euglena/src/ProjectorApplet.java

import processing.core.PApplet;

import java.util.ArrayDeque;

class ProjectorApplet extends PApplet {
    final int projectorScreenNumber = 2;

    final static int centerX = 860;
    final static int centerY = 540;

    int bgColor = color(0, 0, 0);

    EuglenaApplet parent;
    Calibrator calibrator;

    ArrayDeque<ProjectorCommand> commandQueue;

    ProjectorApplet(EuglenaApplet parent) {
        this.parent = parent;
        calibrator = new Calibrator(this);
        commandQueue = new ArrayDeque<>();
    }

    public void settings() {
        fullScreen(P2D, this.projectorScreenNumber);
    }

    @Override
    public void setup() {
        clear();
        smooth();
//        calibrator.activate();  //for testing
    }

    @Override
    public void draw() {
        calibrator.draw(parent);

        while (!commandQueue.isEmpty()) {
            ProjectorCommand command = commandQueue.getFirst();
            if (command.run(this)) {
                commandQueue.removeFirst();
            } else {
                break;
            }
        }
    }

    public void clear() {
        fill(bgColor);
        noStroke();
        rectMode(CORNER);
        rect(0, 0, width * 4, height * 4);
    }

    public void setBgColor(int c) {
        bgColor = c;
    }

    public void setBgColor(int r, int b, int g) {
        bgColor = color(r, g, b);
    }

    public int getBgColor() {
        return bgColor;
    }

    public float convertXCoord(float x) {
        return (x / calibrator.magx + width * calibrator.offsetx);
    }

    public float convertYCoord(float y) {
        return (y / calibrator.magy + height * calibrator.offsety);
    }

    public float convertXDistance(float dx) {
        return (dx / calibrator.magx);
    }

    public float convertYDistance(float dy) {
        return (dy / calibrator.magy);
    }
}