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glplotter.lpr
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{
Copyright 2001-2024 Michalis Kamburelis.
This file is part of "glplotter".
"glplotter" is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
"glplotter" 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. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with "glplotter"; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
----------------------------------------------------------------------------
}
program glplotter;
{ TODO:
- allow to specify own color in graph file as color= lines
}
{$ifdef MSWINDOWS} {$apptype GUI} {$endif}
uses SysUtils, Generics.Collections, Math,
CastleWindow, CastleUtils, CastleGLUtils, Classes, CastleRenderOptions,
CastleClassUtils, CastleMessages, CastleParameters, CastleVectors,
CastleStringUtils, CastleFilesUtils, CastleScript, CastleScriptParser,
CastleWindowRecentFiles, CastleGLImages, CastleColors, CastleUIControls,
CastleConfig, CastleKeysMouse, CastleURIUtils, CastleControls,
CastleDownload, CastleRenderContext, CastleApplicationProperties;
const
Version = '2.1.0';
{ colors -------------------------------------------------------------------- }
type
{ pomiedzy ciGraph1 a ciGraphMax musza byc kolejne ciGraph* }
TColorItem = (ciBG, ciMainXYLines, ciCrosshair,
ciGrid1, ciNumScale1, ciNumbers1,
ciGridPi, ciNumScalePi, ciNumbersPi,
ciGridCustom, ciNumScaleCustom, ciNumbersCustom,
ciGraph1, ciGraph2, ciGraph3);
TColorScheme = array [TColorItem] of TCastleColor;
PColorScheme = ^TColorScheme;
const
ciGraphMax = ciGraph3;
GraphColorsInScheme = Ord(ciGraphMax) - Ord(ciGraph1) + 1;
{ zestawy kolorow : }
ColorSchemeDark: TColorScheme =
( (X: 0.0 ; Y: 0.0 ; Z: 0.0 ; W: 1.0),
(X: 0.33; Y: 0.33; Z: 1.0 ; W: 1.0),
(X: 1.0 ; Y: 1.0 ; Z: 1.0 ; W: 1.0),
(X: 0.0 ; Y: 0.11; Z: 0.0 ; W: 1.0),
(X: 0.0 ; Y: 0.33; Z: 0.0 ; W: 1.0),
(X: 0.0 ; Y: 0.66; Z: 0.0 ; W: 1.0),
(X: 0.66; Y: 0.16; Z: 0.0 ; W: 1.0),
(X: 0.66; Y: 0.16; Z: 0.0 ; W: 1.0),
(X: 0.66; Y: 0.33; Z: 0.0 ; W: 1.0),
(X: 0 ; Y: 0.0 ; Z: 0.66; W: 1.0),
(X: 0 ; Y: 0.0 ; Z: 0.66; W: 1.0),
(X: 0.33; Y: 0.33; Z: 1.0 ; W: 1.0),
(X: 1.0 ; Y: 1.0 ; Z: 0.33; W: 1.0),
(X: 1.0 ; Y: 0.0 ; Z: 0.0 ; W: 1.0),
(X: 0.66; Y: 0.66; Z: 0.66; W: 1.0)
);
ColorSchemeLight: TColorScheme =
( (X: 1.0 ; Y: 1.0 ; Z: 1.0 ; W: 1.0),
(X: 0.0 ; Y: 0.0 ; Z: 0.66; W: 1.0),
(X: 0.0 ; Y: 0.66; Z: 0.0 ; W: 1.0),
(X: 1.0 ; Y: 1.0 ; Z: 0.33; W: 1.0),
(X: 1.0 ; Y: 1.0 ; Z: 0.33; W: 1.0),
(X: 0.0 ; Y: 0.66; Z: 0.0 ; W: 1.0),
(X: 1.0 ; Y: 0.5 ; Z: 0.0 ; W: 1.0),
(X: 1.0 ; Y: 0.5 ; Z: 0.0 ; W: 1.0),
(X: 0.66; Y: 0.33; Z: 0.0 ; W: 1.0),
(X: 1.0 ; Y: 0.5 ; Z: 0.0 ; W: 1.0),
(X: 1.0 ; Y: 0.5 ; Z: 0.0 ; W: 1.0),
(X: 1.0 ; Y: 0.5 ; Z: 0.0 ; W: 1.0),
(X: 0.0 ; Y: 0.0 ; Z: 0.0 ; W: 1.0),
(X: 0.0 ; Y: 0.66; Z: 0.0 ; W: 1.0),
(X: 0.66; Y: 0.66; Z: 0.66; W: 1.0)
);
var
ColorScheme: PColorScheme = @ColorSchemeDark;
{ TGraph --------------------------------------------------------------------- }
type
TXY = record
Break: boolean; { jezeli Break to pola x, y sa bez znaczenia }
x, y: Float; { these must be float to work with DeFormat %f }
end;
PXY = ^TXY;
TXYList = specialize TStructList<TXY>;
type
TGraph = class
private
FVisible: boolean;
procedure SetVisible(const Value: boolean);
procedure CreateCommon(const AColorNumber: Integer);
public
MenuItem: TMenuItemChecked;
Points: TXYList;
ColorNumber: Integer;
Color: TCastleColor;
Name: string;
property Visible: boolean read FVisible write SetVisible;
{ Update Color from ColorNumber and ColorScheme. }
procedure UpdateColor;
{ Initialize TGraph reading Points from file URL.
