Topics

1

General / How would you do pendulum movement?

« on: March 23, 2020, 08:32:47 pm »

Trying to make the player swing on a pendulum with the mouse on a right-click being the pivot, so far managed to find the distance between the player and the mouse, the angle, and from that the pendulum period and frequency. How do I use these to calculate velocity?

2

General / How do i download the 'simple collision detection' off of github.

« on: March 19, 2020, 07:48:30 pm »

I mean this => https://github.com/SFML/SFML/wiki/Source:-Simple-Collision-Detection-for-SFML-2
I have no idea how github works.
Tried going to code - download zip and that just downloaded sfml.
Tried to clone it on github desktop, and it came up with 'Clone succeeded, but checkout failed'. Then told me to put in a command but I have no idea where to put in a command.

3

System / How to restart the clock when it gets to a value

« on: March 07, 2020, 10:09:02 pm »

I'm multiplying the movement in my game by the time since the last time movement was applied, which causes problems when you don't do anything for a while. Doing this:
if (loopclock.getElapsedTime().asSeconds() > 1){loopclock.restart();}
doesn't work for some reason, another solution to my movement system would also be appreciated.

4

General / All sprites disappear when i scale up any sprites. [solved]

« on: March 07, 2020, 08:56:01 pm »

    Sprite player;
    player.setTexture(blue);
    player.setColor(Color(0, 255, 0));

    Sprite sprite1;
    sprite1.setTexture(blue);
    sprite1.setPosition(Vector2f(0, 700));

Works fine, but this:

    Sprite player;
    player.setTexture(blue);
    player.setColor(Color(0, 255, 0));

    Sprite sprite1;
    sprite1.setTexture(blue);
    sprite1.setPosition(Vector2f(0, 700));
    sprite1.setScale(10.f, 0.f);

causes sprite1 to not be drawn, or registered in my collision system, similar issue happens when I try and add a third sprite.

5

General / Movement system does not work.

« on: February 15, 2020, 04:17:16 pm »

Made a basic movement system from scratch using a switch rather than if statements, sprite is drawn but does not move.
   

 while (window.isOpen())
    {
        Event event;
        while (window.pollEvent(event))
        {
            // Checks the event
            switch (event.type){

                  // if you press close, close the window
                  case event.Closed: {
                          window.close();
                          break;}
                  case event.KeyPressed: {
                           switch (event.key.code){

                                   case Keyboard::A:{
                                        playerleft = true;
                                        break;}
                                   case Keyboard::D:{
                                        playerright = true;
                                        break;}

                                   default:
                                         break;    }
                                         }
                  case event.KeyReleased: {
                           switch (event.key.code){

                                   case Keyboard::A:{
                                        playerleft = false;
                                        break;}
                                   case Keyboard::D:{
                                        playerright = false;
                                        break;}
                                   default:
                                        break;   }
                  default:
                       break;

                                         }

                            } // closes the check event switch
       } // closes the event check loop




       Clock clock;
       float alphaTime = clock.restart().asSeconds();

       if (playerleft == true){
        xvel = -1;
       }
       if (playerright == true){
        xvel = 1;
       }
       if (xvel > 0){
        xvel =- 1*alphaTime;
       }
       if (xvel < 0){
        xvel =+ 1*alphaTime;
       }
       player.move(Vector2f(0.f+xvel,0.f+yvel));



        window.clear();
        window.draw(player);
        window.display();


    } // closes the window open loop

New to c++/sfml so sorry if this is a stupid question.