첨부 실행 코드는 나눔고딕코딩 폰트를 사용합니다.
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TestProject.zip
다운로드

▶ MainForm.cs

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace TestProject
{
    /// <summary>
    /// 메인 폼
    /// </summary>
    public partial class MainForm : Form
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Field
        ////////////////////////////////////////////////////////////////////////////////////////// Private

        #region Field

        /// <summary>
        /// 비트맵 1
        /// </summary>
        private Bitmap bitmap1;
        
        /// <summary>
        /// 비트맵 2
        /// </summary>
        private Bitmap bitmap2;

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public
 
        #region 생성자 - MainForm()

        /// <summary>
        /// 생성자
        /// </summary>
        public MainForm()
        {
            InitializeComponent();

            Load                   += Form_Load;
            this.pictureBox1.Paint += pictureBox1_Paint;
            this.pictureBox2.Paint += pictureBox2_Paint;
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Private
        //////////////////////////////////////////////////////////////////////////////// Event

        #region 폼 로드시 처리하기 - Form_Load(sender, e)

        /// <summary>
        /// 폼 로드시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void Form_Load(object sender, EventArgs e)
        {
            int width  = this.pictureBox1.ClientSize.Width;
            int height = this.pictureBox1.ClientSize.Height;

            this.bitmap1 = new Bitmap(width, height);

            using(Graphics graphics = Graphics.FromImage(this.bitmap1))
            {
                graphics.SmoothingMode = SmoothingMode.AntiAlias;

                graphics.Clear(Color.White);

                DrawSmiley(graphics, this.pictureBox1.ClientRectangle, 10);

                this.bitmap1.MakeTransparent(Color.White);
            }

            this.bitmap2 = new Bitmap(width, height);

            using(Graphics graphics = Graphics.FromImage(this.bitmap2))
            {
                graphics.SmoothingMode = SmoothingMode.AntiAlias;

                graphics.Clear(Color.Transparent);

                DrawSmiley(graphics, this.pictureBox1.ClientRectangle, 10);
            }
        }

        #endregion
        #region 픽처 박스 1 페인트시 처리하기 - pictureBox1_Paint(sender, e)

        /// <summary>
        /// 픽처 박스 1 페인트시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.Clear(Color.Blue);

            e.Graphics.DrawImage(this.bitmap1, 0, 0);
        }

        #endregion
        #region 픽처 박스 2 페인트시 처리하기 - pictureBox2_Paint(sender, e)

        /// <summary>
        /// 픽처 박스 2페인트시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void pictureBox2_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.Clear(Color.Blue);

            e.Graphics.DrawImage(this.bitmap2, 0, 0);
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////// Function

        #region 웃는 얼굴 그리기 - DrawSmiley(graphics, rectangle, width)

        /// <summary>
        /// 웃는 얼굴 그리기
        /// </summary>
        /// <param name="graphics">그래픽스</param>
        /// <param name="rectangle">사각형</param>
        /// <param name="width">너비</param>
        private void DrawSmiley(Graphics graphics, Rectangle rectangle, int width)
        {
            rectangle.Inflate(-4, -4);

            using(Pen pen = new Pen(Color.Black, width))
            {
                // 얼굴
                Rectangle faceRectangle = new Rectangle
                (
                    rectangle.Left + width / 2,
                    rectangle.Top  + width / 2,
                    rectangle.Width - width,
                    rectangle.Height - width
                );

                graphics.FillEllipse(Brushes.Yellow, faceRectangle);

                graphics.DrawEllipse(pen, faceRectangle);

                // 입
                pen.Width /= 2;

                faceRectangle.Inflate(-30, -30);

                graphics.DrawArc(pen, faceRectangle, 10, 160);

                // 왼쪽 눈
                int eyeWidth  = (int)(rectangle.Width  * 0.2 );
                int eyeHeight = (int)(rectangle.Height * 0.25);

                Rectangle eyeRectangle = new Rectangle
                (
                    (int)(rectangle.Left + rectangle.Width  * 0.25),
                    (int)(rectangle.Top  + rectangle.Height * 0.20),
                    eyeWidth,
                    eyeHeight
                );

                graphics.FillEllipse(Brushes.LightBlue, eyeRectangle);

                graphics.DrawEllipse(pen, eyeRectangle);

                Rectangle pupilRectangle = new Rectangle
                (
                    eyeRectangle.Left + eyeWidth  / 2,
                    eyeRectangle.Top  + eyeHeight / 4,
                    eyeWidth  / 2,
                    eyeHeight / 2
                );

                graphics.FillEllipse(Brushes.Black, pupilRectangle);

                graphics.DrawEllipse(pen, pupilRectangle);

                // 오른쪽 눈
                eyeRectangle = new Rectangle
                (
                    (int)(rectangle.Right - rectangle.Width  * 0.25) - eyeWidth,
                    (int)(rectangle.Top   + rectangle.Height * 0.20),
                    eyeWidth,
                    eyeHeight
                );

                graphics.FillEllipse(Brushes.LightBlue, eyeRectangle);

                graphics.DrawEllipse(pen, eyeRectangle);

                pupilRectangle = new Rectangle
                (
                    eyeRectangle.Left + eyeWidth  / 2,
                    eyeRectangle.Top  + eyeHeight / 4,
                    eyeWidth  / 2,
                    eyeHeight / 2
                );

                graphics.FillEllipse(Brushes.Black, pupilRectangle);

                graphics.DrawEllipse(pen, pupilRectangle);

                // 코
                Rectangle noseRectangle = new Rectangle
                (
                    (int)(rectangle.Left + rectangle.Width / 2) - eyeWidth / 2,
                    (int)(rectangle.Top  + rectangle.Height * 0.45),
                    eyeWidth,
                    eyeWidth
                );

                graphics.FillEllipse(Brushes.LightGreen, noseRectangle);

                graphics.DrawEllipse(pen, noseRectangle);
            }
        }

        #endregion
    }
}
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