Unit 10 影像/檔案讀取

Unit 10A

檔案讀取視窗

//開啟檔案讀取視窗，成功則將檔案指定給字串fn

            string fn = ""; //""為空字串

            if (openFileDialog1.ShowDialog() == DialogResult.OK)//顯示對話方塊

                fn = openFileDialog1.FileName;

Unit 10B

Image影像檔案讀取

            //宣告影像變數讀取檔案

            Image im1= Image.FromFile(fn); 

Unit 10C

指定繪圖畫布，繪出影像

//建立f2視窗的繪圖畫布(指定畫布在左上角0,0的位置)

            Graphics g = f2.CreateGraphics();

            g.DrawImage(im1, 0, 0);

Unit 10D

新設視窗

Form f2 = new Form();

//顯示視窗

f2.Show();

練習題:

//按button開啟檔案後顯示在新視窗，視窗大小為影像大小

//定義30個Point型態的座標資料，按button後在新視窗顯示這些點，這些點以小圓點表示，圓心為Point座標，直徑為4

            int rdX, rdY;

            Form f3 = new Form();

            f3.Width = 800;

            f3.Height = 480;

            f3.Show();

            Graphics g= f3.CreateGraphics();

            for (int i = 0; i < 30; i++)

            {

                rdX = rd.Next(50, 750);

                rdY = rd.Next(50, 430);

                g.FillEllipse(Brushes.Red, rdX, rdY, 4, 4);

                String str = "(" + rdX + "," + rdY + ")";

                g.DrawString(str, new System.Drawing.Font("Arial", 8), Brushes.Black, (float)rdX, (float)rdY);

               

            }

++++++++++++++++++++++++++++++++++++++++++


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 影像讀取
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            //開啟檔案讀取視窗，成功則將檔案指定給字串fn
            string fn = ""; //""為空字串
            if (openFileDialog1.ShowDialog() == DialogResult.OK)//顯示對話方塊
                fn = openFileDialog1.FileName;
            label1.Text = fn;

            //宣告影像變數讀取檔案
            Image im1= Image.FromFile(fn);

            //新設視窗(做自己的繪圖畫布,建立視窗)
            //練習:讓選取的影像大小等於顯示視窗的大小
            Form f2 = new Form();
            f2.Width = im1.Width;
            f2.Height = im1.Height;
            f2.BackColor = Color.FromArgb(126, 60, 255);
            //顯示視窗
            f2.Show();

            //建立f2視窗的繪圖畫布(指定畫布在左上角0,0的位置)
            Graphics g = f2.CreateGraphics();
            g.DrawImage(im1, 0, 0);


         
        }
Random rd = new Random();
       Point[] p = new Point[30];

        private void button2_Click(object sender, EventArgs e)
        {
            //定義30個Point型態的座標資料，按button後在新視窗顯示這些點，
            //這些點以小圓點表示，圓心為Point座標，直徑為4
            //g.FillEllipse(Brushes.Red, 50, 100, 4, 4);
            int rdX, rdY;
            Form f3 = new Form();
            f3.Width = 800;
            f3.Height = 480;
            f3.Show();
            Graphics g= f3.CreateGraphics();
            for (int i = 0; i < 30; i++)
            {
                rdX = rd.Next(50, 750);
                rdY = rd.Next(50, 430);
                g.FillEllipse(Brushes.Red, rdX, rdY, 4, 4);
                String str = "(" + rdX + "," + rdY + ")";
                g.DrawString(str, new System.Drawing.Font("Arial", 8), Brushes.Black, (float)rdX, (float)rdY);
             
            }
                   private void button3_Click(object sender, EventArgs e)
        {
            int rd1X, rd1Y;
            Form f4 = new Form();
            f4.Width = 800;
            f4.Height = 480;
            f4.Show();
            Graphics g = f4.CreateGraphics();
            for (int i = 0; i < 10; i++)
            {
                rd1X = rd.Next(0, 800);
                rd1Y = rd.Next(50, 430);
                g.FillRectangle(Brushes.BlueViolet, rd1X, rd1Y, 3, 480);

            }


        }
    }
}