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ada_gui-gnoga-gui-element-canvas-context_2d.adb
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-- Ada_GUI implementation based on Gnoga. Adapted 2021
-- --
-- GNOGA - The GNU Omnificent GUI for Ada --
-- --
-- G N O G A . G U I . E L E M E N T . C A N V A S . C O N T E X T _ 2 D --
-- --
-- B o d y --
-- --
-- --
-- Copyright (C) 2014 David Botton --
-- --
-- This library is free software; you can redistribute it and/or modify --
-- it under terms of the GNU General Public License as published by the --
-- Free Software Foundation; either version 3, or (at your option) any --
-- later version. This library is distributed in the hope that it will be --
-- useful, but WITHOUT ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are --
-- granted additional permissions described in the GCC Runtime Library --
-- Exception, version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- For more information please go to http://www.gnoga.com --
------------------------------------------------------------------------------
with Ada.Strings.Fixed;
with Ada.Strings.Unbounded;
with Ada.Numerics;
with Ada.Text_IO;
with Ada_GUI.Gnoga.Server.Connection;
with Parsers.Multiline_Source.XPM;
with Parsers.Multiline_Source.Text_IO;
package body Ada_GUI.Gnoga.Gui.Element.Canvas.Context_2D is
procedure Data (Image_Data : in out Image_Data_Type; Value : in String);
function Data (Image_Data : Image_Data_Type) return String;
-- Raw data transfer of pixel data from Browser
function String_To_Pixel_Data (Value : String; Width, Height : Positive)
return Gnoga.Pixel_Data_Type;
-- Translate raw result from browser to Pixel_Data_Type
----------------------------
-- Get_Drawing_Context_2D --
----------------------------
procedure Get_Drawing_Context_2D (Context : in out Context_2D_Type;
Canvas : in out Canvas_Type'Class)
is
GID : constant String := Gnoga.Server.Connection.New_GID;
begin
Context.Context_ID := Ada.Strings.Unbounded.To_Unbounded_String (GID);
Context.Connection_ID := Canvas.Connection_ID;
Gnoga.Server.Connection.Execute_Script (Context.Connection_ID,
"gnoga['" & GID & "']=" &
Canvas.jQuery &
".get(0).getContext('2d');");
end Get_Drawing_Context_2D;
----------------
-- Fill_Color --
----------------
procedure Fill_Color (Context : in out Context_2D_Type;
Value : in Gnoga.RGBA_Type)
is
begin
Context.Fill_Color (Gnoga.To_String (Value));
end Fill_Color;
procedure Fill_Color (Context : in out Context_2D_Type;
Value : in String)
is
begin
Context.Property ("fillStyle", Value);
end Fill_Color;
procedure Fill_Color
(Context : in out Context_2D_Type;
Value : in Gnoga.Colors.Color_Enumeration)
is
begin
Context.Fill_Color (Gnoga.Colors.To_String (Value));
end Fill_Color;
-------------------
-- Fill_Gradient --
-------------------
procedure Fill_Gradient (Context : in out Context_2D_Type;
Value : in out Gradient_Type'Class)
is
begin
Context.Execute ("fillStyle=gnoga['" &
Ada.Strings.Unbounded.To_String (Value.Context_ID) &
"'];");
end Fill_Gradient;
-------------------
-- Fill_Pattern --
-------------------
procedure Fill_Pattern (Context : in out Context_2D_Type;
Value : in out Pattern_Type'Class)
is
begin
Context.Execute ("fillStyle=gnoga['" &
