euglena/src/Camera.java

import processing.core.*;
import processing.video.*;
import static processing.core.PApplet.*;

class Camera {
    /*
        Camera controller.
        This class is mostly a wrapper around processing.video.Capture.
     */

    // Camera from which we want to update
    Capture cam;

    // The latest image we got from the camera
    PImage latestImage;

    Camera(PApplet applet, int cameraMode) {
        /*
            Initialize a camera.

            If you don't know what to set cameraMode to, just set it to 0
             and then look at the output; this function prints out a list
             of [cameraMode "1920x1080 60fps"] lines which you can use
             to choose the mode you want.
         */
        String[] cameras = Capture.list();

        if (cameras.length == 0) {
            println("There are no cameras available for capture.");
            applet.exit();
        } else {
            println("Available cameras:");
            for(int i = 0; i < cameras.length; i++) {
                println(i, cameras[i]);
            }
            print("Using camera mode ");
            println(cameras[cameraMode]);
            this.cam = new Capture(applet, cameras[cameraMode]);
            this.cam.start();

            latestImage = cam; //initialize unconditionally
        }
    }

    boolean updateImage() {
        boolean newImageAvailable = cam.available();

        if (newImageAvailable) {
            cam.read();
            latestImage = cam;
        }

        return newImageAvailable;
    }

    PImage getImage() {
        return latestImage;
    }

}