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- //----------------------------------------------------------------------------
- // ObjectWindows - (C) Copyright 1991, 1994 by Borland International
- // Tutorial application -- step08.cpp
- //----------------------------------------------------------------------------
- #include <owl/owlpch.h>
- #include <owl/applicat.h>
- #include <owl/framewin.h>
- #include <owl/dc.h>
- #include <owl/inputdia.h>
- #include <owl/opensave.h>
- #include <classlib/arrays.h>
- #include <stdlib.h>
- #include <string.h>
- #include "step08.rc"
-
- typedef TArray<TPoint> TPoints;
- typedef TArrayIterator<TPoint> TPointsIterator;
-
- class TLine : public TPoints {
- public:
- TLine(int penSize = 1) : TPoints(10, 0, 10)
- {
- PenSize = penSize;
- }
-
- int QueryPen() const
- {
- return PenSize;
- }
-
- int QueryPen(int penSize);
-
- // The == operator must be defined for the container class, even if unused
- bool operator ==(const TLine& other) const
- {
- return &other == this;
- }
-
- friend ostream& operator <<(ostream& os, const TLine& line);
- friend istream& operator >>(istream& is, TLine& line);
-
- protected:
- int PenSize;
- };
-
- int
- TLine::QueryPen(int penSize)
- {
- if (penSize < 0)
- PenSize = 1;
- else if (penSize > 0)
- PenSize = penSize;
- return PenSize;
- }
-
- typedef TArray<TLine> TLines;
- typedef TArrayIterator<TLine> TLinesIterator;
-
- class TDrawWindow : public TWindow {
- public:
- TDrawWindow(TWindow* parent = 0);
- ~TDrawWindow()
- {
- delete DragDC;
- delete Pen;
- delete Line;
- delete Lines;
- delete FileData;
- }
-
- protected:
- TDC* DragDC;
- TPen* Pen;
- TLines* Lines;
- TLine* Line; // To hold a single line at a time that later gets
- // stuck in Lines
- TOpenSaveDialog::TData* FileData;
- bool IsDirty, IsNewFile;
-
- void SetPenSize(int newSize);
- int GetPenSize();
-
- // Override member function of TWindow
- bool CanClose();
-
- // Message response functions
- void EvLButtonDown(uint, TPoint&);
- void EvRButtonDown(uint, TPoint&);
- void EvMouseMove(uint, TPoint&);
- void EvLButtonUp(uint, TPoint&);
- void Paint(TDC&, bool, TRect&);
- void CmFileNew();
- void CmFileOpen();
- void CmFileSave();
- void CmFileSaveAs();
- void CmPenSize();
- void CmAbout();
- void SaveFile();
- void OpenFile();
-
- DECLARE_RESPONSE_TABLE(TDrawWindow);
- };
-
- DEFINE_RESPONSE_TABLE1(TDrawWindow, TWindow)
- EV_WM_LBUTTONDOWN,
- EV_WM_RBUTTONDOWN,
- EV_WM_MOUSEMOVE,
- EV_WM_LBUTTONUP,
- EV_COMMAND(CM_FILENEW, CmFileNew),
- EV_COMMAND(CM_FILEOPEN, CmFileOpen),
- EV_COMMAND(CM_FILESAVE, CmFileSave),
- EV_COMMAND(CM_FILESAVEAS, CmFileSaveAs),
- EV_COMMAND(CM_ABOUT, CmAbout),
- EV_COMMAND(CM_PENSIZE, CmPenSize),
- END_RESPONSE_TABLE;
-
- TDrawWindow::TDrawWindow(TWindow* parent)
- {
- Init(parent, 0, 0);
- DragDC = 0;
- Lines = new TLines(5, 0, 5);
- Line = new TLine;
- Pen = new TPen(TColor::Black, Line->QueryPen());
- IsNewFile = true;
- IsDirty = false;
- FileData = new TOpenSaveDialog::TData(OFN_HIDEREADONLY|OFN_FILEMUSTEXIST,
- "Point Files (*.PT8)|*.pt8|", 0, "",
- "PT8");
- }
-
- bool
- TDrawWindow::CanClose()
- {
- if (IsDirty)
- switch(MessageBox("Do you want to save?", "Drawing has changed",
- MB_YESNOCANCEL | MB_ICONQUESTION)) {
- case IDCANCEL:
- // Choosing Cancel means to abort the close -- return false.
- return false;
-
- case IDYES:
- // Choosing Yes means to save the drawing.
