Turn two CGPoints into a CGRect - ios

Question

How can I, given two different CGPoints, turn them into an CGRect?
Example:
CGPoint p1 = CGPointMake(0,10);
CGPoint p2 = CGPointMake(10,0);
How can I turn this into a CGRect?

Answer 1

This will take two arbitrary points and give you the CGRect that has them as opposite corners.
CGRect r = CGRectMake(MIN(p1.x, p2.x),
MIN(p1.y, p2.y),
fabs(p1.x - p2.x),
fabs(p1.y - p2.y));
The smaller x value paired with the smaller y value will always be the origin of the rect (first two arguments). The absolute value of the difference between x values will be the width, and between y values the height.

Answer 2

A slight modification of Ken's answer. Let CGGeometry "standardize" the rect for you.
CGRect rect = CGRectStandardize(CGRectMake(p1.x, p1.y, p2.x - p1.x, p2.y - p1.y));

Answer 3

Swift extension:
extension CGRect {
init(p1: CGPoint, p2: CGPoint) {
self.init(x: min(p1.x, p2.x),
y: min(p1.y, p2.y),
width: abs(p1.x - p2.x),
height: abs(p1.y - p2.y))
}
}

Answer 4

Assuming p1 is the origin and the other point is the opposite corner of a rectangle, you could do this:
CGRect rect = CGRectMake(p1.x, p1.y, fabs(p2.x-p1.x), fabs(p2.y-p1.y));

Answer 5

This function takes any number of CGPoints and gives you the smallest CGRect back.
CGRect CGRectSmallestWithCGPoints(CGPoint pointsArray[], int numberOfPoints)
{
CGFloat greatestXValue = pointsArray[0].x;
CGFloat greatestYValue = pointsArray[0].y;
CGFloat smallestXValue = pointsArray[0].x;
CGFloat smallestYValue = pointsArray[0].y;
for(int i = 1; i < numberOfPoints; i++)
{
CGPoint point = pointsArray[i];
greatestXValue = MAX(greatestXValue, point.x);
greatestYValue = MAX(greatestYValue, point.y);
smallestXValue = MIN(smallestXValue, point.x);
smallestYValue = MIN(smallestYValue, point.y);
}
CGRect rect;
rect.origin = CGPointMake(smallestXValue, smallestYValue);
rect.size.width = greatestXValue - smallestXValue;
rect.size.height = greatestYValue - smallestYValue;
return rect;
}

Answer 6

This will return a rect of width or height 0 if the two points are on a line
float x,y,h,w;
if (p1.x > p2.x) {
x = p2.x;
w = p1.x-p2.x;
} else {
x = p1.x;
w = p2.x-p1.x;
}
if (p1.y > p2.y) {
y = p2.y;
h = p1.y-p2.y;
} else {
y = p1.y;
h = p2.y-p1.y;
}
CGRect newRect = CGRectMake(x,y,w,h);

Answer 7

let r0 = CGRect(origin: p0, size: .zero)
let r1 = CGRect(origin: p1, size: .zero)
let rect = r0.union(r1).standardized