Sin(): only positive wave - Processing Forum

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knuppel

knuppel

Sin(): only positive wave

in Programming Questions • 4 months ago

I tried this example:

http://processing.org/reference/sin_.html

How can only display the positive wave?

1

Replies(3)

PhiLho

PhiLho

Re: Sin(): only positive wave

4 months ago

Perhaps with the abs() function? Or constrain(), if you want another effect.

datguy

datguy

Re: Sin(): only positive wave

4 months ago

Is this what you want?

float a = PI;
float inc = TWO_PI/25.0;
for (int i = 0; i < 50; i=i+4) {
line(i, 50, i, 50+sin(a)*40.0);
a = a + inc;
}

PhiLho

PhiLho

Re: Sin(): only positive wave

4 months ago

float a = 0.0;
float inc = TWO_PI/25.0;
for (int i = 0; i < 100; i += 4) {
line(i, 50, i, 50 + sin(a) * 40.0);
a += inc;
}

=>

float a = 0.0;
float inc = TWO_PI/25.0;
for (int i = 0; i < 100; i += 4) {
line(i, 50, i, 50 - abs(sin(a)) * 40.0);
a += inc;
}

or

float a = 0.0;
float inc = TWO_PI/25.0;
for (int i = 0; i < 100; i += 4) {
line(i, 50, i, 50 - constrain(sin(a), 0, 1) * 40.0);
a += inc;
}

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