MathgeomGLS

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unit faStyle;
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interface
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uses
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  Winapi.Windows,
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  Winapi.Messages,
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  System.SysUtils,
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  System.UITypes,
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  System.Variants,
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  System.Classes,
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  Vcl.Graphics,
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  Vcl.Controls,
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  Vcl.Forms,
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  Vcl.Dialogs,
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  Vcl.StdCtrls,
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  Vcl.Buttons,
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  Graf.Global1d;
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type
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  TStyleNameForm = class(TForm)
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    BitBtn1: TBitBtn;
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    StyleListBox: TListBox;
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    EditName: TEdit;
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    procedure FormShow(Sender: TObject);
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    procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
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    procedure EditKeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
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    procedure EditKeyPress(Sender: TObject; var Key: Char);
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    procedure FormKeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
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    procedure StyleListBoxDblClick(Sender: TObject);
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  private
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    StyleAltered: Boolean;
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    procedure SaveToFile;
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  public
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    Selecting: Boolean;
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  end;
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var
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  StyleNameForm: TStyleNameForm;
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//====================================================================
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implementation
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//====================================================================
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uses
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  faGraf1D,
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  faFunc1d,
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  faNumeric;
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{$R *.dfm}
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procedure TStyleNameForm.FormShow(Sender: TObject);
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  procedure ReadStyles;
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  var
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    F: File of TPlotStyle;
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    s: TPlotStyle;
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    so: TPlotStyleObject;
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  begin
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    AssignFile(F, StyleFName);
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    Reset(F);
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    while not Eof(F) do
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    begin
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      Read(F, s);
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      so := TPlotStyleObject.Create(s);
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      StyleListBox.Items.AddObject(String(s.StyleName), so);
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    end;
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    CloseFile(F);
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  end;
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begin
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  if Selecting then
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  begin
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    StyleListBox.Enabled := true;
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    StyleListBox.ItemIndex := -1;
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    EditName.Visible := false;
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    Caption := '   Select a style';
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    BitBtn1.Hint := 'OK to apply selected style.';
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    StyleListBox.Hint := 'Press Del to delete an item.';
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    Hint := 'Press escape to deselect style.'
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  end
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  else
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  begin
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    StyleListBox.Enabled := false;
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    EditName.Visible := true;
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    Caption := '   Save a style as...';
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    BitBtn1.Hint := 'OK to add the current graph style.';
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    StyleListBox.Hint := '';
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    Hint := '';
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  end;
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  StyleAltered := false;
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  if FileExists(StyleFName) then ReadStyles;
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  StyleListBox.ItemIndex := -1;
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  with Layout do
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  begin
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    if Left = 0 then
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    begin
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      Left := (Screen.Width - Width) div 2;
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      Top := (Screen.Height - Height) div 2;
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    end
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    else
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    begin
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      Left := StyleLeft;
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      Top := StyleTop;
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    end;
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  end;
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end;
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procedure TStyleNameForm.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
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  procedure ApplyStyle;
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  var
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    s: TPlotStyle;
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    so: TPlotStyleObject;
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    i: integer;
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  begin
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    if StyleListbox.ItemIndex = -1 then exit;
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    so := TPlotStyleObject(StyleListBox.Items.Objects[StyleListBox.ItemIndex]);
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    s := so.Style;
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    with GraphData do
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    begin
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      AreaAlpha := s.AreaAlpha;
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      FontName := String(s.FontName);
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      FontStyle := s.FontStyle;
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      FontSize := s.FontSize;
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      AxisWidth := s.AxisWidth;
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      xMinorGrad := s.xMinorGrad;
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      yMinorGrad := s.yMinorGrad;
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      xMajorGrad := s.xMajorGrad;
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      yMajorGrad := s.yMajorGrad;
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      MinorWidth := s.MinorWidth;
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      MajorWidth := s.MajorWidth;
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      CoordWidth := s.CoordWidth;
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      dydxWidth := s.dydxWidth;
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      d2ydx2Width := s.d2ydx2Width;
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      IntegCount := s.IntegCount;
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      ydxWidth := s.ydxWidth;
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      BackColor := s.BackColor;
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      GridColor := s.GridColor;
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      xAxisColor := s.xAxisColor;
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      yAxisColor := s.yAxisColor;
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      CoordColor := s.CoordColor;
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      dydxColor := s.dydxColor;
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      d2ydx2Color := s.d2ydx2Color;
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      ydxColor := s.ydxColor;
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      PosAreaColor := s.PosAreaColor;
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      NegAreaColor := s.NegAreaColor;
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      Grid := s.Grid;
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      with FunctionsForm.CheckListBox do
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      begin
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        for i := 0 to Count -1 do
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        with TPlotDataObject(Items.Objects[i]).Data do
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        begin
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          PlotWidth := s.Pens[i mod 12].PenWidth;
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          PlotColor := s.Pens[i mod 12].PenColor;
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        end;
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      end;
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      with NumericForm.CheckListBox do
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      begin
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        for i := 0 to Count -1 do
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        with TNumericObject(Items.Objects[i]).Data do
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        begin
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          PlotWidth := s.NumLines[i mod 12].PenWidth;
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          PlotColor := s.NumLines[i mod 12].PenColor;
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          PointSize := s.NumPoints[i mod 12].PenWidth;
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          PointColor := s.NumPoints[i mod 12].PenColor;
