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#ifndef LLMR_UTIL_ANIMATION
#define LLMR_UTIL_ANIMATION
#include <llmr/util/noncopyable.hpp>
#include <llmr/platform/platform.hpp>
namespace llmr {
namespace util {
class animation : private noncopyable {
public:
enum state {
running,
complete
};
animation(double duration)
: start(platform::time()),
duration(duration) {}
double progress() const {
return (platform::time() - start) / duration;
}
virtual state update() const = 0;
virtual ~animation();
protected:
const double start, duration;
};
class ease_animation : public animation {
public:
ease_animation(double from, double to, double& value, double duration);
state update() const;
private:
const double from, to;
double& value;
};
template <typename T>
class timeout : public animation {
public:
timeout(T final_value, T& value, double duration)
: animation(duration),
final_value(final_value),
value(value) {}
state update() const {
if (progress() >= 1) {
value = final_value;
return complete;
} else {
return running;
}
}
private:
const T final_value;
T& value;
};
}
}
#endif
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