void Interpolator::Update(uint32 frame_time) {
if (_ValidMethod() == false) {
if (VIDEO_DEBUG)
cerr << "VIDEO WARNING: " << __FUNCTION__ << " was called when an invalid method was set" << endl;
return;
}
// update current time
_current_time += frame_time;
if (_current_time > _end_time) {
_current_time = _end_time;
_finished = true;
}
// Calculate a value from 0.0f to 1.0f that tells how far we are in the interpolation
float progress;
if (_end_time == 0) {
progress = 1.0f;
}
else {
progress = static_cast<float>(_current_time) / static_cast<float>(_end_time);
}
if (progress > 1.0f) {
if (VIDEO_DEBUG)
cerr << "VIDEO WARNING: " << __FUNCTION__ << " calculated a progress value greater than 1.0" << endl;
progress = 1.0f;
}
// Apply a transformation based on the interpolation method
switch(_method) {
case VIDEO_INTERPOLATE_EASE:
progress = _EaseTransform(progress);
break;
case VIDEO_INTERPOLATE_SRCA:
progress = 0.0f;
break;
case VIDEO_INTERPOLATE_SRCB:
progress = 1.0f;
break;
case VIDEO_INTERPOLATE_FAST:
progress = _FastTransform(progress);
break;
case VIDEO_INTERPOLATE_SLOW:
progress = _SlowTransform(progress);
break;
case VIDEO_INTERPOLATE_LINEAR:
// Nothing to do, just use progress value as it is
break;
default:
if (VIDEO_DEBUG)
cerr << "VIDEO WARNING: " << __FUNCTION__ << " the current method did not match any supported methods" << endl;
return;
};
_current_value = Lerp(progress, _a, _b);
} // void Interpolator::Update(uint32 frame_time)
void Interpolator::SetMethod(InterpolationMethod method) {
if (_finished == false) {
if (VIDEO_DEBUG)
cerr << "VIDEO WARNING: " << __FUNCTION__ << " was called when an interpolation was still in progress" << endl;
return;
}
_method = method;
if (_ValidMethod() == false) {
if (VIDEO_DEBUG)
cerr << "VIDEO WARNING: " << __FUNCTION__ << " was passed an invalid method argument" << endl;
}
}
void Interpolator::SetMethod(InterpolationMethod method)
{
if(_finished == false) {
IF_PRINT_WARNING(MODE_MANAGER_DEBUG)
<< " was called when an interpolation was still in progress" << std::endl;
return;
}
_method = method;
if(_ValidMethod() == false) {
IF_PRINT_WARNING(MODE_MANAGER_DEBUG)
<< " was passed an invalid method argument" << std::endl;
}
}
void Interpolator::Start(float a, float b, uint32 milliseconds) {
if (_ValidMethod() == false) {
if (VIDEO_DEBUG)
cerr << "VIDEO WARNING: " << __FUNCTION__ << " was called when an invalid interpolation method was set" << endl;
return;
}
_a = a;
_b = b;
_current_time = 0;
_end_time = milliseconds;
_finished = false;
Update(0); // Do an initial update so that we have a valid value for GetValue()
}
void Interpolator::Start(float a, float b, uint32 milliseconds)
{
if(_ValidMethod() == false) {
IF_PRINT_WARNING(MODE_MANAGER_DEBUG)
<< " was called when an invalid interpolation method was set" << std::endl;
return;
}
_a = a;
_b = b;
_current_time = 0;
_end_time = milliseconds;
_finished = false;
Update(0); // Do an initial update so that we have a valid value for GetValue()
}
