C# Desktop Moving Image Display - 바탕화면에 이미지 출력하고 움직이기

바탕화면에 이미지를 출력하고 움직여 보자.

 

폼과 버튼을 적당히 배치한다.

 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
using System.Runtime.InteropServices;
 
namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        [DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
        private static extern IntPtr GetDC(IntPtr hWnd);
 
        [DllImport("user32.dll", ExactSpelling = true)]
        private static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDC);
 
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            int step = 1;   // 이동 스텝
 
            Rectangle targetRect = new Rectangle(100, 150, 400, 400);   // 표시할 그림 사이즈(Horizontal: 100~499(400) pixel, Vertical: 150~549(400) pixel) 
            Point outPoint = new Point(500, 300);   // 모니터의 표시 위치(x, y)
 
            //Image img = Image.FromFile("Barbara.jpg");  // Resolution Horizontal: 300, Vertical: 300  
            // 이렇게 하면 이미지 파일과 아래 buffer 비트맵의 해상도(96, 96)가 달라서 (사이즈가) 제대로 표시되지 않는다.
            Bitmap img = new Bitmap(Image.FromFile("Barbara.jpg")); // Resolution Horizontal: 96, Vertical: 96
            Bitmap scr = ScreenCapture.Capture();
            Bitmap buffer = new Bitmap(targetRect.Width + step, targetRect.Height + step);
            IntPtr desktopDC = GetDC(IntPtr.Zero);
 
            Graphics dG = Graphics.FromHdc(desktopDC);
            Graphics bG = Graphics.FromImage(buffer);
            
            for (int i = 0, j = 0; i < 100; i += step, j += step)
            {
                bG.DrawImage(scr, 0, 0, new Rectangle(outPoint.X + i, outPoint.Y + j, targetRect.Width + step , targetRect.Height + step ), GraphicsUnit.Pixel);
                bG.DrawImage(img, step, step, targetRect, GraphicsUnit.Pixel);                
                dG.DrawImage(buffer, outPoint.X + i, outPoint.Y + j);
            }
 
            for (int i = 100, j = 100; i > 0; i -= step, j -= step)
            {
                bG.DrawImage(scr, 0, 0, new Rectangle(outPoint.X + i, outPoint.Y + j, targetRect.Width + step, targetRect.Height + step), GraphicsUnit.Pixel);
                bG.DrawImage(img, 0, 0, targetRect, GraphicsUnit.Pixel);
                dG.DrawImage(buffer, outPoint.X + i, outPoint.Y + j);
            }
 
            dG.Dispose();
            bG.Dispose();
            ReleaseDC(IntPtr.Zero, desktopDC);
        }
    }
 
    public class ScreenCapture
    {
        [DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
        private static extern IntPtr GetDC(IntPtr hWnd);
 
        [DllImport("user32.dll", ExactSpelling = true)]
        private static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDC);
 
        [DllImport("gdi32.dll", ExactSpelling = true)]
        private static extern IntPtr BitBlt(IntPtr hDestDC, int x, int y, int nWidth, int nHeight, IntPtr hSrcDC, int xSrc, int ySrc, int dwRop);
 
        [DllImport("user32.dll", EntryPoint = "GetDesktopWindow")]
        private static extern IntPtr GetDesktopWindow();
 
        public static Bitmap Capture()
        {
            int screenWidth = Screen.PrimaryScreen.Bounds.Width;
            int screenHeight = Screen.PrimaryScreen.Bounds.Height;
 
            Bitmap screenBmp = new Bitmap(screenWidth, screenHeight);
            Graphics g = Graphics.FromImage(screenBmp);
 
            IntPtr desktopDC = GetDC(GetDesktopWindow());
            IntPtr hDC = g.GetHdc();
 
            BitBlt(hDC, 0, 0, screenWidth, screenHeight, desktopDC, 0, 0, 0x00CC0020);    //SRCCOPY (DWORD)0x00CC0020
 
            ReleaseDC(GetDesktopWindow(), desktopDC);
            g.ReleaseHdc(hDC);
            g.Dispose();
 
            return screenBmp;
        }
    }
}

 

소스를 입력하고 빌드한다.

Barbara.jpg

0.05MB

 

실행하고 버튼을 클릭한다.

 

지정된 위치에 이미지가 출력되고 움직인다.