[일반/컴포넌트] 달력에 그림이나 기호 그리기

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ExtCtrls, Mask, ComCtrls, Printers;

type
  TMainForm = class(TForm)
    Button1: TButton;
    ME_yyyymm: TMaskEdit;
    Image_Schedule: TImage;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
    procedure DrawBackGround(yyyymm: String);
    procedure DrawProgressBar(yyyymm, StartDate, EndDate: String; iColor: TColor);
    procedure DrawEvent(yyyymm, EventDate, Event: String; iColor: TColor);
end;

const
  DayOfWeekNames: array[0..6] of String =('일','월','화','수','목','금','토');
  NameHeight = 22;

var
  MainForm: TMainForm;
  OccupationEvent: array[0..31] of Integer;
  OccupationBar: array[0..31] of Integer;
  MasterCanvas: TCanvas;

implementation
{$R *.DFM}

procedure TMainForm.FormCreate(Sender: TObject);
begin
  Image_Schedule.Picture.Bitmap := TBitmap.Create; {bitmap 생성}
  MasterCanvas := Image_Schedule.Picture.Bitmap.Canvas;
  ME_yyyymm.EditMask := '####.##;0;_';
  ME_yyyymm.Text := '199905';
end;

{===============================================================================
                주어진 년월의 마지막 일자를 구한다
===============================================================================}
function Get_LastDay(yyyy,mm: Integer): Integer;
var
  MyDate: TDateTime;
  Convert_OK: Boolean;
  dd: Integer;
begin
  Convert_OK := True;
  dd := 28;
  while Convert_OK do
  begin
    try
      MyDate := EncodeDate(yyyy, mm, dd);
    except
      on EConvertError do
         Convert_OK := False;
    end;
    if Convert_OK then
      Inc(dd)
    else
      Dec(dd);
  end;
  Get_LastDay := dd;
end;

{===============================================================================
              주어진 달의 주수를 구한다(마지막 주의 의미)
===============================================================================}
function Get_weeks(yyyy,mm: Integer): Integer;
var
  MyDate: TDateTime;
  i, weeks: Integer;
  Convert_OK: Boolean;
begin
  weeks := 0;
  for i := 1 to 31 do
  begin
    try
      Convert_OK := True;
      MyDate := EncodeDate(yyyy, mm, i);
    except
      on EConvertError do
         Convert_OK := False;
    end;
    if Convert_OK then
      if (DayOfWeek(MyDate) = 7) or (Get_LastDay(yyyy,mm) = i) then {토요일이나 달의 마지막이면 1주}
        Inc(weeks);
  end;
  Get_weeks := weeks;
end;

{===============================================================================
주어진 달의 주에 해당하는 날짜from, to, 주의 첫번째 날의 요일번호를 구한다
===============================================================================}
procedure Get_weekfrto(yyyy,mm,week:Integer; var weekfrom:Integer; var weekto:Integer; var dayweek:Integer);
var
  MyDate: TDateTime;
  i, j, weeks: Integer;
  Convert_OK: Boolean;
begin
  weekfrom := 0;
  weekto   := 0;
  dayweek  := 0;

  weeks := 0;
  for i := 1 to 31 do
  begin
    try
      Convert_OK := True;
      MyDate := EncodeDate(yyyy, mm, i);
    except
      on EConvertError do
         Convert_OK := False;
    end;
    if Convert_OK then
    begin
      if (DayOfWeek(MyDate) = 7) or (Get_LastDay(yyyy,mm) = i) then {토요일이나 달의 마지막이면 1주}
        Inc(weeks);
      if weeks = week then
      begin
        weekto := i; {주의 마지막 일자}
        for j := i downto 1 do
        begin
          MyDate := EncodeDate(yyyy, mm, j);
          if (DayOfWeek(MyDate) = 1) or (j = 1) then {일요일이나 그달의 1일이면 주의 시작 일자}
          begin
            weekfrom := j; {주의 시작 일자}
            dayweek  := DayOfWeek(MyDate); {주의 첫번째 날의 요일번호}
            Break;
          end;
        end;
        System.Exit;
      end;
    end;
  end;
end;