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        end;
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      end;
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    end;
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    MainForm.GLViewer.Buffer.BackgroundColor := GraphData.BackColor;
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  end;    { ApplyStyle }
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  function UniqueName(s: string): Boolean;
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  var
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    i: integer;
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    Found: Boolean;
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  begin
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    i := 0;
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    Found := false;
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    while not Found and (i < StyleListBox.Items.Count) do
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    begin
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      Found := LowerCase(s) = LowerCase(StyleListBox.Items[i]);
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      Inc(i);
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    end;
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    Result := not Found;
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  end;   { UniqueName }
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  procedure AddToList;
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  var
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    s: TPlotStyle;
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    so: TPlotStyleObject;
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    i: integer;
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  begin
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    with GraphData do
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    begin
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      s.AreaAlpha := AreaAlpha;
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      s.FontName := ShortString(FontName);
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      s.StyleName := ShortString(EditName.Text);
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      s.FontStyle := FontStyle;
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      s.FontSize := FontSize;
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      s.AxisWidth := AxisWidth;
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      s.xMinorGrad := xMinorGrad;
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      s.yMinorGrad := yMinorGrad;
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      s.xMajorGrad := xMajorGrad;
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      s.yMajorGrad := yMajorGrad;
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      s.MinorWidth := MinorWidth;
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      s.MajorWidth := MajorWidth;
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      s.CoordWidth := CoordWidth;
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      s.dydxWidth := dydxWidth;
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      s.d2ydx2Width := d2ydx2Width;
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      s.IntegCount := IntegCount;
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      s.ydxWidth := ydxWidth;
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      s.BackColor := BackColor;
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      s.GridColor := GridColor;
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      s.xAxisColor := xAxisColor;
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      s.yAxisColor := yAxisColor;
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      s.CoordColor := CoordColor;
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      s.dydxColor := dydxColor;
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      s.d2ydx2Color := d2ydx2Color;
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      s.ydxColor := ydxColor;
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      s.PosAreaColor := PosAreaColor;
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      s.NegAreaColor := NegAreaColor;
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      s.Grid := Grid;
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      for i := 0 to 11 do
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      begin
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        s.Pens[i].PenWidth := 1;
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        s.Pens[i].PenColor := clBlack;
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      end;
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      with FunctionsForm.CheckListBox do
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      begin
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        for i := 0 to Count -1 do
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        with TPlotDataObject(Items.Objects[i]).Data do
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        begin
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          s.Pens[i mod 12].PenWidth := PlotWidth;
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          s.Pens[i mod 12].PenColor := PlotColor;
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        end;
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      end;
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      with NumericForm.CheckListBox do
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      begin
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        for i := 0 to Count -1 do
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        with TNumericObject(Items.Objects[i]).Data do
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        begin
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          s.NumLines[i mod 12].PenWidth := PlotWidth;
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          s.NumLines[i mod 12].PenColor := PlotColor;
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          s.NumPoints[i mod 12].PenWidth := PointSize;
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          s.NumPoints[i mod 12].PenColor := PointColor;
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        end;
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      end;
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    end;
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    so := TPlotStyleObject.Create(s);
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    StyleListBox.Items.AddObject(EditName.Text, so);
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    SaveToFile;
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  end;    { AddToList }
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var
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  i: integer;
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begin
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  if Selecting then ApplyStyle
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  else if StyleAltered then
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  begin
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    EditName.Text := Trim(EditName.Text);
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    if EditName.Text <> '' then
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    begin
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      if UniqueName(EditName.Text) then AddToList
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      else
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      begin
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        MessageDlg('The Style Name entered is not unique.', mtError, [mbOK], 0);
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        CanClose := false;
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      end;
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    end;
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  end;
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  if CanClose then
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  begin
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    for i := 0 to StyleListBox.Items.Count -1
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     do StyleListBox.Items.Objects[i].Free;
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    StyleListBox.Clear;
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  end;
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  with Layout do
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  begin
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    StyleLeft := Left;
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    StyleTop := Top;
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  end;
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end;
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procedure TStyleNameForm.EditKeyDown(Sender: TObject; var Key: Word;
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                                     Shift: TShiftState);
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begin
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  if Key = VK_DELETE then StyleAltered := true;
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end;
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procedure TStyleNameForm.EditKeyPress(Sender: TObject; var Key: Char);
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begin
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  StyleAltered := true;
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end;
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procedure TStyleNameForm.FormKeyDown(Sender: TObject; var Key: Word;
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                                     Shift: TShiftState);
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begin
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  if Key = VK_ESCAPE then StyleListBox.ItemIndex := -1;
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  if (Key = VK_DELETE) and (StyleListBox.Items.Count > 0) then
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  begin
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    StyleListBox.DeleteSelected;
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    SaveToFile;
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  end;
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end;
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procedure TStyleNameForm.SaveToFile;
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var
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  F: File of TPlotStyle;
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  s: TPlotStyle;
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  so: TPlotStyleObject;
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  i: integer;
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begin
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  AssignFile(F, StyleFName);
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  Rewrite(F);
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  for i := 0 to StyleListBox.Count -1 do
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  begin
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    so := TPlotStyleObject(StyleListBox.Items.Objects[i]);
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    s := so.Style;
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    write(F, s);
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  end;
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  CloseFile(F);
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end;
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procedure TStyleNameForm.StyleListBoxDblClick(Sender: TObject);
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begin
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  Close;
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end;
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end.
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