Description
A
Gtk_Plot_Canvas is a special kind of drawing area used with Gtk_Plot
widgets.
It provides drag-and-drop capabilities for the texts, legends, points...
available in a Gtk_Plot.
Note that this widget is specifically designed for Gtk_Plot widgets, and
won't provide any other capability for other kinds of widgets.
Like any child of Gtk_Layout, this widget can have an almost unlimited
size for its children, and provides scrolling.
Types
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type Gtk_Plot_Canvas is access all Gtk_Plot_Canvas_Record'Class;
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type Gtk_Plot_Canvas_Child is access all Gtk_Plot_Canvas_Child_Record'Class;
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type Plot_Canvas_Action is
(Action_Inactive,
Action_Selection,
Action_Drag,
Action_Resize);
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type Plot_Canvas_Flag is new Gint;
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type Plot_Canvas_Pos is
(Canvas_Out,
Canvas_In,
Canvas_Left,
Canvas_Right,
Canvas_Top,
Canvas_Bottom,
Canvas_Top_Left,
Canvas_Top_Right,
Canvas_Bottom_Left,
Canvas_Bottom_Right);
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type Plot_Canvas_Selection is
(Select_None,
Select_Markers,
Select_Target);
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type Plot_Canvas_Selection_Mode is
(Select_Click_1,
Select_Click_2);
Subprograms
Creating and manipulating the canvas
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procedure Gtk_New
(Widget : out Gtk_Plot_Canvas;
Width : Gint;
Height : Gint;
Magnification : Gdouble := 1.0);
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procedure Initialize
(Widget : access Gtk_Plot_Canvas_Record'Class;
Width : Gint;
Height : Gint;
Magnification : Gdouble := 1.0);
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procedure Refresh (Canvas : access Gtk_Plot_Canvas_Record);
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procedure Paint (Canvas : access Gtk_Plot_Canvas_Record);
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procedure Freeze (Canvas : access Gtk_Plot_Canvas_Record);
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procedure Thaw (Canvas : access Gtk_Plot_Canvas_Record);
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procedure Grid_Set_Visible
(Canvas : access Gtk_Plot_Canvas_Record;
Visible : Boolean);
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procedure Grid_Set_Step
(Canvas : access Gtk_Plot_Canvas_Record;
Step : Gdouble);
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procedure Cancel_Action (Plot_Canvas : access Gtk_Plot_Canvas_Record);
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procedure Unselect (Canvas : access Gtk_Plot_Canvas_Record);
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function Get_Active_Item
(Canvas : access Gtk_Plot_Canvas_Record)
return Gtk_Plot_Canvas_Child;
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procedure Set_Size
(Canvas : access Gtk_Plot_Canvas_Record;
Width : Gint;
Height : Gint);
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procedure Set_Magnification
(Canvas : access Gtk_Plot_Canvas_Record;
Magnification : Gdouble := 1.0);
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procedure Set_Transparent
(Canvas : access Gtk_Plot_Canvas_Record; Transparent : Boolean);
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function Transparent
(Canvas : access Gtk_Plot_Canvas_Record) return Boolean;
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procedure Set_Background
(Canvas :
access Gtk_Plot_Canvas_Record;
Background :
Gdk.Color.Gdk_Color);
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procedure Get_Pixel
(Canvas : access Gtk_Plot_Canvas_Record;
Px : Gdouble;
Py : Gdouble;
X : out Gint;
Y : out Gint);
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procedure Get_Position
(Canvas : access Gtk_Plot_Canvas_Record;
X : Gint;
Y : Gint;
Px : out Gdouble;
Py : out Gdouble);
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procedure Put_Child
(Canvas : access Gtk_Plot_Canvas_Record;
Child : access Gtk_Plot_Canvas_Child_Record'Class;
X1 : Gdouble;
Y1 : Gdouble;
X2 : Gdouble := 0.0;
Y2 : Gdouble := 0.0);
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procedure Remove_Child
(Canvas : access Gtk_Plot_Canvas_Record;
Child : access Gtk_Plot_Canvas_Child_Record'Class);
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procedure Child_Move
(Canvas : access Gtk_Plot_Canvas_Record;
Child : access Gtk_Plot_Canvas_Child_Record'Class;
X1 : Gdouble;
Y1 : Gdouble);
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procedure Child_Move_Resize
(Canvas : access Gtk_Plot_Canvas_Record;
Child : access Gtk_Plot_Canvas_Child_Record'Class;
X1 : Gdouble;
Y1 : Gdouble;
X2 : Gdouble;
Y2 : Gdouble);
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procedure Set_Selection
(Child : access Gtk_Plot_Canvas_Child_Record;
Selection : Plot_Canvas_Selection);
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procedure Set_Selection_Mode
(Child : access Gtk_Plot_Canvas_Child_Record;
Mode : Plot_Canvas_Selection_Mode);
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procedure Get_Position
(Canvas : access Gtk_Plot_Canvas_Record;
Child : access Gtk_Plot_Canvas_Child_Record'Class;
X1, Y1 : out Gdouble;
X2, Y2 : out Gdouble);
Flags
Some flags are defined for this widget. You can not access them through
the usual interface in
Gtk.Object.Flag_Is_Set since this widget is not
part of the standard gtk+ packages. Instead, use the functions below.
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function Plot_Canvas_Flag_Is_Set
(Plot_Canvas : access Gtk_Plot_Canvas_Record;
Flag : in Guint16)
return Boolean;
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procedure Plot_Canvas_Set_Flags
(Plot_Canvas : access Gtk_Plot_Canvas_Record;
Flags : in Guint16);
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procedure Plot_Canvas_Unset_Flags
(Plot_Canvas : access Gtk_Plot_Canvas_Record;
Flags : in Guint16);