Skip to content

Latest commit

 

History

History
85 lines (61 loc) · 3.91 KB

TGraphConstraints.md

File metadata and controls

85 lines (61 loc) · 3.91 KB
Raw

TGraphConstraints = class(TPersistent)

This class has the bounding box of the graph objects on a TSimpleGraph control.

Properties

In addition to the properties of the TPersistent class, the TGraphConstraints class provides the following properties:

  • public BoundsRect: TRect
    Specifies the bounding box of the graph objects on canvas as a TRect value.

  • published MinLeft: Integer default 0
    Specifies the minimum horizontal placement of a graph object on canvas.

  • published MinTop: Integer default 0
    Specifies the minimum vertical placement of a graph object on canvas.

  • published MaxRight: Integer default 65535
    Specifies the maximum horizontal placement of a graph object on canvas.

  • published MaxBottom: Integer default 65535
    Specifies the maximum vertical placement of a graph object on canvas.

  • public Owner: TSimpleGraph (read-only)
    Gets the TSimpleGraph control that owns this instance.

Methods

In addition to the methods of the TPersistent class, the TGraphConstraints class has the following public methods:

  • procedure SetBounds(aLeft, aTop, aWidth, aHeight: Integer);
    Sets the bounding box of the graph objects on canvas.

    Parameter Description
    aLeft The minimum horizontal position
    aTop The minimum vertical position
    aWidth The maximum horizontal size
    aHeight The minimum vertical size

  • function WithinBounds(const Pts: array of TPoint): Boolean;
    Determines whether all the given coordinates satisfy the constraints.

    Parameter Description
    Pts The array of coordinates to be examined

    Returns true if all the coordinates satisfy the constraints; otherwise, return false.

  • function ConfinePt(var Pt: TPoint): Boolean;
    Moves a given coordinate inside the bounding box if it is outside of the box.

    Parameter Description
    Pt The coordinates to be confined

    Returns true if the coordinate already satisfies the constraints; otherwise, return false.

  • function ConfineRect(var Rect: TRect): Boolean;
    Shrinks a given rectangle to fit inside the bounding box if any side of it is outside of the box.

    Parameter Description
    Rect The rectangle to be confined

    Returns true if the rectangle already satisfies the constraints; otherwise, return false.

  • function ConfineMoveResize(const Rect: TRect; Mobility: TObjectSides; var dX, dY: Integer): Boolean;
    Adjusts changes in position and/or size of a rectangle, so that the rectangle stays inside the bounding box.

    Parameter Description
    Rect The rectangle
    Mobility The sides of the rectangle that can be displaced
    dX The amount of horizontal changes
    dY The amount of vertical changes

    Returns true if after applying the changes, the rectangle already satisfies the constraints; otherwise, return false.

Events

The TGraphConstraints class has the following event:

  • OnChange: TNotifyEvent
    Occurs when the value of a property has been changed.