도형그리기를 비트맵이미지로 그리기

DrawShapeToBitmapInMemory.zip

private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;

// Create a Bitmap image in memory and set its CompositingMode
Bitmap bmp = new Bitmap(this.Size.Width, this.Size.Height,
PixelFormat.Format32bppArgb);
Graphics gBmp = Graphics.FromImage(bmp);
gBmp.CompositingMode = CompositingMode.SourceCopy;

// Pen으로 대각선과 사각형 그리기 (to bitmap in memory)
Pen p = new Pen(Color.Black, 3);
Rectangle r = new Rectangle(10, 10, this.Size.Width/2, this.Size.Height/2);
gBmp.DrawLine(p, 10, 10, this.Size.Width / 2 + 10, this.Size.Height / 2 + 10);
gBmp.DrawLine(p, this.Size.Width / 2 + 10, 10, 10, this.Size.Height / 2 + 10);
gBmp.DrawRectangle(p, r);

// Brush로 파란사각형 그리기 (to bitmap in memory)
Brush b = new SolidBrush(Color.Blue);
Rectangle r2 = new Rectangle(this.Size.Width / 2 + 10, this.Size.Height / 2 + 10,
this.Size.Width / 2 – 10, this.Size.Height / 2 – 10);
gBmp.FillRectangle(b, r2);

// Brush로 빨간삼각형 그리기 (to bitmap in memory)
Brush b2 = new SolidBrush(Color.Red);
Point[] pt = new Point[3];
pt[0].X = 400; pt[0].Y = 10;
pt[1].X = 300; pt[1].Y = 210;
pt[2].X = 500; pt[2].Y = 210;
gBmp.FillPolygon(b2, pt);

// HatchBrush로 타원 그리기 (to bitmap in memory)
HatchBrush hb = new HatchBrush(HatchStyle.DiagonalCross,
Color.Yellow, Color.Brown);
gBmp.FillEllipse(hb, 10, 220, 200, 100);

// DrawArc 메소드 사용하여 호 그리기 (to bitmap in memory)
Pen p2 = new Pen(Color.Green, 3);
Rectangle r3 = new Rectangle(220, 220, 200, 100);
gBmp.DrawArc(p2, r3, 0, 180);

// draw the bitmap on our window
g.DrawImage(bmp, 0, 0, bmp.Width, bmp.Height);
bmp.Dispose();
gBmp.Dispose();
}