Topics

1

Graphics / [SFML 2.0] Spawn projectiles to mouse pointer problem

« on: May 19, 2013, 01:18:39 pm »

Basically, I have a function that has a spaceship follow the mouse pointer, which works perfectly.

        void lookAtMouse(sf::RenderWindow &app)
        {
                sf::Vector2f curPos = sprite.getPosition();
                sf::Vector2i position = sf::Mouse::getPosition(app);

                const float PI = 3.14159265;

                float dX = curPos.x - position.x;
                float dY = curPos.y - position.y;

                float rotation = (atan2(dY, dX)) * 180 / PI;

                sprite.setRotation(rotation - 180);
        }
 

I've tried to modify this to work for the projectiles it shoots, however it doesn't work and causes all kinds of graphical glitches, which I think I know why.

void MoveBullet(int numOfBullets)
{
        for (int i = 0; i < numOfBullets; i++)
        {
                                        sf::Vector2f curPos = bullet[i].getPosition();
                                        sf::Vector2i position = sf::Mouse::getPosition(app.window);

                                        const float PI = 3.14159265;

                                        float dX = curPos.x - position.x;
                                        float dY = curPos.y - position.y;

                                        float rotation = (atan2(dY, dX)) * 180 / PI;

                                    if (bullet[i].exists) bullet[i].Move(dX, dY);
        }
}
 

How would I approach having the projectiles fire to wherever the mouse pointer is? I can provide full source if required.

2

Window / [SFML 2.0] 2D diagonal movement problem

« on: May 17, 2013, 06:52:15 pm »

Minor question that is probably me being a huge derp, but nevertheless I am momentarily stumped.

Basically, I'm trying to implement 2D movement, which works fine, however when I try to move diagonally, the sprite faces the right direction, but its coords don't change and it doesn't move.

if(sf::Keyboard::isKeyPressed(sf::Keyboard::Up)&&sf::Keyboard::isKeyPressed(sf::Keyboard::Left))
{
   Ship_s.setRotation(135.f);
   Ship_s.move(7, 7);
}
 

3

Graphics / SFML 2.0 - Move in direction faced

« on: May 12, 2013, 04:42:47 pm »

if (sf::Keyboard::isKeyPressed(sf::Keyboard::Left))  
              Ship_s.rotate(7.f);
      if (sf::Keyboard::isKeyPressed(sf::Keyboard::Right))
              Ship_s.rotate(-7.f);
      if (sf::Keyboard::isKeyPressed(sf::Keyboard::Up))    
             Ship_s.move(cos(Ship_s.getRotation()*3.14159265/180)*3.f,sin(Ship_s.getRotation()*3.14159265/180)*-3.f);
      if (sf::Keyboard::isKeyPressed(sf::Keyboard::Down))  
             Ship_s.move(cos(Ship_s.getRotation()*3.14159265/180)*-3.f,sin(Ship_s.getRotation()*3.14159265/180)*3.f);

 

The above code works, however when I try to move the ship around the screen, it only moves in the correct direction in one of the compass directions.

What do?

EDIT: https://www.youtube.com/watch?v=0SRkzad7sVw&feature=youtu.be Here's a video of what happens.

4

Graphics / SFML 2.0 - Movement lag issue

« on: May 10, 2013, 08:51:17 pm »

I'm fairly new to SFML 2.0, used SFML 1.6 for a while so not completely new to SFML.

Basically, since 2.0 was released I figured I'd rewrite the game I'm working on to use SFML 2.0. The process went smoother than I thought it would do, but I've hit a snag. It's not exactly a big error, but the movement in all directions is fairly jittery, even with VSync/framelimits.

#include <SFML/Graphics.hpp>
#include <SFML/System.hpp>
//#include "projectile.h"
#include <iostream>

int main()
{
   sf::RenderWindow App(sf::VideoMode(800, 600, 32), "Asteroids");
   sf::Texture Ship;
   sf::Texture Space;
   if(!Ship.loadFromFile("ship.png"))
           return EXIT_FAILURE;
   if(!Space.loadFromFile("space-1.png"))
           return EXIT_FAILURE;

   sf::Sprite Ship_s;
   Ship_s.setTexture(Ship);
   sf::Sprite Space_s(Space);
   Ship_s.setPosition(200.f, 100.f);
   Ship_s.setScale(1.f, 1.f);

   sf::Clock clock;
   App.setFramerateLimit(120);
   //App.setVerticalSyncEnabled(true);
   while (App.isOpen())
   {
      sf::Time dt=clock.restart();
      sf::Event Event;
      while (App.pollEvent(Event))
      {
         if (Event.type == sf::Event::Closed)
            App.close();
      }

     
      if (sf::Keyboard::isKeyPressed(sf::Keyboard::Left))  
              Ship_s.move(-1 * 100 *dt.asSeconds(), 0);
      if (sf::Keyboard::isKeyPressed(sf::Keyboard::Right))
              Ship_s.move( 1 * 50 * dt.asSeconds(), 0);
      if (sf::Keyboard::isKeyPressed(sf::Keyboard::Up))    
              Ship_s.move( 0,-1 * 50 * dt.asSeconds());
      if (sf::Keyboard::isKeyPressed(sf::Keyboard::Down))  
              Ship_s.move( 0, 1 * 50 * dt.asSeconds());

      App.clear();
      App.draw(Space_s);
      App.draw(Ship_s);
      App.display();
   }
   return EXIT_SUCCESS;
}

 

If needed, I can post a video of what it looks like. Currently running this on the latest version of Fedora 18 x86_64 on an Acer Aspire 7730. Is there anything I can do to reduce the lag?