pick n and t.

something like this n = average number of frames (on the machine where it was written for) T = 0.1 sec. up to 1 sec.