GAP (Francy) - Chapter 3: Francy Canvas

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3 Francy Canvas

A Canvas is an area where the graphics representation of Francy live.

Please see Francy-JS for client implementation.

3.1 Categories

In this section we show all Francy Canvas Categories.

3.1-1 IsCanvas

‣ IsCanvas( arg ) ( filter )

Returns: true or false

Identifies Canvas objects.

3.1-2 IsCanvasDefaults

‣ IsCanvasDefaults( arg ) ( filter )

Returns: true or false

Identifies CanvasDefaults objects.

3.2 Families

In this section we show all Francy Canvas Families.

3.3 Representations

In this section we show all Francy Canvas Representations.

3.3-1 IsCanvasRep

‣ IsCanvasRep( arg ) ( filter )

Returns: true or false

Checks whether an Object has a Canvas internal representation.

3.3-2 IsCanvasDefaultsRep

‣ IsCanvasDefaultsRep( arg ) ( filter )

Returns: true or false

Checks whether an Object has a CanvasDefaults internal representation.

3.4 Operations

In this section we show all Francy Canvas Operations.

3.4-1 Canvas

‣ Canvas( IsString(title)[, IsCanvasDefaults] ) ( operation )

Returns: Canvas

A Canvas represents the base element where rendering happens. This object is inspired by the HTML canvas tag element, which is used to draw graphics in runtime via JavaScript. Examples:

Create a simple Canvas:

gap> canvas := Canvas("");
gap> Id(canvas);
gap> SetTitle(canvas, "Quaternion Group Subgroup Lattice");
gap> Title(canvas);
gap> SetHeight(canvas, 400); # default 600
gap> Height(canvas);
gap> SetWidth(canvas, 400); # default 800
gap> Width(canvas);
gap> SetZoomToFit(canvas, false); # default true
gap> ZoomToFit(canvas);
gap> Draw(canvas);

3.4-2 Add

‣ Add( IsCanvas[, IsFrancyGraph, List(IsFrancyGraph)] ) ( operation )

Returns: Canvas

Adds a FrancyGraph to a specific Canvas. Well, the api is abstract enough to allow Adding a list of IsFrancyGraph to a canvas, but this results in setting the graph property only to the last IsFrancyGraph in the list.

3.4-3 Remove

‣ Remove( IsCanvas[, IsFrancyGraph, List(IsFrancyGraph)] ) ( operation )

Returns: Canvas

Removes a FrancyGraph from a Canvas.

3.4-4 Add

‣ Add( IsCanvas[, IsChart, List(IsChart)] ) ( operation )

Returns: Canvas

Adds a Chart to a specific Canvas. Well, the api is abstract enough to allow Adding a list of IsChart to a canvas, but this results in setting the graph property only to the last IsChart in the list.

3.4-5 Remove

‣ Remove( IsCanvas[, IsChart, List(IsChart)] ) ( operation )

Returns: Canvas

Removes a Chart from a Canvas.

3.4-6 Add

‣ Add( IsCanvas[, IsMenu, List(IsMenu)] ) ( operation )

Returns: Canvas

Adds a Menu to a specific Canvas.

3.4-7 Remove

‣ Remove( IsCanvas[, IsMenu, List(IsMenu)] ) ( operation )

Returns: Canvas

Removes a Menu from a Canvas.

3.4-8 Add

‣ Add( IsCanvas[, IsFrancyMessage, List(IsFrancyMessage)] ) ( operation )

Returns: IsCanvas

Adds a FrancyMessage to a specific IsCanvas.

3.4-9 Remove

‣ Remove( IsCanvas[, IsFrancyMessage, List(IsFrancyMessage)] ) ( operation )

Returns: IsCanvas

Removes a FrancyMessage from a specific IsCanvas.

3.4-10 Add

‣ Add( IsCanvas[, IsFrancyRenderer, List(IsFrancyRenderer)] ) ( operation )

Returns: IsCanvas

Adds a FrancyRenderer to a specific IsCanvas.

3.4-11 Remove

‣ Remove( IsCanvas[, IsFrancyRenderer, List(IsFrancyRenderer)] ) ( operation )

Returns: IsCanvas

Removes a FrancyRenderer from a specific IsCanvas.

3.4-12 Draw

‣ Draw( IsCanvas ) ( operation )

Returns: rec with the JSON metadata model representation of the Canvas

Generates the JSON metadata model representation of the Canvas object and all children objects.

3.4-13 DrawSplash

‣ DrawSplash( IsCanvas ) ( operation )

Returns: IsString with HTML generated

Generates an HTML page with an offline version od Francy JS and opens it within the default browser of the system.

3.5 Global

In this section we show all Global Francy Canvas Records for multi purpose.

3.6 Attributes

In this section we show the Francy Attributes.

3.6-1 Width

‣ Width( arg ) ( attribute )

Returns: IsPosInt

The Width of the Canvas in pixels IsPosInt.

3.6-2 Width

‣ Width( arg1 ) ( operation )

3.6-3 SetWidth

‣ SetWidth( IsCanvas, IsPosInt ) ( operation )

Sets the Width of the Canvas in pixels IsPosInt.

3.6-4 Height

‣ Height( arg ) ( attribute )

Returns: IsPosInt

The Height of the Canvas in pixels IsPosInt.

3.6-5 Height

‣ Height( arg1 ) ( operation )

3.6-6 SetHeight

‣ SetHeight( IsCanvas, IsPosInt ) ( operation )

Sets the Height of the Canvas in pixels IsPosInt.

3.6-7 ZoomToFit

‣ ZoomToFit( arg ) ( attribute )

Returns: IsBool True if enabled otherwise False

ZoomToFit is a property that sets the objects within the Canvas to fit within the GUI visible area, after rendering in the client implementation.

3.6-8 ZoomToFit

‣ ZoomToFit( arg1 ) ( operation )

3.6-9 SetZoomToFit

‣ SetZoomToFit( IsCanvas, IsBool ) ( operation )

ZoomToFit is a property that sets the objects within the Canvas to fit within the GUI visible area.

3.6-10 Title

‣ Title( arg ) ( attribute )

Returns: IsString with the title of the object

The Canvas title to show on the GUI.

3.6-11 Title

‣ Title( arg1 ) ( operation )

3.6-12 SetTitle

‣ SetTitle( IsCanvas, IsString ) ( operation )

Sets the title of the Canvas.

3.6-13 TexTypesetting

‣ TexTypesetting( arg ) ( attribute )

Returns: IsBool with the title of the object

Enables usage of TeX Typesetting on the client implementation, if supported.

3.6-14 TexTypesetting

‣ TexTypesetting( arg1 ) ( operation )

3.6-15 SetTexTypesetting

‣ SetTexTypesetting( IsCanvas, IsBool ) ( operation )

Sets TeX Typesetting on the canvas objects.

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