zombie.cpp

#include "zombie.h"
#include "plant.h"
Zombie::Zombie(int xp, int yp,int left_speed, Game* gm, BackGround* bkg, int mxnum,int row,int maxlife):
	Unit(xp, yp, gm, bkg, mxnum), left_speed_(left_speed), max_life_(maxlife), life_(maxlife),MAX_EAT_IMAGE(bkg->units_max_image_num_["zombie/attack"]) {
	name_ = "zombie"; type_ = "zombie";
	row_ = row;
}
void Zombie::Update() {
	if (life_ < 0)return;
	if (eating_plant_ != nullptr) {//continue eating
		eat_image_status++;
		if (eat_image_status == MAX_EAT_IMAGE - 1)eat_image_status = 0;
		Attack(); return;
	}
	//otherwise, use normal images
	image_status_++;
	if (image_status_ == max_image_num_ - 1)image_status_ = 0;
	x_ -= left_speed_;
	//not eating, so find whether can eat a new plant
	auto info = bkg_->FindMaxPlant(x_, row_);//find plant to eat
	if (info.second && (info.first > x_-bkg_->GRID_X/2)) {//able to eat
		eating_plant_ = info.second;
	}
	if (x_ < bkg_->GRID_START_X-bkg_->GRID_X) {//reach house
		gm_->Lose();
	}
}
void Zombie::Attack() {
	Plant* plt = dynamic_cast<Plant*>(eating_plant_);
	plt->DeduceLife(FIRE);
	if (plt->life_ < 0) {
		eating_plant_ = nullptr;
	}
}
void Zombie::DeduceLife(int amount,Parameters::Peatype type) {
	if (life_ < 0) {
		return;
	}
	life_ -= amount;
}
void Zombie::Show() {
	if (life_ < 0) {//show dead images
		if (type == Parameters::Peatype::single) {
			bool head_show = false, body_show = false;
			if (die_head_status < bkg_->units_max_image_num_["zombie/head"] - 1)
				head_show = true, Helper::PutTransparentImage(x_, y_, bkg_->GetImage("zombie/head", die_head_status)), die_head_status++;
			if (die_body_status < bkg_->units_max_image_num_["zombie/body"] - 1)
				body_show = true, Helper::PutTransparentImage(x_, y_, bkg_->GetImage("zombie/body", die_body_status)), die_body_status++;
			if (!head_show && !body_show) Removed();//remove after shown
		}
		if (type == Parameters::Peatype::range) {
			bool explode_show = false;
			if (die_explode_status < bkg_->units_max_image_num_["zombies/explode"] - 1) {
				explode_show = true;
				Helper::PutTransparentImage(x_, y_, bkg_->GetImage("zombies/explode", die_explode_status));
				die_explode_status++;
			}
			if (!explode_show) Removed();//remove after shown
		}
	}
	else {
		if (eating_plant_ != nullptr) {//show eating images
			Helper::PutTransparentImage(x_, y_, bkg_->GetImage(name_ + "/attack", eat_image_status));
		}
		else {//show moving images
			Helper::PutTransparentImage(x_, y_, bkg_->GetImage(name_, image_status_));
		}
	}
}