Ada.Strings.Unbounded.To_String (Value.Context_ID) &
"'];");
end Fill_Pattern;
------------------
-- Stroke_Color --
------------------
procedure Stroke_Color (Context : in out Context_2D_Type;
Value : in Gnoga.RGBA_Type)
is
begin
Context.Stroke_Color (Gnoga.To_String (Value));
end Stroke_Color;
procedure Stroke_Color (Context : in out Context_2D_Type;
Value : in String)
is
begin
Context.Property ("strokeStyle", Value);
end Stroke_Color;
procedure Stroke_Color
(Context : in out Context_2D_Type;
Value : in Gnoga.Colors.Color_Enumeration)
is
begin
Context.Stroke_Color (Gnoga.Colors.To_String (Value));
end Stroke_Color;
---------------------
-- Stroke_Gradient --
---------------------
procedure Stroke_Gradient (Context : in out Context_2D_Type;
Value : in out Gradient_Type'Class)
is
begin
Context.Execute ("strokeStyle=gnoga['" &
Ada.Strings.Unbounded.To_String (Value.Context_ID) &
"'];");
end Stroke_Gradient;
-------------------
-- Stroke_Pattern --
-------------------
procedure Stroke_Pattern (Context : in out Context_2D_Type;
Value : in out Pattern_Type'Class)
is
begin
Context.Execute ("strokeStyle=gnoga['" &
Ada.Strings.Unbounded.To_String (Value.Context_ID) &
"'];");
end Stroke_Pattern;
------------------
-- Shadow_Color --
------------------
procedure Shadow_Color (Context : in out Context_2D_Type;
Value : in Gnoga.RGBA_Type)
is
begin
Context.Shadow_Color (Gnoga.To_String (Value));
end Shadow_Color;
procedure Shadow_Color (Context : in out Context_2D_Type;
Value : in String)
is
begin
Context.Property ("shadowColor", Value);
end Shadow_Color;
procedure Shadow_Color
(Context : in out Context_2D_Type;
Value : in Gnoga.Colors.Color_Enumeration)
is
begin
Context.Shadow_Color (Gnoga.Colors.To_String (Value));
end Shadow_Color;
-----------------
-- Shadow_Blur --
-----------------
procedure Shadow_Blur (Context : in out Context_2D_Type;
Value : in Integer)
is
begin
Context.Property ("shadowBlur", Value);
end Shadow_Blur;
---------------------
-- Shadow_Offset_X --
---------------------
procedure Shadow_Offset_X (Context : in out Context_2D_Type;
Value : in Integer)
is
begin
Context.Property ("shadowOffsetX", Value);
end Shadow_Offset_X;
---------------------
-- Shadow_Offset_Y --
---------------------
procedure Shadow_Offset_Y (Context : in out Context_2D_Type;
Value : in Integer)
is
begin
Context.Property ("shadowOffsetY", Value);
end Shadow_Offset_Y;
--------------
-- Line_Cap --
--------------
procedure Line_Cap (Context : in out Context_2D_Type;
Value : in Line_Cap_Type)
is
begin
Context.Property ("lineCap", Value'Img);
end Line_Cap;
---------------
-- Line_Join --
---------------
procedure Line_Join (Context : in out Context_2D_Type;
Value : in Line_Join_Type)
is
begin
Context.Property ("lineJoin", Value'Img);
end Line_Join;
----------------
-- Line_Width --
----------------
procedure Line_Width (Context : in out Context_2D_Type;
Value : in Integer)
is
begin
Context.Property ("lineWidth", Value);
end Line_Width;
-----------------
-- Miter_Limit --
-----------------
procedure Miter_Limit (Context : in out Context_2D_Type;
Value : in Positive)
is
begin
Context.Property ("miterLimit", Value);
end Miter_Limit;
-------------------
-- Set_Line_Dash --
-------------------
procedure Set_Line_Dash (Context : in out Context_2D_Type;
