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Virtual mouse with window letterbox, and Clamp
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Anata 2020-03-24 14:25:44 +01:00 committed by GitHub
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/*******************************************************************************************
*
* 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;
}