news Ticker probelm

[atif_ilm]

Hi now a days i am developing a news ticker , just like one we could see on news channels at bottom a strip in which Text and logos scrolls from right to left.

i have succeeded in scrolling the text , but i am feeling difficulty in scrolling logos or image alongwith text.

so can anybody give some hint how to do it , or article abut such news ticker.

even i dont mind to buy some news ticker component or stuff but i am not able to find one.

[japanfred]

Well, lets think about it.

You might have a string that contains...

char *strTicker = "This is my ticker, here is an image!";

And, according to that string, there is supposed to be an image at the end of it.
Obviously there isnt, so when we scroll this is will just be a string of text, like it is with yours now i assume.

To place the Image at the right place, you firstly need to find out where it needs to be!

If your doing a predefined string, then it's not a problem, you could put '[image]' in your string so you could place it there.

char *strTicker = "This is my ticker, here is an image![image]";

Like that!

Then, every frame you need to check your string, and get it's X position, because it could be halfway off the screen, and if were still drawing onto the end of where the string USED to be, we'll just have a static image!!

So we get the X position of the string, now we have to get the strings length in pixels...i know DirectX has a function for this in the API, i don't know what your using though...

So now, we have the X position of the Ticker, and the String Pixel length.

int iXPos, iTickerStrLen;
char *strTicker = "This is my ticker, here is an image![image]";

//Here's the loop
while ( looping )
{
      //Get the X position of the string...probably held in a RECT or similar.

      //Get the length of the string in pixels, it'll be part of the FONT class you'll use probably.
      //Now we have the length of the string in pixels, held in iTickerStrLen
      //and we have the position of the scrolling text held in iXPos.

      //We now know that if we do a sum....

      int iImagePos = ( iXPos + iTickerStrLen );

      //We have the position of where the [image] should be.
      //Of course, this code only lets you add ONE image, and thats
      //at the end, so you'll need to add some string searching code in!!
      //But now we have the position....you can run a function that will
      //draw your image, at the end of the string, constantly.
      //hope this helps...


}

That should be enough to get you off your feet

Have fun!!


Dean.

[japanfred]

All this talk of News Tickers has spured me on to make my own one, hehe.

I started one a while ago, but got bored of it.

I think i'll start again, i'm sure i'll be able to help you more then

Good luck!

[atif_ilm]

Well, lets think about it.

You might have a string that contains...

char *strTicker = "This is my ticker, here is an image!";

And, according to that string, there is supposed to be an image at the end of it.
Obviously there isnt, so when we scroll this is will just be a string of text, like it is with yours now i assume.

To place the Image at the right place, you firstly need to find out where it needs to be!

If your doing a predefined string, then it's not a problem, you could put '[image]' in your string so you could place it there.

char *strTicker = "This is my ticker, here is an image![image]";

Like that!

Then, every frame you need to check your string, and get it's X position, because it could be halfway off the screen, and if were still drawing onto the end of where the string USED to be, we'll just have a static image!!

So we get the X position of the string, now we have to get the strings length in pixels...i know DirectX has a function for this in the API, i don't know what your using though...

So now, we have the X position of the Ticker, and the String Pixel length.

int iXPos, iTickerStrLen;
char *strTicker = "This is my ticker, here is an image![image]";

//Here's the loop
while ( looping )
{
      //Get the X position of the string...probably held in a RECT or similar.

      //Get the length of the string in pixels, it'll be part of the FONT class you'll use probably.
      //Now we have the length of the string in pixels, held in iTickerStrLen
      //and we have the position of the scrolling text held in iXPos.

      //We now know that if we do a sum....

      int iImagePos = ( iXPos + iTickerStrLen );

      //We have the position of where the [image] should be.
      //Of course, this code only lets you add ONE image, and thats
      //at the end, so you'll need to add some string searching code in!!
      //But now we have the position....you can run a function that will
      //draw your image, at the end of the string, constantly.
      //hope this helps...


}

That should be enough to get you off your feet

Have fun!!


Dean.

Thanx a lot , enough for getting started.

[atif_ilm]

All this talk of News Tickers has spured me on to make my own one, hehe.

I started one a while ago, but got bored of it.

I think i'll start again, i'm sure i'll be able to help you more then

Good luck!

My pleasure.