Dash_List : in Dash_Array_Type)
is
function Dash_String (Index : Natural) return String;
-- Iterate over Dash_List to create JS Array for setLineDash
function Dash_String (Index : Natural) return String is
begin
if Index > Dash_List'Last then
return "";
elsif Index = Dash_List'Last then
return Natural'Image (Dash_List (Index));
else
return Natural'Image
(Dash_List (Index)) & ',' & Dash_String (Index + 1);
end if;
end Dash_String;
begin
Context.Execute
("setLineDash([" & Dash_String (Dash_List'First) & "]);");
end Set_Line_Dash;
----------
-- Font --
----------
procedure Font (Context : in out Context_2D_Type;
Family : in String := "sans-serif";
Height : in String := "10px";
Style : in Font_Style_Type := Normal;
Weight : in Font_Weight_Type := Weight_Normal;
Variant : in Font_Variant_Type := Normal)
is
W : constant String := Weight'Img;
begin
Context.Property ("font", Style'Img & " " & Variant'Img & " " &
W (W'First + 7 .. W'Last) & " " &
Height & " " & Family);
end Font;
procedure Font (Context : in out Context_2D_Type;
System_Font : in System_Font_Type)
is
begin
case System_Font is
when Caption | Icon | Menu =>
Context.Property ("font", System_Font'Img);
when Message_Box =>
Context.Property ("font", "message-box");
when Small_Caption =>
Context.Property ("font", "small-caption");
when Status_Bar =>
Context.Property ("font", "status-bar");
end case;
end Font;
--------------------
-- Text_Alignment --
--------------------
procedure Text_Alignment (Context : in out Context_2D_Type;
Value : in Alignment_Type)
is
V : constant String := Value'Img;
begin
case Value is
when Left | Right | Center =>
Context.Property ("textAlign", V);
when At_Start | To_End =>
Context.Property ("textAlign", V ((V'First + 3) .. V'Last));
end case;
end Text_Alignment;
-------------------
-- Text_Baseline --
-------------------
procedure Text_Baseline (Context : in out Context_2D_Type;
Value : in Baseline_Type)
is
begin
Context.Property ("textBaseline", Value'Img);
end Text_Baseline;
------------------
-- Global_Alpha --
------------------
procedure Global_Alpha (Context : in out Context_2D_Type;
Alpha : in Gnoga.Alpha_Type)
is
begin
Context.Property ("globalAlpha", Alpha'Img);
end Global_Alpha;
--------------------------------
-- Global_Composite_Operation --
--------------------------------
procedure Global_Composite_Operation
(Context : in out Context_2D_Type;
Value : in Composite_Method_Type)
is
V : constant String := Value'Img;
begin
case Value is
when Lighter | Copy =>
Context.Property ("globalCompositeOperation", V);
when Source_Over | Source_Atop | Source_In | Source_Out =>
Context.Property ("globalCompositeOperation",
"source-" & V ((V'First + 7) .. V'Last));
when Destination_Over | Destination_Atop |
Destination_In | Destination_Out =>
Context.Property ("globalCompositeOperation",
"destination-" & V ((V'First + 12) .. V'Last));
when Xor_Copy =>
Context.Property ("globalCompositeOperation", "xor");
end case;
end Global_Composite_Operation;
----------------------------
-- Create_Linear_Gradient --
----------------------------
procedure Create_Linear_Gradient (Gradient : in out Gradient_Type;
Context : in out Context_2D_Type'Class;
X_1 : in Integer;
Y_1 : in Integer;
X_2 : in Integer;
Y_2 : in Integer)
is
