C#基础绘图

/*
 * Created by SharpDevelop.
 * User: Jason_PC
 * Date: 2018/5/6
 * Time: 20:48
 * 
 * To change this template use Tools | Options | Coding | Edit Standard Headers.
 */
using System;
using System.Drawing;
using System.Windows.Forms;
using System.Drawing.Drawing2D;


namespace Windows
{
    /// <summary>
    /// Description of MainForm.
    /// </summary>
    public partial class MainForm : Form
    {
        //Graphics g;
        public MainForm()
        {
            //
            // The InitializeComponent() call is required for Windows Forms designer support.
            //
            InitializeComponent();
            //
            // TODO: Add constructor code after the InitializeComponent() call.
            //
        }
        
        void Form1_Paint(PaintEventArgs e)
        {            
            //g= e.Graphics;
            //清除整个绘图面并以指定背景色填充
            //g.Clear(Color.White);
            //随便绘制一条直线出来看看
            //g.DrawLine(SystemPens.ControlText, 10, 10, 100, 100);
        }
        
        void MainFormLoad(object sender, EventArgs e)
        {
    
        }
        
        void BtnDrawLine_Click(object sender, EventArgs e)
        { 
            Graphics g = this.CreateGraphics();
            Color red = Color.FromArgb(255, 0, 0);
            Pen blackPen = new Pen(red, 3);
            Point point1 = new Point(100, 100); //坐标（100，100）
            Point point2 = new Point(500, 100); //坐标（500，100）
            g.DrawLine(blackPen, point1, point2); //两个坐标连成直线
    
        }
        void BtnInvalidate_Click(object sender, EventArgs e)
        {
    
            Rectangle r = new Rectangle(10, 10, 200, 400); //从坐标（10，10）开始，定义一个宽度200，高度200的矩形区域
            this.Invalidate(r);
        }
        void BtnDrawPie_Click(object sender, EventArgs e)
        { 
            Graphics g = this.CreateGraphics();
            Rectangle r = new Rectangle(10, 10, 200, 100);
            Pen pen1 = new Pen(Color.Black);
            g.DrawRectangle(pen1, 50, 50, 200, 200);  //起始坐标（50，50），宽度200，高度200
            //椭圆
            g.DrawPie(pen1, 50, 50, 200, 300, 225, 10);  //起始坐标（50，50），宽度200，高度200，射线1=225，射线2=90 
           //g.DrawPie(pen1, r, 225, 90);
            
            //填充椭圆
            //g.FillPie(new SolidBrush(Color.Blue), 50, 50, 200, 200, 225, 90);
            //g.FillPie(new SolidBrush(Color.DarkOrange), r, 225, 90);
        }
        void BtnRectangle_Click(object sender, EventArgs e)
        { 
            Graphics g = this.CreateGraphics();
            Rectangle r = new Rectangle(10, 10, 200, 100);
            Pen pen1 = new Pen(Color.Black);
            //矩形
            g.DrawRectangle(pen1, 50, 50, 200, 200);  //起始坐标（50，50），宽度200，高度200
            g.DrawRectangle(pen1, r);
            //填充矩形
            g.FillRectangle(new SolidBrush(Color.Blue), 50, 50, 200, 200);
            g.FillRectangle(new SolidBrush(Color.DarkOrange), r);
    
        }
        void BtnDrawEllipse_Click(object sender, EventArgs e)
        {
              Graphics g = this.CreateGraphics();
            Rectangle r = new Rectangle(310, 10, 500, 100);
            Pen pen1 = new Pen(Color.Black);
            //椭圆
            g.DrawEllipse(pen1, 350, 50, 200, 200);  //起始坐标（50，50），宽度200，高度200
            g.DrawEllipse(pen1, r);
            //填充椭圆
            g.FillEllipse(new SolidBrush(Color.Blue), 350, 50, 200, 200);
            g.FillEllipse(new SolidBrush(Color.DarkOrange), r);
        }
        void BtnDrawArc_Click(object sender, EventArgs e)
        {
              Graphics g = this.CreateGraphics();
            Rectangle r = new Rectangle(10, 10, 200, 100);
            Pen pen1 = new Pen(Color.Black);
            g.DrawArc(pen1, 50, 50, 200, 200, 180, 90); //起始坐标（50，50），宽度200，高度200，弧线的起始角度180°，弧线经过角度90°
            g.DrawArc(pen1, r, 0, 135);
        }
        void BtnClear_Click(object sender, EventArgs e)
        {
    
