Add files via upload (#1147)

Virtual mouse with window letterbox, and Clamp

1 files changed, 115 insertions, 0 deletions

diff --git a/examples/core/core_window_letterbox_virtual_mouse.c b/examples/core/core_window_letterbox_virtual_mouse.c
new file mode 100644
index 00000000..87280cdd
--- /dev/null
+++ b/examples/core/core_window_letterbox_virtual_mouse.c
@@ -0,0 +1,115 @@
+/*******************************************************************************************

+*

+*   raylib [core] example - window scale letterbox virtual mouse

+*

+*   This example has been created using raylib 2.5 (www.raylib.com)

+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)

+*

+*   Example contributed by Anata (@anatagawa) and reviewed by Ramon Santamaria (@raysan5)

+*

+*   Copyright (c) 2019 Anata (@anatagawa) and Ramon Santamaria (@raysan5)

+*

+********************************************************************************************/

+

+#include "raylib.h"

+

+#define max(a, b) ((a)>(b)? (a) : (b))

+#define min(a, b) ((a)<(b)? (a) : (b))

+

+/**

+ * Clamp Vector2 value with min and max and return a new vector2

+ */

+Vector2 Clamp( Vector2 value, Vector2 min, Vector2 max ) {

+    Vector2 result = value;

+    result.x = ( result.x > max.x ) ? max.x : result.x;

+    result.x = ( result.x < min.x ) ? min.x : result.x;

+    result.y = ( result.y > max.y ) ? max.y : result.y;

+    result.y = ( result.y < min.y ) ? min.y : result.y;

+    return result;

+}

+

+int main(void)

+{

+    const int windowWidth = 800;

+    const int windowHeight = 450;

+

+    // Enable config flags for resizable window and vertical synchro

+    SetConfigFlags(FLAG_WINDOW_RESIZABLE | FLAG_VSYNC_HINT);

+    InitWindow(windowWidth, windowHeight, "raylib [core] example - window scale letterbox");

+    SetWindowMinSize(320, 240);

+

+    int gameScreenWidth = 640;

+    int gameScreenHeight = 480;

+

+    // Render texture initialization, used to hold the rendering result so we can easily resize it

+    RenderTexture2D target = LoadRenderTexture(gameScreenWidth, gameScreenHeight);

+    SetTextureFilter(target.texture, FILTER_BILINEAR);  // Texture scale filter to use

+

+    Color colors[10] = { 0 };

+    for (int i = 0; i < 10; i++) colors[i] = (Color){ GetRandomValue(100, 250), GetRandomValue(50, 150), GetRandomValue(10, 100), 255 };

+

+    SetTargetFPS(60);               // Set our game to run at 60 frames-per-second

+    //--------------------------------------------------------------------------------------

+

+    // Main game loop

+    while (!WindowShouldClose())    // Detect window close button or ESC key

+    {

+        // Update

+        //----------------------------------------------------------------------------------

+        // Compute required framebuffer scaling

+        float scale = min((float)GetScreenWidth()/gameScreenWidth, (float)GetScreenHeight()/gameScreenHeight);

+

+        // Update virtual mouse

+        //----------------------------------------------------------------------------------

+        Vector2 mouse = GetMousePosition();

+

+        mouse.x = (mouse.x - ( GetScreenWidth () - ( gameScreenWidth * scale) ) * 0.5) / scale;

+        mouse.y = (mouse.y - ( GetScreenHeight () - ( gameScreenHeight * scale) ) * 0.5) / scale;

+

+        // Clamp mouse value behind gamescreen

+        mouse = Clamp( mouse, (Vector2){0,0}, (Vector2) { gameScreenWidth, gameScreenHeight } );

+

+        //----------------------------------------------------------------------------------

+

+        if (IsKeyPressed(KEY_SPACE))

+        {

+            // Recalculate random colors for the bars

+            for (int i = 0; i < 10; i++) colors[i] = (Color){ GetRandomValue(100, 250), GetRandomValue(50, 150), GetRandomValue(10, 100), 255 };

+        }

+        //----------------------------------------------------------------------------------

+

+        // Draw

+        //----------------------------------------------------------------------------------

+        BeginDrawing();

+            ClearBackground(BLACK);

+

+            // Draw everything in the render texture, note this will not be rendered on screen, yet

+            BeginTextureMode(target);

+

+                ClearBackground(RAYWHITE);         // Clear render texture background color

+

+                for (int i = 0; i < 10; i++) DrawRectangle(0, (gameScreenHeight/10)*i, gameScreenWidth, gameScreenHeight/10, colors[i]);

+

+                DrawText("If executed inside a window,\nyou can resize the window,\nand see the screen scaling!", 10, 25, 20, WHITE);

+                DrawText( TextFormat("Virtual Mouse : %.0f , %.0f", mouse.x, mouse.y), 350, 25, 20, YELLOW);

+

+            EndTextureMode();

+

+            // Draw RenderTexture2D to window, properly scaled

+            DrawTexturePro(target.texture, (Rectangle){ 0.0f, 0.0f, (float)target.texture.width, (float)-target.texture.height },

+                           (Rectangle){ (GetScreenWidth() - ((float)gameScreenWidth*scale))*0.5, (GetScreenHeight() - ((float)gameScreenHeight*scale))*0.5,

+                           (float)gameScreenWidth*scale, (float)gameScreenHeight*scale }, (Vector2){ 0, 0 }, 0.0f, WHITE);

+

+        EndDrawing();

+        //--------------------------------------------------------------------------------------

+    }

+

+    // De-Initialization

+    //--------------------------------------------------------------------------------------

+    UnloadRenderTexture(target);    // Unload render texture

+

+    CloseWindow();                  // Close window and OpenGL context

+    //--------------------------------------------------------------------------------------

+

+    return 0;

+}