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ada-git-code

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adainit;
Ada_Main_Program;
Function Definition: procedure Clear;
Function Body: -----------
-- Clear --
-----------
procedure Clear is
begin
Display.Hidden_Buffer (1).Set_Source (BG);
Display.Hidden_Buffer (1).Fill;
LCD_Std_Out.Clear_Screen;
LCD_Std_Out.Put_Line ("Touch the screen to draw or");
LCD_Std_Out.Put_Line ("press the blue button for");
LCD_Std_Out.Put_Line ("a demo of drawing pimitives.");
Display.Update_Layer (1, Copy_Back => True);
end Clear;
Last_X : Integer := -1;
Last_Y : Integer := -1;
type Mode is (Drawing_Mode, Bitmap_Showcase_Mode);
Current_Mode : Mode := Drawing_Mode;
begin
-- Initialize LCD
Display.Initialize;
Display.Initialize_Layer (1, ARGB_8888);
-- Initialize touch panel
Touch_Panel.Initialize;
-- Initialize button
User_Button.Initialize;
LCD_Std_Out.Set_Font (BMP_Fonts.Font8x8);
LCD_Std_Out.Current_Background_Color := BG;
-- Clear LCD (set background)
Clear;
-- The application: set pixel where the finger is (so that you
-- cannot see what you are drawing).
loop
if User_Button.Has_Been_Pressed then
case Current_Mode is
when Drawing_Mode =>
Current_Mode := Bitmap_Showcase_Mode;
when Bitmap_Showcase_Mode =>
Clear;
Current_Mode := Drawing_Mode;
end case;
end if;
if Current_Mode = Drawing_Mode then
Display.Hidden_Buffer (1).Set_Source (HAL.Bitmap.Green);
declare
State : constant TP_State := Touch_Panel.Get_All_Touch_Points;
begin
if State'Length = 0 then
Last_X := -1;
Last_Y := -1;
elsif State'Length = 1 then
-- Lines can be drawn between two consecutive points only when
-- one touch point is active: the order of the touch data is not
-- necessarily preserved by the hardware.
if Last_X > 0 then
Draw_Line
(Display.Hidden_Buffer (1).all,
Start => (Last_X, Last_Y),
Stop => (State (State'First).X, State (State'First).Y),
Thickness => State (State'First).Weight / 2,
Fast => False);
end if;
Last_X := State (State'First).X;
Last_Y := State (State'First).Y;
else
Last_X := -1;
Last_Y := -1;
end if;
for Id in State'Range loop
Fill_Circle
(Display.Hidden_Buffer (1).all,
Center => (State (Id).X, State (Id).Y),
Radius => State (Id).Weight / 4);
end loop;
if State'Length > 0 then
Display.Update_Layer (1, Copy_Back => True);