URL = '-' means stdin.
Graph name will be taken from URL, or (if line "name=..." is
present in PointsFile) then it will be used.
@param AColorNumber color number, counted from 0. }
constructor CreateFromFile(const URL: string;
const AColorNumber: Integer);
{ Initialize TGraph using function Expression. }
constructor CreateFromExpression(const Expression: string;
const X1Str, X2Str, XStepStr: string;
const AColorNumber: Integer); overload;
constructor CreateFromExpression(const Expression: string;
const X1, X2, XStep: Extended;
const AColorNumber: Integer); overload;
destructor Destroy; override;
end;
procedure TGraph.UpdateColor;
begin
{ calculate Color }
if ColorNumber < GraphColorsInScheme then
Color := ColorScheme^[TColorItem(Ord(ciGraph1) + ColorNumber)] else
repeat
Color := Vector4(Random, Random, Random, 1.0);
{ Don't allow too dark colors, as they are not visible... }
until GrayscaleValue(Color) >= 0.2;
end;
procedure TGraph.CreateCommon(const AColorNumber: Integer);
begin
ColorNumber := AColorNumber;
UpdateColor;
{ initialize Points }
Points := TXYList.Create;
FVisible := true;
end;
constructor TGraph.CreateFromExpression(const Expression: string;
const X1Str, X2Str, XStepStr: string;
const AColorNumber: Integer);
begin
CreateFromExpression(Expression,
ParseConstantFloatExpression(X1Str),
ParseConstantFloatExpression(X2Str),
ParseConstantFloatExpression(XStepStr),
AColorNumber);
end;
constructor TGraph.CreateFromExpression(const Expression: string;
const X1, X2, XStep: Extended;
const AColorNumber: Integer);
var
I: Integer;
Expr: TCasScriptExpression;
X, Y: TCasScriptFloat;
begin
inherited Create;
CreateCommon(AColorNumber);
Name := Expression;
X := TCasScriptFloat.Create(false);
try
X.Name := 'x';
Expr := ParseFloatExpression(Expression, [X]);
try
Points.Count := Floor((X2 - X1) / XStep);
for I := 0 to Points.Count - 1 do
begin
{ calculate each time X as X1 + I * XStep, this is numerically stable
(contrary to X += XStep each time. that cummulates errors) }
X.Value := X1 + I * XStep;
Y := Expr.TryExecuteMath as TCasScriptFloat;
Points.L[I].X := X.Value;
Points.L[I].Break := Y = nil;
if Y <> nil then
Points.L[I].Y := Y.Value;
end;
finally FreeAndNil(Expr) end;
finally FreeAndNil(X) end;
end;
constructor TGraph.CreateFromFile(const URL: string; const AColorNumber: Integer);
procedure CreateFromReader(PointsFile: TTextReader; const AName: string);
var line: string;
xy: TXY;
const
SNameLine = 'name=';
SBreakLine = 'break';
begin
Name := AName;
{ load Points from PointsFile }
while not PointsFile.Eof do
begin
line := PointsFile.Readln;
line := Trim(line);
if (line = '') or (line[1] = '#') then
{to jest komentarz; wiec nic nie rob} else
if IsPrefix(SNameLine, line) then
begin
Name := SEnding(line, Length(SNameLine)+1); {to jest name=}
end else
begin
xy.Break := SameText(line, SBreakLine);
{ stworz nowy punkt, chyba ze to jest linia z breakiem i (poprzednia linia
tez byla z breakiem lub nie bylo poprzednej linii) }
if not (xy.Break and ((Points.Count = 0) or Points.Last.Break) ) then
begin
if not xy.Break then DeFormat(line, '%f %f', [@xy.x, @xy.y]);
Points.Add(xy);
end;
end;
end;
end;
var
Reader: TTextReader;
begin
inherited Create;
