raylib-src/examples/textures/textures_srcrec_dstrec.c

/*******************************************************************************************
*
*   raylib [textures] example - Texture source and destination rectangles
*
*   This example has been created using raylib 1.3 (www.raylib.com)
*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
*   Copyright (c) 2015 Ramon Santamaria (@raysan5)
*
********************************************************************************************/

#include "raylib.h"

int main(void)
{
    // Initialization
    //--------------------------------------------------------------------------------------
    const int screenWidth = 800;
    const int screenHeight = 450;

    InitWindow(screenWidth, screenHeight, "raylib [textures] examples - texture source and destination rectangles");

    // NOTE: Textures MUST be loaded after Window initialization (OpenGL context is required)
    
    Texture2D scarfy = LoadTexture("resources/scarfy.png");        // Texture loading

    int frameWidth = scarfy.width/6;
    int frameHeight = scarfy.height;

    // Source rectangle (part of the texture to use for drawing)
    Rectangle sourceRec = { 0.0f, 0.0f, frameWidth, frameHeight };

    // Destination rectangle (screen rectangle where drawing part of texture)
    Rectangle destRec = { screenWidth/2, screenHeight/2, frameWidth*2, frameHeight*2 };

    // Origin of the texture (rotation/scale point), it's relative to destination rectangle size
    Vector2 origin = { frameWidth, frameHeight };

    int rotation = 0;

    SetTargetFPS(60);
    //--------------------------------------------------------------------------------------

    // Main game loop
    while (!WindowShouldClose())    // Detect window close button or ESC key
    {
        // Update
        //----------------------------------------------------------------------------------
        rotation++;
        //----------------------------------------------------------------------------------

        // Draw
        //----------------------------------------------------------------------------------
        BeginDrawing();

            ClearBackground(RAYWHITE);

            // NOTE: Using DrawTexturePro() we can easily rotate and scale the part of the texture we draw
            // sourceRec defines the part of the texture we use for drawing
            // destRec defines the rectangle where our texture part will fit (scaling it to fit)
            // origin defines the point of the texture used as reference for rotation and scaling
            // rotation defines the texture rotation (using origin as rotation point)
            DrawTexturePro(scarfy, sourceRec, destRec, origin, (float)rotation, WHITE);

            DrawLine((int)destRec.x, 0, (int)destRec.x, screenHeight, GRAY);
            DrawLine(0, (int)destRec.y, screenWidth, (int)destRec.y, GRAY);

            DrawText("(c) Scarfy sprite by Eiden Marsal", screenWidth - 200, screenHeight - 20, 10, GRAY);

        EndDrawing();
        //----------------------------------------------------------------------------------
    }

    // De-Initialization
    //--------------------------------------------------------------------------------------
    UnloadTexture(scarfy);        // Texture unloading

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

    return 0;
}