Trigfunction behave unexpected [Not input range-, bu maybe inverted sin-related)

Mon, 22 Jan 2024 10:51:31 UTC

I've started up a new project and I'll be making extensive use of the trig-functions, so I started playing around with them. I soon found out about the input range and the inverted sin, but I still can not explain the behavior I'm seeing.

What you would expect from sin(x)cos(x) and what you can intuitively read from the graph is that first peak of sin(x)cos(x) should be negative, and the second positive. The actual behavior can be explained by the inverted sin-function, but with the inverted sin-function, I would expect the sin-graph to reflect the inversion, which it does not.

Code:

function _draw()
    cls()
    print("cos(x)",10)
    print("sin(x)",12)
    print("sin(x)*cos(x)",14)
    for x=1, 127 do
        pset(x, 64,3)
        pset(x, 64+32*cos(x/127),10)
        pset(x, 64+32*sin(x/127),12)
        pset(x, 64+32*sin(x/127)*cos(x/127),14)

    end
end

(Sorry, I don't know how to format code on the BBS)

Kons 1.0.1

Sat, 20 Jan 2024 15:44:19 UTC

Kons 1.0.1

by Sysse

[Click to Play]

Kons 1.0

by Sysse

[Click to Play]

First release of my first game (in any engine/platform).

It's basically Snake, but you grow automatically and have to consume healthy fruit and vitamins to stay short.

Version 1.0.1
Added a border to the screen to help see where the edges are

Sysse [Lexaloffle Blog Feed]

Trigfunction behave unexpected [Not input range-, bu maybe inverted sin-related)

Kons 1.0.1