How to make speed indicator??

KAHIMA · Post by **KAHIMA** » Tue Apr 07, 2009 7:40 am

I want to make speed indicator in my programs, but i dont know how to create it?? What class or code that i should use ?? Thanks before

Sylence · Post by **Sylence** » Tue Apr 07, 2009 7:51 am

What do you mean with speed indicator? A speedometer? Or a blur effect when something moves? Or something completely different ?

KAHIMA · Post by **KAHIMA** » Tue Apr 07, 2009 8:12 am

Yups... i want to make speedometer... How can i create it??

Sylence · Post by **Sylence** » Tue Apr 07, 2009 8:24 am

You have to make one yourself.
You could use a simple texture as a background and draw a line from the center to the edge in a certain angle that depends on the speed.

KAHIMA · Post by **KAHIMA** » Tue Apr 07, 2009 8:58 am

I already made the picture,,what should I do next??
How does I make it??
I don't have any idea how to make it...

Sylence · Post by **Sylence** » Tue Apr 07, 2009 9:23 am

You can use sine and cosine to get coordinates on a circle for a certain angle.
With that you draw a line ( for example using IVideoDriver::draw2DLine() ) from the center of the texture to the position you calculated.

For the angle you have to devide the circle into steps ( for example 1 degree for 1 mph would mean that the speedometer ranges from 0 to ~180 mph )