Messages

106

General discussions / How to make an sprite go to correct direction

« on: January 04, 2011, 02:12:48 am »

Hi s3rius,

Your function works like a charm.

You can see my game prototype here:
http://www.prsolucoes.com/downloads/solodefender.zip

But i have a simple problem now, my shoot with your function go correctly to X/Y position, but i need that it continue moving if not collide with target, so i need that the shoot continue moving to current direction and go out of screen.

So resuming:
How i can change your function to make my shoot go to a direction based on targetX / targetY position and dont stop move?

107

General discussions / How to make an sprite go to correct direction

« on: December 18, 2010, 04:04:26 am »

Is it that i do.

TargetX and TargetY is the position of enemy (x and y).

The problem is that i need rotate the laser to point to the enemy, and make the bullet go to targetX and targetY on the correspondent angle.

108

General discussions / How to make an sprite go to correct direction

« on: December 11, 2010, 06:39:08 am »

Hi,

On my game i want that my shoot go to correct direction (enemy direction), but it doesnt occur.

You can see here:
http://www.prsolucoes.com/downloads/solodefender.zip

The code that im using is (on update):

Code: [Select]



void Bullet::update()
{
updateSpriteDirection();
checkCollision();
updatePosition();
}

void Bullet::updateSpriteDirection()
{
sprite.SetRotation( Functions::angle(sprite.GetPosition().x, sprite.GetPosition().y, targetX, targetY) );
}

void Bullet::checkCollision()
{
if (sprite.GetPosition().x + sprite.GetSize().x < 0)
{
remove();
}
else if (sprite.GetPosition().y + sprite.GetSize().y < 0)
{
remove();
}
else if (sprite.GetPosition().x > Constants::SCREEN_WIDTH)
{
remove();
}
else if (sprite.GetPosition().y > Constants::SCREEN_HEIGHT)
{
remove();
}
}


void Bullet::updatePosition()
{
sprite.SetPosition(sprite.GetPosition().x + speedX, sprite.GetPosition().y + speedY);
}

void Bullet::updateSpeed()
{
if (sprite.GetPosition().x < targetX)
{
speedX = Constants::BULLET_SPEED;
}

if (sprite.GetPosition().x > targetX)
{
speedX = (Constants::BULLET_SPEED * -1);
}

if (sprite.GetPosition().y < targetY)
{
speedY = Constants::BULLET_SPEED;
}

if (sprite.GetPosition().y > targetY)
{
speedY = (Constants::BULLET_SPEED * -1);
}
}



What is wrong?

109

General / How to remove class/sprite

« on: December 10, 2010, 02:54:44 pm »

Hi,

With boost smartpointer, when i do the ERASE from vector it will be deleted?

Do you have a function example?

110

General / How to remove class/sprite

« on: December 09, 2010, 10:05:24 pm »

To delete the class from memory, i invoke:

Code: [Select]

delete this;

And now the destructor is called.

111

General / How to remove class/sprite

« on: December 09, 2010, 09:46:43 pm »

So nexus, what you recommend?

112

General / How to remove class/sprite

« on: December 04, 2010, 07:05:55 pm »

Hi,

What i do to prevent it, is make a loop on this vector objects without look it, an example:

Code: [Select]

for (long x = 0; x < (long)GameObjects::enemies->size(); ++x)
{
    Enemy *enemy = GameObjects::enemies->at(x);
    ...
    enemy->remove();
}

The remove method is:

Code: [Select]

GameObjects::enemies->erase(std::find(GameObjects::enemies->begin(), GameObjects::enemies->end(), this));

So, when i need loop vectors, i will use FOR without iterator, then i can remove without problems.

With this solution my problem is solved.

This is a good practice?

113

General / How to remove class/sprite

« on: December 04, 2010, 05:16:39 pm »

Hi,

The problem is that if im in the loop, and a method in this loop remove an element from the vector, the program crashes, an example:

Code: [Select]


for (std::vector<Enemy*>::iterator it = GameObjects::enemies->begin(); it!=GameObjects::enemies->end(); ++it) {
((Enemy*)*it)->update();
}


The update check the collision and call remove method:

Code: [Select]

if (Collision::PixelPerfectTest(sprite, GameObjects::planet->getSprite()))
{
GameObjects::enemies->erase(std::find(GameObjects::enemies->begin(), GameObjects::enemies->end(), this));
}


When ERASE method is called, the program crashes.

114

General / How to remove class/sprite

« on: December 04, 2010, 05:05:15 pm »

Hey laurent,

Sorry man, i dont see your posts.

Now i change my solution for yours, its simply perfect.

Thanks very much, it help a lot.

115

General / How to remove class/sprite

« on: December 04, 2010, 07:29:00 am »

Hi,

I resolve the problem with:

Code: [Select]


for (long x = 0; x < (long)GameObjects::enemies->size(); ++x)
{
Enemy *enemy = GameObjects::enemies->at(x);

if (enemy == this)
{
GameObjects::enemies->erase(GameObjects::enemies->begin() + x);
}

}



When i erase an element from vector, it is all removed from the memory?

116

General / How to remove class/sprite

« on: December 03, 2010, 10:30:26 pm »

Hi,

On my game i have a vector with all my enemies, and i want that when it collide with some other objects, be removed from vector and destroyed.

My vector:

Code: [Select]

static std::vector<Enemy*> *enemies;

What i have tested:

Code: [Select]

void Enemy::remove()
{
//GameObjects::enemies->erase(*this);
//delete this;

for (std::vector<Enemy*>::iterator it = GameObjects::enemies->begin(); it!=GameObjects::enemies->end(); ++it) {
if (((Enemy*)*it) == this)
{
GameObjects::enemies->erase(it);
}
}
}


But allways that i do it, i get a fatal error.

117

General discussions / Problem executing on different PC

« on: December 02, 2010, 03:37:45 pm »

Ok, thanks.

In release mode i dont test, only debug.

I only know where is this option for future problem.

Thanks man.

118

General discussions / Problem executing on different PC

« on: December 02, 2010, 03:05:53 pm »

Hi,

Thanks.

Where i see this option on visual studio 2008?

Other question:
You have SFML2 compiled library for VS 2008?

119

General discussions / Problem executing on different PC

« on: December 02, 2010, 06:18:10 am »

Hi,

Im making a sample app with SFML 1.6 on my PC (Windows 7 - 32bits) and it works nice.

But when i copy the files (exe + dll) to my other PC (Windows XP SP3 - 32bits), i got an error when open .EXE.

The error say that the application need be reinstalled and dont open.

What can be the problem?

120

General / Make some sfml objects as static

« on: November 28, 2010, 02:31:36 pm »

Hi,

I want make some objects static like RenderWindow,

Instaed of make on main file:
sf::RenderWindow App(sf::VideoMode(800, 600, 32), "SFML Graphics")

I have a classe called GameObjects, that will have a static attribute to hold the RenderWindow.

But i dont know how to do it, i get some erros, because i dont know how to do it without pointer objects, like:

GameObjects::app = new Object...