form1.h

《VC++2005编程实例》第二章的源代码

#pragma once


namespace Example {

	using namespace System;
	using namespace System::ComponentModel;
	using namespace System::Collections;
	using namespace System::Windows::Forms;
	using namespace System::Data;
	using namespace System::Drawing;

	/// <summary>
	/// Form1 摘要
	///
	/// 警告: 如果更改此类的名称，则需要更改
	///          与此类所依赖的所有 .resx 文件关联的托管资源编译器工具的
	///          “资源文件名”属性。否则，
	///          设计器将不能与此窗体的关联
	///          本地化资源正确交互。
	/// </summary>
	public ref class Form1 : public System::Windows::Forms::Form
	{
	public:
		Form1(void)
		{
			InitializeComponent();
			//
			//TODO: 在此处添加构造函数代码
			//
		}

	protected:
		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		~Form1()
		{
			if (components)
			{
				delete components;
			}
		}
	private: System::Windows::Forms::Panel^  panel1;
	protected: 

	private:
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
		/// <summary>
		/// 设计器支持所需的方法 - 不要
		/// 使用代码编辑器修改此方法的内容。
		/// </summary>
		void InitializeComponent(void)
		{
			this->panel1 = (gcnew System::Windows::Forms::Panel());
			this->SuspendLayout();
			// 
			// panel1
			// 
			this->panel1->Dock = System::Windows::Forms::DockStyle::Fill;
			this->panel1->Location = System::Drawing::Point(0, 0);
			this->panel1->Name = L"panel1";
			this->panel1->Size = System::Drawing::Size(390, 214);
			this->panel1->TabIndex = 0;
			this->panel1->Paint += gcnew System::Windows::Forms::PaintEventHandler(this, &Form1::panel1_Paint);
			// 
			// Form1
			// 
			this->AutoScaleDimensions = System::Drawing::SizeF(6, 12);
			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
			this->ClientSize = System::Drawing::Size(390, 214);
			this->Controls->Add(this->panel1);
			this->Name = L"Form1";
			this->StartPosition = System::Windows::Forms::FormStartPosition::CenterScreen;
			this->Text = L"演示使用方向键浏览大图像";
			this->KeyDown += gcnew System::Windows::Forms::KeyEventHandler(this, &Form1::Form1_KeyDown);
			this->Load += gcnew System::EventHandler(this, &Form1::Form1_Load);
			this->ResumeLayout(false);

		}
#pragma endregion
	public: Graphics^ MyGraphics,^MyBmpGraphics;
	public: Bitmap^ MyBmp;
	public: int MyXPos,MyYPos;
//绘制图像
	private: System::Void panel1_Paint(System::Object^  sender, System::Windows::Forms::PaintEventArgs^  e) {
	 if(this->MyBmp!=nullptr)
      this->MyGraphics->DrawImage(MyBmp,MyXPos,MyYPos);
			 }
 //装入图像
	private: System::Void Form1_Load(System::Object^  sender, System::EventArgs^  e) {
				 this->MyBmp=(Bitmap^)Image::FromFile(Application::StartupPath+"\\MyBitmap.jpg");
	this->MyBmpGraphics=Graphics::FromImage(MyBmp);
    this->MyGraphics=this->panel1->CreateGraphics();
    this->MyXPos=0;
    this->MyYPos=0;
    this->panel1->Focus();
			 }
 //通过方向键浏览图像
	private: System::Void Form1_KeyDown(System::Object^  sender, System::Windows::Forms::KeyEventArgs^  e) {
  if (this->MyBmp == nullptr)
       return;
   switch(e->KeyValue)
   {
      case 37://LEFT ARROW（左箭头）键
         if( MyXPos<0)
             MyXPos=MyXPos+10;
         break;
      case 38://UP ARROW（上箭头）键
         if(MyYPos<0)
             MyYPos=MyYPos+10;
         break;
      case 39://RIGHT ARROW（右箭头）键
         if(MyXPos>(-(MyBmp->Width-panel1->Width)))
             MyXPos=MyXPos-10;
         break;
      case 40://DOWN ARROW（下箭头）键
         if(MyYPos>(-(MyBmp->Height-panel1->Height)))
             MyYPos=MyYPos-10;
         break;
   }
  this->panel1->Refresh();

			 }
	};
}