Need help with fixing my rounded rectangle calculation

public RoundRect(float width, float height, float r) {
    if (width < r || height < r) { throw new Exception("Radius"); }
    this.width = width - 2*r;
    this.height = height - 2*r;
    this.r = r;
public float CornerByAxisPoint(float p, bool positive) {
    if (Mathf.Abs(p) > r) {
        p = Mathf.Clamp(p, -r, r);
    }
    return Mathf.Sqrt(r * r - p * p) * (positive ? 1 : -1);
}
public Vector2 GetPointOnBase(float x, bool topSide) {
    if (x <= width) { return new Vector2(x+(topSide ? 0 : -width), (topSide ? r : -r)); }
    else if (x > width) { return new Vector2(x+(topSide ? 0 : -width*2-r), CornerByAxisPoint(x-width+(topSide ? 0 : -r), topSide)); }
    else throw pointOut;
}
public Vector2 GetPointOnLegs(float y, bool rightSide) {
    if (y <= height) { return new Vector2(0, y * (rightSide ? -1 : 1)); }
    else if (y > height) { return new Vector2(CornerByAxisPoint(y-height, rightSide)+(rightSide ? -r : r), (rightSide ? -y : y)); }
    else throw pointOut;
}
public Vector2 GetPoint(float p) {
    if (p <= radWidth) {
        return GetPointOnBase(p, true)+Vector2.right*r; }
    else if (p > radWidth && p <= radWidth + radHeight) {
        return GetPointOnLegs(p - radWidth, true)+Vector2.right*fullWidth; }
    else if (p > radWidth + radHeight && p <= radWidth*2 + radHeight) {
        return GetPointOnBase(p - (radWidth + radHeight), false)+Vector2.right*radWidth+Vector2.down*height; 
    } else if (p > radWidth*2 + radHeight && p <= radWidth*2 + radHeight*2) {
        return GetPointOnLegs(p - (radWidth*2 + radHeight), false)+Vector2.down*height;
    } else throw pointOut;
}
public Vector2 Interpolate(float t) => GetPoint(Mathf.Lerp(0f, perimeter, t));