/**
 * Scratch. 
 * by Andres Colubri
 * 
 * Move the cursor horizontally across the screen to set  
 * the position in the movie file.
 */
 
import codeanticode.gsvideo.*;

GSMovie myMovie;

void setup() {
  size(640, 480);
  background(0);
  // Load and set the video to play. Setting the video 
  // in play mode is needed so at least one frame is read
  // and we can get duration, size and other information from
  // the video stream. 
  myMovie = new GSMovie(this, "station.mov");
  myMovie.play();
}

void movieEvent(GSMovie myMovie) {
  myMovie.read();
}

void draw() {
  if (1 < myMovie.width && 1 < myMovie.height) {
  
    // A new time position is calculated using the current mouse location:
    float f = constrain((float)mouseX / width, 0, 1);
    float t = myMovie.duration() * f;
    
    // If the new time is different enough from the current position,
    // then we jump to the new position. But how different? Here the
    // difference has been set to 0.1 (1 tenth of a second), but it can
    // be smaller. My guess is that the smallest value should correspond
    // to the duration of a single frame (for instance 1/24 if the frame rate 
    // of the video file is 24fps). Setting even smaller values seem to lead
    // to choppiness. This will become trickier once the GSMovie.speed()  
    // and GSMovie.frameRate() methods become functional. 
    if (0.1 < abs(t - myMovie.time())) {
      // The movie stream must be in play mode in order to jump to another
      // position along the stream. Otherwise it won't work.
      myMovie.play();
      myMovie.jump(t);
      myMovie.pause();
    }
    image(myMovie, 0, 0, width, height);
  }
}