GID : constant String := Gnoga.Server.Connection.New_GID;
begin
Gradient.Context_ID := Ada.Strings.Unbounded.To_Unbounded_String (GID);
Gradient.Connection_ID := Context.Connection_ID;
Gnoga.Server.Connection.Execute_Script
(Context.Connection_ID,
"gnoga['" & GID & "']=" &
"gnoga['" &
Ada.Strings.Unbounded.To_String (Context.Context_ID) &
"'].createLinearGradient(" &
X_1'Img & "," &
Y_1'Img & "," &
X_2'Img & "," &
Y_2'Img & ");");
end Create_Linear_Gradient;
----------------------------
-- Create_Radial_Gradient --
----------------------------
procedure Create_Radial_Gradient (Gradient : in out Gradient_Type;
Context : in out Context_2D_Type'Class;
X_1 : in Integer;
Y_1 : in Integer;
R_1 : in Integer;
X_2 : in Integer;
Y_2 : in Integer;
R_2 : in Integer)
is
GID : constant String := Gnoga.Server.Connection.New_GID;
begin
Gradient.Context_ID := Ada.Strings.Unbounded.To_Unbounded_String (GID);
Gradient.Connection_ID := Context.Connection_ID;
Gnoga.Server.Connection.Execute_Script
(Context.Connection_ID,
"gnoga['" & GID & "']=" &
"gnoga['" &
Ada.Strings.Unbounded.To_String (Context.Context_ID) &
"'].createRadialGradient(" &
X_1'Img & "," &
Y_1'Img & "," &
R_1'Img & "," &
X_2'Img & "," &
Y_2'Img & "," &
R_2'Img & ");");
end Create_Radial_Gradient;
--------------------
-- Add_Color_Stop --
--------------------
procedure Add_Color_Stop
(Gradient : in out Gradient_Type;
Position : in Gnoga.Frational_Range_Type;
Color : in Gnoga.RGBA_Type)
is
begin
Gradient.Add_Color_Stop (Position, Gnoga.To_String (Color));
end Add_Color_Stop;
procedure Add_Color_Stop
(Gradient : in out Gradient_Type;
Position : in Gnoga.Frational_Range_Type;
Color : in String)
is
begin
Gradient.Execute ("addColorStop (" & Position'Img &
", '" & Color & "');");
end Add_Color_Stop;
procedure Add_Color_Stop
(Gradient : in out Gradient_Type;
Position : in Gnoga.Frational_Range_Type;
Color : in Gnoga.Colors.Color_Enumeration)
is
begin
Gradient.Add_Color_Stop (Position, Gnoga.Colors.To_String (Color));
end Add_Color_Stop;
----------------------------
-- Create_Radial_Gradient --
----------------------------
procedure Create_Pattern (Pattern : in out Pattern_Type;
Context : in out Context_2D_Type'Class;
Image : in out Element_Type'Class;
Repeat_Pattern : in Repeat_Type := Repeat)
is
GID : constant String := Gnoga.Server.Connection.New_GID;
function Repeat_to_String return String;
function Repeat_to_String return String is
begin
case Repeat_Pattern is
when Repeat =>
return "repeat";
when Repeat_X_Only =>
return "repeat-x";
when Repeat_Y_Only =>
return "repeat-y";
when No_Repeat =>
return "no-repeat";
end case;
end Repeat_to_String;
begin
Pattern.Context_ID := Ada.Strings.Unbounded.To_Unbounded_String (GID);
Pattern.Connection_ID := Context.Connection_ID;
Gnoga.Server.Connection.Execute_Script
(Context.Connection_ID,
"gnoga['" & GID & "']=" &
"gnoga['" &
Ada.Strings.Unbounded.To_String (Context.Context_ID) &
"'].createPattern(" & Image.jQuery & ".get(0), '" &
Repeat_to_String & "');");
end Create_Pattern;
---------------
-- Rectangle --
---------------
procedure Rectangle (Context : in out Context_2D_Type;
Rectangle : in Gnoga.Rectangle_Type)
is
begin
Context.Execute ("rect (" &
Rectangle.X'Img & "," &
Rectangle.Y'Img & "," &
Rectangle.Width'Img & "," &
Rectangle.Height'Img &
