HISTORY.md

Version 2.92 (July 25, 2022)

• Fixed bug in the ForEachObject method of the TSimpleGraph control. The method was always returning zero.
• Renamed the ContainsRect method of the TGraphObject class to IntersectsWith for sake of clarity.
• Renamed the TGraphNodeResizeEvent event type to TGraphNodeNotifyEvent.
• Refactored the code.
• Improved the documentation.

Version 2.91 (January 25, 2013)

• Fixed a bug in wrapping text (Thanks to Oleg).

Version 2.90 (April 27, 2013)

• Fixed the bug causing some random characters appear on the caption of links.
• Improved positioning of the links' caption.

Version 2.81 (January 6, 2013)

• Fixed the compatibility issues with Delphi XE2 and XE3.

Version 2.80 (June 2, 2011)

• Added the gloFixedAnchorStartPoint and gloFixedAnchorEndPoint options to the LinkOptions property of the TGraphLink class. These options determine whether the hooked links should be anchored to a fixed point on the target object or not.

Version 2.72 (February 2, 2009)

• Fixed code malfunction in changing the Left, Top, Width, and Height properties of the TGraphNode class inside a BeginUpdate/EndUpdate block.

Version 2.71 (January 16, 2009)

• Re-entrance problem in repositioning of hooked objects is fixed (Thanks to cml0816).
• Problem in selecting horizontal and vertical links with one pixel width is fixed (Thanks to cml0816).
• Added the Push and Pop methods to the TGraphObjectList class.

Version 2.70 (November 14, 2008)

• Fixed compatibility issue with Delphi 2009.
• Fixed bug in the NormalizeBreakPoints method of the TGraphLink class (Thanks to liu8670).
• Fixed bug in the ZoomRect method of the TSimpleGraph control (Thanks to Choe, Cheng-Dae).

Version 2.62 (May 15, 2007)

• Fixed the compatibility issue with Delphi 5.

Version 2.61 (March 30, 2006)

• Fixed a bug in managing mouse, which was occurred when the CommandMode property was set to cmViewOnly.

Version 2.60 (March 29, 2006)

• Added the OnObjectMouseEnter and OnObjectMouseLeave events to the TSimpleGraph control.
• Added the DragSource and ObjectAtCursor properties to the TSimpleGraph control.
• Added the ResizeSelection method to the TSimpleGraph control.

Version 2.50 (March 26, 2006)

• Introduced the OverlappedRect global procedure.
• Added the Transparent property to the TSimpleGraph control.
• Added the ChangeZoom, ChangeZoomBy, and AlignSelection methods to the TSimpleGraph control.
• Fixed a bug in drawing child controls.
• Fixed a bug in calculating range of scroll bars when the control had some aligned child controls.

Version 2.40 (March 22, 2006)

• Fixed a bug in scrolling the graph by keyboard.
• Fixed a bug in the Assign method of the TGraphObjectList class.

Version 2.30 (March 21, 2006)

• Introduced the TCompatibleCanvas class.
• Introduced cmPan as a new option for the CommandMode property of the TSimpleGraph control.
• Added the OnMoveResizeNode event to the TSimpleGraph control.
• Fixed a bug in the FindObjectAt method of the TSimpleGraph control.
• Fixed a bug in triggering some events while loading or clearing a graph.

Version 2.20 (March 19, 2006)

• Added the SourceRect property to the TGraphConstraints class.
• Fixed a bug in merging graphs.

Version 2.10 (March 18, 2006)

• Introduced the TCanvasRecall class.
• Added the UnionRect and IntersectRect global procedures.
• Added the ClipboardFormats, DraggingObjects, and DraggingBounds properties to the TSimpleGraph control.
• Added the ScrollCenter, ScreenToGraph, GraphToScreen, SnapPoint, SnapOffset, FindObjectByID, ForEachObject, SaveAsBitmap, CopyToGraphic, MergeFromStream, MergeFromFile, and InvalidateRect methods to the TSimpleGraph control.
• Added OnObjectInitInstance, OnObjectChange, OnCanRemoveObject, OnObjectRead and OnObjectWrite events to the TSimpleGraph control.
• Added the ID, Data, States, HasCustomData, VisualRect, SelectedVisualRect, Dependents, DependentCount, LinkInputs, LinkInputCount, LinkOutputs, and LinkOutputCount properties to the TGraphObject class.
• Added the CanDelete, DragBy, and Invalidate methods to the TGraphObject class.
• Added the missing AssignTo method to the TGraphObject class.
• Added the IsNode class method to the TGraphObject class.
• Added the Create constructor to the TGraphObject class.
• Added the CreateNew constructor to the TGraphLink class.
• Added the CreateNew constructor to the TGraphNode class.
• Changed signature of the BeginDrag and DragTo methods of the TGraphObject class.
• Changed the return value of the ConvertTo method of the TGraphObject class.
• Changed the TGraphObjectList class. The new implementation provides safe enumeration of the graph objects even when the list is changed during the enumeration.
• Changed the OnObjectBeginDrag and OnObjectEndDrag events of the TSimpleGraph control, so that more information about the dragging object be available.
• Changed zooming properties of the TSimpleGraph control. The current zoom range is between 5% and 36863%. Because of the new OnMouseWheelDown and OnMouseWheelUp events of the control, the control does not change the zoom factor internally. Due to these changes, ZoomMin, ZoomMax, and ZoomStep properties of the control are removed.
• Changed signature of the FindObjectAt method of the TSimpleGraph control.
• Improved painting algorithm to increase speed and reduce CPU usage.
• Fixed a bug in moving a group of selected link objects.
• Fixed a bug in inserting links, which were occurring in Delphi 4 and 5.
• Fixed the bug about not triggering the OnObjectUnhook event of the TSimpleGraph control when unhooking was the result of an object deletion.
• Fixed a bug in saving the BackgroundMargins property of the TGraphObject class.
• Fixed a bug in the MinimizeText global procedure. In addition, three periods as ellipsis (...) is changed to a single character ellipses (…) if the font supports it.
• Fixed a bug regarding positioning of the links.
• Fixed some minor other bugs.
• And, many other improvements in the stability and performance of the code.

