Detect collision from a rotated rectangle?

Question

I’m using the following code to know if a point is inside a rectangle:

public bool Intersect(ÍcaroDantasCollisions.Rectangle rectangle)
{
    if(x >= rectangle.x && x <= rectangle.x + rectangle.width)
    {
        if(y >= rectangle.y && y <= rectangle.y + rectangle.height)
        {
            return true;
        }
    }
    return false;
}

Obs¹: The loose x and y in the code refer to the coordinates of the point'.

Obs²: In the rectangle class only the declaration of the variables x, y, width and height are present.

Now the question, let’s say that this rectangle is rotated by 45º, how do we know if the point is colliding with it? I should necessarily use polygons?

Answer 1

I found the solution:

First you measure the angle of rotation of the rectangle from the top left, then just rotate the point in a direction contrary to the direction of the rectangle also from its origin, then just make the check as if the rectangle was not rotated :D