CreateCommon(AColorNumber);
if URL = '-' then
begin
Reader := TTextReader.Create(StdInStream, false);
try
CreateFromReader(Reader, 'stdin');
finally FreeAndNil(Reader) end;
end else
begin
Reader := TTextReader.Create(URL);
try
CreateFromReader(Reader, URL);
finally FreeAndNil(Reader) end;
end;
end;
destructor TGraph.Destroy;
begin
FreeAndNil(Points);
inherited;
end;
procedure TGraph.SetVisible(const Value: boolean);
begin
FVisible := Value;
if MenuItem <> nil then MenuItem.Checked := Value;
end;
type
TGraphList = specialize TObjectList<TGraph>;
var
Graphs: TGraphList;
{ BoolOptions -------------------------------------------------------- }
type
TBoolOption=
( boCrosshair, boPointsCoords, boMainXYLines, boMap,
boGrid1, boNumScale1, boNumbers1,
boGridPi, boNumScalePi, boNumbersPi,
boGridCustom, boNumScaleCustom, boNumbersCustom,
boOnlyPoints);
var
{ Current boolean options state. }
BoolOptions: array[TBoolOption]of boolean =
( false, false, true, true,
true, true, true,
false, false, false,
false, false, false,
false);
const
{ BoolOptionsKeys decyduja o przelaczaniu opcji klawiszami }
BoolOptionsKeys: array[TBoolOption]of char =
( 'c', 'p', 'l', 'm',
'g', 's', 'n',
'G', 'S', 'N',
CtrlG, CtrlS, CtrlN,
'o' );
BoolOptionsMenuNames: array[TBoolOption]of string =
( 'Crosshair', 'Point Coordinates', 'Main XY lines', 'Map',
'Grid 1', 'NumScale 1', 'Numbers 1',
'Grid Pi', 'NumScale Pi', 'Numbers Pi',
'Grid Custom', 'NumScale Custom', 'Numbers Custom',
'Only Points');
{ inne zmienne globalne -------------------------------------------------- }
var
Window: TCastleWindow;
CustomSize: Single = 2.5;
{ ponizej rzeczy ktore sa bezposrednio wykorzystywane w Render.
Ich wartosci poczatkowe sa ustalane w HomeState. }
MoveX, MoveY: Single;
ScaleX, ScaleY: Single;
{ global funcs ---------------------------------------------------------- }
{ Reset view properties to default, such that all Graphs are visible. }
procedure HomeState;
var
MinX, MaxX, MinY, MaxY: Float;
MiddleX, MiddleY, SizeX, SizeY: Float;
i, j: Integer;
begin
MinX := MaxFloat;
MinY := MaxFloat;
MaxX := -MaxFloat;
MaxY := -MaxFloat;
for i := 0 to Graphs.Count-1 do
for j := 0 to Graphs[i].Points.Count-1 do
begin
MinX := Min(MinX, Graphs[i].Points.L[j].x);
MinY := Min(MinY, Graphs[i].Points.L[j].y);
MaxX := Max(MaxX, Graphs[i].Points.L[j].x);
MaxY := Max(MaxY, Graphs[i].Points.L[j].y);
end;
if MinX = MaxFloat then
begin
{ This means that there was no points (with Break = false)
in graphs (maybe there was no graphs at all) !
So we set default MoveXY (look at the middle) and ScaleXY. }
MoveX := Window.Width/2;
MoveY := Window.Height/2;
ScaleX := 100;
ScaleY := 100;
end else
begin
SizeX := MaxX - MinX;
SizeY := MaxY - MinY;
{ When ScaleX/Y = 1, we see Window.Width/Height pixels.
But we want to see SizeX/Y pixels.
Also we don't want ScaleX/Y to be too little (this makes a lot of trouble,
and OpenGL rendering also has trouble and crawls surprisingly slowly).
By default we set ScaleX and ScaleY to be equal, as this is most
natural for user. }
ScaleX := Max(Min(Window.Width / SizeX, Window.Height / SizeY), 0.01);
ScaleY := ScaleX;
MiddleX := (MinX + MaxX) / 2;
MiddleY := (MinY + MaxY) / 2;
{ MoveX/Y to look at MiddleX/Y.
