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TUTOROOT.PAK
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STEP08.CPP
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C/C++ Source or Header
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1995-08-29
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402 lines
//----------------------------------------------------------------------------
// 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;
}