Demand-Supply graph: Intersection bug about econplayground HOT 2 OPEN

Since they're all lines why don't we use the y-intercept as the pivot? Or to put it another way, it pivots from the origin (0, 0) offset by the y-intercept. Translating the line in any direction would affect the y-intercept which provides a new pivot point, and changing the slope wouldn't matter at x=0.

from econplayground.

The goal is to pivot the lines at the point where they intersect. Pivoting at the y-intercept wouldn't really make sense, but maybe I'm not understanding this suggestion. I just put this bug here as a record of this issue, but if you have a proposed solution it may be easier to articulate with code.

The solution has to take into account that the user can drag the lines freely, and we have code which updates their position in the system based on that. If they were not draggable we wouldn't have this problem.

Now that I mention that, I think a possible solution is to have code to adjust the line's center point after each drag from the user. In this graph type, these lines are treated more as graphical objects than mathematical functions, so maybe we don't need math after all to solve this - I'll do some experiments.

from econplayground.