/robowaifu/ - C++ Learning Classroom

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C++ Learning Classroom Chobitsu Board owner 02/11/2023 (Sat) 02:56:07 No.19777

Keep your eyes on the prize edition • 230603 lecture; week-five (>>22899) - this week's reading assignments: PPP2 chs 08 & 09 - reading review: PPP2 ch 07 - reading preview: PPP2 ch 10 - this week's assignments () --- • This is our classroom's textbook thread: (>>18749) - you'll find a link in the OP to an archive of all the code examples therein, for your local study • This course material is primarily derived from Bjarne Stroustrup's college freshman textbook Programming -- Principles and Practice Using C++ https://www.stroustrup.com/programming.html - please obtain a copy of the book for yourself, you'll need it to complete this course successfully --- >note: if you see the thread pinned, it (should) mean we're nearby to help, so ask away! --- • I'd like to get some feedback from the class participants about this C++ programming class. Specifically, I have a few questions and I seek ideas & advice from Anons how to approach these needs: - How to best run our classroom using (only) this IB? - How to give out exercises & assignments, & receive solutions? - How to assign grades? - How to manage the asynchronous nature of IB communications, student-to-instructor (and vice versa)? - How to utilize the textbook thread well, since it (mostly) contains already-worked solutions? - How to do tests? - How to manage a final group project together? What should that project be in fact? - Any other adivce or suggestions you think would be helpful. Please post your recommendations for these topics ITT Anon, thanks! :^) --- >unless otherwise-noted, everything ITT is MIT (Expat) licensed >copyright 2023

Edited last time by Chobitsu on 06/02/2023 (Fri) 12:46:59.

Lec 04; chs 06 & 07 (8 of 14) Robowaifu Technician 05/27/2023 (Sat) 05:02:43 No.22796

>>22795 8

Lec 04; chs 06 & 07 (9 of 14) Robowaifu Technician 05/27/2023 (Sat) 05:04:19 No.22797

>>22796 9

Lec 04; chs 06 & 07 (10 of 14) Robowaifu Technician 05/27/2023 (Sat) 05:05:47 No.22798

>>22797 10

Lec 04; chs 06 & 07 (11 of 14) Robowaifu Technician 05/27/2023 (Sat) 05:07:25 No.22799

>>22798 11

Lec 04; chs 06 & 07 (12 of 14) Robowaifu Technician 05/27/2023 (Sat) 05:09:18 No.22800

>>22799 12

Lec 04; chs 06 & 07 (13 of 14) Robowaifu Technician 05/27/2023 (Sat) 05:10:43 No.22801

>>22800 13

Lec 04; chs 06 & 07 (14 of 14) Robowaifu Technician 05/27/2023 (Sat) 05:12:34 No.22802

>>22801 Lecture 04 ends 14

Assignments; Lec 04 Robowaifu Technician 05/27/2023 (Sat) 05:13:40 No.22803

>spare reserve

Robowaifu Technician 05/27/2023 (Sat) 05:14:30 No.22804

>spare reserve

Robowaifu Technician 05/27/2023 (Sat) 05:14:43 No.22805

>spare reserve

Robowaifu Technician 05/28/2023 (Sun) 02:53:59 No.22834

that's it? this is all the c++ you brainlets can write?

Chobitsu 05/28/2023 (Sun) 03:00:56 No.22835

>>22834 Lol, this is beginner's course Anon. :^)

Robowaifu Technician 05/28/2023 (Sun) 03:16:11 No.22837

>>22835 tHow about everyone here makes a text based game about a robot waifu starting now and they have to finish it by the end of the month.

Chobitsu 05/28/2023 (Sun) 03:30:01 No.22838

>>22837 Sounds like a good idea. I'll help you with it if that's what you want to do for a project Anon! :^)

Robowaifu Technician 06/01/2023 (Thu) 07:43:56 No.22879

>>22837 This guy speaks my language. You want to skill up to make a real-time, human-level AI some day? Drop the books and try making an 8-bit Waifugotchi first.

Chobitsu 06/01/2023 (Thu) 07:57:25 No.22880

>>22879 >8-bit Waifugotchi Sounds fun! :^) Same offer's extended to you Anon, I'll help out with C++ information if you want to do that as a project.

Robowaifu Technician 06/01/2023 (Thu) 08:24:44 No.22881

>>22880 honestly I need help with freqtrade, I want to make a trading bot and im kind of stuck... that's all python though. Or you can animate the whole spritesheet, but that one is just for fun https://github.com/peteblank/yotsubee

Chobitsu 06/01/2023 (Thu) 09:02:46 No.22882

>>22881 Haha I didn't say I'd do your work Anon, lol I have plenty of my own already! :^) But I'll honestly help you as I may if you get stuck with an honest effort. This is a classroom thread after all -- you're here to learn! Good luck with your work Anon.

