ANONYMOUS wrote:

Hi, I having trouble wrapping my head around the given answer for this question on the lms. Specifically, the part about checking if a point is within a rectangle as this is the Boolean used:

return x >= this.x && x <= this.x+width && y >= this.y && y <= this.y+height;

In this case above I tried running the example (-1,1) within a rectangle with dimensions: x = -2, y =2, height = 2 and width = 2.

-1 >= -2 is True -1 <= -2+2 is True 1 >= 2 FALSE **********************(This is the part I'm having an issue with) 1 <= 2+2 True

The point (-1,1) should be within a rectangle with these parameters correct? Or have I misinterpreted this question?

This is a quirk of programming convention that was unfortunately not specified in the question: In programming, we often do geometry in "screen coordinates" such that the origin is the top left corner of the screen, with x increasing to the right and y increasing downwards. This reverses the y-axis compared to classic Cartesian coordinates. This is why the question chose the upper-left corner as the "anchor" of the rectangle.

In classic Cartesian coordinates, you are correct, (-1, 1) is within the rectangle you specified, but not in screen coordinates.

If such a question were run in a test, any reasonable coordinate system would be accepted as a valid answer, so long as you are consistent in its use.