function indc_date(yyyymmdd: String; disc: Integer): String;
var
  yyyy,mm,dd: Integer;
  MyDate: TDateTime;
  Convert_OK: Boolean;
begin
  yyyy := StrToIntDef(Copy(yyyymmdd,1,4),-1);
  mm   := StrToIntDef(Copy(yyyymmdd,5,2),-1);
  dd   := StrToIntDef(Copy(yyyymmdd,7,2),-1);
  if (yyyy <= 0) or (mm <= 0) or (dd <= 0) then
  begin
    indc_date := '';
    System.exit;
  end;

  if disc = 0 then
  begin
    try
      Convert_OK := True;
      MyDate := EncodeDate(yyyy, mm, dd);
    except
      on EConvertError do
         Convert_OK := False;
    end;
    if Convert_OK then
    begin
      indc_date := FormatDateTime('yyyymmdd', MyDate);
    end
    else
    begin
      indc_date := '';
    end;
  end
  else
  begin
    Convert_OK := True;
    try
      MyDate := EncodeDate(yyyy, mm, dd);
    except
      on EConvertError do
         Convert_OK := False;
    end;
    if Convert_OK then
    begin
      indc_date := FormatDateTime('yyyymmdd', MyDate+disc);
    end
    else
    begin
      indc_date := '';
    end;
  end;
end;

{===============================================================================
                주어진 년,월,일이 들어가는 주를 구한다
===============================================================================}
function Get_thisweek(yyyy,mm,dd: Integer): Integer;
var
  MyDate: TDateTime;
  i, weeks: Integer;
  Convert_OK: Boolean;
begin
  weeks := 0;
  for i := 1 to 31 do
  begin
    try
      Convert_OK := True;
      MyDate := EncodeDate(yyyy, mm, i);
    except
      on EConvertError do
         Convert_OK := False;
    end;
    if Convert_OK then
      if (DayOfWeek(MyDate) = 7) or (Get_LastDay(yyyy,mm) = i) then {토요일이나 달의 마지막이면 1주}
      begin
        Inc(weeks);
        if dd <= i then // 해당 주를 찾았다
          Break;
      end;
  end;
  Get_thisweek := weeks;
end;

function DayOfWeekNum(yyyymmdd: String): Integer;
var
  yyyy,mm,dd: Integer;
  MyDate: TDateTime;
begin
  yyyy := StrToIntDef(Copy(yyyymmdd,1,4),-1);
  mm   := StrToIntDef(Copy(yyyymmdd,5,2),-1);
  dd   := StrToIntDef(Copy(yyyymmdd,7,2),-1);

  Result := -1;
  try
    MyDate := EncodeDate(yyyy, mm, dd);
    Result := DayOfWeek(MyDate);
  except
    on EConvertError do
       Result := -1;
  end;
end;

procedure TMainForm.DrawBackGround(yyyymm: String);
var
  max_day, max_week: Integer;
  day_width, day_height: Integer;
  weekfrom, weekto, dayweek: Integer;
  i, j, k, yyyy, mm: Integer;
  temp: String;
begin
  yyyy := StrToIntDef(Copy(yyyymm,1,4),0);
  mm   := StrToIntDef(Copy(yyyymm,5,2),0);
  if (yyyy = 0) or (mm = 0) then
    System.Exit;

  for i := Low(OccupationEvent) to High(OccupationEvent) do
    OccupationEvent[i] := 0;
  for i := Low(OccupationBar) to High(OccupationBar) do
    OccupationBar[i] := 0;

  // 달의 마지막일자
  max_day := Get_LastDay(yyyy, mm);

  // 달의 주수
  max_week := Get_weeks(yyyy, mm);

  day_width  := Image_Schedule.Width div 7; // 가로 7칸의 각 폭
  day_height := (Image_Schedule.Height-NameHeight) div 6; // 세로 6칸의 각 높이

  MasterCanvas.Font := Self.Font;

  // 이전의 화면을 지운다
  Image_Schedule.Picture.Bitmap.Width  := Image_Schedule.Width;
  Image_Schedule.Picture.Bitmap.Height := Image_Schedule.Height;
  MasterCanvas.Brush.Color := clBtnFace;
  MasterCanvas.FillRect(Rect(0, 0, Image_Schedule.Width, Image_Schedule.Height));

