Bruce Wayne Bruce Wayne - 1 month ago 10
Java Question

Making a circle using lines in java

I've checked all the other questions related to this and they haven't helped me. I'm not trying to make a duplicate question. I need to create a circle in java using lines (9 to be exact for that im working on right now).
Formula

int points = 9;
int r = 100;
float originX = width/2+r;
float originY = height/2;
float angle1;
float angle2;

void setup() {
size(500, 500);
}

void draw() {
for(int i=0; i < points;++i) {
angle1 = i * 2 * PI / points;
angle2 = i * 2 * PI / points;
line(originX + r * cos( angle1), originY + r * sin(angle1),
originX + r * cos( angle2), originY + r * sin(angle2));
}
}


That is the formula and I know the circumfrence of a circle is 2pi radians so I was using (2*pi)/9 as my theta for both.
My current code is located above

Can someone tell me how to get this working?

Answer

Currently, you are drawing the spokes of a wheel, rather that the circumference. To do this you want to draw a line from the i-th point to the (i+1)-th point

for(int i=0; i < points;++i) {
    angle1 = i * 2 * Pi / points;
    angle2 = (i+1) * 2 * Pi / points;
    line(OriginX + r * cos( angle1), OriginY + r * sin(angle1),
         OriginX + r * cos( angle2), OriginY + r * sin(angle2)) ;
}