Version 2.00 (February 23, 2006)

To improve performance and functionality of the control, most part of the code is rewritten. This may lead to some breaking changes in your code.

Changes in the TSimpleGraph class:

• Added the LockLinks property.
• Added the OnObjectBeginDrag and OnObjectEndDrag events.
• Added the OnObjectHook and OnObjectUnhook events.
• Added the OnCanHookLink event.
• Replaced the OnCanLinkNodes event with the OnCanLinkObjects event.
• Replaced the ToggleNodesAt method with the ToggleSelection method. The new method is more flexible and detects objects that are either inside or intersecting with the selection rectangle.
• Added an overload for the FindObjectAt method.
• Changed Bounds parameter of the InsertNode method from PRect to TRect.
• Replaced the LinkNodes method with the InsertLink method. The new method has four overloads.
• Added the ClearSelection method.
• Renamed the cmLinkNodes value of the CommandMode property to cmInsertLink.
• Removed the IsValidLink method. Use the CanLink method of the TGraphLink class as substitute.
• Changed some keyboard and mouse actions. As of now, each object has its own keyboard and mouse events.
• Added the missing constraints check while moving/resizing objects by keyboard.

Changes in the [TGraphObject] class:

• Added the Options property.
• Added the Dragging property as read-only.
• Added the BeginDrag, DragTo, and EndDrag methods.
• Added the HitTest method.
• Added the ContainsRect method.
• Added the Delete method.
• Added the IsLocked method.
• Changed the IsLink property to class method.

Changes in the TGraphLink class:

• Improved functionality. Each endpoint of a link can be hooked to a graph object (node or link), and style of each endpoint is customizable. The new links can have breakpoints.
• Added the Points, PointCount, and Polyline properties.
• Added the TextPosition and TextSpacing properties.
• Added the LinkOptions property.
• Replaced the Kind property with the BeginStyle and EndStyle properties.
• Replaced the ArrowSize property with the BeginSize and EndSize properties.
• Replace the FromNode and ToNode properties with the Source and Target properties.
• Added the CanMove method.
• Added the AddPoint, InsertPoint, RemovePoint, IndexOfPoint, AddBreakPoint, and NormalizeBreakpoints methods for manipulating the Polyline property.
• Added the IsFixedPoint, IsHookedPoint, HookedObjectOf, HookedIndexOf, and HookedPointCount methods.
• Added the CanHook, Hook, Unhook, CanLink, and Link methods for managing the hooking and linking actions.
• Added the Rotate and Scale methods.

Changes in the TGraphNode class:

• Added the NodeOptions property.
• Added the BackgroundMargins property.
• Added the CanMoveResize method.
• Removed the QueryLinkTo method.
• Fixed clipped text problem that was occurring when graph was zoomed in.
• Introduced the Hexagonal node shape.

Changes in the TPolygonalNode class:

• Added the Vertices property as read-only.

Changes in the TRectangularNode class:

• Changed the base class from the TGraphNode class to the TPolygonalNode class.

Changes in the TGraphConstraints class:

• Added the WithinBounds method.
• Added the ConfineOffset method.
• Changed signature of ConfinePt and ConfineRect methods.
• Fixed malfunction of the ConfineRect method.

Changes in global procedures:

• Added the NormalizeAngle, EqualPoint, ScalePoints, ShiftPoints, MakeSquare, LineLength, NearestPointOnLine, and IntersectLinePolyline functions.
• Changed signature of the IntersectLineRect, IntersectLineEllipse, IntersectLineRoundRect, and IntersectLinePolygon functions.
• Changed the return type of the DistanceToLine function from integer to double.
• Changed type of DistanceFromThisPt parameter of the NextPointOfLine function from integer to double.

Version 1.67 (November 14, 2005)

• Added the OnZoomChange event the TSimpleGraph control.
• Fixed bug on calling the OnResize and OnCanResize events of the TSimpleGraph control.