");");
end Rectangle;
--------------------
-- Fill_Rectangle --
--------------------
procedure Fill_Rectangle (Context : in out Context_2D_Type;
Rectangle : in Gnoga.Rectangle_Type)
is
begin
Context.Execute ("fillRect (" &
Rectangle.X'Img & "," &
Rectangle.Y'Img & "," &
Rectangle.Width'Img & "," &
Rectangle.Height'Img &
");");
end Fill_Rectangle;
----------------------
-- Stroke_Rectangle --
----------------------
procedure Stroke_Rectangle (Context : in out Context_2D_Type;
Rectangle : in Gnoga.Rectangle_Type)
is
begin
Context.Execute ("strokeRect (" &
Rectangle.X'Img & "," &
Rectangle.Y'Img & "," &
Rectangle.Width'Img & "," &
Rectangle.Height'Img &
");");
end Stroke_Rectangle;
---------------------
-- Clear_Rectangle --
---------------------
procedure Clear_Rectangle (Context : in out Context_2D_Type;
Rectangle : in Gnoga.Rectangle_Type)
is
begin
Context.Execute ("clearRect (" &
Rectangle.X'Img & "," &
Rectangle.Y'Img & "," &
Rectangle.Width'Img & "," &
Rectangle.Height'Img &
");");
end Clear_Rectangle;
----------
-- Fill --
----------
procedure Fill (Context : in out Context_2D_Type) is
begin
Context.Execute ("fill();");
end Fill;
------------
-- Stroke --
------------
procedure Stroke (Context : in out Context_2D_Type) is
begin
Context.Execute ("stroke();");
end Stroke;
----------------
-- Begin_Path --
----------------
procedure Begin_Path (Context : in out Context_2D_Type) is
begin
Context.Execute ("beginPath();");
end Begin_Path;
--------------
-- Move_To --
--------------
procedure Move_To (Context : in out Context_2D_Type; X, Y : Integer) is
begin
Context.Execute ("moveTo(" & X'Img & "," & Y'Img & ");");
end Move_To;
----------------
-- Close_Path --
----------------
procedure Close_Path (Context : in out Context_2D_Type) is
begin
Context.Execute ("closePath()");
end Close_Path;
--------------
-- Line_To --
--------------
procedure Line_To (Context : in out Context_2D_Type; X, Y : Integer) is
begin
Context.Execute ("lineTo(" & X'Img & "," & Y'Img & ");");
end Line_To;
----------
-- Clip --
----------
procedure Clip (Context : in out Context_2D_Type) is
begin
Context.Execute ("clip();");
end Clip;
------------------------
-- Quadratic_Curve_To --
------------------------
procedure Quadratic_Curve_To (Context : in out Context_2D_Type;
CP_X, CP_Y, X, Y : Integer)
is
begin
Context.Execute ("quadraticCurveTo(" &
CP_X'Img & "," &
CP_Y'Img & "," &
X'Img & "," &
Y'Img & ");");
end Quadratic_Curve_To;
---------------------
-- Bezier_Curve_To --
---------------------
procedure Bezier_Curve_To
(Context : in out Context_2D_Type;
CP_X_1, CP_Y_1, CP_X_2, CP_Y_2 : in Integer;
X, Y : in Integer)
is
begin
Context.Execute ("bezierCurveTo(" &
CP_X_1'Img & "," & CP_Y_1'Img & "," &
CP_X_2'Img & "," & CP_Y_2'Img & "," &
X'Img & "," &
Y'Img & ");");
end Bezier_Curve_To;
-----------------
-- Arc_Radians --
-----------------
procedure Arc_Radians
(Context : in out Context_2D_Type;
X, Y : in Integer;
Radius : in Integer;
Starting_Angle, Ending_Angle : in Float;
Counter_Clockwise : in Boolean := False)
is
begin
Context.Execute ("arc(" &
X'Img & "," & Y'Img & "," &
Radius'Img & "," &
Starting_Angle'Img & "," & Ending_Angle'Img & "," &
Counter_Clockwise'Img & ");");
end Arc_Radians;
-----------------
