euglena/src/Calibrator.java

/* Session when program is initially started, screen changes when
doodle button is pressed */

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


class Calibrator {

    boolean active;
    PImage drawnScreen;
    ProjectorApplet projector;

    /////////////////////// proj img screen alignment
    float offsetx, offsety, magx, magy, rot;

    void reset() {
        magx = 7.4f;        // reduction factor in X
        magy = 6.0f  ;      // reduction factor in Y
        offsetx = 0.423f;   // starts projectorApplet screen at distance from right most edge
        offsety = 0.44f;    // distance from topmost edge
        rot = 0;            // rotation of projection starts at 0 degrees
    }

    Calibrator(ProjectorApplet projector){
        this.projector = projector;
        this.reset();
        this.active = false;
    }

    void toggle() {
        if (this.active) {
            this.deactivate();
        } else {
            this.activate();
        }
    }

    void activate() {
        this.active = true;

        // Tell the projector that we want to save the state of the screen
        //  next time it draws
        ProjectorCommand saveCommand = (ProjectorApplet p) -> {
            this.drawnScreen = p.get(0, 0, p.width, p.height);
            return true;
        };
        projector.commandQueue.add(saveCommand);
    }

    void deactivate() {
        // Create a command which will restore the screen to what it
        //  looked like before we started calibrating
        ProjectorCommand restore_command = (ProjectorApplet p) -> {
            p.clear();
            p.set(0, 0, this.drawnScreen);
            return true;
        };

        // Insert the restore command at the front of the queue
        projector.commandQueue.add(0, restore_command);
        this.active = false;
    }

    void buttonPressed(int keyCode){
        if (!this.active) {
            return;
        }

        // Calibration of projectorApplet field of view
        switch(keyCode) {
            case UP:
                offsety = offsety - .001f; //Moves projections up in app view
                break;
            case DOWN:
                offsety = offsety + .001f; //Moves projections down
                break;
            case LEFT:
                offsetx = offsetx - .001f; // Moves projections left
                break;
            case RIGHT:
                offsetx = offsetx + .001f; // Moves projections right
                break;
            case 36:
                magx = magx + .05f; // HOME button reduces width of projections
                break;
            case 35:
                magx = magx - .05f; // END button increases width of projections
                break;
            case 33:
                magy = magy + .05f; // PAGE UP button reduces height of projections
                break;
            case 34:
                magy = magy - .05f; // PAGE DOWN button increases height of projections
                break;
            case SHIFT:
                println("x-offset: " + offsetx + " | y-offset: " + offsety);
                println("x-magnification: " + magx + " | y-magnification: " + magy);
            default:
                break;
        }
    }

    void draw(EuglenaApplet a) {
        if (!this.active) {
            return;
        }

        projector.clear();

        float x0 = a.width * offsetx;
        float y0 = a.height * offsety;
        float dx = (a.width - a.menu.width)/magx;
        float dy = a.height/magy;

        // Hello World on 2nd Monitor
        projector.noStroke();
        projector.textSize(50);
        projector.fill(projector.color(0, 90, 0));
        projector.text("hello,", x0+20, y0+60);
        projector.fill(projector.color(0, 0, 90));
        projector.text("world!", x0+20, y0+110);

        // Four dots used for calibration (may need to change code so that it better matches the math used to convert other points)
        projector.ellipseMode(CORNER);

        projector.fill(projector.color(0, 0, 190));
        projector.ellipse(x0, y0, 5, 5);

        projector.fill(projector.color(190,0,0));
        projector.ellipse(x0, y0+dy-10, 5, 5);

        projector.fill(255);
        projector.ellipse(x0+dx-5, y0+dy-10, 5, 5);

        projector.fill(projector.color(0, 190, 0));
        projector.ellipse(x0+dx-5, y0, 5, 5);
    }
}