From 85119293fe4f6814d44e8ee3f182c40876829128 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Sun, 17 Apr 2022 14:03:10 +0200
Subject: Added sample bullet and some generation

---
 Bullets.cpp    | 21 +++++++++++++++++++++
 Bullets.h      | 18 ++++++++++++++++++
 CMakeLists.txt |  1 +
 GameScreen.cpp | 37 +++++++++++++++++++++++++++++++++++--
 GameScreen.h   |  4 ++++
 5 files changed, 79 insertions(+), 2 deletions(-)
 create mode 100644 Bullets.cpp
 create mode 100644 Bullets.h

diff --git a/Bullets.cpp b/Bullets.cpp
new file mode 100644
index 0000000..312e12e
--- /dev/null
+++ b/Bullets.cpp
@@ -0,0 +1,21 @@
+#include "Bullets.h"
+
+#include <vector>
+
+#include <raylib.h>
+
+
+void
+update(const float dt, std::vector<ConstantVelocityBullet>& bullets)
+{
+    auto it = bullets.begin();
+    while (it != bullets.end()) {
+        auto& bullet = *it;
+        bullet.position.x += bullet.velocity.x * dt;
+        bullet.position.y += bullet.velocity.y * dt;
+        if (bullet.position.y > 800)
+            it = bullets.erase(it);
+        else
+            ++it;
+    }
+}
diff --git a/Bullets.h b/Bullets.h
new file mode 100644
index 0000000..7778a9c
--- /dev/null
+++ b/Bullets.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#include <vector>
+
+#include <raylib.h>
+
+
+struct ConstantVelocityBullet;
+
+
+void update(float dt, std::vector<ConstantVelocityBullet>& bullets);
+
+
+struct ConstantVelocityBullet
+{
+    Vector2 position;
+    Vector2 velocity;
+};
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3ae25bd..e550575 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,6 +11,7 @@ endif()
 find_package(raylib 3 REQUIRED)
 add_executable(
     ${PROJECT_NAME}
+    Bullets.cpp
     Game.cpp
     GameScreen.cpp
     main.cpp
diff --git a/GameScreen.cpp b/GameScreen.cpp
index 714ccf5..dcae176 100644
--- a/GameScreen.cpp
+++ b/GameScreen.cpp
@@ -1,11 +1,16 @@
 #include "GameScreen.h"
 
+#include <cmath>
+
 #include <raylib.h>
 
+#include "Bullets.h"
+
 
 GameScreen::GameScreen() :
     m_pos {400, 300}
 {
+    m_const_bullets.reserve(10000);
 }
 
 
@@ -13,9 +18,33 @@ void
 GameScreen::update(const float dt)
 {
     if (IsKeyDown(KEY_LEFT))
-        m_pos.x -= dt * 30;
+        m_pos.x -= dt * 80;
     if (IsKeyDown(KEY_RIGHT))
-        m_pos.x += dt * 30;
+        m_pos.x += dt * 80;
+    m_delay += dt;
+    if (m_delay > TEST_INTERVAL) {
+        m_delay -= TEST_INTERVAL;
+        const int speed = 120;
+        const int divisions = 17;
+        for (double i = 0; i <= divisions; ++i) {
+            const double angle = (0.1 + 0.8 * i / divisions) * M_PI;
+            const double cos = std::cos(angle);
+            const double sin = std::sin(angle);
+            ConstantVelocityBullet bullet;
+            bullet.position.x = 400;
+            bullet.position.y = 20;
+            bullet.velocity.x = cos * speed;
+            bullet.velocity.y = sin * speed;
+            m_const_bullets.push_back(std::move(bullet));
+        }
+    }
+    ::update(dt, m_const_bullets);
+    bool collided = false;
+    for (const auto& bullet : m_const_bullets) {
+        if (CheckCollisionCircles(m_pos, 10, bullet.position, 6))
+            collided = true;
+    }
+    (void) collided;
 }
 
 
@@ -23,4 +52,8 @@ void
 GameScreen::draw()
 {
     DrawCircle(m_pos.x, m_pos.y, 10, LIGHTGRAY);
+    for (const auto& bullet : m_const_bullets)
+        DrawCircle(bullet.position.x, bullet.position.y, 6, RED);
+    DrawFPS(5, 5);
+    DrawText(TextFormat("%d", m_const_bullets.size()), 5, 25, 20, DARKGRAY);
 }
diff --git a/GameScreen.h b/GameScreen.h
index 47a80d1..3555a6f 100644
--- a/GameScreen.h
+++ b/GameScreen.h
@@ -2,6 +2,7 @@
 
 #include <raylib.h>
 
+#include "Bullets.h"
 #include "Screen.h"
 
 
@@ -12,5 +13,8 @@ public:
     void update(float dt) override;
     void draw() override;
 private:
+    static constexpr float TEST_INTERVAL {0.24f};
+    float m_delay;
     Vector2 m_pos;
+    std::vector<ConstantVelocityBullet> m_const_bullets;
 };
-- 
cgit v1.1