I want XWindowToUklad(Window.Width/2) = MiddleX.
Solve equation (Window.Width/2-MoveX)/ScaleX = MiddleX for MoveX and you got
what you need. }
MoveX := Window.Width /2 - MiddleX * ScaleX;
MoveY := Window.Height/2 - MiddleY * ScaleY;
end;
Window.Invalidate;
end;
{ funkcje XYWindowToUklad pobieraja pozycje we wspolrzednej okna OpenGL'a
(czyli 0..Window.Width lub Window.Height)
i zwracaja jaka jest pozycja punktu na wykresie
w tym miejscu okna.
They invent Transform2. }
function XWindowToUklad(WindowX: Single): Single;
begin result := (WindowX - MoveX) / ScaleX end;
function YWindowToUklad(WindowY: Single): Single;
begin result := (WindowY - MoveY) / ScaleY end;
var
GraphsListMenu: TMenu;
procedure UpdateGraphsMenu;
var
I: Integer;
CharKey: char;
const
GraphsListPrefixNumber = 5;
begin
while GraphsListMenu.Count > GraphsListPrefixNumber do
GraphsListMenu.Delete(GraphsListPrefixNumber);
for I := 0 to Graphs.Count-1 do
begin
if I < 10 then
CharKey := DigitAsChar(i) else
CharKey := #0;
Graphs[i].MenuItem := TMenuItemChecked.Create(
'Graph "' + SQuoteMenuEntryCaption(Graphs[i].Name) + '"',
I + 1000, CharKey, Graphs[i].Visible,
false {false, because TGraph.SetVisible will handle this anyway});
GraphsListMenu.Append(Graphs[i].MenuItem);
end;
end;
{ This creates new TGraph instance using CreateFromFile
and adds it to Graphs list.
If loading graph from file fails, it will display nice MessageOK dialog.
It also takes care of setting AColorNumber parameter for TGraph.Create
as it should be. }
procedure GraphsAddFromFile(const URL: string);
var
G: TGraph;
begin
try
G := TGraph.CreateFromFile(URL, Graphs.Count);
except
on E: Exception do
begin
MessageOK(Window, Format('Error when opening graph from file "%s": %s',
[URL, E.Message]));
Exit;
end;
end;
Graphs.Add(G);
end;
{ This creates new TGraph instance using CreateFromExpression
and adds it to Graphs list.
If parsing expression fails, it will display nice MessageOK dialog.
It also takes care of setting AColorNumber parameter for TGraph.Create
as it should be. }
procedure GraphsAddFromExpression(const Expression: string;
const X1, X2, XStep: string);
var
G: TGraph;
begin
try
G := TGraph.CreateFromExpression(Expression, X1, X2, XStep, Graphs.Count);
except
on E: ECasScriptSyntaxError do
begin
MessageOK(Window, Format(
'Error when parsing function expression at position %d: %s',
[E.LexerTextPos, E.Message]));
Exit;
end;
on E: ECasScriptError do
begin
MessageOK(Window, Format(
'Error %s in function expression: %s',
[E.ClassName, E.Message]));
Exit;
end;
end;
Graphs.Add(G);
end;
{ view --------------------------------------------------------------------- }
type
{ View to contain whole UI and to handle events, like update and menu clicks. }
TMyView = class(TCastleView)
public
procedure MenuClick(const Item: TMenuItem);
procedure Update(const SecondsPassed: Single; var HandleInput: boolean); override;
function Motion(const Event: TInputMotion): Boolean; override;
procedure Render; override;
end;
var
MyView: TMyView;
procedure TMyView.Render;
{ Transform X, Y into graph coordinate-space. }
function Transform2(const X, Y: Single): TVector2;
begin
Result := Vector2(
(X * ScaleX) + MoveX,
(Y * ScaleY) + MoveY
);
end;
{ Draws grid, numbers scale and numbers.
Odpowiednie parametry showXxx okreslaja co dokladnie narysowac -
dowolna kombinacja trzech powyzszych elementow moze byc wiec narysowana.
Parametry xxxKol okreslaja kolory odpowiednich elementow.
Parametr LiczbowyString ma zastosowanie tylko do rysowania podzialki liczbowej.