  // 각 일자명을 그린다
  MasterCanvas.Brush.Color := clYellow;
  for i := 0 to 6 do
  begin
    MasterCanvas.Rectangle(day_width*i, 0,
                           day_width*(i+1), NameHeight);

    if i = 0 then // 일요일
      MasterCanvas.Font.Color := clRed
    else if i = 6 then // 토요일
      MasterCanvas.Font.Color := clBlue
    else // 평일
      MasterCanvas.Font.Color := clBlack;
    MasterCanvas.TextOut(day_width*i+5, 5, DayOfWeekNames[i]);
  end;

  // 스케줄의 각 일자의 직사각형을 그린다
  MasterCanvas.Brush.Color := clWhite;
  for i := 0 to (max_week-1) do
  begin
    for j := 0 to 6 do
      MasterCanvas.Rectangle(day_width*j, day_height*i+NameHeight,
                             day_width*(j+1), day_height*(i+1)+NameHeight);

  end;

  // 스케줄의 각 일자를 출력
  k := 0;
  for i := 0 to (max_week-1) do // 달의 주수만큼
  begin
    // 주어진 달의 주에 해당하는 날짜from, to, 주의 첫번째 날의 요일번호
    Get_weekfrto(yyyy,mm,i+1, weekfrom, weekto, dayweek);
    for j := 0 to 6 do
    begin
      if ((j+1) >= dayweek) and
         ((k+1) <= max_day) then
      begin
        Inc(k);

        if j = 0 then // 일요일
          MasterCanvas.Font.Color := clRed
        else if j = 6 then // 토요일
          MasterCanvas.Font.Color := clBlue
        else // 평일
          MasterCanvas.Font.Color := clBlack;

        MasterCanvas.Brush.Color := clWhite;
        MasterCanvas.TextOut(day_width*j+5, day_height*i+5+NameHeight, inttostr(k));
      end;
    end;
  end;
end;

procedure TMainForm.DrawProgressBar(yyyymm, StartDate, EndDate: String; iColor: TColor);
var
  day_width, day_height: Integer;
  daynum, dayweek: Integer;
  yyyy, mm: Integer;
  CurDate: String;
  iPos: Integer;
begin
  yyyy := StrToIntDef(Copy(yyyymm,1,4),0);
  mm   := StrToIntDef(Copy(yyyymm,5,2),0);

  if (yyyy = 0) or (mm = 0) then
    System.Exit;

  iPos := 1;
  CurDate := StartDate; // 시작일자
  while CurDate <= EndDate do
  begin
    if Copy(CurDate,1,6) = yyyymm then // 기준월의 날짜만 그린다
    begin
      // 요일에 출력되는 막대 카운트
      OccupationBar[StrToIntDef(Copy(CurDate,7,2),0)] :=
          OccupationBar[StrToIntDef(Copy(CurDate,7,2),0)] + 1;
      if iPos < OccupationBar[StrToIntDef(Copy(CurDate,7,2),0)] then // 해당기간의 최대 카운트
        iPos := OccupationBar[StrToIntDef(Copy(CurDate,7,2),0)];
    end;
    CurDate := indc_date(CurDate, 1); // 날짜증가
  end;

  day_width  := Image_Schedule.Width div 7; // 가로 7칸의 각 폭
  day_height := (Image_Schedule.Height-NameHeight) div 6; // 세로 6칸의 각 높이

  CurDate := StartDate; // 시작일자
  while CurDate <= EndDate do
  begin
    if Copy(CurDate,1,6) = yyyymm then // 기준월의 날짜만 그린다
    begin
      daynum := Get_thisweek(StrToInt(Copy(CurDate,1,4)), // 해당 년월일의 주번호
                             StrToInt(Copy(CurDate,5,2)),
                             StrToInt(Copy(CurDate,7,2)));

      dayweek := DayOfWeekNum(CurDate); // 요일번호

      // 막대기
      MasterCanvas.Brush.Color := iColor;
      MasterCanvas.FillRect(Rect(day_width*(dayweek-1)+ 4,
                                 day_height*(daynum-1)+ day_height-(iPos*5)-2+NameHeight,
                                 day_width*(dayweek-1)+ day_width-4,
                                 day_height*(daynum-1)+ day_height-(iPos*5)+1+NameHeight));

