Add Animator, IAnimation, DeathAnimation (#30)

Author: stanplayzz

lib/include/chomper/animations/deathAnimation.hpp

@@ -0,0 +1,23 @@
+#include "chomper/animator.hpp"
+
+namespace chomper::animation {
+class DeathAnimation : public chomper::IAnimation {
+  public:
+	DeathAnimation(std::span<le::RenderInstance const> instances);
+	void tick(kvf::Seconds dt) final;
+	void draw(le::IRenderer& renderer) const final;
+
+  private:
+	struct Segment {
+		float remaining{};
+		float lifetime{};
+		float rotSpeed{};
+		glm::vec2 velocity{};
+	};
+
+	std::vector<Segment> m_segments{};
+	le::drawable::InstancedQuad m_quads{};
+
+	le::Random m_random{};
+};
+} // namespace chomper::animation

lib/include/chomper/animator.hpp

@@ -0,0 +1,32 @@
+#pragma once
+#include <kvf/time.hpp>
+#include <le2d/drawable/shape.hpp>
+#include <le2d/random.hpp>
+#include <le2d/render_instance.hpp>
+
+namespace chomper {
+class IAnimation : public klib::Polymorphic {
+  public:
+	virtual void tick(kvf::Seconds dt) = 0;
+	virtual void draw(le::IRenderer& renderer) const = 0;
+
+	[[nodiscard]] bool finished() const {
+		return m_finished;
+	}
+
+  protected:
+	bool m_finished{};
+};
+
+class Animator {
+  public:
+	void play(std::unique_ptr<IAnimation> animation);
+
+	void tick(kvf::Seconds dt);
+
+	void draw(le::IRenderer& renderer) const;
+
+  private:
+	std::vector<std::unique_ptr<IAnimation>> m_playing{};
+};
+} // namespace chomper

lib/include/chomper/player.hpp

@@ -1,4 +1,5 @@
 #pragma once
+#include "chomper/animator.hpp"
 #include "chomper/controller.hpp"
 #include "chomper/debug_inspector.hpp"
 #include "chomper/snake.hpp"
@@ -66,5 +67,7 @@ class Player : public IController::IListener, public IDebugInspector, public kli
 	// bool to decide wether to remove the tail, turn false if the snake has eaten
 	bool m_shouldPop = true;
 	bool m_graceMove{};
+
+	Animator m_animator{};
 };
 } // namespace chomper

lib/src/animations/deathAnimation.cpp

@@ -0,0 +1,84 @@
+#include "chomper/animations/deathAnimation.hpp"
+#include "chomper/world_space.hpp"
+#include <numbers>
+
+namespace chomper::animation {
+namespace {
+constexpr auto easeOut(float t) {
+	return 1.f - ((1.f - t) * (1.f - t));
+}
+} // namespace
+
+DeathAnimation::DeathAnimation(std::span<le::RenderInstance const> instances) {
+	m_segments.clear();
+	m_segments.reserve(instances.size());
+	m_quads.instances.clear();
+	m_quads.instances.reserve(instances.size());
+	m_quads.create(tileSize_v);
+
+	for (auto const& instance : instances) {
+		auto dir = m_random.next_float(0, 360);
+		auto lifetime = m_random.next_float(2, 5);
+		auto speed = m_random.next_float(300, 600);
+		auto rotSpeed = m_random.next_float(5.f, 20.f);
+
+		auto rad = dir * std::numbers::pi_v<float> / 180.f;
+
+		Segment seg;
+		seg.rotSpeed = rotSpeed;
+		seg.velocity = {std::cos(rad) * speed, std::sin(rad) * speed};
+		seg.remaining = lifetime;
+		seg.lifetime = lifetime;
+
+		m_quads.instances.emplace_back().tint = instance.tint;
+		m_quads.instances.back().transform = instance.transform;
+
+		m_segments.push_back(seg);
+	}
+}
+
+void DeathAnimation::tick(kvf::Seconds dt) {
+	assert(m_segments.size() == m_quads.instances.size());
+
+	auto animating = false;
+
+	for (std::size_t i = 0; i < m_segments.size(); i++) {
+		auto& seg = m_segments[i];
+		if (seg.remaining <= 0.f) {
+			continue;
+		}
+
+		seg.remaining -= dt.count();
+
+		auto t = std::clamp(1.f - (seg.remaining / seg.lifetime), 0.f, 1.f);
+
+		auto eased = 1.f - easeOut(t);
+
+		auto& quad = m_quads.instances.at(i);
+		quad.transform.position += seg.velocity * eased * dt.count();
+		if (worldSpace::isOutOfBounds(worldSpace::worldToGrid(quad.transform.position))) {
+			seg.velocity = -seg.velocity;
+		}
+
+		auto angle = dt.count() * eased * seg.rotSpeed;
+		quad.transform.orientation.rotate(angle);
+
+		if (t > 0.8f) {
+			auto scale = 1.f;
+			auto u = (t - 0.8f) / 0.2f; // 0 → 1
+			scale = 1.f - u;			// 1 → 0
+			quad.transform.scale = {scale, scale};
+		}
+
+		if (t < 1.f) {
+			animating = true;
+		}
+	}
+	m_finished = !animating;
+}
+
+void DeathAnimation::draw(le::IRenderer& renderer) const {
+	m_quads.draw(renderer);
+}
+
+} // namespace chomper::animation

