C.2.20 4D CAD 1.2.7

• (526) DXF polylines with embedded circle-arcs are now imported as polyline segments and circle-arcs.
  
  
• (527) Defined and implemented CADGetBlockAddedSnaps and CADSetBlockAddedSnaps . This adds custom snaps to a block.

  For an added snap to be active:

  • it must be within the draw bounds of the block
  • the layer of the insert object that places the block, must have snaps enabled.

  The main drawing block (kCADRootBlockID) can not have snaps added.

  For the new snap type, CADFindSnap returns kCADSnapAddedToBlock in theSnapType.

  Note

  • In the current implementation, if thousands of snaps are added to a block, 4D CAD will get slow
  • If you need a drawing grid, don’t use added snaps, but place a block with grid lines on a background layer and set theBlockSnapMask to kCADActivateSnapByCrossing

  Added snaps are stored with the drawing.
  
  

• (528) Defined and implemented CADGetBlockSnapMask and CADSetBlockSnapMask , where theBlockSnapMask uses the following constants:

  kCADActivateAllSnaps , kCADActivateNoSnap , kCADActivateSnapByFilledGrip , kCADActivateSnapByOpenGrip , kCADActivateSnapByBlip , kCADActivateSnapByGripOrBlip , kCADActivateSnapByCrossing , kCADActivateSnapByObj or kCADActivateSnapAddedToBlock .

  The main drawing block (kCADRootBlockID) does accept a snap mask.

  Snap masks of inserted blocks consist of a recursive logical AND of the mask of host block and the masks of the inserted blocks.
  
  

• (529) Changed the parameter list of CADFindCrossing to include a new parameter theUseSnapMasksFlag.

  Renamed CADFindCrossing to CADFindCrossings .
  
  

• (530) The mouse scroll wheel can be used for zooming in and out, when using 4D 2003 or a later version.

  Parameter theEventData4 of CADOnEvent for kCADEventIDZoom contains the zoom increment.