      if CurDate = StartDate then // 시작점 그리기
        MasterCanvas.FillRect(Rect(day_width*(dayweek-1)+ 4,
                                   day_height*(daynum-1)+ day_height-(iPos*5)-2+NameHeight-1,
                                   day_width*(dayweek-1)+ 6,
                                   day_height*(daynum-1)+ day_height-(iPos*5)-2+NameHeight+1));

      if CurDate = EndDate then // 종료점 그리기
        MasterCanvas.FillRect(Rect(day_width*(dayweek-1)+ day_width-6,
                                   day_height*(daynum-1)+ day_height-(iPos*5)+1+NameHeight-1,
                                   day_width*(dayweek-1)+ day_width-4,
                                   day_height*(daynum-1)+ day_height-(iPos*5)+1+NameHeight+1));

    end;
    CurDate := indc_date(CurDate, 1); // 날짜증가
  end;
end;

procedure TMainForm.DrawEvent(yyyymm, EventDate, Event: String; iColor: TColor);
var
  day_width, day_height: Integer;
  daynum, dayweek: Integer;
  iPos: Integer;
begin
  if Copy(EventDate,1,6) <> yyyymm then // 기준월의 날짜에 속하지 않으면...
    System.Exit;

  // 요일에 출력되는 이벤트 카운트
  OccupationEvent[StrToIntDef(Copy(EventDate,7,2),0)] :=
      OccupationEvent[StrToIntDef(Copy(EventDate,7,2),0)] + 1;
  iPos := OccupationEvent[StrToIntDef(Copy(EventDate,7,2),0)];

  day_width  := Image_Schedule.Width div 7; // 가로 7칸의 각 폭
  day_height := (Image_Schedule.Height-NameHeight) div 6; // 세로 6칸의 각 높이

  daynum := Get_thisweek(StrToInt(Copy(EventDate,1,4)), // 해당 년월일의 주번호
                         StrToInt(Copy(EventDate,5,2)),
                         StrToInt(Copy(EventDate,7,2)));

  dayweek := DayOfWeekNum(EventDate); // 요일번호

  MasterCanvas.Font.Color := iColor;
  MasterCanvas.Brush.Color := clWhite;
  MasterCanvas.TextOut(day_width*(dayweek-1)+ (day_width div 2) - (MasterCanvas.TextWidth(Event) div 2),
                       day_height*(daynum-1)+ (iPos*13) +3+ NameHeight, Event);
end;

procedure TMainForm.Button1Click(Sender: TObject);
begin
  // 기준년월의 달력을 그린다
  DrawBackGround(ME_yyyymm.Text);

  // 기준년월의 각 스케쥴과 이벤트를 그린다
  DrawProgressBar(ME_yyyymm.Text, '19990506', '19990510', clRed);
  DrawEvent(ME_yyyymm.Text, '19990507', '검토', clGreen);
  DrawEvent(ME_yyyymm.Text, '19990503', '술먹는날', clGreen);
  DrawEvent(ME_yyyymm.Text, '19990513', '술먹는날', clGreen);
  DrawEvent(ME_yyyymm.Text, '19990523', '술먹는날', clGreen);

  DrawProgressBar(ME_yyyymm.Text, '19990501', '19990505', clRed);
  DrawEvent(ME_yyyymm.Text, '19990502', '생일이브', clRed);
  DrawEvent(ME_yyyymm.Text, '19990503', '생일', clRed);

  DrawProgressBar(ME_yyyymm.Text, '19990520', '19990530', clBlue);
  DrawEvent(ME_yyyymm.Text, '19990522', '검수일', clBlue);
  DrawEvent(ME_yyyymm.Text, '19990529', '토요근무', clBlue);

  DrawProgressBar(ME_yyyymm.Text, '19990503', '19990506', clBlack);
  DrawEvent(ME_yyyymm.Text, '19990503', '시연회', clBlack);

  DrawProgressBar(ME_yyyymm.Text, '19990726', '19990726', clBlue);
  DrawEvent(ME_yyyymm.Text, '19990726', '생일', clBlue);
end;

end.