Wooohooo!!! A cartesian graph on Android! 
Yes, my favorite "hello world" for graphics applications...
Just for curiosity .... some code:
Android:
procedure TAndroidModule1.ViewPort1ChangeFontColor(Sender: TObject);
begin
FPNoGUIGraphicsBridge1.SetFontColor(ViewPort1.FontColor);
end;
function GenericFunction1(x: real): real;
begin
Result:= x*x*x;
end;
function GenericFunction2(x: real): real;
begin
Result:= 4*x*x*x*x - 5*x*x*x - x*x + x -1;
end;
procedure TAndroidModule1.jButton1Click(Sender: TObject);
var
jGraphicsBuffer: jObject;
w, h: integer;
begin
w:= jPanel2.Width;
h:= jPanel2.Height;
ViewPort1.Width:= w;
ViewPort1.Height:= h;
ViewPort1.DrawAxis:= True;
ViewPort1.DrawGrid:= True;
//ViewPort1.FontColor:= colbrGreen;
ViewPort1.SetScaleXY(-1.6 {xmin},1.6{xmax}, -2.0{ymin}, 6.0{ymax}); //real world!!!
FPNoGUIGraphicsBridge1.SetSize(w,h);
//DroidSerif-Bold.ttf
FPNoGUIGraphicsBridge1.PathToFontFile:= '/system/fonts/Roboto-Regular.ttf';
FPNoGUIGraphicsBridge1.AddEntity('blue_layer','Circle',[Point(0.0,1.0){left/top},
Point(1.0,0.0){right/botom}],'This is a Circle!','foo');
FPNoGUIGraphicsBridge1.AddEntity('blue_layer','Line',[Point(0.0,1.5),Point(1.0, 3.6)],'','foo');
FPNoGUIGraphicsBridge1.AddEntity('blue_layer','Polyline',[Point(0.0,1.5),Point(0.5,1),
Point(1.0,1.5), Point(0.5,2)],'','');
FPNoGUIGraphicsBridge1.AddEntity('blue_layer','Text',[Point(0.0,0.5)],'Hello World!','');
FPNoGUIGraphicsBridge1.AddFunction(@GenericFunction1,-1.6,1.6);
FPNoGUIGraphicsBridge1.AddFunction(@GenericFunction2,-1.6,1.6);
FPNoGUIGraphicsBridge1.PaintViewPort;
FPNoGUIGraphicsBridge1.PaintGrid(True);
ViewPort1.PenColor:= colbrBlue;
FPNoGUIGraphicsBridge1.DrawEntities('blue_layer');
//ViewPort1.PenColor:= colbrGreen;
//FPNoGUIGraphicsBridge1.DrawEntities('green_layer'); //from "datagraph.txt"
ViewPort1.PenColor:= colbrRed;
FPNoGUIGraphicsBridge1.DrawFunction(False, 0);
FPNoGUIGraphicsBridge1.DrawFunction(False, 1);
jGraphicsBuffer:= jBitmap1.GetByteBuffer(w,h);
PGlobalDirectImagePixel:= jBitmap1.GetDirectBufferAddress(jGraphicsBuffer);
FPNoGUIGraphicsBridge1.Surface.GetRGBAGraphics(PGlobalDirectImagePixel);
jImageView1.SetImageBitmap(jBitmap1.GetBitmapFromByteBuffer(jGraphicsBuffer, w, h));
end;
Windows:
procedure TForm1.FPDxfWriteBridge1ProduceEntity(out entityDXF: string);
var
i: integer;
strList: TStringList;
begin
strList:= TStringList.Create;
entityDXF:='';
for i:= 0 to FPNoGUIGraphicsBridge1.EntityList.Count - 1 do
begin
if FPNoGUIGraphicsBridge1.DXFWriteBridge.RestrictedLayer <> '' then
begin
if Pos(FPNoGUIGraphicsBridge1.DXFWriteBridge.RestrictedLayer,
FPNoGUIGraphicsBridge1.GetEntity(i).EntityData.Layer) > 0 then
begin
strList.Add(FPNoGUIGraphicsBridge1.GetEntity(i).DataToDXF);
end;
end
else
begin
strList.Add(FPNoGUIGraphicsBridge1.GetEntity(i).DataToDXF);
end;
end;
entityDXF:= Trim(strList.Text);
strList.Free;
end;
function GenericFunction1(x: real): real;
begin
Result:= x*x*x;
end;
function GenericFunction2(x: real): real;
begin
