Get all CGPoint from the area of circle - ios

Question

I have center points and radius of circle, I just wanna get all CGPoint that the area of the circle covers. Basically I need to get all pixels through these CGPoint, I have a code for getting pixel from UIImage through CGPoint. I'm getting center points of circle through UITapGestureRecognizer when user tap. And I already know about radius of circle.
Can anyone tell me how I can get all CGPoint or pixels from circle. Thanks
For Example
Origin of below circle is CGPoint(x: 206, y: 105), and diameter of a circle is 50.
Another Example
How I can get these all CGPoints

Answer 1

First, You get minX and minY maybe in radius from center.
Second, check point by point and calculate distance to center.
func distance(from: CGPoint, to: CGPoint) -> CGFloat {
return CGFloat(sqrt((from.x - to.x)*(from.x - to.x) + (from.y - to.y)*(from.y - to.y)))
}
func isInCircle(withCenter center: CGPoint, point: CGPoint, radius: CGFloat) -> Bool {
return distance(from: center, to: point) <= radius
}
func getPoints(withCenter center:CGPoint, radius: CGFloat) -> [CGPoint] {
let minX = Int(center.x - radius)
let minY = Int(center.y - radius)
let maxX = Int(center.x + radius)
let maxY = Int(center.y + radius)
var result = [CGPoint]()
for x in minX...maxX {
for y in minY...maxY {
let point = CGPoint(x: x, y: y)
if isInCircle(withCenter: center, point: point, radius: radius) {
result.append(point)
}
}
}
return result
}
let x = getPoints(withCenter: CGPoint.init(x: 206, y: 150), radius: 50)
print(x)