Lec 05; chs 08 & 09 (1 of 13) Robowaifu Technician 06/02/2023 (Fri) 12:30:34 No.22899

Lecture 05 begins 1

Lec 05; chs 08 & 09 (2 of 13) Robowaifu Technician 06/02/2023 (Fri) 12:32:11 No.22900

>>22899 2

Lec 05; chs 08 & 09 (3 of 13) Robowaifu Technician 06/02/2023 (Fri) 12:33:13 No.22901

>>22900 3

Lec 05; chs 08 & 09 (4 of 13) Robowaifu Technician 06/02/2023 (Fri) 12:34:28 No.22902

>>22901 4

Lec 05; chs 08 & 09 (5 of 13) Robowaifu Technician 06/02/2023 (Fri) 12:35:38 No.22903

>>22902 5

Lec 05; chs 08 & 09 (6 of 13) Robowaifu Technician 06/02/2023 (Fri) 12:37:00 No.22904

>>22903 6

Lec 05; chs 08 & 09 (7 of 13) Robowaifu Technician 06/02/2023 (Fri) 12:38:24 No.22905

>>22904 7

Lec 05; chs 08 & 09 (8 of 13) Robowaifu Technician 06/02/2023 (Fri) 12:39:39 No.22906

>>22905 8

Lec 05; chs 08 & 09 (9 of 13) Robowaifu Technician 06/02/2023 (Fri) 12:40:42 No.22907

>>22906 9

Lec 05; chs 08 & 09 (10 of 13) Robowaifu Technician 06/02/2023 (Fri) 12:41:40 No.22908

>>22907 10

Lec 05; chs 08 & 09 (11 of 13) Robowaifu Technician 06/02/2023 (Fri) 12:42:38 No.22909

>>22908 11

Lec 05; chs 08 & 09 (12 of 13) Robowaifu Technician 06/02/2023 (Fri) 12:43:47 No.22910

>>22909 12

Lec 05; chs 08 & 09 (13 of 13) Robowaifu Technician 06/02/2023 (Fri) 12:44:45 No.22911

>>22910 Lecture 05 ends 13

Assignments; Lec 05 Robowaifu Technician 06/02/2023 (Fri) 12:45:09 No.22912

>spare reserve

Robowaifu Technician 06/02/2023 (Fri) 12:45:20 No.22913

>spare reserve

Robowaifu Technician 06/02/2023 (Fri) 12:45:36 No.22914

>spare reserve

Robowaifu Technician 06/02/2023 (Fri) 14:05:02 No.22917

>>22882 The honest effort is me animating the first row

Chobitsu 06/03/2023 (Sat) 01:22:36 No.22921

>>22917 Well, let's see what you've managed so far (the code please) and we'll come up with a plan for it.

Robowaifu Technician 06/04/2023 (Sun) 17:47:02 No.22949

>>22881

Robowaifu Technician 06/04/2023 (Sun) 17:50:22 No.22950

>>22921 I posted the github page

Chobitsu 06/05/2023 (Mon) 07:17:25 No.22955

>>22950 Oh, haha. Fair enough I suppose, thanks! But can you please just post the pertinent animation-related codeblock here ITT if you would Anon? That'll be much quicker for me, and is generally in line with the way to do things with our own textbook work. TIA. BTW, this page has information about using codeblocks correctly here. https://alogs.space/.static/pages/posting.html

Robowaifu Technician 06/05/2023 (Mon) 09:34:24 No.22957

>>22955 sure here it is


/*******************************************************************************************
*
*   raylib [textures] example - Sprite animation
*
*   Example originally created with raylib 1.3, last time updated with raylib 1.3
*
*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
*   BSD-like license that allows static linking with closed source software
*
*   Copyright (c) 2014-2023 Ramon Santamaria (@raysan5)
*
********************************************************************************************/

#include "../include/raylib.h"

#define MAX_FRAME_SPEED     15
#define MIN_FRAME_SPEED      1

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

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

    // NOTE: Textures MUST be loaded after Window initialization (OpenGL context is required)
    Texture2D scarfy = LoadTexture("src/assets/Yotsuba_SpriteSheet.png");        // Texture loading
/*
fixed the path
*/
    Vector2 position = { 350.0f, 280.0f };
    Rectangle frameRec = { (float)scarfy.width, 0.0f, (float)24, (float)scarfy.height/4 };
    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 > 2) currentFrame = 0;

            frameRec.x = (float)currentFrame*(float)scarfy.width/3; 	  	 
        }

        // Control frames speed
        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, 0, 40, WHITE);
            DrawRectangleLines(0, 40, scarfy.width, scarfy.height, LIME);
            DrawRectangleLines(6 + (int)frameRec.x, 40 + (int)frameRec.y, (int)frameRec.width, (int)frameRec.height, RED);

            DrawText("FRAME SPEED: ", 165, 210, 10, DARKGRAY);
            DrawText(TextFormat("%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;
}

Chobitsu 06/05/2023 (Mon) 09:38:59 No.22958

>>22957 Got it, thanks Anon. Here's my initial suggested fix:

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

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

    if (currentFrame > 2)
      currentFrame = 0;

    frameRec.x = (float)currentFrame * (float)scarfy.width / 3;

    // TODO: adjust your frameRec.y here?
  }

Please let us know if this modification helps.

