int main() {
std::vector<vec2> points;
points.reserve(100);
// Since we will be using the ‘smooth’ animation algorithm, we must register
// it with the engine.
SmoothInit::Register();
// The engine is the central place where animation data is stored and
// processed.
MotiveEngine motive_engine;
//! [Duck Example]
// Initialize the Motivator to use the "smooth" animation algorithm.
Motivator2f duck_position;
duck_position.InitializeWithTarget(SmoothInit(), &motive_engine,
Tar2f::Current(kDuckStartPosition));
// Smoothly transition the duck to wherever a touch occurs.
while (FollowDuck()) {
vec2 touch_position;
if (ScreenTouch(&touch_position)) {
// Set the duck's target position, velocity, and time.
duck_position.SetTarget(Tar2f::Target(touch_position, kZeros2f,
kTimeToTouchPosition));
}
// Once per frame, motive_engine.AdvanceFrame() is called to animate *all*
// Motivators at once. In this case, we only have one Motivator,
// but in many applications there will be thousands.
motive_engine.AdvanceFrame(kDeltaTime);
// Draw the duck at its current position.
// Use the velocity to draw motion lines behind the duck, too.
DrawDuck(duck_position.Value(), duck_position.Velocity());
}
//! [Duck Example]
return 0;
}
