I'm not a math guy, so I'm looking for concrete formulas without a lot of symbols or jargon, if possible.
I have two line segments, and need to determine if they intersect (true or false). The closest I've found is this: given coordinates of beginning and end of two intersecting line segments how do I find coordinates of their intersection? where the original poster provides a solution for the projected intersection, and from there I can compare the intersection to the x,y endpoints of one of the lines to see if it is within a line segment.
(a) is there an easier way to do this overall? I suspect I could just create a y=mx+b equation for both and solve for a common x,y value, but I'm working with screen coordinates in powerpoint and I'm not sure what to do about the b parameter since the lines are on different parts of the screen and I don't have a true 'zero' point. Also, coordinates are measured from the upper left corner, which just adds to my confusion when thinking about a traditional line formula.
(b) if I were to use the equation in the referenced post, is there an easier way to check the projected intersect against the lines, other than just comparing to see if the point is within the x and y range of one of the lines?