lib/src/animator.cpp

@@ -0,0 +1,22 @@
+#include "chomper/animator.hpp"
+
+namespace chomper {
+void Animator::play(std::unique_ptr<IAnimation> animation) {
+	m_playing.emplace_back(std::move(animation));
+}
+
+void Animator::tick(kvf::Seconds dt) {
+	std::erase_if(m_playing, [&](auto const& animation) {
+		return animation->finished();
+	});
+	for (auto const& animation : m_playing) {
+		animation->tick(dt);
+	}
+}
+
+void Animator::draw(le::IRenderer& renderer) const {
+	for (auto const& animation : m_playing) {
+		animation->draw(renderer);
+	}
+}
+} // namespace chomper

lib/src/player.cpp

@@ -1,4 +1,5 @@
 #include "chomper/player.hpp"
+#include "chomper/animations/deathAnimation.hpp"
 #include "chomper/controllers/player_controller.hpp"
 #include "chomper/engine.hpp"
 #include "chomper/world_size.hpp"
@@ -18,12 +19,13 @@ Player::Player(le::input::ScopedActionMapping& mapping, gsl::not_null<Engine con
 }
 
 void Player::tick(kvf::Seconds dt) {
+	m_animator.tick(dt);
+
 	if (!m_info.alive) {
 		return;
 	}
 
 	m_controller->tick(dt);
-
 	m_moveTimer += dt;
 
 	if (m_moveTimer >= moveSpeed_v) {
@@ -69,6 +71,7 @@ void Player::move() {
 	if (isCollidingWithSelf(targetGrid) || isCollidingWithWall(targetGrid)) {
 		if (m_graceMove) {
 			m_info.alive = false;
+			m_animator.play(std::make_unique<animation::DeathAnimation>(m_snake.getSegments()));
 		} else {
 			m_graceMove = true;
 		}
@@ -96,7 +99,10 @@ void Player::updateScoreText() {
 }
 
 void Player::draw(le::IRenderer& renderer) const {
-	m_snake.draw(renderer);
+	if (m_info.alive) {
+		m_snake.draw(renderer);
+	}
+	m_animator.draw(renderer);
 	m_scoreText.draw(renderer);
 }
 

lib/src/runtimes/game.cpp

@@ -40,7 +40,15 @@ void Game::tick(kvf::Seconds const dt) {
 
 	// On death
 	if (!m_player->getInfo().alive) {
-		m_engine->setNextRuntime<runtime::Entrypoint>();
+		auto const visitor = klib::SubVisitor{[this](le::event::Key const& key) {
+			if (key.action != GLFW_PRESS) {
+				return;
+			}
+			m_engine->setNextRuntime<Entrypoint>();
+		}};
+		for (auto const& event : m_engine->getContext().event_queue()) {
+			std::visit(visitor, event);
+		}
 	}
 }