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Fix: Integer overflow in LinkGraphOverlay::ShowTooltip for long links 

In particular when fully zoomed in
This could result in tooltips not being shown at all, or being shown
when not appropriate
This commit is contained in:
Jonathan G Rennison 2023-07-15 19:25:45 +01:00 committed by rubidium42
parent 756c469b8f
commit 864d2352c2
1 changed files with 2 additions and 2 deletions
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4
src/linkgraph/linkgraph_gui.cpp
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@ -369,8 +369,8 @@ bool LinkGraphOverlay::ShowTooltip(Point pt, TooltipCloseCondition close_cond)
/* Check the distance from the cursor to the line defined by the two stations. */
Point ptb = this->GetStationMiddle(Station::Get(j->first));
float dist = std::abs((ptb.x - pta.x) * (pta.y - pt.y) - (pta.x - pt.x) * (ptb.y - pta.y)) /
std::sqrt((ptb.x - pta.x) * (ptb.x - pta.x) + (ptb.y - pta.y) * (ptb.y - pta.y));
float dist = std::abs((int64)(ptb.x - pta.x) * (int64)(pta.y - pt.y) - (int64)(pta.x - pt.x) * (int64)(ptb.y - pta.y)) /
std::sqrt((int64)(ptb.x - pta.x) * (int64)(ptb.x - pta.x) + (int64)(ptb.y - pta.y) * (int64)(ptb.y - pta.y));
const auto &link = j->second;
if (dist <= 4 && link.Usage() > 0 &&
pt.x + 2 >= std::min(pta.x, ptb.x) &&