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LazUtils/Graphmath: Fix incorrect Distance() function for vertical lines. Issue #41098

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(cherry picked from commit 6ca87f810b)
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wp_xyz 2024-08-27 22:35:36 +02:00 committed by Maxim Ganetsky
parent 830ac027c9
commit a4a8978029
1 changed files with 11 additions and 4 deletions
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15
components/lazutils/graphmath.pp
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@ -685,10 +685,8 @@ var
function Slope(PT1,Pt2 : TFloatPoint) : Extended;
begin
If Pt2.X <> Pt1.X then
Result := (Pt2.Y - Pt1.Y) / (Pt2.X - Pt1.X)
else
Result := 1;
// The case Pt1.X = Pt2.X has already been handled.
Result := (Pt2.Y - Pt1.Y) / (Pt2.X - Pt1.X);
end;
function YIntercept(PT1,Pt2 : TFloatPoint) : Extended;
@ -697,6 +695,15 @@ var
end;
begin
if SP.X = EP.X then
begin
if SP.Y <> EP.Y then
Result := abs(Pt.X - SP.X)
else
Result := Distance(Pt, SP);
exit;
end;
A := -Slope(SP,EP);
B := 1;
C := -YIntercept(SP, EP);