duck.cpp

#include "duck.h"
Duck::Duck(Radian angle, double distance) {
    this->position = Polarcoord();

    this->position.theta = angle;
    this->position.r = distance;
    this->frame = 0;
    this->lastTick = SDL_GetTicks();
    this->moveCounter = 0;
    this->frameCounter = 0;
    this->speed = 2;
    this->scoreAdded = false;

    this->status = alive;
}
Duck::Duck(Polarcoord position) {
    Duck(position.theta, position.r);
}
bool Duck::isVisible(Player p) {
    // Calculate the cutoff for the dot product of the two vectors used to calculate visibility based on the field of view.
    double cutoff = 1 - (p.getFov().radVal / (2 * M_PI));
    //printf("CUTOFF: %f\n", cutoff);
    // Calculate the dot product of the duck's position and the player's angle
    double dotproduct = p.getVector().dot(this->position.toAngleVector2());
    // See if the dot product is above the cutoff - if so, the duck is visible.
    //printf("DOTPRODUCT: %f\n", dotproduct);
    return dotproduct > cutoff;
}

int Duck::getFrame() {
    return this->frame;
}

void Duck::nextFrame() {
    this->frame = (this->frame + 1) % 4;
}

void Duck::shot() {
    this->status = killedByPlayer;
    this->frame = 5;
    this->frameCounter = 0;
}

void Duck::update() {

    int currentTick = SDL_GetTicks();
    int tickDiff = currentTick - this->lastTick;
    this->lastTick = currentTick;

    this->moveCounter += tickDiff;
    this->frameCounter += tickDiff;

    if (this->status == alive) {
        if (this->frameCounter > 500) {
            this->frameCounter -= 500;
            this->nextFrame();
        }
        if (this->moveCounter > 2000) {
            this->moveCounter -= 2000;
            this->position.r -= this->speed;
        }
        if (this->position.r <= ATTACK_DIST) {
            // Duck dies.
            this->status = attackedPlayer;
        }
    }
    else if(this->status == killedByPlayer) {
        if (this->frameCounter > 1000) {
            this->status = dead;
        }
    }
    else if (this->status == attackedPlayer) {
        this->status = dead;
    }
}