- CmFileSave();
- }
- return true;
- }
-
- void
- TDrawWindow::EvLButtonDown(uint, TPoint& point)
- {
- if (!DragDC) {
- SetCapture();
- DragDC = new TClientDC(*this);
- DragDC->SelectObject(*Pen);
- DragDC->MoveTo(point);
- Line->Add(point);
- IsDirty = true;
- }
- }
-
- void
- TDrawWindow::EvRButtonDown(uint, TPoint&)
- {
- SetPenSize(GetPenSize());
- }
-
- void
- TDrawWindow::EvMouseMove(uint, TPoint& point)
- {
- if (DragDC) {
- DragDC->LineTo(point);
- Line->Add(point);
- }
- }
-
- void
- TDrawWindow::EvLButtonUp(uint, TPoint&)
- {
- if (DragDC) {
- ReleaseCapture();
- Lines->Add(*Line);
- Line->Flush();
- delete DragDC;
- DragDC = 0;
- }
- }
-
- void
- TDrawWindow::CmPenSize()
- {
- SetPenSize(GetPenSize());
- }
-
- int
- TDrawWindow::GetPenSize()
- {
- char inputText[6];
- int newPenSize = 1;
-
- wsprintf(inputText, "%d", Line->QueryPen());
- if ((TInputDialog(this, "Line Thickness",
- "Input a new thickness:",
- inputText,
- sizeof(inputText))).Execute() == IDOK) {
- newPenSize = atoi(inputText);
-
- if (newPenSize < 0)
- newPenSize = 1;
- }
- return newPenSize;
- }
-
- void
- TDrawWindow::SetPenSize(int newSize)
- {
- delete Pen;
- Pen = new TPen(TColor::Black, Line->QueryPen(newSize));
- }
-
- void
- TDrawWindow::Paint(TDC& dc, bool, TRect&)
- {
- // Iterates through the array of line objects.
- TLinesIterator i(*Lines);
-
- while (i) {
- // Set pen for the dc to current line's pen.
- TPen pen(TColor::Black, i.Current().QueryPen());
- dc.SelectObject(pen);
-
- // Iterates through the points in the line i.
- TPointsIterator j(i++);
- bool first = true;
-
- while (j) {
- TPoint p = j++;
-
- if (!first)
- dc.LineTo(p);
- else {
- dc.MoveTo(p);
- first = false;
- }
- }
- dc.RestorePen();
- }
- }
-
- void
- TDrawWindow::CmFileNew()
- {
- if (CanClose()) {
- Line->Flush();
- Lines->Flush();
- Invalidate();
- IsDirty = false;
- IsNewFile = true;
- }
- }
-
- void
- TDrawWindow::CmFileOpen()
- {
- if (CanClose())
- if ((TFileOpenDialog(this, *FileData)).Execute() == IDOK)
- OpenFile();
- }
-
- void
- TDrawWindow::CmFileSave()
- {
- if (IsNewFile)
- CmFileSaveAs();
- else
- SaveFile();
- }
-
- void
- TDrawWindow::CmFileSaveAs()
- {
- if (IsNewFile)
- strcpy(FileData->FileName, "");
-
- if ((TFileSaveDialog(this, *FileData)).Execute() == IDOK)
- SaveFile();
- }
-
- void
- TDrawWindow::CmAbout()
- {
- TDialog(this, IDD_ABOUT).Execute();
- }
-
- void
- TDrawWindow::SaveFile()
- {
- ofstream os(FileData->FileName);
-
- if (!os)
- MessageBox("Unable to open file", "File Error", MB_OK | MB_ICONEXCLAMATION);
- else {
- // Write the number of lines in the figure
- os << Lines->GetItemsInContainer() << '\n';
-
- // Get an iterator for the array of lines
- TLinesIterator i(*Lines);
-
- // While the iterator is valid (i.e. we haven't run out of lines)
- while (i) {
- // Copy the current line from the iterator and increment the array.
- TLine line = i++;
- os << line;
- }
-
- // Set new file and dirty display indicator to false.
- IsNewFile = IsDirty = false;
- }
- }
-
- void
- TDrawWindow::OpenFile()
- {
- ifstream is(FileData->FileName);
-
- if (!is)
- MessageBox("Unable to open file", "File Error", MB_OK | MB_ICONEXCLAMATION);
- else {
- unsigned numLines;
-
- Lines->Flush();
- Line->Flush();
-
- is >> numLines;
-
- while (numLines--) {
- TLine line;
- is >> line;
- Lines->Add(line);
- }
- }
- IsNewFile = IsDirty = false;
- Invalidate();
- }
-
- class TDrawApp : public TApplication {
- public:
- TDrawApp() : TApplication() {}
-
- void InitMainWindow()
- {
- SetMainWindow(new TFrameWindow(0, "Drawing Pad", new TDrawWindow));
- GetMainWindow()->AssignMenu("COMMANDS");
- }
- };
-
- int
- OwlMain(int /*argc*/, char* /*argv*/ [])
- {
- return TDrawApp().Run();
- }
-
- ostream&
- operator <<(ostream& os, const TLine& line)
- {
- // Write the number of points in the line
- os << line.GetItemsInContainer();
-
- // Write the pen size
- os << ' ' << line.PenSize;
-
- // Get an iterator for the array of points
- TPointsIterator j(line);
-
- // While the iterator is valid (i.e. we haven't run out of points)
- while(j)
- // Write the point from the iterator and increment the array.
- os << j++;
-
- os << '\n';
- // return the stream object
- return os;
- }
-
- istream&
- operator >>(istream& is, TLine& line)
- {
- unsigned numPoints;
-
- is >> numPoints;
-
- is >> line.PenSize;
-
- while (numPoints--) {
- TPoint point;
- is >> point;
- line.Add(point);
- }
- // return the stream object
- return is;
- }
-
-