package raytrace;

import processing.core.PApplet;


public class Raytrace extends PApplet {
    public static void main(String[] args) {
    }

    double yaw = Math.PI*-0.25;
    double pitch = Math.PI*-0.1875;
    double x;
    double y;
    double z;
    double d;
    int screenX;
    int screenY;
    int shade;
    int cont = 0;
    double distance;
    double xv;
    double yv;
    double zv;
    int frames = 0;
    double trueYaw = Math.PI*0.1;
    double truePitch = Math.PI*0.5;
    double collisionAccuracy = 0.1;
    int oldY;
    //boolean isTouching;
    int r;
    int g;
    int b;
    double plus = 0;
    int shadowY;

    public boolean check(double X, double Y, double Z) {
        //isTouching = false;
        r= 0;
        g = 0;
        b = 0;
        //System.out.println(Y);
        if (Z > 20 && Z < 30 && X > -5 && X < 5 && Y > -5 && Y < 5) {
            //System.out.println("blue");
            r = 0;
            g = 0;
            b = 1;
            //System.out.println("true");
            return true;
        }
        //System.out.println(Y);
        if (Y < -50) {
            //System.out.println("red");
            r = 1;
            g = 0;
            b = 0;
            return true;
        }
        return false;
        /* if ((Math.sqrt(Math.sin(yaw)*Math.sin(yaw)+Math.sin(pitch)*Math.sin(pitch)+Math.cos(yaw)-20*Math.cos(yaw+Math.sin(pitch)-20*Math.cos(yaw+Math.sin(pitch))))) < 5) {
            //System.out.println("green");
            r = 0;
            g = 1;
            b = 0;
            isTouching = true;
         */
    }


    public void cast(double YAW, double PITCH) {
        //yaw = 0;
        //pitch = 0;
        //speed = speed + 1;
        //System.out.println(speed);
        cont = 0;
        x = -5;
        y = 15;
        z = 25;
        //System.out.println(Math.sqrt(Math.sin(yaw)*Math.sin(yaw)+Math.sin(pitch)*Math.sin(pitch)+Math.cos(yaw)*Math.cos(yaw+Math.sin(pitch)*Math.cos(yaw+Math.sin(pitch)))));
        /*
        xv = (Math.sin(YAW)*collisionAccuracy);
        yv = (Math.sin(PITCH)*collisionAccuracy*(Math.cos(YAW-Math.PI*trueYaw)));
        zv = (Math.cos(YAW)*collisionAccuracy);
         */

        xv = (Math.sin(YAW)*collisionAccuracy)*Math.cos(PITCH);
        yv = (Math.sin(PITCH)*collisionAccuracy);
        zv = (Math.cos(YAW)*collisionAccuracy)*Math.cos(PITCH);
        distance = 0;
        do {
            x = x + xv;
            y = y + yv;
            z = z + zv;
            distance = distance + collisionAccuracy;
            //System.out.println("x " + x + "y " + y + "z " + z);
            ;
            if (check(x, y, z)) {
                oldY = (int)y;
                cont = 1;
                shadowY = 500;
                do {
                    shadowY = shadowY - 1;
                } while (!check(x, shadowY, z));
                if ((oldY-1) < shadowY && (oldY+1) > shadowY ) {
                    fill (r*255,g*255,b*255);
                }else{
                    fill (r*100,g*100,b*100);
                }

                //cont = 1;
                //System.out.println("DETECTED CUBE");
            }
            if (distance > 200 && cont == 0) {
                fill (0, 0, 0);
                cont = 1;

            }
        } while (cont == 0);

    }



    public void setup() {
        size(1200,900);
        screenX = 0;
        screenY = 0;
    }
    public void draw() {
        background(255);
        noStroke();
        screenX = 0;
        screenY = 900;
        pitch = Math.PI*-0.1875+Math.PI*truePitch;
        yaw = Math.PI*-0.25+Math.PI*trueYaw;
        //plus = plus + 0.1;
        //yaw = yaw + plus;
        do {
            do {
                yaw = yaw + ((Math.PI*0.5)/1200);
                //System.out.println("screenX" + screenX);
                screenX = screenX + 1;
                cast(yaw, pitch);
                rect(screenX,screenY,1,1);
            } while(screenX < 1200);
            //System.out.println("screenY" + screenY);
            screenY = screenY - 1;
            pitch = pitch + ((Math.PI*0.375)/900);
            yaw = Math.PI*-0.25+Math.PI*trueYaw + plus;
            screenX = 0;
            cast(yaw, pitch);
            rect(screenX,screenY,1,1);
        } while(screenY > 0);
        frames = frames + 1;
        System.out.println(frames);
    }
}




//Math.PI*0.25 Math.PI*0.1875