请帮助我。我是C ++，C＃的菜鸟。我使用Visual Studio 2015社区，C ++ Windows窗体。 我的问题：我花了很多时间在Windows窗体上实现“另存为”，以及如何实现“另存为”。 在msdn，stackoverflow，google上搜索信息并没有帮助我。
我需要：直接在窗体（Windows窗体）上显示任何图形，线条，点，多边形，形状。多边形直接在此表格的表面上消失。我使用FillPolygon（），SolidBrush（），TexturedBrush（）。 我调整窗体的大小，并且FillPolygon（）的结果消失了。有什么方法或属性可以防止失踪吗？
如何使充满颜色的多边形不消失？我知道，最好使用pictureBox进行绘制，是否有任何方法可以将FillPolygon（），DrawLine（），DrawEllipse（）实现到pictureBox中？如果有，该如何实施？
我画了些东西，想用“另存为”保存最近的更改，但是最后的更改没有保存。如何使用“另存为”保存最近的更改？只需另存为。我将pictureBox的OverWritePrompt设置为true。
最好直接在pictureBox中绘制图片而不使用.jpeg，gif，tiff图像吗？
我创建了一个ShowDialog（）。如何创建查看已保存的最后一步的功能？
表单中任何位置的任何图像的任何更改都应另存为。我不是要编写CorelDraw，Photoshop，而是要编写另存为的代码。我需要了解确切的算法，获取另存为方法的代码。
我在哪里可以看到“取消最后一步”功能（撤消Ctrl + Z）？
获取带有C ++注释的代码会更好。我也会尝试理解С＃中的代码。请详细介绍经验丰富的程序员，而不是像往常一样简短地向初学者讲解。我很高兴收到确切网址的链接。
我的代码：
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
using namespace System::Drawing::Drawing2D;
using namespace System::Drawing::Imaging;
using namespace System::IO;
public ref class Creat : public System::Windows::Forms::Form
{
private:
Bitmap ^nak; // variable Bitmap image
PictureBox^ pictureBox4;
public:
void SaveAs(String^ filename) // Save As method
{
throw gcnew System::NotImplementedException();
}
// constructor
Creat(void)
{
InitializeComponent();
//TODO: Add the constructor code here
// setting the openDialog1 component
openFileDialog1->AddExtension = true;
openFileDialog1->Filter = "Image Files(*.bmp)|*.bmp|Image Files(*.JPG)|*.JPG|Image Files(*.jpeg)|*.jpeg|Image Files(*.GIF)|*.GIF|Image Files(*.emf)|*.emf|Image Files(*.ico)|*.ico|Image Files(*.png)|*.png|Image Files(*tif)|*.tif|Image Files(*.wmf)|*.wmf|Image Files(*.exif)|*.exif|All files(*.*)|*.*";
openFileDialog1->FilterIndex = 2;
openFileDialog1->DefaultExt = "jpg";
openFileDialog1->Title = "Open Document";
openFileDialog1->Multiselect = false;
openFileDialog1->CheckFileExists = true;
// setting the saveFileDialog1 component
saveFileDialog1->AddExtension = true;
saveFileDialog1->Filter = "Image Files(*.bmp)|*.bmp|Image Files(*.JPG)|*.JPG|Image Files(*.jpeg)|*.jpeg|Image Files(*.GIF)|*.GIF|Image Files(*.emf)|*.emf|Image Files(*.ico)|*.ico|Image Files(*.png)|*.png|Image Files(*.tif)|*.tif|Image Files(*.wmf)|*.wmf|Image Files(*.exif)|*.exif|All files(*.*)|*.*";
saveFileDialog1->FilterIndex = 2;
saveFileDialog1->DefaultExt = "jpg";
saveFileDialog1->Title = "Save Document";
saveFileDialog1->CheckFileExists = true;
fn = String::Empty; // fn- file name
imageChanged = false;
}
protected:
/// Clean up any resources being used.
/// </summary>
~Creat()
{
if (components)
{
delete components;
}
}
private: System::Windows::Forms::Button^ button1;
private: System::Windows::Forms::PictureBox^ pictureBox1;
...
private: System::Windows::Forms::SaveFileDialog^ saveFileDialog1;
...
private: System::Windows::Forms::OpenFileDialog^ openFileDialog1;
private:
/// Required designer variable.
