From 0e091a856d4bf10bb95424578c5051bb32fb0e30 Mon Sep 17 00:00:00 2001
From: sigonasr2 <sigonasr2@gmail.com>
Date: Thu, 13 Apr 2023 02:21:41 -0500
Subject: [PATCH] Enemies melt when killed.

---
 Faceball2030/main.cpp | 80 ++++++++++++++++++++++++++++++++++++++-----
 Faceball2030/main.h   |  7 ++++
 2 files changed, 79 insertions(+), 8 deletions(-)

diff --git a/Faceball2030/main.cpp b/Faceball2030/main.cpp
index 98aa7b3..cc7d992 100644
--- a/Faceball2030/main.cpp
+++ b/Faceball2030/main.cpp
@@ -31,6 +31,26 @@ bool Enemy::isDead() {
 	return health <= 0;
 }
 
+void Enemy::increaseDeathTimer(float fElapsedTime) {
+	deathTimer += fElapsedTime;
+}
+
+bool Enemy::deathAnimationOver() {
+	return deathTimer > 3.0f;
+}
+
+void Enemy::increaseColorFactor(float fElapsedTime) {
+	colorFactor += 50 * fElapsedTime;
+}
+
+float Enemy::getColorFactor() {
+	return colorFactor;
+}
+
+void Enemy::decreaseColorFactor() {
+	colorFactor--;
+}
+
 void FaceBall::InitializeEnemyData() {
 	enemyData[EnemyID::NONE] = { "VOID",undefined,BLACK };
 	enemyData[EXIT] = { "EXIT",undefined,GREEN };
@@ -915,11 +935,10 @@ bool Bullet::Update(float fElapsedTime) {
 		int collided_enemy = FaceBall::CheckEnemyCollision(adjustedSpd, { pos.x,pos.z }, 0.1);
 		if (collided_enemy!=-1) {
 			Enemy& enemy = game->enemies[collided_enemy];
-			enemy.Hurt();
-			if (enemy.isDead()) {
-				game->enemies.erase(game->enemies.begin() + collided_enemy);
+			if (!enemy.isDead()) {
+				enemy.Hurt();
+				return false;
 			}
-			return false;
 		}
 	}
 	if (!FaceBall::CheckCollision(adjustedSpd, {pos.x,pos.z}, 0.05)) {
@@ -933,10 +952,55 @@ bool Bullet::Update(float fElapsedTime) {
 }
 
 void FaceBall::RunEnemyAI(Enemy& e,float fElapsedTime) {
-	switch (e.GetID()) {
-		case SHOOTME: {
-			e.rot += 0.5 * fElapsedTime;
-		}break;
+	if (e.isDead()) {
+		if (!e.deathAnimationOver()) {
+			std::vector<Triangle>& tris = e.mesh.tris;
+			uint8_t darkenAmt = 0;
+			while (e.getColorFactor() >= 1) {
+				darkenAmt++;
+				e.decreaseColorFactor();
+			}
+			for (Triangle& t : tris) {
+				if (t.p[0].y > 0.1) {
+					t.p[0].y = std::max(0.1f, t.p[0].y - 0.3f * fElapsedTime);
+				}
+				else {
+					float dir = std::atan2f(t.p[0].z, t.p[0].x);
+					t.p[0].x += std::cosf(dir)*0.04f*fElapsedTime;
+					t.p[0].z += std::sinf(dir) * 0.04f * fElapsedTime;
+				}
+				if (t.p[1].y > 0.1) {
+					t.p[1].y = std::max(0.1f, t.p[1].y - 0.3f * fElapsedTime);
+				}
+				else {
+					float dir = std::atan2f(t.p[1].z, t.p[1].x);
+					t.p[1].x += std::cosf(dir) * 0.06f * fElapsedTime;
+					t.p[1].z += std::sinf(dir) * 0.06f * fElapsedTime;
+				}
+				if (t.p[2].y > 0.1) {
+					t.p[2].y = std::max(0.1f, t.p[2].y - 0.3f * fElapsedTime);
+				}
+				else {
+					float dir = std::atan2f(t.p[2].z, t.p[2].x);
+					t.p[2].x += std::cosf(dir) * 0.05f * fElapsedTime;
+					t.p[2].z += std::sinf(dir) * 0.05f * fElapsedTime;
+				}
+				if (darkenAmt>0){
+					t.col[0] -= {darkenAmt, darkenAmt, darkenAmt};
+					t.col[1] -= {darkenAmt, darkenAmt, darkenAmt};
+					t.col[2] -= {darkenAmt, darkenAmt, darkenAmt};
+				}
+			}
+			e.increaseDeathTimer(fElapsedTime);
+			e.increaseColorFactor(fElapsedTime);
+		}
+	}
+	else {
+		switch (e.GetID()) {
+			case SHOOTME: {
+				e.rot += 0.5 * fElapsedTime;
+			}break;
+		}
 	}
 }
 
diff --git a/Faceball2030/main.h b/Faceball2030/main.h
index 3e919e1..abb6bcd 100644
--- a/Faceball2030/main.h
+++ b/Faceball2030/main.h
@@ -175,11 +175,18 @@ struct Enemy : Object {
 		int health=1;
 		std::vector<float> shots;
 		float fireDelay=0;
+		float deathTimer=0;
+		float colorFactor = 0;
 	public:
 		Enemy(EnemyID id, vec3d pos, float rot, float radius);
 		EnemyID GetID();
 		void Hurt();
 		bool isDead();
+		void increaseDeathTimer(float fElapsedTime);
+		bool deathAnimationOver();
+		void increaseColorFactor(float fElapsedTime);
+		float getColorFactor();
+		void decreaseColorFactor();
 };
 
 class FaceBall : public PixelGameEngine