How to check if a sprite is visible within a view ?

[Tigrou]

Hi all,
I am a beginner with SFML and have a question.

Let's say I have a game with a scrollable view.

Is there a simple way using SFML to check if a given sprite (eg : an enemy) is visible within a view ? By visible I mean the sprite can be seen with the current scroll values, not that it is occluded by another sprite.

I have same problem with mouse : how to check that a the mouse cursor is inside a view ?

[Turbine]

Just use some math.

Something along the lines of (this isn't code):
if (object.x > view.x && object.y > view.y && object.x < view.x + view.width && object.y < view.y + view.height)

It's just to give you an idea of how you could achieve it. Obviously you'd make functions and what not for handling such things in a more generic and reusable way.

[JayhawkZombie]

try sf::Rect::Intersects https://www.sfml-dev.org/documentation/2.4.2/classsf_1_1Rect.php#a566740c8f58e01bb052266f47e7e1011

sf::FloatRect View;
...

auto rect = sprite.getGlobalBounds();
if (rect.intersects(View))
...

[Tigrou]

@JayhawkZombie :
Thanks.

I have solved the problem for checking the if the mouse cursor is inside view (but not for the sprite) :

IntRect viewport = window.GetViewport(myView);
Vector2i mousePosition = ...
if (viewport.Contains(mousePosition))
{
  //...
}

[Hapax]

I have solved the problem for checking the if the mouse cursor is inside view (but not for the sprite) :

rect.contains(point)

is for testing if a point (such as the position of the mouse cursor) is inside the rectangle:
http://www.sfml-dev.org/documentation/2.4.2/classsf_1_1Rect.php#a24163acdb9b2987c0ea55c201e270d41

rect.intersects(rect)

is for testing if two rectangles (such as a sprite bounding box and a view rectangle) overlap:
http://www.sfml-dev.org/documentation/2.4.2/classsf_1_1Rect.php#a566740c8f58e01bb052266f47e7e1011

Did JayhawkZombie's solution not work for you?