form1.h

我的新光盘里的"如何绘制汽车速度计的设计"有点用吧

#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;
	using namespace System::Drawing::Drawing2D;

	/// <summary> 
	/// Form1 摘要
	///
	/// 警告: 如果您更改该类的名称，则需要更改 
	///          与该类所依赖的所有 .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关联的
	///          本地化资源正确交互。
	/// </summary>
	public __gc class Form1 : public System::Windows::Forms::Form
	{	
	public:
		Form1(void)
		{
			InitializeComponent();
		}
  
	protected:
		void Dispose(Boolean disposing)
		{
			if (disposing && components)
			{
				components->Dispose();
			}
			__super::Dispose(disposing);
		}
	private: System::Windows::Forms::Panel *  panel1;

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

		/// <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 = new 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 = S"panel1";
			this->panel1->Size = System::Drawing::Size(344, 246);
			this->panel1->TabIndex = 0;
			// 
			// Form1
			// 
			this->AutoScaleBaseSize = System::Drawing::Size(6, 14);
			this->ClientSize = System::Drawing::Size(344, 246);
			this->Controls->Add(this->panel1);
			this->MaximizeBox = false;
			this->Name = S"Form1";
			this->StartPosition = System::Windows::Forms::FormStartPosition::CenterScreen;
			this->Text = S"演示绘制汽车速度计";
			this->Paint += new System::Windows::Forms::PaintEventHandler(this, Form1_Paint);
			this->ResumeLayout(false);

		}	
	private: System::Void Form1_Paint(System::Object *  sender, System::Windows::Forms::PaintEventArgs *  e)
			 {//绘制汽车速度计
				 Graphics* g=this->panel1->CreateGraphics();
				 Rectangle MyClientRect=Rectangle(0,0,this->panel1->get_Width(),this->panel1->get_Height());                 
				//设置速度计的高和宽
				 float MyWidth=this->panel1->get_Width();
				 float MyHeight =this->panel1->get_Height();	
	 		    //设置文本输出外观
				 g->set_SmoothingMode(SmoothingMode::AntiAlias);
				FontFamily*  MyFamily=new FontFamily("Times New Roman");
				System::Drawing::Font*   MyFont=new System::Drawing::Font(MyFamily, 14, FontStyle::Bold, GraphicsUnit::Pixel);
				//将绘图平面的坐标原点移到窗口中心
				g->TranslateTransform(MyWidth/2,MyHeight/2);
				//绘制速度计仪表盘
				g->FillEllipse(Brushes::Black,MyHeight/-2,MyHeight/-2,MyHeight, MyHeight);
				g->DrawString("公里/小时",MyFont,Brushes::Green,PointF(-26,MyHeight/3-MyFont->get_Height()));
				g->RotateTransform(225);
				//绘制刻度标记				
				for(int x = 0; x<55;x++)
				{
					g->FillRectangle(Brushes::Green,Rectangle(-2,(MyHeight/2 -2)* -1,3,15));
					g->RotateTransform(5);
				}
				//重置绘图平面的坐标变换
				g->ResetTransform();
				g->TranslateTransform(MyWidth/2,MyHeight/2);
				g->RotateTransform(225);
				int iSpeed = 0;
				//绘制刻度值(整数类)
				for(int x = 0; x<7;x++)
				{
					String* MyTemp=iSpeed.ToString();
					//绘制红色刻度
					g->FillRectangle(Brushes::Red,Rectangle(-3,(MyHeight/2 -2)* -1,6,25));
					//绘制数值
					g->DrawString(MyTemp,MyFont,Brushes::Green,PointF(MyTemp->get_Length()*(-6),(MyHeight/-2) + 25));
					//旋转45度
					g->RotateTransform(45);
					iSpeed += 20;
				}
				//重置绘图平面的坐标变换
				g->ResetTransform();
				g->TranslateTransform(MyWidth /2,MyHeight/2);
				//绘制指针在30公里/秒的情形
				float angle= 30*2.25f+ 225;
				g->RotateTransform((float)angle);
				Pen* MyPen=new Pen(Color::Blue,14);
				//设置线帽
				MyPen->set_EndCap(LineCap::ArrowAnchor);
				MyPen->set_StartCap(LineCap::RoundAnchor);
				//画指针
				g->DrawLine(MyPen,PointF(0,0),PointF(0,(-1)*(MyHeight/2.75F)));
				g->ResetTransform();
				g->TranslateTransform(MyWidth/2,MyHeight/2);
				//绘制中心点
				g->FillEllipse(Brushes::Black,-6,-9,14,14);
				g->FillEllipse(Brushes::Red,-7,-7,14,14);
				//绘制速度极限标记
				MyPen->set_Width(4);
				MyPen->set_Color(Color::Black);
				MyPen->set_EndCap(LineCap::Round);
				MyPen->set_StartCap(LineCap::Flat);
				g->DrawLine(MyPen,PointF(MyHeight/15.75F,MyHeight/3.95F),
				 PointF(MyHeight/10.75F,MyHeight/5.2F));
				MyPen->set_Color(Color::Red);
				g->DrawLine(MyPen,PointF(MyHeight/15.75F,MyHeight/3.95F),
				  PointF(MyHeight/15.75F,MyHeight/4.6F));
			 }

	};
}