wxWidgets-ImageView

wxWidgets实现图片浏览、放大缩小、另存为新的图片格式等

#include "wx/wxprec.h"#ifndef WX_PRECOMP#include "wx/wx.h"
#endif#include "wx/filename.h"
#include "wx/zstream.h"#include "imageviewctrl.h"class MyFrame : public wxFrame
{
public:MyFrame(wxWindow* parent,wxWindowID id,const wxString& title,const wxPoint& pos = wxDefaultPosition,const wxSize& size = wxDefaultSize,long style = wxDEFAULT_FRAME_STYLE | wxSUNKEN_BORDER,ImageViewCtrl* imageview = NULL);
private:wxString LoadUserImage(wxImage& image){wxString filename;#if wxUSE_FILEDLGfilename = wxLoadFileSelector("image", wxEmptyString);if (!filename.empty()){if (!image.LoadFile(filename)){wxLogError("Couldn't load image from '%s'.", filename);return wxEmptyString;}}
#endif // wxUSE_FILEDLGreturn filename;}void OnOpen(wxCommandEvent& WXUNUSED(event)){wxImage image;wxString filename = LoadUserImage(image);if (!filename.empty()){this->image_view_ctrl_->SetBitmap(wxBitmap(image));}this->Refresh();}void OnQuit(wxCommandEvent& WXUNUSED(event)){Close(true);}void OnAbout(wxCommandEvent& WXUNUSED(event)){wxArrayString array;array.Add("ImageView demo");array.Add(wxT("交流QQ群：747166657"));array.Add(wxT("QQ：1083969551"));array.Add(wxT("Email：[e-mail]"));array.Add(wxEmptyString);array.Add("Version of the libraries used:");#if wxUSE_LIBPNGarray.Add(wxPNGHandler::GetLibraryVersionInfo().ToString());
#endif
#if wxUSE_LIBJPEGarray.Add(wxJPEGHandler::GetLibraryVersionInfo().ToString());
#endif
#if wxUSE_LIBTIFFarray.Add(wxTIFFHandler::GetLibraryVersionInfo().ToString());
#endif
#if wxUSE_ZLIB && wxUSE_STREAMS// zlib is used by libpngarray.Add(wxGetZlibVersionInfo().ToString());
#endif(void)wxMessageBox(wxJoin(array, '\n'),"About ImageView Demo",wxICON_INFORMATION | wxOK);}void OnSave(wxCommandEvent& WXUNUSED(event)){
#if wxUSE_FILEDLGconst wxBitmap& bitmap = this->image_view_ctrl_->GetBitmap();wxImage image = bitmap.ConvertToImage();wxString savefilename = wxFileSelector( "Save Image",wxEmptyString,wxEmptyString,wxEmptyString,"BMP files (*.bmp)|*.bmp|"
#if wxUSE_LIBPNG"PNG files (*.png)|*.png|"
#endif
#if wxUSE_LIBJPEG"JPEG files (*.jpg)|*.jpg|"
#endif
#if wxUSE_GIF"GIF files (*.gif)|*.gif|"
#endif
#if wxUSE_LIBTIFF"TIFF files (*.tif)|*.tif|"
#endif
#if wxUSE_PCX"PCX files (*.pcx)|*.pcx|"
#endif
#if wxUSE_XPM"X PixMap files (*.xpm)|*.xpm|"
#endif"ICO files (*.ico)|*.ico|""CUR files (*.cur)|*.cur",wxFD_SAVE | wxFD_OVERWRITE_PROMPT,this);if ( savefilename.empty() )return;wxString extension;wxFileName::SplitPath(savefilename, NULL, NULL, &extension);bool saved = false;if ( extension == "bmp" ){static const int bppvalues[] ={wxBMP_1BPP,wxBMP_1BPP_BW,wxBMP_4BPP,wxBMP_8BPP,wxBMP_8BPP_GREY,wxBMP_8BPP_RED,
#if wxUSE_PALETTEwxBMP_8BPP_PALETTE,
#endif // wxUSE_PALETTEwxBMP_24BPP};const wxString bppchoices[] ={"1 bpp color","1 bpp B&W","4 bpp color","8 bpp color","8 bpp greyscale","8 bpp red",
#if wxUSE_PALETTE"8 bpp own palette",
#endif // wxUSE_PALETTE"24 bpp"};int bppselection = wxGetSingleChoiceIndex("Set BMP BPP","Image sample: save file",WXSIZEOF(bppchoices),bppchoices,this);if ( bppselection != -1 ){int format = bppvalues[bppselection];image.SetOption(wxIMAGE_OPTION_BMP_FORMAT, format);
#if wxUSE_PALETTEif ( format == wxBMP_8BPP_PALETTE ){unsigned char *cmap = new unsigned char [256];for ( int i = 0; i < 256; i++ )cmap[i] = (unsigned char)i;image.SetPalette(wxPalette(256, cmap, cmap, cmap));delete[] cmap;}
#endif // wxUSE_PALETTE}}
#if wxUSE_LIBPNGelse if ( extension == "png" ){static const int pngvalues[] ={wxPNG_TYPE_COLOUR,wxPNG_TYPE_COLOUR,wxPNG_TYPE_GREY,wxPNG_TYPE_GREY,wxPNG_TYPE_GREY_RED,wxPNG_TYPE_GREY_RED,};const wxString pngchoices[] ={"Colour 8bpp","Colour 16bpp","Grey 8bpp","Grey 16bpp","Grey red 8bpp","Grey red 16bpp",};int sel = wxGetSingleChoiceIndex("Set PNG format","Image sample: save file",WXSIZEOF(pngchoices),pngchoices,this);if ( sel != -1 ){image.SetOption(wxIMAGE_OPTION_PNG_FORMAT, pngvalues[sel]);image.SetOption(wxIMAGE_OPTION_PNG_BITDEPTH, sel % 2 ? 