How to make a sine wave with a transform

[sona.viswam]

Transform should move as a wave.

How to do it in c#?

[fafase]

Use Mathf.Sin.
Ok you want the guy to go left and right AND up and down. Now it looks like the guy is somehow “bouncing” at the bottom instead of having a rounded turn.

So!!! You need to use a cos function on the y axis but as absolute value to create the sharp shape at the bottom.
Then you use another cos function on the x axis so that it moves left and right. But first, create an empty game object that you place where you want this to happen. Then add your moving object as child to it.

Then use the code below on the child object.

float amplitudeX = 10.0f;
float amplitudeY = 5.0f;
float omegaX = 1.0f;
float omegaY = 5.0f;
float index;

public void Update(){
    index += Time.deltaTime;
	float x = amplitudeX*Mathf.Cos (omegaX*index);
	float y = Mathf.Abs (amplitudeY*Mathf.Sin (omegaY*index));
	transform.localPosition= new Vector3(x,y,0);
}

Now your object is going left to right to left and so on, but also up and down with the bouncing effect at the bottom.

Now it is up to you to modify amplitude to define how large is the movement and omega defines how fast is the movement. If you want to remove the bouncing, remove the Mathf.Abs.

[iMagesBlues]

A no code-solution is to use Mecanim. Draw a sine-wave graph for the transform’s y-position variable in the Animation Window > Curves.