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"

#define MAX_FRAME_SPEED     15
#define MIN_FRAME_SPEED      1

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

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

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

    Vector2 position = { 350.0f, 280.0f };
    Rectangle frameRec = { 0.0f, 0.0f, (float)scarfy.width/6, (float)scarfy.height };
    int currentFrame = 0;

    int framesCounter = 0;
    int framesSpeed = 8;            // Number of spritesheet frames shown by second

    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
        //----------------------------------------------------------------------------------
        framesCounter++;

        if (framesCounter >= (60/framesSpeed))
        {
            framesCounter = 0;
            currentFrame++;

            if (currentFrame > 5) currentFrame = 0;

            frameRec.x = (float)currentFrame*(float)scarfy.width/6;
        }

        if (IsKeyPressed(KEY_RIGHT)) framesSpeed++;
        else if (IsKeyPressed(KEY_LEFT)) framesSpeed--;

        if (framesSpeed > MAX_FRAME_SPEED) framesSpeed = MAX_FRAME_SPEED;
        else if (framesSpeed < MIN_FRAME_SPEED) framesSpeed = MIN_FRAME_SPEED;
        //----------------------------------------------------------------------------------

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

            ClearBackground(RAYWHITE);

            DrawTexture(scarfy, 15, 40, WHITE);
            DrawRectangleLines(15, 40, scarfy.width, scarfy.height, LIME);
            DrawRectangleLines(15 + frameRec.x, 40 + frameRec.y, frameRec.width, frameRec.height, RED);

            DrawText("FRAME SPEED: ", 165, 210, 10, DARKGRAY);
            DrawText(FormatText("%02i FPS", framesSpeed), 575, 210, 10, DARKGRAY);
            DrawText("PRESS RIGHT/LEFT KEYS to CHANGE SPEED!", 290, 240, 10, DARKGRAY);

            for (int i = 0; i < MAX_FRAME_SPEED; i++)
            {
                if (i < framesSpeed) DrawRectangle(250 + 21*i, 205, 20, 20, RED);
                DrawRectangleLines(250 + 21*i, 205, 20, 20, MAROON);
            }

            DrawTextureRec(scarfy, frameRec, position, WHITE);  // Draw part of the texture

            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;
}