animation.h

/**
 * @file animation.h
 *
 * Defintion for a class that encapsulates creating animated images from a
 * set of PNG object frames.
 *
 * @author Aria Buckles
 * @date Fall 2011
 */
#ifndef _ANIMATION_H_
#define _ANIMATION_H_

#include <string>
#include <vector>

#include "cs221util/PNG.h"

using namespace std;
using namespace cs221util;

/**
 * Animation class---used to create animated images from a sequence of PNG
 * objects as frames of the animation.
 *
 * @author Aria Buckles
 * @date Fall 2011
 */
class animation
{
  public:
    /**
     * Adds a frame to the animation.
     *
     * @param img The image to be added.
     */
    void addFrame(const PNG &img);

    /**
     * Writes the animation to the file name specified.
     *
     * @param filename The name of the file to be written to.
     */
    PNG write(const std::string &filename);

  private:
    std::vector<PNG> frames;

    template <typename T> string to_string(const T &value);
    string getString(int i, int padToSameLengthAs);
    bool exists(const string &path);
};

#endif