#include "enemy.h"
#include <QTimer>


Enemy::Enemy(QGraphicsItem *parent) {
    //set graphics
    setPixmap(QPixmap(":/images/enemy.png"));

    //set points
    points << QPointF(200,200) << QPointF(400,200);
    point_index = 0;
    dest = points[0];
    rotateToPoint(dest);

    QTimer * timer = new QTimer();
    connect(timer, SIGNAL(timeout()), this, SLOT(move_forward()));
    timer->start(150);


}

void Enemy::rotateToPoint(QPointF p) {
    QLineF ln(pos(), p);
    setRotation((-1 * ln.angle()));

}

void Enemy::move_forward() {
    //if close to dest, rotate to next dest
    QLineF ln(pos(), dest);
    if (ln.length() < 5) {
        point_index++;
        if (point_index >= points.size()) {
            return;
        }
        dest = points[point_index];
        rotateToPoint(dest);
    }

    int STEP_SIZE = 5;
    int theta = rotation(); // degrees
    double dy = STEP_SIZE * qSin(qDegreesToRadians(theta));
    double dx = STEP_SIZE * qCos(qDegreesToRadians(theta));

    setPos(x()+dx, y()+dy);
}