            Graphics g = this.CreateGraphics();
            g.Clear(Color.Red);
        }
        void Ball_Click(object sender, EventArgs e)
        {
            Graphics g = this.CreateGraphics();
            Pen pen1 = new Pen(Color.Black);
            //椭圆
            g.DrawEllipse(pen1, 0, 0, 200, 200);  
            
            //g.DrawEllipse(pen1, 0, 80, 200, 30);  
            //g.DrawEllipse(pen1, 80, 0, 30, 200);  
            g.DrawArc(pen1, 0, 80, 200, 30, 0, 180);
            g.DrawArc(pen1, 80, 0, 30, 200, 90, 180);
            
            float[] dashValues = {2,3};
            Pen blackPen = new Pen(Color.Black, 1);
            blackPen.DashPattern = dashValues;
            g.DrawArc(blackPen, 0, 80, 200, 30, 180, 180);
            g.DrawArc(blackPen, 80, 0, 30, 200, 270, 180);
          
        }
        void DrawString_Click(object sender, EventArgs e)
        {
            System.Drawing.Graphics formGraphics = this.CreateGraphics();
            string drawString = "Sample Text";
            System.Drawing.Font drawFont = new System.Drawing.Font("Arial", 16);
            System.Drawing.SolidBrush drawBrush = new System.Drawing.SolidBrush(System.Drawing.Color.Black);
            float x = 150.0F;
            float y = 50.0F;
            System.Drawing.StringFormat drawFormat = new System.Drawing.StringFormat();
            formGraphics.DrawString(drawString, drawFont, drawBrush, x, y, drawFormat);
            drawFont.Dispose();
            drawBrush.Dispose();
            formGraphics.Dispose();
    
        }
        void DrawVerticalString_Click(object sender, EventArgs e)
        {
            System.Drawing.Graphics formGraphics = this.CreateGraphics();
            string drawString = "Sample Text";
            System.Drawing.Font drawFont = new System.Drawing.Font("Arial", 16);
            System.Drawing.SolidBrush drawBrush = new System.Drawing.SolidBrush(System.Drawing.Color.Black);
            float x = 150.0F;
            float y = 50.0F;
            System.Drawing.StringFormat drawFormat = new System.Drawing.StringFormat();
            drawFormat.FormatFlags = StringFormatFlags.DirectionVertical;
            formGraphics.DrawString(drawString, drawFont, drawBrush, x, y, drawFormat);
            drawFont.Dispose();
            drawBrush.Dispose();
            formGraphics.Dispose();
        }
        void DrawPath_Click(object sender, EventArgs e)
        {
            // Create an array of points for the curve in the second figure.
            Point[] points = {
            new Point(40, 60),
            new Point(50, 70),
            new Point(30, 90)};
            
            GraphicsPath path = new GraphicsPath();
            
            path.StartFigure(); // Start the first figure.
            path.AddArc(175, 50, 50, 50, 0, -180);
            path.AddLine(100, 0, 250, 20);
            // First figure is not closed.
            
            path.StartFigure(); // Start the second figure.
            path.AddLine(50, 20, 5, 90);
            path.AddCurve(points, 3);
            path.AddLine(50, 150, 150, 180);
            path.CloseFigure(); // Second figure is closed.
            Graphics g = this.CreateGraphics();
            
            g.DrawPath(new Pen(Color.FromArgb(255, 255, 0, 0), 2), path);
        }
        void ThreedClick(object sender, EventArgs e)
        {
            Graphics g = this.CreateGraphics();
            Color red = Color.FromArgb(255, 0, 0);
            Pen blackPen = new Pen(Color.Black, 3);
            Point point1 = new Point(100, 100); //坐标（100，100）
            Point point2 = new Point(500, 100); //坐标（500，100）
            //g.DrawLine(blackPen, point1, point2); //两个坐标连成直线
            g.DrawLine(blackPen, 250, 300,700,300); //两个坐标连成直线
            g.DrawLine(blackPen, 300, 250,300,700); //两个坐标连成直线
            g.DrawLine(blackPen, 300, 300,700,300); //两个坐标连成直线
    
        }
    }
}