Routines (alphabetical) > Object Classes > Graphics Object Classes > IDLgrPolyline::Init

# IDLgrPolyline::Init

Syntax | Return Value | Arguments | Keywords | Version History

The IDLgrPolyline::Init function method initializes the polylines object.

Note: Init methods are special lifecycle methods, and as such cannot be called outside the context of object creation. This means that in most cases, you cannot call the Init method directly. There is one exception to this rule: if you write your own subclass of this class, you can call the Init method from within the Init method of the subclass.

## Syntax

Obj = OBJ_NEW('IDLgrPolyline' [, X [, Y[, Z]]] [, PROPERTY=value])

or

Result = Obj->[IDLgrPolyline::]Init([X, [Y, [Z]]] [, PROPERTY=value]) (In a lifecycle method only.)

## Return Value

When this method is called indirectly, as part of the call to the OBJ_NEW function, the return value is an object reference to the newly-created object.

When called directly within a subclass Init method, the return value is 1 if initialization was successful, or zero otherwise.

## Arguments

Note: The values specified by the X, Y, and Z arguments are used to initialize the value of the DATA property of the IDLgrPolyline object.

### X

A vector providing the X components of the points to be connected. If the Y and Z arguments are not provided, X must be an array of either two or three vectors (i.e., [2,*] or [3,*]), in which case, X[0,*] specifies the X values, X[1,*] specifies the Y values, and X[2,*] specifies the Z values. This argument is stored as double precision floating point values if the argument variable is of type DOUBLE or if the DOUBLE property is non-zero, otherwise it is stored as single precision floating point.

### Y

A vector providing the Y coordinates of the points to be connected. This argument is stored as double precision floating point values if the argument variable is of type DOUBLE or if the DOUBLE property is non-zero, otherwise it is stored as single precision floating point.

### Z

A vector providing the Z coordinates of the points to be connected. This argument is stored as double precision floating point values if the argument variable is of type DOUBLE or if the DOUBLE property is non-zero, otherwise it is stored as single precision floating point.

## Keywords

Any property listed under IDLgrPolyline Properties that contains the word “Yes” in the “Init” column of the properties table can be initialized during object creation using this method. To initialize the value of a property, specify the property name as a keyword set equal to the appropriate property value.

All other keywords are passed to the superclass of this object.

## Version History

5.0 | Introduced