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EnemyTank.cpp
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EnemyTank.cpp
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/*
* EnemyTank.cpp
*/
//System Headers
#include <stdlib.h>
//Dragonfly Headers
#include "EventStep.h"
#include "EventView.h"
#include "GraphicsManager.h"
#include "LogManager.h"
#include "ResourceManager.h"
#include "utility.h"
#include "WorldManager.h"
//Game Headers
#include "EnemyCannonShot.h"
#include "EnemyTank.h"
#include "Score.h"
#include "SmallExplosion.h"
#include "EventFootSoldierDeath.h"
EnemyTank::EnemyTank(df::Position p, df::Object *new_player) {
df::ResourceManager &resource_manager = df::ResourceManager::getInstance();
df::LogManager &log_manager = df::LogManager::getInstance();
// Link to "player" sprite
df::Sprite *p_temp_sprite;
p_temp_sprite = resource_manager.getSprite("enemytank");
if (!p_temp_sprite) {
log_manager.writeLog("EnemyTank::EnemyTank(): Warning! Sprite '%s' not found", "enemytank");
}
else {
setSprite(p_temp_sprite);
setSpriteSlowdown(0);
}
setType("EnemyTank");
setSolidness(df::Solidness::SOFT);
//Set starting position
setPosition(p);
player = new_player;
fire_slowdown = 60;
fire_countdown = fire_slowdown;
move_slowdown = 5;
move_countdown = move_slowdown;
}
// Handle event.
// Return 0 if ignored, else 1.
int EnemyTank::eventHandler(const df::Event *p_e) {
if (p_e->getType() == df::STEP_EVENT) {
step();
fire();
return 1;
}
if (p_e->getType() == df::COLLISION_EVENT) {
const df::EventCollision *p_collision_event = dynamic_cast <df::EventCollision const *> (p_e);
hit(p_collision_event);
return 1;
}
return 0;
}
void EnemyTank::step() {
// Fire countdown.
fire_countdown--;
if (fire_countdown < 0)
fire_countdown = 0;
// Move countdown.
move_countdown--;
if (move_countdown < 0)
move_countdown = 0;
//Move towards player
if (getPosition().getX() < player->getPosition().getX()) {
move(1);
}
else if (getPosition().getX() > player->getPosition().getX()) {
move(-1);
}
else {
setXVelocity(0);
}
}
void EnemyTank::fire() {
// See if time to fire.
if (fire_countdown > 0)
return;
//Reset countdown
fire_countdown = fire_slowdown;
//Check if player is in range
int y_offset = player->getPosition().getY() - getPosition().getY();
int x_offset = player->getPosition().getX() - getPosition().getX();
if (y_offset < df::GraphicsManager::getInstance().getVertical() * 3 / 4 && y_offset > 0 &&
boxIntersectsBox(getWorldBox(this), df::WorldManager::getInstance().getView()) &&
abs(x_offset) < 4) {
// Fire Cannon
EnemyCannonShot *p = new EnemyCannonShot(df::Position(getPosition().getX(), getPosition().getY() + 6));
// Play "cannonFire" sound.
df::Sound *p_sound = df::ResourceManager::getInstance().getSound("cannon-shot");
p_sound->play();
}
}
void EnemyTank::hit(const df::EventCollision *p_collision_event) {
// If PlayerTank or PlayerCannonShot, create explosion and delete Tank
if ((p_collision_event->getObject1()->getType() == "Tank") ||
(p_collision_event->getObject2()->getType() == "Tank") ||
(p_collision_event->getObject1()->getType() == "PlayerCannonShot") ||
(p_collision_event->getObject2()->getType() == "PlayerCannonShot")) {
// Create an explosion.
SmallExplosion *p_explosion = new SmallExplosion(getPosition());
// Play "explode" sound
// Create "footsoldierdeath" event and send to interested Objects.
df::WorldManager &world_manager = df::WorldManager::getInstance();
EventFootSoldierDeath death(this);
world_manager.onEvent(&death);
//Send Points for deletion
df::EventView ev(SCORE_STRING, TANK_POINTS, true);
world_manager.onEvent(&ev);
//Delete this object
world_manager.markForDelete(this);
}
}
// Move up or down.
void EnemyTank::move(int dx) {
// See if time to move.
if (move_countdown > 0)
return;
//Reset countdown
move_countdown = move_slowdown;
// If stays on window, allow move.
df::Position new_pos(getPosition().getX() + dx, getPosition().getY());
df::WorldManager &world_manager = df::WorldManager::getInstance();
if ((new_pos.getX() > world_manager.getView().getCorner().getX()) &&
(new_pos.getX() < world_manager.getView().getCorner().getX() + world_manager.getView().getHorizontal()))
world_manager.moveObject(this, new_pos);
}