Version 1.66 (November 11, 2005)

• Added the FixedScrollBars property to the TSimpleGraph control.
• Applied constrains check on the new nodes inserted by mouse actions.
• Added the ConfinePt and ConfineRect methods to the TGraphConstraints class.

Version 1.65 (November 10, 2005)

• Introduced the TGraphConstraints class.
• Replaced the FreezeTopLeft property of the TSimpleGraph control with the GraphConstraints property.
• Added missing OnClick and OnObjectClick to the TSimpleGraph control.
• Improved paint handler to remove memory limit on graph's bounds and speed up drawing.
• The TSimpleGraph control accepts child controls now.

Version 1.61 (November 1, 2005)

• Added the OnInfoTip event to the TSimpleGraph control.
• Introduced the NearestPoint global procedure.
• Changed all Extended data types to Double to prevent "Invalid Floating Point Operation" exception.
• Fixed the bug in calculating the end points of the links.
• Dropped the limit on the number of allowed polygon's vertices in the TPolygonalNode class.

Version 1.60 (October 29, 2005)

• Added the Layout property to the TGraphNode class.
• Added the DrawOrder property to the TSimpleGraph control.
• Added OnBeforeDraw, OnAfterDraw, OnObjectBeforeDraw, and OnObjectAfterDraw to the TSimpleGraph control.
• Introduced the WrapText and MinimizeText global procedures.
• Displayed caption of objects as hint if the caption does not fit on the screen.
• Fixed issue with drawing caption of nodes for zoom factors other than 100%.
• Some minor tweaks.

Version 1.58 (September 29, 2005)

• Added the Hint property to the TGraphObject class.

Version 1.57 (May 13, 2005)

• Workaround a Windows API bug. If the view size of a metafile image is larger than the screen size, Windows API cannot clip it.

Version 1.56 (May 9, 2005)

• Fixed bug in copy/paste functions.

Version 1.55 (April 21, 2005)

• Fixed memory leak issue.

Version 1.54.2 (August 24, 2004)

• Fixed the black border artifact, which was appearing during scroll.

Version 1.54.1 (August 20, 2004)

• Fixed bug in calculating range of the scroll bars.

Version 1.54 (August 6, 2004)

• Added the MinNodeSize property the TSimpleGraph control.
• Added the ArrowSize to the TGraphLink class.
• Some minor tweaks.

Version 1.53.1 (August 4, 2004)

• Fixed bug related to the FreezeTopLeft property of the TSimpleGraph control.

Version 1.53 (August 4, 2004)

• Fixed bug in moving/resizing overlapped objects.
• Added the FreezeTopLeft property to the TSimpleGraph control.

Version 1.52 (July 18, 2004)

• Fixed the scrolling malfunction when the zoom was greater than 100%.

Version 1.51 (June 28, 2004)

• Fixed a minor bug.

Version 1.50 (June 22, 2004)

• Added the VisibleBounds property to the TSimpleGraph control.
• Introduced the abstract TPolygonalNode class.
• Introduced the Triangular, Rhomboidal, and Pentagonal node shapes.
• Added some new global functions.
• Improved performance.

Version 1.21.1 (June 18, 2004)

• Fixed the compiler error on Delphi 4.

Version 1.21 (June 13, 2004)

• Added the SelectionBounds property to the TSimpleGraph control.
• Added the ZoomRect, ZoomObject, ZoomSelection, and ZoomGraph to the TSimpleGraph control.
• Added the missing GraphToClient method to the TSimpleGraph control.
• Some minor tweaks.

Version 1.20 (June 12, 2004)

• Introduced the zooming capabilities. As the result, the Zoom, ZoomMin, ZoomMax and ZoomStep properties are added to the TSimpleGraph control.
• Added the ClientToGraph method to the TSimpleGraph control.

Version 1.10 (May 16, 2004)

• Added the Kind property to the TGraphLink class.
• Renamed the LinkTypeTo method of TGraphNode class to QueryLinkTo. Also, improved its functionality.

Version 1.09 (May 9, 2004)

• Smashed some bugs.

Version 1.08 (May 10, 2003)

• Fixed the division by zero exception in calculating the distance of a point from a line.

Version 1.07 (April 27, 2003)

• Added the Backgroundproperty to the TGraphNode class.

Version 1.06 (April 23, 2003)

• Added the Print and SaveAsMetafile methods to the TSimpleGraph control.
• Removed the PaintTo method of the TSimpleGraph control.
• Add the HideSelection property to the TSimpleGraph control.

Version 1.05 (April 21, 2003)

• Added the Alignment and Margin properties to the TGraphNode class.

Version 1.04 (April 21, 2003)

• Polished the code for the initial public domain release.

Version 1.03 (August 27, 2000)

• Fixed issue in finding the intersection of a line and a round rectangle.

Version 1.02 (August 22, 2000)

• Fixed bug in movement of links.

Version 1.01 (July 01, 2000)

• Fixed the wrong behavior of the control when nodes were locked.

Version 1.00 (June 11, 2000)

• Initial release.