raylib-src/examples/textures/textures_rectangle.c

/*******************************************************************************************
*
*   raylib [textures] example - Texture loading and drawing a part defined by a rectangle
*
*   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) 2014 Ramon Santamaria (@raysan5)
*
********************************************************************************************/

#include "raylib.h"

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

    InitWindow(screenWidth, screenHeight, "raylib [texture] example - texture rectangle");

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

    Vector2 position = { 350.0f, 240.0f };
    Rectangle frameRec = { 0, 0, guybrush.width/7, guybrush.height };
    int currentFrame = 0;
    //--------------------------------------------------------------------------------------

    // Main game loop
    while (!WindowShouldClose())    // Detect window close button or ESC key
    {
        // Update
        //----------------------------------------------------------------------------------
        if (IsKeyPressed(KEY_RIGHT))
        {
            currentFrame++;
            
            if (currentFrame > 6) currentFrame = 0;
            
            frameRec.x = currentFrame*guybrush.width/7;
        }
        //----------------------------------------------------------------------------------

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

            ClearBackground(RAYWHITE);

            DrawTexture(guybrush, 35, 40, WHITE);
            DrawRectangleLines(35, 40, guybrush.width, guybrush.height, LIME);
            
            DrawTextureRec(guybrush, frameRec, position, WHITE);  // Draw part of the texture
            
            DrawRectangleLines(35 + frameRec.x, 40 + frameRec.y, frameRec.width, frameRec.height, RED);
            
            DrawText("PRESS RIGHT KEY to", 540, 310, 10, GRAY);
            DrawText("CHANGE DRAWING RECTANGLE", 520, 330, 10, GRAY);
            
            DrawText("Guybrush Ulysses Threepwood,", 100, 300, 10, GRAY);
            DrawText("main character of the Monkey Island series", 80, 320, 10, GRAY);
            DrawText("of computer adventure games by LucasArts.", 80, 340, 10, GRAY);

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

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

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

    return 0;
}