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Код


Graphics gr=this.pictureBox1.CreateGraphics();
   gr.DrawLine(marg, 640 / 3, 0, 640 / 3, 480);//марг пен(колор)

Код


Bitmap bm = new Bitmap(picturebox1.Width, picturebox1.Height);
picturebox1.Image = bm;

Код


Graphics g = Graphics.FromImage(picturebox1.Image);
//здесь код прорисовки

Код


      Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height);
            pictureBox1.Image = bmp;
            Graphics gr = Graphics.FromImage(pictureBox1.Image);
            gr.DrawRectangle(marg, 0, 0, 640, 480);

           SaveFileDialog dialog = new SaveFileDialog();
            dialog.Filter= ".jpg | *.jpg"; 
           
            if (dialog.ShowDialog() == DialogResult.OK)
            {
                pictureBox1.Image.Save(dialog.FileName, ImageFormat.Jpeg);
            }

Код


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;

namespace Graphics
{
    public partial class frmLab1 : Form
    {
           
        public frmLab1()
        {
            InitializeComponent();
          
        }

        private void frmLab1_Load(object sender, EventArgs e)
        {

        }

        private void toolStripButton1_Click(object sender, EventArgs e)
        {       
           Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height);
            pictureBox1.Image = bmp;
             System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(pictureBox1.Image);//colori pen si brush 
            Pen chenar = new Pen(Color.Black, 3);
            Pen contur = new Pen(Color.Red, 2);
            SolidBrush fon_ob = new SolidBrush(Color.LightBlue);
            Pen contur2 = new Pen(Color.SkyBlue, 2);
           // end
            //start chenar
            gr.DrawRectangle(chenar, 0, 1, 640, 480);
            gr.DrawLine(chenar, 640 / 3, 0, 640 / 3, 480);
            gr.DrawLine(chenar, 640 / 3 * 2, 0, 640 / 3 * 2, 480);
            gr.DrawLine(chenar, 0, 480 / 3 * 2, 640, 480 / 3 * 2);
            gr.DrawLine(chenar, 0, 480 / 3, 640, 480 / 3);
            //end chenar start graphics object
            //1
            Draw3D_nestap dd = new Draw3D_nestap(gr);
            dd.Draw3D_paralelipiped_dreapta(fon_ob,contur2, 35 , 50,100,75);
        }

        private void toolStripButton4_Click(object sender, EventArgs e)
        {
            Close();
        }

        private void toolStripButton2_Click(object sender, EventArgs e)
        {
            SaveFileDialog sv = new SaveFileDialog();
            sv.FileName = "Graphics lab_1";
            sv.Filter = "JPG files (*.jpg)|*.jpg|All files (*.*)|*.*";
            if (sv.ShowDialog() == DialogResult.OK)
                pictureBox1.Image.Save(sv.FileName, System.Drawing.Imaging.ImageFormat.Jpeg);

        }

        private void toolStripButton3_Click(object sender, EventArgs e)
        {
            OpenFileDialog op = new OpenFileDialog();
            op.Filter = "JPG files (*.jpg)|*.jpg|All files (*.*)|*.*";
            if (op.ShowDialog() == DialogResult.OK)
                pictureBox1.Load(op.FileName);
        }
    }
}

Код


        private void toolStripButton1_Click(object sender, EventArgs e)
        {
            Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height);
            pictureBox1.Image = bmp;
            System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(pictureBox1.Image);//colori pen si brush 
            Pen chenar = new Pen(Color.Black, 3);
            Pen contur = new Pen(Color.Red, 2);
            SolidBrush fon_ob = new SolidBrush(Color.LightBlue);
            Pen contur2 = new Pen(Color.SkyBlue, 2);
            // end
            //start chenar
            gr.Clear(Color.White);
            gr.DrawRectangle(chenar, 0, 1, 640, 480);
            gr.DrawLine(chenar, 640 / 3, 0, 640 / 3, 480);
            gr.DrawLine(chenar, 640 / 3 * 2, 0, 640 / 3 * 2, 480);
            gr.DrawLine(chenar, 0, 480 / 3 * 2, 640, 480 / 3 * 2);
            gr.DrawLine(chenar, 0, 480 / 3, 640, 480 / 3);
            //end chenar start graphics object
            //1
            Draw3D_nestap dd = new Draw3D_nestap(gr);
            dd.Draw3D_paralelipiped_dreapta(fon_ob, contur2, 35, 50, 100, 75);
        }