form1.cs

画椭圆和矩形

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Collections;
using System.Drawing.Drawing2D;
using System.Drawing.Design;

namespace 第16次作业
{
    public partial class Form1 : Form
    {
        public ArrayList ArrayLines = new ArrayList();
        public ArrayList Arrayrec = new ArrayList();
        public ArrayList Arrayell = new ArrayList();
        public int x1, y1, x2, y2;
        public Pen p1;
        
        public Color c;
        public float w;
         int f;
         public Form1()
        {   
            InitializeComponent();
            f = 0;
            c = Color.Red;
            txtbox1.Text = "2"; 
            p1 = new Pen(Color.Black);
           // p1.Color = c;
            //p1.Width = 2;
         
        }
        public class cline
        {   
            public float  kuandu;
            public Color  col;
            public int x1;
            public int y1;
            public int x2;
            public int y2;
        }
        public class rectangle
        {
            public float  kuandu;
            public Color  col;
            public int x;
            public int y;
            public int width;
            public int height;
        }
        public class ellipse
        {
            public float  kuandu;
            public Color  col;
            public int x;
            public int y;
            public int width;
            public int height;

        }
         
        private void 画直线ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            f=1;
        }

        private void 画椭圆ToolStripMenuItem_Click(object sender, EventArgs e)
        {
             f = 2;
        }

        private void 画矩形ToolStripMenuItem_Click(object sender, EventArgs e)
        {
             f = 3;
        }

        private void 不画图ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            f = 0;
        }

       

        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            statuslbl1.Text = "(" + e.X.ToString() +","+ e.Y.ToString() + ")";
        }

        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            x1 = e.X ; y1 = e.Y;
            w  = float.Parse (txtbox1.Text);
       }

        private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
          //  Pen p1 = new Pen(Color. Black );
            //c = Color.Red;
            //txtbox1.Text = "2"; 
                p1.Color = c;
                p1.Width = w;  
            x2 = e.X; y2 = e.Y;
            if (f == 1)
            {
               
                Graphics gdi = this.CreateGraphics();
                gdi.DrawLine(p1 , new Point(x1, y1), new Point(x2, y2));
                cline ob = new cline();
                ob.x1 = x1; ob.y1 = y1;
                ob.x2 = x2; ob.y2 = y2;
                ob.col = p1.Color ;
                ob.kuandu = float.Parse (txtbox1.Text);
              
                ArrayLines.Add(ob);
            }
            if (f == 3)
            {
                int w1, h;
                Graphics gdi = this.CreateGraphics();
                w1 = System.Math.Abs(x1 - x2);
                h = System.Math.Abs(y1 - y2);
                //w1 = x2 - x1;
              //  h = y2 - y1;
                if (x1 <= x2)
                {
                    if (y1 < y2)
                        gdi.DrawRectangle(p1, x1, y1, w1, h);
                    else
                        gdi.DrawRectangle(p1, x1, y2, w1, h);
                }
                else
                {
                    if (y1 < y2)
                        gdi.DrawRectangle(p1, x2, y1, w1, h);
                    else
                        gdi.DrawRectangle(p1, x2, y2, w1, h);
                }


 
                rectangle ob = new rectangle();
                ob.x = x1; ob.y = y1;
                ob.width = w1; ob.height = h;
                ob.col = p1.Color;
                ob.kuandu = float .Parse  (txtbox1.Text);
                Arrayrec.Add(ob);
           

            }
            if (f ==2)
            {
                int w1, h;
                Graphics gdi = this.CreateGraphics();
                //w1 = System.Math.Abs(x2 - x1);
              //  h = System.Math.Abs(y2- y1);
                w1 = (x2 - x1);
                h = (y2 - y1);
                gdi.DrawEllipse(p1 , x1, y1, w1, h);

                ellipse ob = new ellipse();
                ob.x = x1; ob.y = y1;
                ob.width = w1; ob.height = h;
                ob.col = p1.Color;
                ob.kuandu =float .Parse  (txtbox1.Text);
                Arrayell.Add(ob);
            }
          

            
        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {
           // Pen p1 = new Pen(Color .Black );
            Graphics gdi = this.CreateGraphics();
            cline  ob;

            for (int i = 0; i< ArrayLines.Count; i++)
            {
                ob = (cline )ArrayLines[i];
                gdi.DrawLine(p1 , new Point(ob.x1, ob.y1), new Point(ob.x2, ob.y2));
            }
           
             rectangle  ob1;

            for (int i = 0; i < Arrayrec.Count; i++)
            {
                ob1 = (rectangle )Arrayrec[i];
                gdi.DrawRectangle (p1  , ob1.x, ob1.y,ob1.width ,ob1.height );
            }
           ellipse  ob2;

            for (int i = 0; i < Arrayell.Count; i++)
            {
                ob2= (ellipse )Arrayell[i];
                gdi.DrawEllipse (p1  , ob2.x, ob2.y, ob2.width, ob2.height);
            }

          
        }




   

        

        private void 颜色ToolStripMenuItem_Click_1(object sender, EventArgs e)
        {
            ColorDialog dlg = new ColorDialog();
            dlg.ShowDialog();
            c = dlg.Color;
        }

      

       
    }
}