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    <p>Here's an example to show you how to animate something. This is exactly what that Star Wars animation is. It's a gigantic text file split up into individual frames. Read the FAQ at the <a href="http://www.asciimation.co.nz/" rel="nofollow noreferrer" title="Star Wars ASCIImation">Star Wars ASCIImation page</a> to find out more about it.</p> <p>The general idea is that you have a set of frames. Each frame contains one image in the animation. You clear the screen, show a frame, and then wait for some time period. Do that over and over, and you have a text animation.</p> <p>So first you create a file with your frames. Call it frames.txt. To allow variable-length frames, we follow each frame by a line that begins with <strong>@!</strong> followed by the number of animation ticks that frame should stay on the screen. For example, if you're drawing at 15 frames per second and the line is <strong>@! 15</strong>, then the frame will be on screen for 1 second (15 ticks).</p> <pre><code>+---------+ | frame 1 | +---------+ @! 15 .-----------. | frame 2 | | | `-----------' @! 15 +-------------+ | frame 3 | | | | | | | +-------------+ @! 15 .-----------. | frame 4 | | | .-----------. @! 15 +---------+ | frame 5 | +---------+ @! 3 +---------+ | rame 5 | +---------+ @! 3 +---------+ | ame 5 | +---------+ @! 3 +---------+ | me 5 | +---------+ @! 3 +---------+ | e 5 | +---------+ @! 3 +---------+ | 5 | +---------+ @! 3 +---------+ | | +---------+ @! 3 </code></pre> <p>Then compile and run this program. On Linux or OSX, I just save it as <em>text_animate.cpp</em> and run <em>make text_animate</em>. On Windows maybe the only thing you'll have to do is change the line that says system("clear") to system("cls"), but I don't know for sure.</p> <pre><code>#include &lt;iostream&gt; #include &lt;string&gt; #include &lt;ctime&gt; #include &lt;fstream&gt; const char *FRAME_DELIM = "@!"; unsigned int FRAME_DELIM_LEN = strlen(FRAME_DELIM); int main(int argc, char *argv[]) { if( argc != 2 ) { std::cout &lt;&lt; "Usage: text_animate &lt;frames file&gt;\n"; exit(1); } std::string frames_fn = argv[1]; struct timespec sleep_time = {0, 1000000000 / 15}; // 15 fps std::ifstream file_stream; file_stream.open(frames_fn.c_str(), std::ios::in); if( !file_stream.is_open() ) { std::cout &lt;&lt; "Couldn't open [" &lt;&lt; frames_fn.c_str() &lt;&lt; "]\n"; return -1; } std::string frame_line; unsigned int frame_ticks = 0; while( true ) { system("clear"); bool is_frame_delim = false; do { getline(file_stream, frame_line); if( file_stream.fail() &amp;&amp; file_stream.eof()) { file_stream.clear(); file_stream.seekg(0, std::ios::beg); getline(file_stream, frame_line); } else if( file_stream.fail() ) { std::cout &lt;&lt; "Error reading from file.\n"; break; } is_frame_delim = strncmp(frame_line.c_str(),FRAME_DELIM, FRAME_DELIM_LEN) == 0; if( !is_frame_delim ) { std::cout &lt;&lt; frame_line &lt;&lt; "\n"; } } while( !is_frame_delim ); frame_ticks = atoi(&amp;(frame_line.c_str()[FRAME_DELIM_LEN + 1])); while( frame_ticks-- &gt; 0 ) { nanosleep(&amp;sleep_time, NULL); } } file_stream.close(); return 0; } </code></pre> <p>Then just run <strong>./text_animate frames.txt</strong>. Press CTRL-C to exit since it loops forever.</p>
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