Sinus Curve

[Anon]

Could someone help me in this easy one?
I'm trying to draw a sinus curve in a image (suppose 300x300) with the center in (150x150)
How can I do it?
Thanks guys

[[deleted]]

Quite simple, the X is a for loop form -300 to 300
(or 0 to 600, minus 300)

the Y axis is sin(x)*max_y_deviation.

You'll have to adjust the x in sin(x) because sin(3.14) is already 1, so your sin will go up and down in 6 pixels along the x axis.

The basic idea is this (untested):

for ($x=-300;$x<300;$x++)
{
$y=150+sin(x/50);

plot a pixel at ($x,$y);

};

[[deleted]]

Ofcourse, the -300 and 300 should be -150 and 150

And the -150 is not a valid X value in the picture, so you'd have to add 150 to it before plotting the pixel:

plot a pixel at ($x+150,$y)