System::ComponentModel::Container ^components;
#pragma region Windows Form Designer generated code
/// Required method for Designer support - do not modify
void InitializeComponent(void)
{
...
// saveFileDialog1
this->saveFileDialog1->Filter = resources->GetString(L"saveFileDialog1.Filter");
// openFileDialog1
this->openFileDialog1->FileName = L"openFileDialog1";
this->openFileDialog1->Filter = resources->GetString(L"openFileDialog1.Filter");
...
}
#pragma endregion
String^ fn; // fn - file name
bool imageChanged; // true - if I made changes to the image
// The image has changed in PictureBox'e 'or in the Form
private: System::Void pictureBox1_BackgroundImageChanged(System::Object^ sender, System::EventArgs^ e)
{
imageChanged = true;
}
// Writes an image to a file.
//Returns 0 or -1 if the user in the Save window clicks Cancel
private: int ImageToFile()
{
System::Windows::Forms::DialogResult dr;
int r = 0;
if (fn == String::Empty)
{
// this is a new document, ask the user for the file name.
// display the Save dialog
dr = saveFileDialog1->ShowDialog();
if (dr == System::Windows::Forms::DialogResult::OK)
{
fn = saveFileDialog1->FileName;
r = 0;
}
else
r = -1; // user did not save. click on the Cancel
//button
}
// save file
if (r == 0)
{
try
{
// get information about the file fn
System::IO::FileInfo^ fi = gcnew System::IO::FileInfo(fn);
System::IO::FileStream^ fs = safe_cast<System::IO::FileStream^>(saveFileDialog1->OpenFile());
// stream for writing
System::IO::StreamWriter^ sw = fi->CreateText();
sw->Write(pictureBox1->Image);
sw->Close(); // close the stream
imageChanged = false;
r = 0;
}
catch (System::IO::IOException^ e)
{
MessageBox::Show(e->ToString(), "BeautifulLady", MessageBoxButtons::OK, MessageBoxIcon::Information);
}
}
return r;
}
// Check if there are any changes to the Image and save the Image
//in the file.
// Returns: 0 or -1 if the user declines to save (click Cancel)
private: int SaveImg()
{
System::Windows::Forms::DialogResult dr;
int r;
r = 0;
if (imageChanged) // The image has been changed. Do you want to
// save it?
{
dr = MessageBox::Show("The image has been changed. Do you want to save it?", "BeautifulLady", MessageBoxButtons::YesNoCancel, MessageBoxIcon::Warning);
switch (dr)
{
case System::Windows::Forms::DialogResult::Yes:
r = ImageToFile();
break;
case System::Windows::Forms::DialogResult::No:
r = 0;
break;
case System::Windows::Forms::DialogResult::Cancel:
r = -1;
break;
}
}
return r;
}
// Open document
private: void OpenDocument()
{
System::Windows::Forms::DialogResult dr;
int r;
r = SaveImg();
if (r == 0)
{
openFileDialog1->FileName = String::Empty;
// showing the Open window
dr = openFileDialog1->ShowDialog();
if (dr == System::Windows::Forms::DialogResult::OK)
{
fn = openFileDialog1->FileName;
// show file name in the title of the window
this->Text = fn;
// large object (Blob) - image file
String^ sBlobFile = "C:\\Users\\Igor\\Pictures\\model.jpg";
try
{
// I read data from a file
System::IO::StreamReader^ sr = gcnew System::IO::StreamReader(fn);
FileStream^ fsBlobData = gcnew FileStream(sBlobFile, System::IO::FileMode::Open, System::IO::FileAccess::Read);
System::IO::FileStream^ fs = gcnew System::IO::FileStream(fn, System::IO::FileMode::Open);
Byte *bytBlobdata = new Byte[fsBlobData->Length];
// fsBlobData->Read(bytBlobdata, 0, bytBlobdata->Length);
// sBlobFile->Read(bytBlobdata, 0, bytBlobdata->Length);
// fsBlobData.Close();
