Ellipse around a track

General
1

Hi everyone, i have this code…


function setup()
    ellipseMode(CENTER)
    displayMode(FULLSCREEN)
end

function draw()
    background(255, 255, 255, 255)
    
    noFill()
    
    strokeWidth(5)
    stroke(0, 0, 0, 255)
    ellipse(WIDTH/2,HEIGHT/2,WIDTH-200,HEIGHT-200) 
end

What i want to do is have a small circle follow the oval around, is that possible??
Thx

2

@Klupa56 It would just be a matter of increasing an angle from 0 to 360 and calculate the x,y point on an ellipse.

3

@Klupa56 Here’s an example.


displayMode(FULLSCREEN)

function setup()
    ellipseMode(CENTER)
    t=0
    print(WIDTH-200)
    print(HEIGHT-200)
end

function draw()
    background(255, 255, 255, 255)
    noFill()
    strokeWidth(5)
    stroke(0, 0, 0, 255)
    ellipse(WIDTH/2,HEIGHT/2,WIDTH-200,HEIGHT-200) 
    fill(255,0,0)
    strokeWidth(0)
    t=t+.5
    x=WIDTH/2+(WIDTH-200)/2*math.cos(math.rad(t))
    y=HEIGHT/2+(HEIGHT-200)/2*math.sin(math.rad(t))
    ellipse(x,y,20)
end
4

Thx a lot