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-- Programmed by Jedidiah Barber
-- Released into the public domain
-- Arc drawing test program functionality duplicated in Ada
pragma Ada_2022;
with
FLTK.Draw,
FLTK.Widgets.Groups.Windows.Double,
FLTK.Widgets.Valuators.Sliders.Value.Horizontal;
function Arc
return Integer
is
package FDR renames FLTK.Draw;
package WD renames FLTK.Widgets.Groups.Windows.Double;
package HV renames FLTK.Widgets.Valuators.Sliders.Value.Horizontal;
-- More convenient to have these all as floats instead of integers
Arg_Values : array (Positive range <>) of aliased Long_Float :=
(140.0, 140.0, 50.0, 0.0, 360.0, 0.0);
type Drawing_Widget is new FLTK.Widgets.Widget with null record;
procedure Draw
(This : in out Drawing_Widget) is
begin
FDR.Push_Clip (This.Get_X, This.Get_Y, This.Get_W, This.Get_H);
FDR.Set_Color (FLTK.Dark3_Color);
FDR.Rect_Fill (This.Get_X, This.Get_Y, This.Get_W, This.Get_H);
FDR.Push_Matrix;
if Arg_Values (6) > 0.001 then
FDR.Translate
(Long_Float (This.Get_X) + Long_Float (This.Get_W) / 2.0,
Long_Float (This.Get_Y) + Long_Float (This.Get_H) / 2.0);
FDR.Rotate (Arg_Values (6));
FDR.Translate
(-1.0 * (Long_Float (This.Get_X) + Long_Float (This.Get_W) / 2.0),
-1.0 * (Long_Float (This.Get_Y) + Long_Float (This.Get_H) / 2.0));
end if;
FDR.Set_Color (FLTK.White_Color);
FDR.Translate (Long_Float (This.Get_X), Long_Float (This.Get_Y));
FDR.Begin_Complex_Polygon;
FDR.Arc (Arg_Values (1), Arg_Values (2), Arg_Values (3), Arg_Values (4), Arg_Values (5));
FDR.Gap;
FDR.Arc (140.0, 140.0, 20.0, 0.0, -360.0);
FDR.End_Complex_Polygon;
FDR.Set_Color (FLTK.Red_Color);
FDR.Begin_Line;
FDR.Arc (Arg_Values (1), Arg_Values (2), Arg_Values (3), Arg_Values (4), Arg_Values (5));
FDR.End_Line;
FDR.Pop_Matrix;
FDR.Pop_Clip;
end Draw;
The_Window : WD.Double_Window := WD.Forge.Create (300, 460, "Arc Testing");
The_Drawing : Drawing_Widget :=
(FLTK.Widgets.Forge.Create (The_Window, 10, 10, 280, 280)
with null record);
type My_Slider is new HV.Horizontal_Value_Slider with record
Index : Integer range Arg_Values'Range;
end record;
X_Str : aliased constant String := "X";
Y_Str : aliased constant String := "Y";
R_Str : aliased constant String := "R";
Start_Str : aliased constant String := "start";
End_Str : aliased constant String := "end";
Rotate_Str : aliased constant String := "rotate";
-- A straight up array of strings is not possible because of the different lengths
Slider_Labels : constant array (Positive range <>) of access constant String :=
(X_Str'Access, Y_Str'Access, R_Str'Access,
Start_Str'Access, End_Str'Access, Rotate_Str'Access);
-- This syntax requires Ada 2022, but it allows all overt heap usage to be avoided
Sliders : array (Positive range <>) of My_Slider :=
(for Place in Slider_Labels'Range =>
(HV.Forge.Create (The_Window, 50, 275 + Place * 25, 240, 25, Slider_Labels (Place).all)
with Index => Place));
procedure Slider_Callback
(Item : in out FLTK.Widgets.Widget'Class)
is
Slide : My_Slider renames My_Slider (Item);
begin
Arg_Values (Slide.Index) := Slide.Get_Value;
The_Drawing.Redraw;
end Slider_Callback;
begin
for Place in Sliders'Range loop
if Place <= 3 then
Sliders (Place).Set_Minimum (0.0);
Sliders (Place).Set_Maximum (300.0);
elsif Place = 6 then
Sliders (Place).Set_Minimum (0.0);
Sliders (Place).Set_Maximum (360.0);
else
Sliders (Place).Set_Minimum (-360.0);
Sliders (Place).Set_Maximum (360.0);
end if;
Sliders (Place).Set_Step_Bottom (1);
Sliders (Place).Set_Value (Arg_Values (Place));
Sliders (Place).Set_Alignment (FLTK.Align_Left);
Sliders (Place).Set_Callback (Slider_Callback'Unrestricted_Access);
end loop;
The_Window.Show_With_Args;
return FLTK.Run;
end Arc;
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