// MemoryStream stmBlobData = new MemoryStream(bytBlobData);
// FileStream dumpFile = new FileStream("C:\Dump.jpg",
// FileMode.Create, FileAccess.ReadWrite);
// stmBlobData.WriteTo(dumpFile);
// stmBlobData.Close();
// pictureBox1->Image = fs->BeginRead();
fs->Close();
File::Delete(sBlobFile);
FileStream^ dumpFile = gcnew
FileStream("C:\\Users\\Igor\\Pictures\\Dump.jpg",
System::IO::FileMode::Create, System::IO::FileAccess::ReadWrite);
// System::IO::BinaryReader^ br = gcnew System::IO::BinaryReader(fn);
Image^ img = Image::FromStream(fs);
// Bitmap^ bmp = Image::FromStream(fs);
// pictureBox1->Text = sr->ReadToEnd();
// pictureBox1->SelectionStart = pictureBox1->TextLength;
img->Save(fn, System::Drawing::Imaging::ImageFormat::Jpeg);
imageChanged = false;
}
catch (System::IO::FileLoadException^ e)
{
MessageBox::Show("Error of reading the image file\n" + e->Message, "BeautifulLady", MessageBoxButtons::OK,
MessageBoxIcon::Error);
}
}
}
}
// Save the document
private: void SaveDocument()
{
System::Windows::Forms::DialogResult dr;
int r;
r = SaveImg();
if (r == 0)
{
this->Text = fn;
imageChanged = false;
// show Save dialog
dr = saveFileDialog1->ShowDialog();
}
}
// create a document
private: void NewDocument()
{
int r;
r = SaveImg();
if (r == 0)
{
this->Text = "New Image";
// to paint over the previous one
Color ^col = gcnew Color();
Graphics ^im = this->CreateGraphics();
im->Clear(col->White);
imageChanged = false;
fn = String::Empty;
}
}
// User attempts to close the program window
private: System::Void Creat_FormClosing(System::Object^ sender, System::Windows::Forms::FormClosingEventArgs^ e)
{
int r;
r = SaveImg();
if (r != 0)
{
e->Cancel = true;
}
}
// function to save the polygon
private: void Save_Restore(PaintEventArgs^ e)
{
Graphics^ og = this->CreateGraphics();
// I create a polygon
SolidBrush ^sb = gcnew SolidBrush(Color::Blue);
Point pa1 = Point(850, 200);
Point pa2 = Point(900, 250);
Point pa3 = Point(930, 270);
Point pa4 = Point(950, 280);
Point pa5 = Point(850, 200);
array<Point>^ pP = { pa1,pa2,pa3,pa4,pa5, };
og->FillPolygon(sb, pP);
// I save the polygon
SaveImg();
SaveDocument();
GraphicsState^ creaPolState = e->Graphics->Save();
}
// Save (click the Save button)
private: System::Void button16_Click(System::Object^ sender, System::EventArgs^ e)
{
saveFileDialog1->ShowDialog();
Bitmap^ bitmap = gcnew Bitmap(Convert::ToInt32(1024), Convert::ToInt32(1024), System::Drawing::Imaging::PixelFormat::Format32bppArgb);
Graphics^ g = Graphics::FromImage(bitmap);
g = this->CreateGraphics();
// I create a polygon
SolidBrush ^sb = gcnew SolidBrush(Color::Blue);
Point pa1 = Point(150, 200);
Point pa2 = Point(200, 250);
Point pa3 = Point(230, 270);
Point pa4 = Point(150, 200);
array<Point>^ pP = { pa1,pa2,pa3,pa4 };
g->FillPolygon(sb, pP);
g->DrawImage(bitmap, (sb, (pa1, pa2, pa3, pa4)));
bitmap->Save("C:\\Users\\Igor\\Pictures\\savepol.jpg", System::Drawing::Imaging::ImageFormat::Jpeg);
SaveImg();
SaveDocument();
private: String^ full_name_of_image; // full pathname + name
private: Bitmap^ bitmap_for_draw; // bitmap for drawing
// button to display the image in pictureBox1
private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e)
{
// Get image
nak = gcnew Bitmap(Application::StartupPath + "\\model.jpg", true);
pictureBox1->Image = nak; // PictureBox to display the image
// "Open" dialog box
OpenFileDialog^ opf = gcnew OpenFileDialog();
