From b412c992ee4fefe9e38e9e8f3a6c0960558b9dff Mon Sep 17 00:00:00 2001
From: brxxh <11dac2t@huhn-online.de>
Date: Fri, 30 May 2025 20:10:19 +0200
Subject: [PATCH] Make the game go faster after some time

---
 examples/tappyplane/tappyplane.cpp | 51 ++++++++++++++++++++++--------
 1 file changed, 38 insertions(+), 13 deletions(-)

diff --git a/examples/tappyplane/tappyplane.cpp b/examples/tappyplane/tappyplane.cpp
index 4575f67..6e90794 100644
--- a/examples/tappyplane/tappyplane.cpp
+++ b/examples/tappyplane/tappyplane.cpp
@@ -22,11 +22,15 @@
 #include <iostream>
 
 static const unsigned int FRAME_RATE = 60;
+
 static const unsigned int WINDOW_WIDTH = 800;
 static const unsigned int WINDOW_HEIGHT = 480;
 static const unsigned int WINDOW_SCALE = 2;
+
 static const char ACTION_KEY = ' ';
 
+static constexpr float SCROLLING_SPEED_INC_FACTOR = 1.0002f;
+
 // x,y+h --- x+w,y+h
 //   |          |
 //   |          |
@@ -45,7 +49,9 @@ struct AABB {
 };
 
 struct Background {
-    static constexpr float SCROLLING_SPEED = 0.003f;
+    static constexpr float INIT_SCROLLING_SPEED = 0.003f;
+
+    float scrolling_speed = INIT_SCROLLING_SPEED;
 
     std::array<paradiso::Sprite, 2> sprites;
     paradiso::Renderer renderer{};
@@ -54,6 +60,9 @@ struct Background {
         paradiso::BitmapIO::get().load("PNG/background.png");
 
     void init() {
+        // For resetting.
+        scrolling_speed = INIT_SCROLLING_SPEED;
+
         sprites = {paradiso::Sprite{
                        .bitmap = image,
                        .pivot = {paradiso::Vector2<float>::make(0.0f, 0.0f)},
@@ -66,7 +75,7 @@ struct Background {
 
     void update() {
         for (auto& sprite : sprites) {
-            sprite.pivot.x() -= SCROLLING_SPEED;
+            sprite.pivot.x() -= scrolling_speed;
             if (sprite.pivot.x() <= -2.0f) {
                 sprite.pivot.x() += 4.0f;
             }
@@ -84,7 +93,9 @@ struct Background {
 };
 
 struct Ground {
-    static constexpr float SCROLLING_SPEED = 0.009f;
+    static constexpr float INIT_SCROLLING_SPEED = 0.009f;
+
+    float scrolling_speed = INIT_SCROLLING_SPEED;
 
     std::array<paradiso::Sprite, 2> sprites;
     paradiso::Renderer renderer{};
@@ -97,6 +108,9 @@ struct Ground {
     AABB aabb{};
 
     void init() {
+        // For resetting.
+        scrolling_speed = INIT_SCROLLING_SPEED;
+
         // The image's height is 71 px.
         float scale_y = 71.0f / WINDOW_HEIGHT;
 
@@ -120,7 +134,7 @@ struct Ground {
 
     void update() {
         for (auto& sprite : sprites) {
-            sprite.pivot.x() -= SCROLLING_SPEED;
+            sprite.pivot.x() -= scrolling_speed;
             if (sprite.pivot.x() <= -2.0f) {
                 sprite.pivot.x() += 4.0f;
             }
@@ -138,9 +152,11 @@ struct Ground {
 };
 
 struct Rocks {
-    static constexpr float SCROLLING_SPEED = 0.006f;
+    static constexpr float INIT_SCROLLING_SPEED = 0.006f;
     static constexpr float GAP_SIZE = 1.6f;
 
+    float scrolling_speed = INIT_SCROLLING_SPEED;
+
     paradiso::Sprite top_sprite;
     paradiso::Sprite bottom_sprite;
 
@@ -157,7 +173,11 @@ struct Rocks {
     AABB top_aabb;
     AABB bottom_aabb;
 
-    void init(float x) {
+    void init(float x, bool reset_scrolling_speed = false) {
+        if (reset_scrolling_speed) {
+            scrolling_speed = INIT_SCROLLING_SPEED;
+        }
+
         // The image's size is 108x239 px.
         float scale_x = 108.0f / WINDOW_WIDTH;
         float scale_y = 239.0f / WINDOW_HEIGHT;
@@ -198,8 +218,8 @@ struct Rocks {
     }
 
     void update() {
-        top_sprite.pivot.x() -= SCROLLING_SPEED;
-        bottom_sprite.pivot.x() -= SCROLLING_SPEED;
+        top_sprite.pivot.x() -= scrolling_speed;
+        bottom_sprite.pivot.x() -= scrolling_speed;
 
         // +----------+
         // |          |
@@ -290,7 +310,7 @@ struct Plane {
                              .scale = scale},
         };
 
-        // For reseting.
+        // For resetting.
         position_y = INIT_POSITION_Y;
         velocity_y = INIT_VELOCITY_Y;
         rotation = INIT_ROTATION;
@@ -528,8 +548,8 @@ auto main() -> int {
 
     background.init();
     ground.init();
-    rocks1.init(1.2f);
-    rocks2.init(2.4f);
+    rocks1.init(1.2f, true); // We don't need to set this to true,
+    rocks2.init(2.4f, true); // but why not?
     plane.init();
     start_text.init();
     game_over_text.init();
@@ -571,6 +591,11 @@ auto main() -> int {
 
             plane.update(window.keyboard_input());
 
+            background.scrolling_speed *= SCROLLING_SPEED_INC_FACTOR;
+            ground.scrolling_speed *= SCROLLING_SPEED_INC_FACTOR;
+            rocks1.scrolling_speed *= SCROLLING_SPEED_INC_FACTOR;
+            rocks2.scrolling_speed *= SCROLLING_SPEED_INC_FACTOR;
+
             if (plane.aabb.is_colliding_with(rocks1.top_aabb) ||
                 plane.aabb.is_colliding_with(rocks1.bottom_aabb) ||
                 plane.aabb.is_colliding_with(rocks2.top_aabb) ||
@@ -586,8 +611,8 @@ auto main() -> int {
                 // Reset everything.
                 background.init();
                 ground.init();
-                rocks1.init(1.2f);
-                rocks2.init(2.4f);
+                rocks1.init(1.2f, true);
+                rocks2.init(2.4f, true);
                 plane.init();
                 game_state = GameState::Start;
             }