Result:= 4*x*x*x*x - 5*x*x*x - x*x + x -1;
end;
procedure TForm1.FormActivate(Sender: TObject);
begin
ViewPort1.Height:= PaintBox1.Height;
ViewPort1.Width:= PaintBox1.Width;
ViewPort1.DrawAxis:= True;
ViewPort1.DrawGrid:= True;
ViewPort1.SetScaleXY(-1.6 {xmin}, 1.6 {xmax}, -2.0 {ymin}, 6.0 {ymax});
FPNoGUIGraphicsBridge1.AddFunction(@GenericFunction1,-1.6,1.6);
FPNoGUIGraphicsBridge1.AddFunction(@GenericFunction2,-1.6,1.6);
FPNoGUIGraphicsBridge1.SetSize(ViewPort1.Width, ViewPort1.Height);
FPNoGUIGraphicsBridge1.PathToFontFile:= 'C:\Windows\Fonts\Arial.ttf';
//hint [android] FPNoGUIGraphicsBridge1.PathToFontFile:= '/system/fonts/Roboto-Regular.ttf';
//hint [linux] FPNoGUIGraphicsBridge1.PathToFontFile:= '/usr/share/fonts/TTF/Arial.ttf';
FPNoGUIGraphicsBridge1.AddEntity('blue_layer','Circle',[Point(0,1.0){left/top},
Point(1.0,0){right/botom}],'This is a Circle!','foo');
FPNoGUIGraphicsBridge1.AddEntity('blue_layer','Line',[Point(0.0,1.5),Point(1.0, 3.6)],'','foo');
FPNoGUIGraphicsBridge1.AddEntity('blue_layer','Polyline',[Point(0,1.5),Point(0.5,1),
Point(1,1.5), Point(0.5,2)],'','');
FPNoGUIGraphicsBridge1.AddEntity('blue_layer','Text',[Point(0,0.5)],'Hello World!','');
(* "datagraph.txt" data format:
id#circle;layer#green_layer;title#;x#0.50 1.50;y#1.00 0.00
id#line;layer#green_layer;title#;x#0.30 1.00;y#3.60 2.00
id#polygon;layer#green_layer;title#;x#0.50 1.00 1.50 1.00;y#1.50 1.00 1.50 2.00
id#text;layer#green_layer;title#This is Pascal!;x#1.00;y#1.00
id#point;layer#green_layer;title#;x#-0.30;y#2.00
*)
FPNoGUIGraphicsBridge1.LoadEntitiesFromFile('datagraph.txt'); //layer_green
FPNoGUIGraphicsBridge1.PaintViewPort;
FPNoGUIGraphicsBridge1.PaintGrid(True);
ViewPort1.PenColor:= colbrBlue;
FPNoGUIGraphicsBridge1.DrawEntities('blue_layer');
ViewPort1.PenColor:= colbrGreen;
FPNoGUIGraphicsBridge1.DrawEntities('green_layer'); //from "datagraph.txt"
ViewPort1.PenColor:= colbrRed;
FPNoGUIGraphicsBridge1.DrawFunction(False {not clear screen}, 0 {index});
FPNoGUIGraphicsBridge1.DrawFunction(False {not clear screen}, 1 {index});
//Prepare DXF {1-red} {3-green} {5-blue}
FPNoGUIGraphicsBridge1.DXFWriteBridge.AddLayer('blue_layer', 'CONTINUOUS', 5 );
FPNoGUIGraphicsBridge1.DXFWriteBridge.AddLayer('green_layer', 'CONTINUOUS', 3 );
FPNoGUIGraphicsBridge1.DXFWriteBridge.ProduceEntity('blue_layer'); //restricted layer... event OnProduceEntity
FPNoGUIGraphicsBridge1.DXFWriteBridge.SaveToFile('blue_layer.dxf');
FPNoGUIGraphicsBridge1.DXFWriteBridge.ProduceEntity('green_layer'); //restricted layer... event OnProduceEntity
FPNoGUIGraphicsBridge1.DXFWriteBridge.SaveToFile('green_layer.dxf');
FPNoGUIGraphicsBridge1.DXFWriteBridge.ProduceEntity(''); //not restricted layer... event OnProduceEntity
FPNoGUIGraphicsBridge1.DXFWriteBridge.SaveToFile('all_layer.dxf');
end;
procedure TForm1.PaintBox1Paint(Sender: TObject);
begin
FPNoGUIGraphicsBridge1.Surface.CopyToCanvas(0,0,PaintBox1.Canvas);
end;
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