Przy kazdej kresce na osi bedzie pisany tekst Format(LiczbowyString, [i, i*krok])
gdzie i to wielokrotnosc kroku o jaka dana kreska jest wysunieta.
Przykladowe wartosci LiczbowyTekst to '%d', '%d*Pi', '%1: f'. }
procedure ShowGridNumScale(
const krok: extended; const LiczbowyString: string;
showGrid, showNumScale, showNumbers: boolean;
const gridKol, NumScaleKol, NumbersKol: TCastleColor);
var
i, minx, maxx, miny, maxy: integer;
RenderPoints: TVector2List;
const
NumScaleLength =10;
begin
if not (showGrid or showNumScale or showNumbers) then exit;
{ minx to najmniejsza wartosc taka ze minx*krok miesci sie na ekranie.
Podobnie maxx, miny, maxy. }
minx := Ceil(XWindowToUklad(0) / krok);
miny := Ceil(YWindowToUklad(0) / krok);
maxx := Floor(XWindowToUklad(Window.Width ) / krok);
maxy := Floor(YWindowToUklad(Window.Height) / krok);
if ShowGrid then
begin
RenderPoints := TVector2List.Create;
try
{ przesuwajac sie o wartosc integer unikamy przy okazji kumulacji bledow
zaokraglen zmiennoprzecinkowych gdybysmy przesuwali sie o krok
zmieniajac jakas wartosc o +krok w kazdym kroku petli. }
for i := minx to maxx do
begin
RenderPoints.Add(Transform2(i*krok, YWindowToUklad(0)));
RenderPoints.Add(Transform2(i*krok, YWindowToUklad(Window.Height)));
end;
for i := miny to maxy do
begin
RenderPoints.Add(Transform2(XWindowToUklad(0), i*krok));
RenderPoints.Add(Transform2(XWindowToUklad(Window.Width), i*krok));
end;
DrawPrimitive2D(pmLines, RenderPoints.ToArray, gridKol);
finally FreeAndNil(RenderPoints) end;
end;
if ShowNumScale then
begin
RenderPoints := TVector2List.Create;
try
{ przesuwajac sie o wartosc integer unikamy przy okazji kumulacji bledow
zaokraglen zmiennoprzecinkowych gdybysmy przesuwali sie o krok
zmieniajac jakas wartosc o +krok w kazdym kroku petli. }
for i := minx to maxx do
begin
RenderPoints.Add(Transform2(i*krok, -NumScaleLength/ScaleY));
RenderPoints.Add(Transform2(i*krok,+ NumScaleLength/ScaleY));
end;
for i := miny to maxy do
begin
RenderPoints.Add(Transform2(-NumScaleLength/ScaleX, i*krok));
RenderPoints.Add(Transform2(+NumScaleLength/ScaleX, i*krok));
end;
DrawPrimitive2D(pmLines, RenderPoints.ToArray, NumScaleKol);
finally FreeAndNil(RenderPoints) end;
end;
if ShowNumbers then
begin
for i := minx to maxx do
UIFont.Print(Transform2(i*krok, 0), NumbersKol,
Format(LiczbowyString, [i, i*krok]));
for i := miny to maxy do
UIFont.Print(Transform2(0, i*krok), NumbersKol,
Format(LiczbowyString, [i, i*krok]));
end;
end;
procedure ShowGraph(const Graph: TGraph);
var
i: integer;
Points: TXYList;
RenderPoints: TVector2List;
begin
if Graph.Visible then
begin
Points := Graph.Points;
RenderPoints := TVector2List.Create;
try
if BoolOptions[boOnlyPoints] then
begin
for i := 0 to Points.Count - 1 do
if not points.L[i].break then
RenderPoints.Add(Transform2(points.L[i].x, points.L[i].y));
DrawPrimitive2D(pmPoints, RenderPoints.ToArray, Graph.Color,
bsSrcAlpha, bdOneMinusSrcAlpha, { ForceBlending } false,
{ LineWidth } 1, { PointSize } 3);
end else
begin
for i := 0 to Points.Count - 1 do
if points.L[i].break then
begin
DrawPrimitive2D(pmLineStrip, RenderPoints.ToArray, Graph.Color);
RenderPoints.Clear;
