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Relaxing (lemmy.world)

submitted 6 months ago by CenturionKing to c/funny

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[–] johannesvanderwhales 21 points 6 months ago (2 children)

Never really understood people who say they don't use algebra. I use it very regularly.

[–] [email protected] 4 points 6 months ago (1 children)

I was thinking this myself. sin, cos, tan. Have not used. I have use euler coordinates so thats something but really solve for x is the most advanced thing I have used outside of school. mmmm actually I guess some statistics like stadard deviation.

[–] johannesvanderwhales 2 points 6 months ago

I recently had to do a two variable equation because I was using a recipe that called for a specific milk fat percentage by mixing cream and milk, and my cream was heavier than what it needed. That was really stretching the limits of what math I remember.

[–] [email protected] 2 points 6 months ago (1 children)

Programmer for 25 years. Only time I have ever used math more complicated than simple multiply/divide was... actually never.

That one time when I copy/pasted a formula for linear interpolation, was still just multiplication and division. And I still have no idea how it works.

I've even done OpenGL and graphics programming and still haven't needed any algebra/trig/etc, although I don't do complex 3D rendering or physics or anything like that.

I wish I knew how to do cool programming stuff like draw circles and waves and stuff though, but I've never seen a tutorial that didn't go WAY over my head immediately.

[–] FooBarrington 7 points 6 months ago* (last edited 6 months ago) (1 children)

Drawing a circle is actually pretty simple! Say we want to draw one with:

radius r=5
center C=(0,0)
1000 points

The logic would be:

for (let i = 0; i < 1000; i++) {
    // full circle is made up of 2 * PI angles -> calculate current loop angle
    const angle = (2 * Math.PI) * (i / 1000)
    const x = r * Math.cos(angle)
    const y = r * Math.sin(angle)
    drawPixel(x, y)
}

The circle starts being drawn at (5, 0). As y approaches -5, x gets smaller until it hits 0. Then x approaches -5 and y approaches 0, and so on.

[–] Valmond 1 points 6 months ago (1 children)

That won't work well ;-) it will draw 1000 pixels whatever the circumference!

A good start though, for sure.

[–] FooBarrington 1 points 6 months ago

It's just meant to be a simple example. If someone says other tutorials quickly go over their head, it's not a good idea to introduce unnecessary concepts to start with.