[C#]투명한 버튼

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;
 
namespace App1ButtonImage
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            SetButtonBackImage(button1);
            SetButtonBackImage(button2);
            SetButtonBackImage(button3);
            SetButtonBackImage(button4);
            SetButtonBackImage(button5);
            SetButtonBackImage(button6);            
        }
 
        private void SetButtonBackImage(Button button)
        {
            Point ptImg = new Point(0, 0);
            ptImg = this.PointToScreen(ptImg);
 
            Point ptBtn = new Point(0, 0);
            ptBtn = button.PointToScreen(ptBtn);
 
            int intXOffset = ptBtn.X - ptImg.X;
            int intYOffset = ptBtn.Y - ptImg.Y;
 
            Bitmap bitmap = new Bitmap(button.ClientSize.Width
                                               , button.ClientSize.Height);
            using (Graphics gr = Graphics.FromImage(bitmap))
            {
                Rectangle btn_rect = new Rectangle(0, 0, button.ClientSize.Width
                                                       , button.ClientSize.Height);
                Rectangle src_rect = new Rectangle(intXOffset, intYOffset
                                                 , button.ClientSize.Width
                                                 , button.ClientSize.Height);
 
                gr.DrawImage(this.BackgroundImage, btn_rect, src_rect, GraphicsUnit.Pixel);
            }
 
            button.BackgroundImage = bitmap;
        }
    }
}
 

몇 픽셀 정도 차이나는데 어차피 이런 코딩할일이 없으니 패스

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