paweld/lazarus
1
0
Fork 0
mirror of https://gitlab.com/freepascal.org/lazarus/lazarus.git synced 2025-08-10 19:18:14 +02:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source
This commit is contained in:
wp_xyz 2024-08-27 22:35:36 +02:00
parent 6d66b7be1d
commit 6ca87f810b
1 changed files with 11 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
components/lazutils/graphmath.pp
View File

@ -689,10 +689,8 @@ 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;
@ -701,6 +699,15 @@ 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);