-- Arc_Degrees --
-----------------
procedure Arc_Degrees
(Context : in out Context_2D_Type;
X, Y : in Integer;
Radius : in Integer;
Starting_Angle, Ending_Angle : in Float;
Counter_Clockwise : in Boolean := False)
is
begin
Arc_Radians (Context, X, Y, Radius,
Starting_Angle * Ada.Numerics.Pi / 180.0,
Ending_Angle * Ada.Numerics.Pi / 180.0,
Counter_Clockwise);
end Arc_Degrees;
------------
-- Arc_To --
------------
procedure Arc_To
(Context : in out Context_2D_Type;
X_1, Y_1, X_2, Y_2 : in Integer;
Radius : in Integer)
is
begin
Context.Execute ("arcTo(" &
X_1'Img & "," & Y_1'Img & "," &
X_2'Img & "," & Y_2'Img & "," &
Radius'Img & ");");
end Arc_To;
----------------
-- Polygon_To --
----------------
procedure Polygon_To
(Context : in out Context_2D_Type;
Points : in Gnoga.Point_Array_Type)
is
Script : Ada.Strings.Unbounded.Unbounded_String;
begin
for Point of Points loop
Ada.Strings.Unbounded.Append (Script, "gnoga['" &
Context.ID & "'].lineTo(" &
Point.X'Img & "," & Point.Y'Img & ");");
end loop;
Gnoga.Server.Connection.Execute_Script
(Context.Connection_ID, Ada.Strings.Unbounded.To_String (Script));
end Polygon_To;
----------------------
-- Is_Point_In_Path --
----------------------
function Is_Point_In_Path (Context : Context_2D_Type; X, Y : Integer)
return Boolean
is
begin
return Context.Execute
("isPointInPath(" & X'Img & "," & Y'Img & ");") = "true";
end Is_Point_In_Path;
-----------
-- Scale --
-----------
procedure Scale (Context : in out Context_2D_Type; Width, Height : Float)
is
begin
Context.Execute ("scale (" & Width'Img & "," & Height'Img & ");");
end Scale;
--------------------
-- Rotate_Radians --
--------------------
procedure Rotate_Radians (Context : in out Context_2D_Type; Radians : Float)
is
begin
Context.Execute ("rotate(" & Radians'Img & ");");
end Rotate_Radians;
--------------------
-- Rotate_Degrees --
--------------------
procedure Rotate_Degrees (Context : in out Context_2D_Type; Degrees : Float)
is
begin
Rotate_Radians (Context, Degrees * Ada.Numerics.Pi / 180.0);
end Rotate_Degrees;
---------------
-- Translate --
---------------
procedure Translate (Context : in out Context_2D_Type; X, Y : Integer) is
begin
Context.Execute ("translate(" & X'Img & "," & Y'Img & ");");
end Translate;
---------------
-- Transform --
---------------
procedure Transform
(Context : in out Context_2D_Type;
Scale_Horizontal, Skew_Horizontal : in Float;
Scale_Vertical, Skew_Vertical : in Float;
Move_Horizontal, Move_Vertical : in Float)
is
begin
Context.Execute
("transform(" &
Scale_Horizontal'Img & "," & Skew_Horizontal'Img & "," &
Scale_Vertical'Img & "," & Skew_Vertical'Img & "," &
Move_Horizontal'Img & "," & Move_Vertical'Img & ");");
end Transform;
-------------------
-- Set_Transform --
-------------------
procedure Set_Transform
(Context : in out Context_2D_Type;
Scale_Horizontal, Skew_Horizontal : in Float;
Scale_Vertical, Skew_Vertical : in Float;
Move_Horizontal, Move_Vertical : in Float)
is
begin
Context.Execute
("setTransform(" &
Scale_Horizontal'Img & "," & Skew_Horizontal'Img & "," &
Scale_Vertical'Img & "," & Skew_Vertical'Img & "," &
Move_Horizontal'Img & "," & Move_Vertical'Img & ");");
end Set_Transform;
procedure Fill_Text (Context : in out Context_2D_Type;
Text : in String;
X, Y : in Integer;
