F_VN_ApproximatePolygon

F_VN_ApproximatePolygon 1:

Approximate a contour to a simplified polygon (using the Douglas-Peucker algorithm).

Syntax

Definition:

FUNCTION F_VN_ApproximatePolygon : HRESULT
VAR_INPUT
    ipSrcContour  : ITcVnContainer;
    ipDestContour : Reference To ITcVnContainer;
    fMaxDist      : LREAL;
    bClosed       : BOOL;
    hrPrev        : HRESULT;
END_VAR

F_VN_ApproximatePolygon 2: Inputs

Name

Type

Description

ipSrcContour

ITcVnContainer

Single contour (ContainerType_Vector_TcVnPoint2_DINT or ContainerType_Vector_TcVnPoint2_REAL; The elements of this container are the points of the contour.)

ipDestContour

Reference To ITcVnContainer

Returns a container which is filled with the approximated polygon points (same type ID as ipSrcContour; Non-zero interface pointers are reused.)

fMaxDist

LREAL

Maximum distance between the original contour and its approximation

bClosed

BOOL

Specify, if the contour is closed (first and last points connected) or not

hrPrev

HRESULT

HRESULT indicating the result of previous operations (If SUCCEEDED(hrPrev) equals false, no operation is executed.)

F_VN_ApproximatePolygon 3: Return value

HRESULT

Required License

TC3 Vision Base

System Requirements

Development environment

Target platform

PLC libraries to include

TwinCAT V3.1.4024.54 or later

PC or CX (x64) with PL50, e.g. Intel 4-core Atom CPU

Tc3_Vision