new example: textures_background_scrolling

examples/textures/textures_background_scrolling.c

@@ -0,0 +1,87 @@
+/*******************************************************************************************
+*
+*   raylib [textures] example - Background scrolling
+*
+*   This example has been created using raylib 2.0 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2019 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+int main()
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    int screenWidth = 800;
+    int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [textures] example - background scrolling");
+    
+    // NOTE: Be careful, background width must be equal or bigger than screen width
+    // if not, texture should be draw more than two times for scrolling effect
+    Texture2D background = LoadTexture("resources/cyberpunk_street_background.png");
+    Texture2D midground = LoadTexture("resources/cyberpunk_street_midground.png");
+    Texture2D foreground = LoadTexture("resources/cyberpunk_street_foreground.png");
+    
+    float scrollingBack = 0;
+    float scrollingMid = 0;
+    float scrollingFore = 0;
+    
+    SetTargetFPS(60);
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        scrollingBack -= 0.1f;
+        scrollingMid -= 0.5f;
+        scrollingFore -= 1.0f;
+        
+        // NOTE: Texture is scaled twice its size, so it sould be considered on scrolling
+        if (scrollingBack <= -background.width*2) scrollingBack = 0;
+        if (scrollingMid <= -midground.width*2) scrollingMid = 0;
+        if (scrollingFore <= -foreground.width*2) scrollingFore = 0;
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(GetColor(0x052c46ff));
+
+            // Draw background image twice
+            // NOTE: Texture is scaled twice its size
+            DrawTextureEx(background, (Vector2){ scrollingBack, 20 }, 0.0f, 2.0f, WHITE);
+            DrawTextureEx(background, (Vector2){ background.width*2 + scrollingBack, 20 }, 0.0f, 2.0f, WHITE);
+            
+            // Draw midground image twice
+            DrawTextureEx(midground, (Vector2){ scrollingMid, 20 }, 0.0f, 2.0f, WHITE);
+            DrawTextureEx(midground, (Vector2){ midground.width*2 + scrollingMid, 20 }, 0.0f, 2.0f, WHITE);
+            
+            // Draw foreground image twice
+            DrawTextureEx(foreground, (Vector2){ scrollingFore, 70 }, 0.0f, 2.0f, WHITE);
+            DrawTextureEx(foreground, (Vector2){ foreground.width*2 + scrollingFore, 70 }, 0.0f, 2.0f, WHITE);
+            
+            DrawText("BACKGROUND SCROLLING & PARALLAX", 10, 10, 20, RED);
+            DrawText("(c) Cyberpunk Street Environment by Luis Zuno (@ansimuz)", screenWidth - 330, screenHeight - 20, 10, RAYWHITE);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    UnloadTexture(background);  // Unload background texture
+    UnloadTexture(midground);   // Unload midground texture
+    UnloadTexture(foreground);  // Unload foreground texture
+
+    CloseWindow();              // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}