References ▼
#include "ltwrappr.h"
virtual L_INT LVectorEllipse::LockObject(pEllipse)
Gets the object information of the class object.
Pointer to a VECTORELLIPSE structure to be updated with the vector object information.
| Value | Meaning |
|---|---|
| SUCCESS | The function was successful. |
| < 1 | An error occurred. Refer to Return Codes. |
This function is used to retrieve the object information of the class object.
To use this method, declare a variable of the VECTORELLIPSE type and pass the address to this function. After modifying the vector object settings, call LVectorEllipse::UnlockObject (). LVectorEllipse::LockObject () and LVectorEllipse::UnlockObject () should always be called in pairs.
Before an object has been added to the LVectorBase object, using LVectorBase::AddObject or LVectorLayer::AddObject, LVectorEllipse::UnlockObject () can be used to change ALL properties of an object. However, once the object has been added to the LVectorBase object, some properties cannot be changed using LVectorEllipse::UnlockObject ().However, as long as the number of points does not change, the coordinates of the individual points can always be modified using LVectorEllipse::UnlockObject ().
To change the object information for a class object, call LVectorEllipse::UnlockObject.
LVectorEllipse::LockObject and LVectorEllipse::UnlockObject must be called in pairs.
Note that rotating an object may change the object type. However, not all object types are changed by rotation, and not all rotations result in changing an object type. For example, a rectangle rotated 90 degrees about the z-axis is still a rectangle. A rectangle rotated 45 degrees about the z-axis becomes a polydraw object. The table below indicates object types that may change following rotation and the possible resulting object types.
| Original object type | Possible object type following rotation |
|---|---|
| VECTOR_RECTANGLE | VECTOR_POLYGON |
| VECTOR_ELLIPSE | VECTOR_POLYDRAW |
| VECTOR_CIRCLE | VECTOR_POLYDRAW |
| VECTOR_ARC | VECTOR_POLYDRAW |
| VECTOR_TEXT | VECTOR_POLYDRAW |
| VECTOR_PIE | VECTOR_POLYDRAW |
If an object type changes, LVectorEllipse::LockObject and LVectorEllipse::UnlockObject will return WRPERR_VECTOR_INVALID_OBJECT_TYPE. Object properties can still be inspected and changed by using LVectorObject::GetObjectAttributes and LVectorObject::SetObjectAttributes.
Required DLLs and Libraries
This example will add a new green ellipse to the Active Layer LVectorBase object
Once added, the color will be changed to blue
L_INT LVectorEllipse__LockObjectExample(HWND hWnd, LVectorBase *pVector){UNREFERENCED_PARAMETER(hWnd);L_INT nRet;VECTORELLIPSE Ellipse;Ellipse.Point.x = 50;Ellipse.Point.y = 50;Ellipse.Point.z = 0;Ellipse.Pen.bExtPen = FALSE;Ellipse.Pen.nSize = sizeof( VECTORPEN );Ellipse.Pen.NewPen.LogPen.lopnStyle = PS_SOLID;Ellipse.Pen.NewPen.LogPen.lopnWidth.x = 2;Ellipse.Pen.NewPen.LogPen.lopnWidth.y = 2;Ellipse.Pen.NewPen.LogPen.lopnColor = RGB(0,255,0);Ellipse.Brush.VectorBrushStyle = VECTORBRUSH_STANDARD;Ellipse.Brush.nSize = sizeof(VECTORBRUSH);Ellipse.Brush.BrushType.StandardBrush.LogBrush.lbColor = RGB(0,255,0);Ellipse.Brush.BrushType.StandardBrush.LogBrush.lbStyle = BS_SOLID;Ellipse.xRadius = 40;Ellipse.yRadius = 25;LVectorEllipse VectorEllipse(&Ellipse);// add to current active layerLVectorLayer VectorLayer;nRet = pVector->GetActiveLayer(&VectorLayer);if (nRet == SUCCESS){nRet = VectorLayer.AddObject(&VectorEllipse);if(nRet != SUCCESS)return nRet;//Now change color to blueMessageBox(NULL, TEXT("Changing pen color to blue"), TEXT(""), MB_OK);VECTORELLIPSE EllipseTemp;nRet = VectorEllipse.LockObject(&EllipseTemp);if(nRet != SUCCESS)return nRet;EllipseTemp.Pen.bExtPen = FALSE;EllipseTemp.Pen.NewPen.LogPen.lopnColor = RGB(0,0,255);nRet = VectorEllipse.UnlockObject(&EllipseTemp);if(nRet != SUCCESS)return nRet;}else{MessageBox(NULL, TEXT("No Active Layer--Load a vector and run again"), TEXT(""), MB_OK);return nRet;}//LVectorEllipse destructor called when VectorEllipse goes out of scopereturn SUCCESS;}