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LazUtils: Fix calculation error in function PolyBezierArcPoints (unit GraphMath). Issue #41400. Fix typos in comments.

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wp_xyz 2025-02-03 12:08:57 +01:00
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commit 1014cd330f
1 changed files with 8 additions and 10 deletions
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18
components/lazutils/graphmath.pp
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@ -1060,19 +1060,19 @@ end;
Params: X, Y, Width, Height, Angle1, Angle2, Rotation, Points, Count
Returns: Nothing
Use PolyBezierArcPoints to convert an Agnle and AgnleLength into a
Pointer Array of TPoints for use with Polyline or Polygon.
The Rotation parameter accepts a Rotation-Angle for a rotated Ellipse'- for
Use PolyBezierArcPoints to convert an arc between two angles Angle1 and Angle2
into a pointer array of TPoints for use with Polyline or Polygon.
The Rotation parameter accepts a rotation angle for a rotated ellipse - for
a non-rotated ellipse this value would be 0, or 360*16.
The result is an Aproximation based on 1 or more Beziers. If the AngleLength
is greater than 45*16 degrees, it recursively breaks the Arc into Arcs of
45*16 degrees or less, and converts them into Beziers with BezierArcPoints.
The result is an approximation based on 1 or more Beziers. If the angle length
is greater than 45*16 degrees, it recursively breaks the arc into arcs of
45*16 degrees or less, and converts them into beziers with BezierArcPoints.
The angles are 1/16th of a degree. For example, a full circle equals
5760 (16*360).
Positive values of Angle and AngleLength mean counter-clockwise while negative
Positive values of Angle1 and Angle2 mean counter-clockwise while negative
values mean clockwise direction. Zero degrees is at the 3'o clock position.
Points is automatically initialized, so any existing information is lost,
and the array starts at 0. Points should ALWAYS be Freed when done by calling
and the array starts at 0. Points should ALWAYS be freed when done by calling
to ReallocMem(Points, 0).
------------------------------------------------------------------------------}
@ -1087,8 +1087,6 @@ begin
Angle2 := 360*16;
Angle1 := 0;
end;
If Abs(Rotation) > 360*16 then
Rotation := Frac(Rotation / 360*16)*360*16;
FullAngle := Angle1 + Angle2;
K := Ceil(ABS(Angle2/16) / 45);
Count := 0;