Final answer:
The detection of a rectangle's edge overlap is determined by comparing its left and right edge coordinates with the x-coordinate of the location in question. The left edge is located at (x - rectWidth/2) and the right edge at (x + rectWidth/2). Comparisons help determine if an overlap has occurred.
Step-by-step explanation:
The question is about detecting when the left or right edge of a rectangle has been overlapped. If we're using the center mode in a graphics programming context such as Processing, the left edge of the rectangle will be located at (x - rectWidth/2) and the right edge will be at (x + rectWidth/2). To detect if the left or right edge of the rectangle has overlapped with something at a certain location, you compare its edges' position with that location's x-coordinate.
To detect a left edge overlap, check if the location's x-coordinate is less than or equal to (x - rectWidth/2). Conversely, to detect a right edge overlap, check if the location's x-coordinate is greater than or equal to (x + rectWidth/2).