Max_Length : in Natural := 0)
is
function Max_To_String return String;
function Max_To_String return String is
begin
if Max_Length > 0 then
return "," & Max_Length'Img;
else
return "";
end if;
end Max_To_String;
begin
Context.Execute ("fillText('" & Escape_Quotes (Text) & "'," &
X'Img & "," & Y'Img & Max_To_String & ");");
end Fill_Text;
procedure Stroke_Text (Context : in out Context_2D_Type;
Text : in String;
X, Y : in Integer;
Max_Length : in Natural := 0)
is
function Max_To_String return String;
function Max_To_String return String is
begin
if Max_Length > 0 then
return "," & Max_Length'Img;
else
return "";
end if;
end Max_To_String;
begin
Context.Execute ("strokeText('" & Escape_Quotes (Text) & "'," &
X'Img & "," & Y'Img & Max_To_String & ");");
end Stroke_Text;
function Measure_Text_Width (Context : Context_2D_Type;
Text : String)
return Float
is
begin
return Float'Value (Gnoga.Server.Connection.Execute_Script
(ID => Context.Connection_ID,
Script => "gnoga['" &
Ada.Strings.Unbounded.To_String (Context.Context_ID) &
"'].measureText ('" & Escape_Quotes (Text) & "').width"));
end Measure_Text_Width;
----------------
-- Draw_Image --
----------------
procedure Draw_Image (Context : in out Context_2D_Type'Class;
Image : in out Element_Type'Class;
X, Y : in Integer)
is
begin
Context.Execute ("drawImage (" & Image.jQuery & ".get(0)," &
X'Img & "," & Y'Img & ")");
end Draw_Image;
procedure Draw_Image (Context : in out Context_2D_Type'Class;
Image : in out Element_Type'Class;
X, Y : in Integer;
Width : in Natural;
Height : in Natural)
is
begin
Context.Execute ("drawImage (" & Image.jQuery & ".get(0)," &
X'Img & "," & Y'Img & ","
& Width'Img & "," & Height'Img & ")");
end Draw_Image;
-----------------------
-- Create_Image_Data --
-----------------------
procedure Create_Image_Data (Context : in out Context_2D_Type;
Image_Data : in out Image_Data_Type'Class;
Width, Height : in Integer)
is
GID : constant String := Gnoga.Server.Connection.New_GID;
begin
Image_Data.Context_ID := Ada.Strings.Unbounded.To_Unbounded_String (GID);
Image_Data.Connection_ID := Context.Connection_ID;
Gnoga.Server.Connection.Execute_Script
(Context.Connection_ID, "gnoga['" & GID & "']=gnoga['" &
Context.ID & "'].createImageData(" &
Width'Img & "," & Height'Img & ")");
end Create_Image_Data;
--------------------------
-- String_To_Pixel_Data --
--------------------------
function String_To_Pixel_Data (Value : String; Width, Height : Positive)
return Gnoga.Pixel_Data_Type
is
use Ada.Strings.Fixed;
D : Gnoga.Pixel_Data_Type (1 .. Width, 1 .. Height);
S : Integer;
F : Integer := Value'First - 1;
Red : Color_Type;
Green : Color_Type;
Blue : Color_Type;
Alpha : Color_Type;
function Split return Color_Type;
-- Split string and extract values
function Split return Color_Type is
begin
S := F + 1;
F := Index (Source => Value,
Pattern => ",",
From => S);
if F = 0 then
F := Value'Last;
return Color_Type'Value (Value (S .. F));
end if;
return Color_Type'Value (Value (S .. F - 1));
end Split;
begin
for Y in 1 .. Height loop
for X in 1 .. Width loop
Red := Split;
Green := Split;
Blue := Split;
Alpha := Split;
D (X, Y) := (Red, Green, Blue, Alpha);
end loop;
end loop;
return D;
end String_To_Pixel_Data;
-----------
-- Pixel --
-----------