end else
RenderPoints.Add(Transform2(points.L[i].x, points.L[i].y));
DrawPrimitive2D(pmLineStrip, RenderPoints.ToArray, Graph.Color);
end;
finally FreeAndNil(RenderPoints) end;
if BoolOptions[boPointsCoords] then
begin
for i := 0 to Points.Count-1 do
if not points.L[i].break then
UIFont.Print(Transform2(points.L[i].x, points.L[i].y), Graph.Color,
Format('(%f,%f)', [points.L[i].x, points.L[i].y]));
end;
end;
end;
const
CrosshairStipple: TLineStipple = (Factor: 10; Pattern: $AAAA);
var
i, j: integer;
TextY: Single;
S: string;
begin
inherited;
RenderContext.Clear([cbColor], ColorScheme^[ciBG]);
ShowGridNumScale(1, '%d',
BoolOptions[boGrid1], BoolOptions[boNumScale1], BoolOptions[boNumbers1],
ColorScheme^[ciGrid1], ColorScheme^[ciNumScale1], ColorScheme^[ciNumbers1]);
ShowGridNumScale(Pi, '%d*Pi',
BoolOptions[boGridPi], BoolOptions[boNumScalePi], BoolOptions[boNumbersPi],
ColorScheme^[ciGridPi], ColorScheme^[ciNumScalePi], ColorScheme^[ciNumbersPi]);
ShowGridNumScale(CustomSize, '%1:f',
BoolOptions[boGridCustom], BoolOptions[boNumScaleCustom], BoolOptions[boNumbersCustom],
ColorScheme^[ciGridCustom], ColorScheme^[ciNumScaleCustom], ColorScheme^[ciNumbersCustom]);
if BoolOptions[boMainXYLines] then
begin
DrawPrimitive2D(pmLines, [
Transform2(0, YWindowToUklad(0)),
Transform2(0, YWindowToUklad(Window.Height)),
Transform2(XWindowToUklad(0), 0),
Transform2(XWindowToUklad(Window.Width), 0)
], ColorScheme^[ciMainXYLines]);
end;
for j := 0 to Graphs.Count-1 do ShowGraph(Graphs[j]);
if BoolOptions[boCrosshair] then
begin
DrawPrimitive2D(pmLines, CrosshairStipple, [
Vector2(Window.Width/2, 0),
Vector2(Window.Width/2, Window.Height),
Vector2(0, Window.Height/2),
Vector2(Window.Width, Window.Height/2)
], ColorScheme^[ciCrosshair]);
UIFont.Print(Transform2(Window.Width div 2, Window.Height div 2),
ColorScheme^[ciCrosshair],
Format('%f, %f', [XWindowToUklad(Window.Width/2), YWindowToUklad(Window.Height/2)]));
end;
if BoolOptions[boMap] then
begin
TextY := 10;
UIFont.Print(10, TextY, ColorScheme^[ciCrosshair],
Format('Scale %f, %f. Move %f, %f. %d graphs.',
[ScaleX, ScaleY, MoveX, MoveY, Graphs.Count]));
for i := 0 to Graphs.Count-1 do
begin
TextY += UIFont.Height + 2;
DrawPrimitive2D(pmLines, CrosshairStipple, [
Vector2(5 , TextY + UIFont.Height / 2),
Vector2(15, TextY + UIFont.Height / 2)
], Graphs[i].Color);
S := Format('%d - %s', [i, Graphs[i].Name]);
if not Graphs[i].Visible then
S := '{' + S + '}';
UIFont.Print(20, TextY, Graphs[i].Color, S);
end;
end;
end;
var
UpdateFirst: boolean = true;
procedure TMyView.Update(const SecondsPassed: Single; var HandleInput: boolean);
function SpeedFactor: Single;
begin
Result := SecondsPassed * 50; { to make everything time-based }
if Container.Pressed[keyCtrl] then Result *= 10;
end;
procedure MultiplyGLScale(Multiplier: Single);
begin
Multiplier := Power(Multiplier, SpeedFactor);
if (ScaleX * Multiplier < 0.00001) or
(ScaleY * Multiplier < 0.00001) then
Exit;
ScaleX *= Multiplier;
ScaleY *= Multiplier;
{ przy kazdym skalowaniu robiac tez odpowiednie przesuniecie zapewniamy sobie
ze po wykonaniu skalowania bedziemy stac w tym samym miejscu Graphu.
