运行效果：
源代码：
/***************************************************************
* Name: wxMyPainterApp.h
* Purpose: Defines Application Class
* Author: yanzhenxi ([email protected])
* Created: 2023-12-21
* Copyright: yanzhenxi ()
* License:
**************************************************************/
#ifndef WXMYPAINTERAPP_H
#define WXMYPAINTERAPP_H
#include
class wxMyPainterApp : public wxApp
{
public:
virtual bool OnInit();
};
#endif // WXMYPAINTERAPP_H
/***************************************************************
* Name: wxMyPainterApp.cpp
* Purpose: Code for Application Class
* Author: yanzhenxi ([email protected])
* Created: 2023-12-21
* Copyright: yanzhenxi ()
* License:
**************************************************************/
#include "wxMyPainterApp.h"
//(*AppHeaders
#include "wxMyPainterMain.h"
#include
//*)
IMPLEMENT_APP(wxMyPainterApp);
bool wxMyPainterApp::OnInit()
{
//(*AppInitialize
bool wxsOK = true;
wxInitAllImageHandlers();
if ( wxsOK )
{
wxMyPainterFrame* Frame = new wxMyPainterFrame(0);
Frame->Show();
SetTopWindow(Frame);
}
//*)
return wxsOK;
}
/***************************************************************
* Name: wxMyPainterMain.h
* Purpose: Defines Application Frame
* Author: yanzhenxi ([email protected])
* Created: 2023-12-21
* Copyright: yanzhenxi ()
* License:
**************************************************************/
#ifndef WXMYPAINTERMAIN_H
#define WXMYPAINTERMAIN_H
//(*Headers(wxMyPainterFrame)
#include
#include
#include
#include
#include
#include
//*)
class wxMyPainterFrame: public wxFrame
{
public:
wxMyPainterFrame(wxWindow* parent,wxWindowID id = -1);
virtual ~wxMyPainterFrame();
private:
//(*Handlers(wxMyPainterFrame)
void OnQuit(wxCommandEvent& event);
void OnAbout(wxCommandEvent& event);
void OnScrolledWindow1LeftDown(wxMouseEvent& event);
void OnScrolledWindow1MouseMove(wxMouseEvent& event);
void OnScrolledWindow1LeftUp(wxMouseEvent& event);
void OnScrolledWindow1Paint(wxPaintEvent& event);
//*)
//(*Identifiers(wxMyPainterFrame)
static const long ID_LISTBOX1;
static const long ID_SCROLLEDWINDOW1;
static const long idMenuQuit;
static const long idMenuAbout;
static const long ID_STATUSBAR1;
//*)
//(*Declarations(wxMyPainterFrame)
wxScrolledWindow* ScrolledWindow1;
wxStatusBar* StatusBar1;
wxListBox* ListBox1;
//*)
private:
bool _drawing; //绘图状态：真则表示正在绘图
wxPoint _startPositionLogical, _currentPositionLogical; //正在画的图形的开始位置和最新位置
DECLARE_EVENT_TABLE()
};
#endif // WXMYPAINTERMAIN_H
/***************************************************************
* Name: wxMyPainterMain.cpp
* Purpose: Code for Application Frame
* Author: yanzhenxi ([email protected])
* Created: 2023-12-21
* Copyright: yanzhenxi ()
* License:
**************************************************************/
#include "wxMyPainterMain.h"
#include
#include
//(*InternalHeaders(wxMyPainterFrame)
#include
#include
#include
//*)
//helper functions
enum wxbuildinfoformat {
short_f, long_f };
wxString wxbuildinfo(wxbuildinfoformat format)
{
wxString wxbuild(wxVERSION_STRING);
if (format == long_f )
{
#if defined(__WXMSW__)
wxbuild << _T("-Windows");
#elif defined(__UNIX__)
wxbuild << _T("-Linux");
#endif
#if wxUSE_UNICODE
wxbuild << _T("-Unicode build");
#else
wxbuild << _T("-ANSI build");
#endif // wxUSE_UNICODE
}
return wxbuild;
}
//(*IdInit(wxMyPainterFrame)
const long wxMyPainterFrame::ID_LISTBOX1 = wxNewId();
const long wxMyPainterFrame::ID_SCROLLEDWINDOW1 = wxNewId();
const long wxMyPainterFrame::idMenuQuit = wxNewId();
const long wxMyPainterFrame::idMenuAbout = wxNewId();
const long wxMyPainterFrame::ID_STATUSBAR1 = wxNewId();
//*)
BEGIN_EVENT_TABLE(wxMyPainterFrame,wxFrame)
//(*EventTable(wxMyPainterFrame)
//*)
END_EVENT_TABLE()
wxMyPainterFrame::wxMyPainterFrame(wxWindow* parent,wxWindowID id)
