Difference between revisions of "GroupTPA"
From SCAR Divi Manual
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SCAR Divi 3.28 > Current | SCAR Divi 3.28 > Current | ||
| − | *Contained a bug in | + | *Contained a bug in 3.26-3.27 that caused the initial element in every subarray of the result to be duplicated inside of that subarray. |
| − | *In | + | *In 3.26-3.27 the algorithm was implemented incorrectly and split every point of '''TPA''' up into a subarray and then included every other point within a distance of the first point in that subarray. |
===Aliases=== | ===Aliases=== | ||
| − | *TPAGroup (SCAR Divi 3.26 > | + | *TPAGroup (SCAR Divi 3.26 > 3.34) |
| − | *TPAToATPA (SCAR Divi 3.26 > | + | *TPAToATPA (SCAR Divi 3.26 > 3.34) |
==Description== | ==Description== | ||
| − | This function splits a given [[TPointArray]] '''TPA''' into separate TPointArrays, by grouping points that are within the given distance '''Dist''' of the first point of each subarray. If a point isn't within the given distance of any first point of the subarrays, a new subarray is created containing that point as first one. The function returns a [[T2DPointArray]] containing all the resulting TPointArrays. | + | This function splits a given [[TPointArray]] '''TPA''' into separate TPointArrays, by grouping points that are within the given distance '''Dist''' of the first point of each subarray. If a point isn't within the given distance of any first point of the subarrays, a new subarray is created containing that point as first one. The function returns a [[T2DPointArray]] containing all the resulting TPointArrays. An extended function with additional functionality is available as [[GroupTPAEx]]. |
==Example== | ==Example== | ||
Latest revision as of 12:06, 8 September 2012
Definition
function GroupTPA(const TPA: TPointArray; const Dist: Integer): T2DPointArray;
Availability
SCAR Divi 3.28 > Current
- Contained a bug in 3.26-3.27 that caused the initial element in every subarray of the result to be duplicated inside of that subarray.
- In 3.26-3.27 the algorithm was implemented incorrectly and split every point of TPA up into a subarray and then included every other point within a distance of the first point in that subarray.
Aliases
- TPAGroup (SCAR Divi 3.26 > 3.34)
- TPAToATPA (SCAR Divi 3.26 > 3.34)
Description
This function splits a given TPointArray TPA into separate TPointArrays, by grouping points that are within the given distance Dist of the first point of each subarray. If a point isn't within the given distance of any first point of the subarrays, a new subarray is created containing that point as first one. The function returns a T2DPointArray containing all the resulting TPointArrays. An extended function with additional functionality is available as GroupTPAEx.
Example
var
TPA: TPointArray;
ATPA: T2DPointArray;
i: Integer;
begin
ClearDebug;
TPA := [Point(2, 5), Point(6, 9), Point(0, 0), Point(5, 5), Point(1, 1), Point(5, 7), Point(-2, 0)];
ATPA := GroupTPA(TPA, 2);
for i := 0 to High(ATPA) do
WriteLn(TPAToStr(ATPA[i]));
end.Output:
(2,5) (6,9) (0,0);(1,1);(-2,0) (5,5);(5,7)