Innymi slowy, "tak naprawde" wykonujemy kiepskie skalowanie wzgledem srodka
ukladu wspolrzednych (0, 0) ale potem odpowiednio sie przesuwamy tak aby wrocic
tak gdzie bylismy !. }
MoveX:=(MoveX-Window.Width/2 )*Multiplier + Window.Width /2;
MoveY:=(MoveY-Window.Height/2)*Multiplier + Window.Height/2;
Window.Invalidate;
end;
procedure MultiplyGLScaleX(Multiplier: Single);
begin
Multiplier := Power(Multiplier, SpeedFactor);
if ScaleX * Multiplier < 0.00001 then
Exit;
ScaleX *= Multiplier;
MoveX := (MoveX-Window.Width/2) * Multiplier + Window.Width/2;
Window.Invalidate;
end;
procedure MultiplyGLScaleY(Multiplier: Single);
begin
Multiplier := Power(Multiplier, SpeedFactor);
if ScaleY * Multiplier < 0.00001 then
Exit;
ScaleY *= Multiplier;
MoveY := (MoveY-Window.Height/2) * Multiplier + Window.Height/2;
Window.Invalidate;
end;
procedure AddGL(var Value: Single; const Change: Single);
begin
Value += Change * SpeedFactor;
Window.Invalidate;
end;
{ Interpretuje wszystkie pozostale ParStr(1) .. ParStr(ParCount) jako
nazwy plikow (lub stdin jesli sa '-').
Laduje z nich graphs, dodajac je do Graphs list. }
procedure OpenGraphsFromParameters;
var
I: integer;
begin
for I := 1 to Parameters.High do
GraphsAddFromFile(Parameters[I]);
end;
begin
inherited;
if UpdateFirst then
begin
OpenGraphsFromParameters;
UpdateGraphsMenu;
HomeState;
UpdateFirst := false;
end;
if Container.Pressed[keyArrowUp] then AddGL(MoveY, -1);
if Container.Pressed[keyArrowDown] then AddGL(MoveY, +1);
if Container.Pressed[keyArrowRight] then AddGL(MoveX, -1);
if Container.Pressed[keyArrowLeft] then AddGL(MoveX, +1);
if Container.Pressed[keyNumpadMinus] or
Container.Pressed[keyMinus] or
Container.Pressed.Characters['-'] then
MultiplyGLScale(1 / 1.1);
if Container.Pressed[keyNumpadPlus ] or
Container.Pressed[keyPlus ] or
Container.Pressed.Characters['+'] then
MultiplyGLScale(1.1);
if Container.Pressed[keyX] then
begin
if Container.Pressed[keyShift] then
MultiplyGLScaleX(1 / 1.1)
else
MultiplyGLScaleX(1.1);
end;
if Container.Pressed[keyY] then
begin
if Container.Pressed[keyShift] then
MultiplyGLScaleY(1 / 1.1)
else
MultiplyGLScaleY(1.1);
end;
end;
function TMyView.Motion(const Event: TInputMotion): Boolean;
begin
Result := inherited;
if buttonLeft in Event.Pressed then
begin
{ zmien MoveX i MoveY o tyle o ile zmienila sie pozycja myszy od
ostatniego Motion/Down }
MoveX := MoveX + Event.Position[0] - Event.OldPosition[0];
MoveY := MoveY + Event.Position[1] - Event.OldPosition[1];
end;
end;
{ menu-related things -------------------------------------------------------- }
var
OpenURL: string = '';
RecentMenu: TWindowRecentFiles;
{ This opens/adds graph from file. }
procedure OpenOrAddGraphFromFileCore(Open: boolean; const URL: string);
begin
if Open then
begin
Graphs.Clear;
GraphsAddFromFile(URL);
UpdateGraphsMenu;
HomeState;
end else
begin
GraphsAddFromFile(URL);
UpdateGraphsMenu;
{ Calling HomeState is not desirable here, maybe user wants to keep
previous view settings, to see already existing graphs as they were. }
end;
RecentMenu.Add(URL);
OpenURL := URL;
end;
type
THelper = class
class procedure OpenRecent(const URL: string);
end;
class procedure THelper.OpenRecent(const URL: string);
begin
OpenOrAddGraphFromFileCore(false, URL);
end;
function GetMainMenu(): TMenu;
var
M, M2: TMenu;
bo: TBoolOption;
NextRecentMenuItem: TMenuEntry;
begin
Result := TMenu.Create('Main menu');
M := TMenu.Create('_File');
M.Append(TMenuItem.Create('_Open Graph from File ...', 101, CtrlO));
