rohit Sidpara - 9 months ago 51

Objective-C Question

I have Rect and origin. I will check my origin point is in rect or not.

My Rect is:

aRect = (origin = (x = 0, y = 44), size = (width = 768, height = 306))

My Origin is:

ptOrigin = (x = 201, y = 313)

and i will check Like This

`if (!CGRectContainsPoint(aRect, ptOrigin) )`

{

[self.scrollView scrollRectToVisible:aRectTextView animated:YES];

}

But it gives the result origin is inside, But my Y = 313 is greater than the Height(306) of Rect then why it gives inside? So i want to know how

Answer

The logic is as follows: The point is inside iff:

`ptOrigin.x > aRect.origin.x`

and

`ptOrigin.y > aRect.origin.y`

and

`ptOrigin.x < aRect.origin.x + aRect.size.width`

and

`ptOrigin.y < aRect.origin.y + aRect.size.height`

.

In your case that results in

`201 > 0`

and

`313 > 44`

and

`201 < 0 + 768`

and

`313 < 44 + 306`

Since all 4 are true, the and-ing is true as well.