Hey, I am having a bit of trouble getting a simple wave motion algorithm together.... Ok, I have a 2d wave sprite that starts at Xcoord -53 and then moves to Xcoord 23, then goes back to -53, etc. etc.. Now, what I would like is for the wave to slowly pick up speed at the beginning and slowly come to a halt before changing directions as to simulate a smooth wave motion...AND...take in consideration processor speeds so that the wave motion is basically the same speed on every computer. I''ll try to paste the code I am using now to handle the wave motion to the right, below: if (FrontWave->m_VelX == 1) //wave is moving to the right { if (FrontWave->m_TimeStamp != 0) { if (FrontWave->m_PosX == 93){FrontWave->m_Velocity=80;} if (FrontWave->m_PosX >= 40 && (float(timeGetTime()-FrontWave->m_TimeStamp) > FrontWave->m_Velocity)) { FrontWave->m_PosX--; FrontWave->m_Velocity--; FrontWave->m_TimeStamp=0; } if (FrontWave->m_PosX > 0 && FrontWave->m_PosX < 40 && (float(timeGetTime()-FrontWave->m_TimeStamp) > FrontWave->m_Velocity)) { FrontWave->m_PosX--; FrontWave->m_TimeStamp=0; } if (FrontWave->m_PosX <= 0 && (float(timeGetTime()-FrontWave->m_TimeStamp) > FrontWave->m_Velocity)) { FrontWave->m_PosX--; FrontWave->m_Velocity++; FrontWave->m_TimeStamp=0; } if (FrontWave->m_PosX <= -53){FrontWave->m_PosX=-53;FrontWave->m_VelX=0;} } if (FrontWave->m_TimeStamp == 0){ FrontWave->m_TimeStamp = timeGetTime();} } .......If anyone has any tips they could offer I would appreciate it, Thanks

I would suggest using sin() since a sinusoide(?) has a wavy pattern...

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Drago

If you want to use Drago''s suggestion, a formula would be:

Xcoord = -15 + 38 * sin (2.0 * M_PI * (time / time_per_wave));

If you''re intent on doing things by velocity rathar than absolute position you can use:

VelX = 38.0 * 2.0 * M_PI / time_per_wave * cos(2.0 * M_PI * (time / time_per_wave));

However using that could suffer from rounding error as time goes on, and only works if your frame rate is relatively high.