6 replies to this topic

[chris2307]

Hi all,

I am trying to create some vector objects which will act as stars on the screen to fly past to the left. At the moment, I cannot get this to work. Can anyone see what I am doing wrong? The screen goes black so I think it may be a directX error but when I take out the push_back line, it works fine. The code below is creating an object and moving it. The code underneath that is the star class (All very simple... or I thought).

stars.push_back(star(SCREEN_WIDTH, SCREEN_HEIGHT));
for (std::vector<star>::iterator IT = stars.begin(); IT != stars.end(); IT++)
{
(*IT).move();
}

class star
{
private:
int yPos;
int xPos;
public:
star(int sw, int sh)
{
  yPos = sh/2;
  xPos = sw;
}
void move()
{
  xPos--;
}
int xPosition()
{
  return xPos;
}
int yPosition()
{
  return yPos;
}
};

Cheers

[FLeBlanc]

We'd need to see more code. This tells us nothing about how you're drawing the stars.

[chris2307]

Thanks for the reply. This is how I am drawing the image. Obviously, I am creating the texture before anything is executed.

D3DXCreateTextureFromFile(d3dDevice, "star.png", &starSprite);

for(std::vector<star>::iterator IT = stars.begin(); IT != stars.end(); )
{
  D3DXVECTOR3 starPosition((*IT).xPosition(), (*IT).yPosition(), 0);
  d3dSprite->Draw(starSprite, NULL, &center, &starPosition, D3DCOLOR_XRGB(255, 255, 255));
}

[Álvaro]

Thanks for the reply. This is how I am drawing the image. Obviously, I am creating the texture before anything is executed.

D3DXCreateTextureFromFile(d3dDevice, "star.png", &starSprite);

for(std::vector<star>::iterator IT = stars.begin(); IT != stars.end(); )
{
  D3DXVECTOR3 starPosition((*IT).xPosition(), (*IT).yPosition(), 0);
  d3dSprite->Draw(starSprite, NULL, &center, &starPosition, D3DCOLOR_XRGB(255, 255, 255));
}

Where did the increment for IT go?

[kd7tck]

Don't be scared to show us all your code.

[rip-off]

Have you tried stepping through one game loop using your debugger?

[chris2307]

Where did the increment for IT go?

Umm... I'm not sure

Seems to have solved my problem though, putting it back in. Should have noticed that really as I have plenty of other sprites using the same method as I am doing this. Thanks for pointing out what i missed!