opf->Filter = "Image Files(*.BMP)|*.BMP|Image Files(*.JPG)|*.JPG|Image Files(*.GIF)|*.GIF|Image Files(*.PNG)|*.PNG|All files(*.*)|*.*";
if (opf->ShowDialog() == System::Windows::Forms::DialogResult::Yes)
{
try
{
full_name_of_image = opf->FileName;
bitmap_for_draw = gcnew Bitmap(opf->FileName);
this->pictureBox1->SizeMode = PictureBoxSizeMode::CenterImage;
bitmap_for_draw = nak;
pictureBox1->Image = bitmap_for_draw;
pictureBox1->Invalidate();
}
catch (IOException^)
{
System::Windows::Forms::DialogResult^ result;
result = MessageBox::Show("Impossible to open selected file\n," + "probably the file does not exists.", "Beautiful Lady", MessageBoxButtons::OK, MessageBoxIcon::Information);
}
}
}
// Drawing on model in pictureBox1
bool Draw; // drawing variable in pictureBox1
private: System::Void button19_Click(System::Object^ sender, System::EventArgs^ e)
{
Graphics^ g = pictureBox1->CreateGraphics();
}
// User moves the mouse and draws on the model
private: System::Void pictureBox1_MouseMove(System::Object^ sender, System::Windows::Forms::MouseEventArgs^ e)
{
Graphics^ gr = pictureBox1->CreateGraphics();
SolidBrush ^sb = gcnew SolidBrush(Color::AliceBlue);
if (Draw)
{
gr->FillRectangle(sb, e->X, e->Y, 1, 1); // brush thickness
// filling with rectangles
}
}
// User pressed the mouse button
private: System::Void pictureBox1_MouseDown(System::Object^ sender, System::Windows::Forms::MouseEventArgs^ e)
{
Draw = true;
}
// User let go of the mouse
private: System::Void pictureBox1_MouseUp(System::Object^ sender, System::Windows::Forms::MouseEventArgs^ e)
{
Draw = false;
}
// to use the Save method.'Save Model' button
private: System::Void button15_Click(System::Object^ sender, System::EventArgs^ e)
{
Bitmap ^myImage = gcnew
Bitmap("C:\\Users\\Igor\\Pictures\\orgn.jpg");
if (pictureBox1->Image != nullptr)
{
full_name_of_image = "C:\\Users\\Igor\\Pictures\\orgn1.jpg";
String^ format = full_name_of_image->Substring(full_name_of_image->Length - 5, 4);
SaveFileDialog^ sd = gcnew SaveFileDialog();
sd->Title = "Save image As";
sd->CheckPathExists = true;
sd->CheckFileExists = true;
sd->AddExtension = true;
sd->Filter = "Image Files(*.BMP)|*.BMP|Image Files(*.JPG)|*.JPG|Image Files(*.GIF)|*.GIF|Image Files(*.PNG)|*.PNG|All files(*.*)|*.*";
sd->FilterIndex = 2;
sd->DefaultExt = "jpg";
sd->OverwritePrompt = true;
sd->ShowHelp = true;
// if user choses to save
if (sd->ShowDialog() == System::Windows::Forms::DialogResult::Yes)
{
this->saveFileDialog1->ShowDialog();
fn = saveFileDialog1->FileName;
SaveImg();
SaveDocument();
try
{
//sd->FileName = "C:\\Users\\Igor\\Pictures\\orgn1.jpg";
myImage->Save(sd->FileName, System::Drawing::Imaging::ImageFormat::Jpeg);
}
catch(IOException^)
{
MessageBox::Show("Impossible to save this image", "Beautiful Lady", MessageBoxButtons::OK, MessageBoxIcon::Information);
}
pictureBox1->Image->Save(sd->FileName, System::Drawing::Imaging::ImageFormat::Jpeg);
}
}
}
// draws the model
private: System::Void Creat_Paint(System::Object^ sender, System::Windows::Forms::PaintEventArgs^ e)
{
// for not to write e->Graphics every time
System::Drawing::Graphics ^g = e->Graphics;
// I draw a model at 508 horizontally, 184 vertically
Graphics ^nak = this->CreateGraphics();
}
// The SizeChanged event occurs when the form size is changed
private: System::Void Creat_SizeChanged(System::Object^ sender, System::EventArgs^ e)
{
// The Refresh method: the form needs to be redrawn
this->Refresh(); // update form
}