diff --git a/applications/lazimageeditor/colorpalette.pas b/applications/lazimageeditor/colorpalette.pas new file mode 100644 index 000000000..2735036ec --- /dev/null +++ b/applications/lazimageeditor/colorpalette.pas @@ -0,0 +1,366 @@ +{ + /*************************************************************************** + ColorPalette.pas + + + ***************************************************************************/ + + ***************************************************************************** + * * + * See the file COPYING.modifiedLGPL, included in this distribution, * + * for details about the copyright. * + * * + * This program 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. * + * * + ***************************************************************************** + + Author: Tom Gregorovic (_tom_@centrum.cz) + + Abstract: + Color palette grid with custom palette support. + The OnColorPick event is fired when user picks a color. + The LoadPalette procedure loads custom palette. + Custom palette example: + + $COLS 8 + # sets count of palette grid columns + + 0,0,0 + # inserts color r,g,b + 255,255,255 + + $NONE + # inserts empty palette grid cell + + $BLENDWB 128,128,128 3 + # creates color gradient white -> color -> black with specified steps + +} +unit ColorPalette; + +{$ifdef fpc} + {$mode objfpc}{$H+} +{$endif} + +interface + +uses + Classes, SysUtils, LResources, Controls, Forms, Graphics, Math, + LCLType; + +type + + TColorMouseEvent = procedure (Sender: TObject; AColor: TColor; Shift: TShiftState) of Object; + + { TCustomColorPalette } + + TCustomColorPalette = class(TGraphicControl) + private + FButtonHeight: Integer; + FButtonWidth: Integer; + FCols: Integer; + FOnColorMouseMove: TColorMouseEvent; + FOnColorPick: TColorMouseEvent; + FRows: Integer; + FColors: TList; + function GetColors(Index: Integer): TColor; + procedure SetButtonHeight(const AValue: Integer); + procedure SetButtonWidth(const AValue: Integer); + procedure SetColors(Index: Integer; const AValue: TColor); + procedure UpdateSize; + protected + procedure MouseDown(Button: TMouseButton; Shift:TShiftState; X, Y:Integer); override; + procedure MouseMove(Shift:TShiftState; X, Y:Integer); override; + procedure ColorPick(AColor: TColor; Shift: TShiftState); dynamic; + procedure ColorMouseMove(AColor: TColor; Shift: TShiftState); dynamic; + public + constructor Create(TheOwner: TComponent); override; + destructor Destroy; override; + procedure Paint; override; + public + procedure LoadPalette(const FileName: String); + + property ButtonWidth: Integer read FButtonWidth write SetButtonWidth; + property ButtonHeight: Integer read FButtonHeight write SetButtonHeight; + property Colors[Index: Integer]: TColor read GetColors write SetColors; + + property OnColorPick: TColorMouseEvent read FOnColorPick write FOnColorPick; + property OnColorMouseMove: TColorMouseEvent read FOnColorMouseMove write FOnColorMouseMove; + + property Height stored False; + property Width stored False; + end; + + TColorPalette = class(TCustomColorPalette) + published + property Align; + property Anchors; + property BorderSpacing; + property ButtonWidth; + property ButtonHeight; + property Color; + property Constraints; + property DragCursor; + property DragKind; + property DragMode; + property Enabled; + property Hint; + property ParentColor; + property ParentShowHint; + property PopupMenu; + property ShowHint; + property Visible; + + property OnChangeBounds; + property OnClick; + property OnColorMouseMove; + property OnColorPick; + property OnDblClick; + property OnMouseDown; + property OnMouseMove; + property OnMouseUp; + property OnMouseEnter; + property OnMouseLeave; + property OnResize; + end; + + procedure Register; + +implementation + +procedure Register; +begin + RegisterComponents('Misc', [TColorPalette]); +end; + +{ TCustomColorPalette } + +procedure TCustomColorPalette.SetButtonHeight(const AValue: Integer); +begin + if FButtonHeight = AValue then Exit; + FButtonHeight := AValue; + if FButtonHeight < 1 then FButtonHeight := 1; + UpdateSize; +end; + +function TCustomColorPalette.GetColors(Index: Integer): TColor; +begin + Result := TColor(FColors.Items[Index]); +end; + +procedure TCustomColorPalette.SetButtonWidth(const AValue: Integer); +begin + if FButtonWidth = AValue then Exit; + FButtonWidth := AValue; + if FButtonWidth < 1 then FButtonWidth := 1; + UpdateSize; +end; + +procedure TCustomColorPalette.SetColors(Index: Integer; const AValue: TColor); +begin + FColors.Items[Index] := Pointer(AValue); +end; + +procedure TCustomColorPalette.UpdateSize; +begin + if (FCols = 0) or (FColors.Count = 0) then FRows := 0 + else + FRows := Ceil(FColors.Count / FCols); + + SetBounds(Left, Top, FCols * FButtonWidth + 1, FRows * FButtonHeight + 1) +end; + +procedure TCustomColorPalette.MouseDown(Button: TMouseButton; + Shift: TShiftState; X, Y: Integer); +var + C: TColor; +begin + inherited; + + X := X div FButtonWidth; + Y := Y div FButtonHeight; + + if X + Y * FCols < FColors.Count then + begin + C := TColor(FColors.Items[X + Y * FCols]); + if C <> clNone then ColorPick(C, Shift); + end; +end; + +procedure TCustomColorPalette.MouseMove(Shift: TShiftState; X, Y: Integer); +var + C: TColor; +begin + inherited; + + X := X div FButtonWidth; + Y := Y div FButtonHeight; + + if X + Y * FCols < 0 then + Exit; + if X + Y * FCols < FColors.Count then + begin + C := TColor(FColors.Items[X + Y * FCols]); + if C <> clNone then ColorMouseMove(C, Shift); + end; +end; + +procedure TCustomColorPalette.ColorPick(AColor: TColor; Shift: TShiftState); +begin + if Assigned(FOnColorPick) then FOnColorPick(Self, AColor, Shift); +end; + +procedure TCustomColorPalette.ColorMouseMove(AColor: TColor; Shift: TShiftState); +begin + if Assigned(FOnColorMouseMove) then FOnColorMouseMove(Self, AColor, Shift); +end; + +constructor TCustomColorPalette.Create(TheOwner: TComponent); +begin + inherited; + + FColors := TList.Create; + FButtonWidth := 12; + FButtonHeight := 12; + ControlStyle := ControlStyle + [csFixedWidth, csFixedHeight]; + + FCols := 8; + + FColors.Add(Pointer(clBlack)); + FColors.Add(Pointer(clGray)); + FColors.Add(Pointer(clMaroon)); + FColors.Add(Pointer(clOlive)); + FColors.Add(Pointer(clGreen)); + FColors.Add(Pointer(clTeal)); + FColors.Add(Pointer(clNavy)); + FColors.Add(Pointer(clPurple)); + + FColors.Add(Pointer(clWhite)); + FColors.Add(Pointer(clSilver)); + FColors.Add(Pointer(clRed)); + FColors.Add(Pointer(clYellow)); + FColors.Add(Pointer(clLime)); + FColors.Add(Pointer(clAqua)); + FColors.Add(Pointer(clBlue)); + FColors.Add(Pointer(clFuchsia)); + + UpdateSize; +end; + +destructor TCustomColorPalette.Destroy; +begin + FColors.Free; + + inherited; +end; + +procedure TCustomColorPalette.Paint; +var + I, X, Y: Integer; +begin + Canvas.Pen.Color := clBlack; + for I := 0 to Pred(FColors.Count) do + begin + Y := I div FCols; + X := I mod FCols; + if TColor(FColors.Items[I]) <> clNone then + begin + Canvas.Brush.Color := TColor(FColors.Items[I]); + Canvas.Rectangle(Bounds(X * FButtonWidth, Y * FButtonHeight, FButtonWidth, + FButtonHeight)); + end; + end; +end; + +procedure TCustomColorPalette.LoadPalette(const FileName: String); +var + F: TextFile; + Line: String; + C: TColor; + + function ParseColor(var S: String): TColor; + var + R, G, B: Integer; + I: Integer; + begin + R := StrToIntDef(Copy(S, 1, Pos(',', S) - 1), 0); + Delete(S, 1, Pos(',', S)); + G := StrToIntDef(Copy(S, 1, Pos(',', S) - 1), 0); + Delete(S, 1, Pos(',', S)); + + S := TrimLeft(S); + I := 1; + while (I <= Length(S)) and (S[I] in ['0'..'9']) do Inc(I); + B := StrToIntDef(Copy(S, 1, Pred(I)), 0); + Delete(S, 1, Pred(I)); + + Result := RGBToColor(Max(0, Min(R, 255)), Max(0, Min(G, 255)), Max(0, Min(B, 255))); + end; + + procedure BlendWBColor(Color: TColor; Steps: Integer); + var + I: Integer; + R, G, B, NR, NG, NB: Byte; + begin + RedGreenBlue(Color, R, G, B); + + for I := 1 to Steps do + begin + NR := Round((R * I + 255 * (Steps + 1 - I)) / (Steps + 1)); + NG := Round((G * I + 255 * (Steps + 1 - I)) / (Steps + 1)); + NB := Round((B * I + 255 * (Steps + 1 - I)) / (Steps + 1)); + FColors.Add(Pointer(RGBToColor(NR, NG, NB))); + end; + + FColors.Add(Pointer(Color)); + + for I := Steps downto 1 do + begin + NR := Round(R * I / (Steps + 1)); + NG := Round(G * I / (Steps + 1)); + NB := Round(B * I / (Steps + 1)); + FColors.Add(Pointer(RGBToColor(NR, NG, NB))); + end; + end; + +begin + AssignFile(F, FileName); + try + Reset(F); + + FColors.Clear; + FCols := 1; + while not EOF(F) do + begin + ReadLn(F, Line); + Line := Trim(Line); + if Length(Line) < 2 then Continue; + if Line[1] = '#' then Continue; + if Line[1] = '$' then + begin + if Copy(Line, 2, 4) = 'NONE' then FColors.Add(Pointer(clNone)); + if Copy(Line, 2, 4) = 'COLS' then FCols := StrToIntDef(Copy(Line, 6, MaxInt), 8); + if Copy(Line, 2, 7) = 'BLENDWB' then + begin + Delete(Line, 1, 8); + C := ParseColor(Line); + BlendWBColor(C, StrToInt(Line)); + end; + end + else + if Pos(',', Line) > 0 then FColors.Add(Pointer(ParseColor(Line))); + end; + finally + Close(F); + end; + + UpdateSize; +end; + +initialization +{$I colorpalette.lrs} + +end. +