Robowaifu Technician 06/05/2023 (Mon) 12:14:47 No.22959

>>22958 eh thank you ill try it later

Robowaifu Technician 06/05/2023 (Mon) 12:30:26 No.22962

>>22958 or even simpler


while (!WindowShouldClose()) 
{  
	currentFrame %= 3;
	frameRec.x = (float)currentFrame * (float)scarfy.width / 3;
	usleep( 1000000/framesSpeed );
}

Robowaifu Technician 06/05/2023 (Mon) 13:11:40 No.22964

>>22962 that's neat and all but it didn't solve the problem. But I did it. gg.


 while (!WindowShouldClose())    // Detect window close button or ESC key
    {
        // Update
        //----------------------------------------------------------------------------------
        framesCounter++;

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

            if (currentFrame > 2) 
            {currentFrame = 0;
            frameRec.y+=scarfy.height/4;
            if (frameRec.y >scarfy.height/4*3)
            {
                frameRec.y = 0;
            }
            }

             	  	 
	currentFrame %= 3;
	frameRec.x = (float)currentFrame * (float)scarfy.width / 3;

        }

Chobitsu 06/05/2023 (Mon) 16:14:58 No.22965

>>22962 Yep modulo is a good choice, but I'm unsure that the sleep will help much. Thanks Anon! >>22964 Great! Full marks Anon. Now, I'd suggest you enhance your system in two ways: 1. Replace this if/else pair with tests for '+' key (plus), and '-' key (minus), instead to control the rate of animation.

// Control frames speed
if (IsKeyPressed(KEY_RIGHT))
  framesSpeed++;
else if (IsKeyPressed(KEY_LEFT))
  framesSpeed--;

2. Now test all four direction keys, and this time use them to choose which row of your sprite sheet to animate (left, right, up, down) instead. Do these two steps and you'll be very close to an animated Yotsuba geimu character. Cheers. :^) >=== -prose edit

Edited last time by Chobitsu on 06/05/2023 (Mon) 16:20:36.

Robowaifu Technician 06/05/2023 (Mon) 16:36:09 No.22966

>>22965 >unsure that the sleep will help much because if (framesCounter >= (60 / framesSpeed)) makes no sense in a loop, framesCounter will be incremented as fast as the cpu can run its not time related the only way to do something in a timed interval is with the actual time functions not a counter, this only works because the library functions, which have proper timing/syncing, act as a bottleneck

Chobitsu 06/06/2023 (Tue) 02:47:22 No.22970

>>22966 I see your point Anon. At the least, the call while (! WindowShouldClose()) { ... } should allow the system to do polling for the rest of the work to be done outside the gameloop (user input, file/net I/O, etc). And the draw() call bookends likely serve a similar function around that block of code. >tl;dr The Raylib library is already allowing for a responsive system. IMO, intentionally injecting a wait is probably unhelpful in general in a game (outside an intentional 'pause' system).

Chobitsu 06/07/2023 (Wed) 12:28:48 No.22987

>>22964 >>22965 BTW, when you need to handle a lot of things that are similar, it's a more-typical (good) practice to do so inside a switch() statement. Here's my recommendation to you how to do so, just to get you pointed in the right direction Anon: >main.cpp snippet:

switch (GetKeyPressed()) {
  case KEY_KP_ADD: {
    framesSpeed++;
    if (framesSpeed > max_frame_speed)
      framesSpeed = max_frame_speed;
    break;
  }
  case KEY_KP_SUBTRACT: {
    framesSpeed--;
    if (framesSpeed < min_frame_speed)
      framesSpeed = min_frame_speed;
    break;
  }

    // TODO: add your directional key handler code statements here...

  default:;  // nop (for now)
}

You can find the enumeration of all the available keypress definitions in the include/raylib.h file, and beginning around line #520. Good luck Anon! :^) >=== -patch crosslink

Edited last time by Chobitsu on 06/07/2023 (Wed) 12:31:30.

Robowaifu Technician 06/07/2023 (Wed) 13:55:30 No.22988

>>22987 for simple arithmetic you wouldnt use any branching at all really


key = GetKeyPressed();
framespeed += (key == KEY_KP_ADD) & (framespeed < max);
framespeed -= (key == KEY_KP_SUBTRACT) & (framespeed > min);

Chobitsu 06/07/2023 (Wed) 14:22:10 No.22989

>>22988 Good, efficient logic Anon. I like the form. But we're still in a beginner's classroom thread, so it's better to take a couple-nanosecond speed hit, for clarity of reasoning for the novice. But again, nice work! :^)

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