Abelian sandpile model: Difference between revisions
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target_link_libraries(abelian_sandpile xtensor ${OIIO})
</pre>
=={{header|Delphi}}==
{{Trans|Python}}
<lang Delphi>
program Abelian_sandpile_model;
{$APPTYPE CONSOLE}
{$R *.res}
uses
System.SysUtils,
Vcl.Graphics,
System.Classes;
type
TGrid = array of array of Integer;
function Iterate(var Grid: TGrid): Boolean;
var
changed: Boolean;
i: Integer;
j: Integer;
val: Integer;
Alength: Integer;
begin
Alength := length(Grid);
changed := False;
for i := 0 to High(Grid) do
for j := 0 to High(Grid[0]) do
begin
val := Grid[i, j];
if val > 3 then
begin
Grid[i, j] := Grid[i, j] - 4;
if i > 0 then
Grid[i - 1, j] := Grid[i - 1, j] + 1;
if i < Alength - 1 then
Grid[i + 1, j] := Grid[i + 1, j] + 1;
if j > 0 then
Grid[i, j - 1] := Grid[i, j - 1] + 1;
if j < Alength - 1 then
Grid[i, j + 1] := Grid[i, j + 1] + 1;
changed := True;
end;
end;
Result := changed;
end;
procedure Simulate(var Grid: TGrid);
var
changed: Boolean;
begin
while Iterate(Grid) do
;
end;
procedure Zeros(var Grid: TGrid; Size: Integer);
var
i, j: Integer;
begin
SetLength(Grid, Size, Size);
for i := 0 to Size - 1 do
for j := 0 to Size - 1 do
Grid[i, j] := 0;
end;
procedure Println(Grid: TGrid);
var
i, j: Integer;
begin
for i := 0 to High(Grid) do
begin
Writeln;
for j := 0 to High(Grid[0]) do
Write(Format('%3d', [Grid[i, j]]));
end;
Writeln;
end;
function Grid2Bmp(Grid: TGrid): TBitmap;
const
Colors: array[0..2] of TColor = (clRed, clLime, clBlue);
var
Alength: Integer;
i: Integer;
j: Integer;
begin
Alength := Length(Grid);
Result := TBitmap.Create;
Result.SetSize(Alength, Alength);
for i := 0 to Alength - 1 do
for j := 0 to Alength - 1 do
begin
Result.Canvas.Pixels[i, j] := Colors[Grid[i, j]];
end;
end;
procedure Grid2P6(Grid: TGrid; FileName: TFileName);
var
f: text;
i, j, Alength: Integer;
ppm: TFileStream;
Header: AnsiString;
const
COLORS: array[0..3] of array[0..2] of byte =
// R, G, B
((0 , 0, 0),
(255 , 0, 0),
(0 , 255, 0),
(0 , 0, 255));
begin
Alength := Length(Grid);
ppm := TFileStream.Create(FileName, fmCreate);
Header := Format('P6'#10'%d %d'#10'255'#10, [Alength, Alength]);
writeln(Header);
ppm.Write(Tbytes(Header), Length(Header));
for i := 0 to Alength - 1 do
for j := 0 to Alength - 1 do
begin
ppm.Write(COLORS[Grid[i, j]], 3);
end;
ppm.Free;
end;
const
DIMENSION = 10;
var
Grid: TGrid;
bmp: TBitmap;
begin
Zeros(Grid, DIMENSION);
Grid[4, 4] := 64;
Writeln('Before:');
Println(Grid);
Simulate(Grid);
Writeln(#10'After:');
Println(Grid);
// Output bmp
with Grid2Bmp(Grid) do
begin
SaveToFile('output.bmp');
free;
end;
// Output ppm
Grid2P6(Grid, 'output.ppm');
Readln;
end.
</lang>
=={{header|Forth}}==
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