Manipulating Objects or Vertices within a Vector Image

LEADTOOLS provides functions for working with individual objects within the vector image.

• LVectorBase::EnumObjects
• LVectorBase::EnumVertices

Calling these functions enumerates through all vertices/objects in a vector.

To use these, the programmer must

1. Derive a class from LVectorBase.

2. Override the corresponding virtual function:

   • LVectorBase::EnumObjectsCallBack
   • LVectorBase::EnumVerticesCallBack

   In the override, you can use the following member functions to test to see if a particular object is inside a rectangle or parallelogram, delete an object, select/deselect an object, test to see if an object is selected, get the object under a two-dimensional point, determine whether hidden objects exist in the vector handle, or get the object bounds.

   • LVectorBase::IsObjectInsideParallelogram
   • LVectorBase::IsObjectInsideRect
   • LVectorBase::DeleteObject
   • LVectorBase::IsObjectHidden
   • LVectorBase::HitTest
   • LVectorBase::GetObjectParallelogram
   • LVectorBase::GetObjectRect
   • LVectorBase::LogicalToPhysical

3. Before calling EnumObjects() or EnumVertices(),call the member function LBase::EnableCallBack(TRUE);

   When manipulating individual vertices, the following affect how the vertices of the image bind with each other:

   • LVectorBase::SetBindVerticesMode
   • LVectorBase::GetBindVerticesMode