M.Append(TMenuItem.Create('_Add Graph from File ...', 102, CtrlA));
NextRecentMenuItem := TMenuSeparator.Create;
M.Append(NextRecentMenuItem);
RecentMenu.NextMenuItem := NextRecentMenuItem;
M.Append(TMenuItem.Create('_Exit', 10, CharEscape));
Result.Append(M);
M := TMenu.Create('F_unctions');
M.Append(TMenuItem.Create('_Open Graph with Function ...', 201));
M.Append(TMenuItem.Create('_Add Graph with Function ...', 202));
M.Append(TMenuSeparator.Create);
M2 := TMenu.Create('Add Graph with _Sample Function');
M2.Append(TMenuItem.Create('_sin(x) (on [-10 * Pi, 10 * Pi], with 0.1 step)', 203));
M2.Append(TMenuItem.Create('_cos(x) (on [-10 * Pi, 10 * Pi], with 0.1 step)', 204));
M2.Append(TMenuItem.Create('sin(x) > cos(x) (on [-10 * Pi, 10 * Pi], with 0.1 step)', 205));
M.Append(M2);
Result.Append(M);
M := TMenu.Create('_Graphs');
M.Append(TMenuItem.Create('_Hide All Graphs', 30));
M.Append(TMenuItem.Create('_Show All Graphs', 31));
M.Append(TMenuSeparator.Create);
M.Append(TMenuItem.Create('_Close All Graphs', 103));
M.Append(TMenuSeparator.Create);
GraphsListMenu := M;
Result.Append(M);
M := TMenu.Create('_View');
M.Append(TMenuItem.Create('Dark Colors', 4000));
M.Append(TMenuItem.Create('Light Colors', 4010));
M.Append(TMenuSeparator.Create);
for bo := Low(bo) to High(bo) do
M.Append(TMenuItemChecked.Create(
BoolOptionsMenuNames[bo], 900+Ord(bo), BoolOptionsKeys[bo],
BoolOptions[bo], true));
Result.Append(M);
M := TMenu.Create('_Other');
M.Append(TMenuItem.Create('_Restore Default View', 21, keyHome));
M.Append(TMenuItemToggleFullScreen.Create(Window.FullScreen));
M.Append(TMenuItem.Create('_Save Screen ...', 23, keyF5));
Result.Append(M);
M := TMenu.Create('_Help');
M.Append(TMenuItem.Create('Help About Controls (Keys and Mouse)', 5, keyF1));
M.Append(TMenuSeparator.Create);
M.Append(TMenuItem.Create('About glplotter' , 6));
Result.Append(M);
end;
var
LastInputX1: string = '-100';
LastInputX2: string = '100';
LastInputXStep: string = '0.1';
procedure TMyView.MenuClick(const Item: TMenuItem);
procedure SetVisibleAll(Value: boolean);
var i: Integer;
begin
for i := 0 to Graphs.Count - 1 do
Graphs[i].Visible := Value;
Window.Invalidate;
end;
procedure OpenOrAddGraphFromFile(Open: boolean);
var
URL, S: string;
begin
URL := OpenURL;
if Open then
S := 'Open graph from file' else
S := 'Add graph from file';
if Window.FileDialog(S, URL, true) then
OpenOrAddGraphFromFileCore(Open, URL);
end;
function GetExpression(out Expression: string;
out X1, X2, XStep: string): boolean;
const
SYouCan = nl + nl + '(You can use any constant mathematical expression here, ' +
'e.g. try "10 * Pi")';
begin
Expression := '';
X1 := LastInputX1;
X2 := LastInputX2;
XStep := LastInputXStep;
Result :=
MessageInputQuery(Window,
'Function expression :' + nl + nl +
'(where x is the function argument, e.g. "x * 2")',
Expression) and
MessageInputQuery(Window, 'First X value :' + SYouCan, X1) and
MessageInputQuery(Window, 'Last X value :' + SYouCan, X2) and
MessageInputQuery(Window, 'X value step :' + SYouCan, XStep);
LastInputX1 := X1;
LastInputX2 := X2;
LastInputXStep := XStep;
end;
procedure OpenGraphFromExpression;
var
Expression: string;
X1, X2, XStep: string;
begin
if GetExpression(Expression, X1, X2, XStep) then
begin
Graphs.Clear;
GraphsAddFromExpression(Expression, X1, X2, XStep);
UpdateGraphsMenu;
HomeState;
end;
end;
procedure AddGraphFromExpression;
var
Expression: string;
X1, X2, XStep: string;
begin