: _drawing(false), _startPositionLogical(0, 0), _currentPositionLogical(0, 0)
{
//(*Initialize(wxMyPainterFrame)
wxMenuItem* MenuItem2;
wxMenuItem* MenuItem1;
wxMenu* Menu1;
wxBoxSizer* BoxSizer1;
wxMenuBar* MenuBar1;
wxMenu* Menu2;
Create(parent, id, wxEmptyString, wxDefaultPosition, wxDefaultSize, wxDEFAULT_FRAME_STYLE, _T("id"));
SetClientSize(wxSize(208,94));
BoxSizer1 = new wxBoxSizer(wxHORIZONTAL);
ListBox1 = new wxListBox(this, ID_LISTBOX1, wxDefaultPosition, wxSize(168,68), 0, 0, 0, wxDefaultValidator, _T("ID_LISTBOX1"));
BoxSizer1->Add(ListBox1, 0, wxALL|wxEXPAND, 5);
ScrolledWindow1 = new wxScrolledWindow(this, ID_SCROLLEDWINDOW1, wxDefaultPosition, wxDefaultSize, wxVSCROLL|wxHSCROLL, _T("ID_SCROLLEDWINDOW1"));
ScrolledWindow1->SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
BoxSizer1->Add(ScrolledWindow1, 1, wxALL|wxEXPAND, 5);
SetSizer(BoxSizer1);
MenuBar1 = new wxMenuBar();
Menu1 = new wxMenu();
MenuItem1 = new wxMenuItem(Menu1, idMenuQuit, _("Quit\tAlt-F4"), _("Quit the application"), wxITEM_NORMAL);
Menu1->Append(MenuItem1);
MenuBar1->Append(Menu1, _("&File"));
Menu2 = new wxMenu();
MenuItem2 = new wxMenuItem(Menu2, idMenuAbout, _("About\tF1"), _("Show info about this application"), wxITEM_NORMAL);
Menu2->Append(MenuItem2);
MenuBar1->Append(Menu2, _("Help"));
SetMenuBar(MenuBar1);
StatusBar1 = new wxStatusBar(this, ID_STATUSBAR1, 0, _T("ID_STATUSBAR1"));
int __wxStatusBarWidths_1[1] = { -1 };
int __wxStatusBarStyles_1[1] = { wxSB_NORMAL };
StatusBar1->SetFieldsCount(1,__wxStatusBarWidths_1);
StatusBar1->SetStatusStyles(1,__wxStatusBarStyles_1);
SetStatusBar(StatusBar1);
SetSizer(BoxSizer1);
Layout();
ScrolledWindow1->Connect(wxEVT_PAINT,(wxObjectEventFunction)&wxMyPainterFrame::OnScrolledWindow1Paint,0,this);
ScrolledWindow1->Connect(wxEVT_LEFT_DOWN,(wxObjectEventFunction)&wxMyPainterFrame::OnScrolledWindow1LeftDown,0,this);
ScrolledWindow1->Connect(wxEVT_LEFT_UP,(wxObjectEventFunction)&wxMyPainterFrame::OnScrolledWindow1LeftUp,0,this);
ScrolledWindow1->Connect(wxEVT_MOTION,(wxObjectEventFunction)&wxMyPainterFrame::OnScrolledWindow1MouseMove,0,this);
Connect(idMenuQuit,wxEVT_COMMAND_MENU_SELECTED,(wxObjectEventFunction)&wxMyPainterFrame::OnQuit);
Connect(idMenuAbout,wxEVT_COMMAND_MENU_SELECTED,(wxObjectEventFunction)&wxMyPainterFrame::OnAbout);
//*)
//设置滚动选项
ScrolledWindow1->SetScrollRate(10, 10);
ScrolledWindow1->SetVirtualSize(500, 480);
}
wxMyPainterFrame::~wxMyPainterFrame()
{
//(*Destroy(wxMyPainterFrame)
//*)
}
void wxMyPainterFrame::OnQuit(wxCommandEvent& event)
{
Close();
}
void wxMyPainterFrame::OnAbout(wxCommandEvent& event)
{
wxString msg = wxbuildinfo(long_f);
wxMessageBox(msg, _("Welcome to..."));
}
void wxMyPainterFrame::OnScrolledWindow1LeftDown(wxMouseEvent& event)
{
/*若为真，表示此时正处于绘画转态，也就没有必要设置_drawing
和取画图的其实点了，这种情况对应着，在画图中，按着左键拖动过程中*/
if(_drawing)
{
return;
}
_drawing = true;
_startPositionLogical = ScrolledWindow1->CalcUnscrolledPosition(event.GetPosition());
}
void wxMyPainterFrame::OnScrolledWindow1MouseMove(wxMouseEvent& event)
{
if(!_drawing)//不在绘画状态？
{
return;//直接退出
}
_currentPositionLogical = ScrolledWindow1->CalcUnscrolledPosition(event.GetPosition());
ScrolledWindow1->Refresh();
}
void wxMyPainterFrame::OnScrolledWindow1LeftUp(wxMouseEvent& event)
{
if(!_drawing)//不在绘画状态？
{
return; //直接推出
}
_currentPositionLogical = ScrolledWindow1->CalcUnscrolledPosition(event.GetPosition());
ScrolledWindow1->Refresh();
_drawing = false; //结束绘画状态
}
void wxMyPainterFrame::OnScrolledWindow1Paint(wxPaintEvent& event)
{
wxPaintDC dc(ScrolledWindow1);
wxPoint startPosition = ScrolledWindow1->CalcScrolledPosition(_startPositionLogical);
wxPoint endPosition = ScrolledWindow1->CalcScrolledPosition(_currentPositionLogical);
dc.DrawLine(startPosition, endPosition);
}
关键代码：
窗口增加私有成员数据并初始化
wxMyPainterFrame构造函数中，设置滚动选项
增加鼠标按下，移动，抬起函数
实现画图函数
