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Relaxing (lemmy.world)

submitted 8 months ago by CenturionKing to c/funny

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[–] FooBarrington 7 points 8 months ago* (last edited 8 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 8 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 8 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.