particle.h

#pragma once

# include "vector2.h"
# include "atlas.h"
# include "camera.h"
# include "util.h"

class Particle
{
public:
	Particle() = default;
	Particle(const Vector2& position, Atlas* atlas, int lifespan)
		:position(position), atlas(atlas), lifespan(lifespan) {}
	~Particle() = default;

	void set_atlas(Atlas* atlas) {
		this->atlas = atlas;
	}

	void set_position(const Vector2& position) {
		this->position = position;
	}

	void set_lifespan(int ms) {
		lifespan = ms;
	}

	bool check_valid() const{
		return valid;
	}

	void on_update(int delta) {
		timer += delta;
		if (timer >= lifespan) {
			timer = 0;
			idx_frame++;
			if (idx_frame >= atlas->get_size() - 1) {
				idx_frame = atlas->get_size() - 1;
				valid = false;
			}
		}
	}

	void on_draw(const Camera& camera)const {
		ut::putimage_alpha(camera, position.x, position.y, atlas->get_image(idx_frame));
	}

private:
	int timer = 0;
	int lifespan = 0;
	int idx_frame = 0;
	Vector2 position;
	bool valid = true;
	Atlas* atlas = nullptr;
};