16 : 8);// these values are taken from OptiPNG with -o3 switchconst wxString compressionChoices[] ={"compression = 9, memory = 8, strategy = 0, filter = 0","compression = 9, memory = 9, strategy = 0, filter = 0","compression = 9, memory = 8, strategy = 1, filter = 0","compression = 9, memory = 9, strategy = 1, filter = 0","compression = 1, memory = 8, strategy = 2, filter = 0","compression = 1, memory = 9, strategy = 2, filter = 0","compression = 9, memory = 8, strategy = 0, filter = 5","compression = 9, memory = 9, strategy = 0, filter = 5","compression = 9, memory = 8, strategy = 1, filter = 5","compression = 9, memory = 9, strategy = 1, filter = 5","compression = 1, memory = 8, strategy = 2, filter = 5","compression = 1, memory = 9, strategy = 2, filter = 5",};sel = wxGetSingleChoiceIndex("Select compression option (Cancel to use default)\n","PNG Compression Options",WXSIZEOF(compressionChoices),compressionChoices,this);if ( sel != -1 ){const int zc[] = {9, 9, 9, 9, 1, 1, 9, 9, 9, 9, 1, 1};const int zm[] = {8, 9, 8, 9, 8, 9, 8, 9, 8, 9, 8, 9};const int zs[] = {0, 0, 1, 1, 2, 2, 0, 0, 1, 1, 2, 2};const int f[]  = {0x08, 0x08, 0x08, 0x08, 0x08, 0x08,0xF8, 0xF8, 0xF8, 0xF8, 0xF8, 0xF8};image.SetOption(wxIMAGE_OPTION_PNG_COMPRESSION_LEVEL      , zc[sel]);image.SetOption(wxIMAGE_OPTION_PNG_COMPRESSION_MEM_LEVEL  , zm[sel]);image.SetOption(wxIMAGE_OPTION_PNG_COMPRESSION_STRATEGY   , zs[sel]);image.SetOption(wxIMAGE_OPTION_PNG_FILTER                 , f[sel]);image.SetOption(wxIMAGE_OPTION_PNG_COMPRESSION_BUFFER_SIZE, 1048576); // 1 MB}}}
#endif // wxUSE_LIBPNGelse if ( extension == "cur" ){image.Rescale(32,32);image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X, 0);image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y, 0);// This shows how you can save an image with explicitly// specified image format:saved = image.SaveFile(savefilename, wxBITMAP_TYPE_CUR);}if ( !saved ){// This one guesses image format from filename extension// (it may fail if the extension is not recognized):image.SaveFile(savefilename);}
#endif // wxUSE_FILEDLG}void OnSize(wxSizeEvent& event){//event.GetSize();wxLogDebug("MyFrame OnSize");wxSize size = this->GetClientSize();wxLogDebug("MyFrame.w=%d, MyFrame.h=%d", size.x, size.y);wxLogStatus(this, "Size size: (%d, %d), ClientSize size: (%d, %d)",GetSize().x,GetSize().y,size.x,size.y);if (image_view_ctrl_){image_view_ctrl_->SetSize(10, 10, size.x-20, size.y-20);}event.Skip();}ImageViewCtrl* image_view_ctrl_;// = NULL;wxDECLARE_EVENT_TABLE();
};// ============================================================================
// implementations
// ============================================================================//-----------------------------------------------------------------------------
// MyFrame
//-----------------------------------------------------------------------------wxBEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_MENU(wxID_ABOUT, MyFrame::OnAbout)
EVT_MENU(wxID_OPEN, MyFrame::OnOpen)
EVT_MENU(wxID_EXIT, MyFrame::OnQuit)
EVT_MENU(wxID_SAVEAS, MyFrame::OnSave)
EVT_SIZE(MyFrame::OnSize)
wxEND_EVENT_TABLE()MyFrame::MyFrame(wxWindow* parent,wxWindowID id,const wxString& title,const wxPoint& pos,const wxSize& size,long style,ImageViewCtrl* imageview): wxFrame(parent, id, title, pos, size, style | wxFULL_REPAINT_ON_RESIZE), image_view_ctrl_(imageview)
{wxMenu* fileMenu = new wxMenu;fileMenu->Append(wxID_OPEN);fileMenu->Append(wxID_EXIT);fileMenu->Append(wxID_SAVEAS);wxMenu* helpMenu = new wxMenu;helpMenu->Append(wxID_ABOUT, "&About\tCtrl-O");wxMenuBar* menuBar = new wxMenuBar;menuBar->Append(fileMenu, "&File");menuBar->Append(helpMenu, "&Help");SetMenuBar(menuBar);CreateStatusBar(1);SetMinSize(wxSize(640, 480));this->SetBackgroundColour(*wxRED);wxPanel * panel = new wxPanel(this, wxID_ANY, wxPoint(0,0), GetClientSize());image_view_ctrl_ = new ImageViewCtrl(panel, wxID_ANY, wxDefaultPosition, GetClientSize());}//-----------------------------------------------------------------------------
// MyApp
//-----------------------------------------------------------------------------
// declare
class MyApp: public wxApp
{
public:virtual bool OnInit() wxOVERRIDE;
};// implement
wxIMPLEMENT_APP(MyApp);bool MyApp::OnInit()
{if ( !wxApp::OnInit() )return false;wxInitAllImageHandlers();wxFrame *frame = new MyFrame(NULL, wxID_ANY, "ImageView Demo", wxDefaultPosition, wxWindow::FromDIP(wxSize(900, 600), NULL), wxDEFAULT_FRAME_STYLE | wxSIMPLE_BORDER);frame->Show();return true;
}