회전/ Format32bppArgb/ GraphicsPath/ AddRectAngle/ Matrix()/ Rotate/ GetBounds

회전/ Format32bppArgb/ GraphicsPath/ AddRectAngle/ Matrix()/ Rotate/ GetBounds

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Drawing.Drawing2D;
using System.Drawing.Imaging;

namespace Rotation
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public static Bitmap BitmapRotate(Bitmap bmp, float angle, Color bkColor)
        {
            int w = bmp.Width + 2;
            int h = bmp.Height + 2;

            PixelFormat pf;

            if (bkColor == Color.Transparent)
                pf = PixelFormat.Format32bppArgb;
            else
                pf = bmp.PixelFormat;

            Bitmap tmp = new Bitmap(w, h, pf);
            Graphics g = Graphics.FromImage(tmp);
            g.Clear(bkColor);
            g.DrawImageUnscaled(bmp, 1, 1);
            g.Dispose();

            GraphicsPath path = new GraphicsPath();
            path.AddRectangle(new RectangleF(0f, 0f, w, h));
            Matrix mtrx = new Matrix();
            mtrx.Rotate(angle);
            RectangleF rct = path.GetBounds(mtrx);

            Bitmap dst = new Bitmap((int)rct.Width, (int)rct.Height, pf);
            g = Graphics.FromImage(dst);
            g.Clear(bkColor);
            g.TranslateTransform(-rct.X, -rct.Y);
            g.RotateTransform(angle);
            g.InterpolationMode = InterpolationMode.HighQualityBilinear;
            g.DrawImageUnscaled(tmp, 0, 0);
            g.Dispose();

            tmp.Dispose();

            return dst;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Bitmap bmp = new Bitmap(@"C:\Home\img\yui11.png");

            int w = bmp.Width;
            int h = bmp.Height;

            Pen pn = new Pen(Color.Yellow, 1f);

            Graphics g = this.CreateGraphics();
            g.DrawImageUnscaled(bmp, 5, 5);

            Bitmap tmp = BitmapRotate(bmp, 12, this.BackColor);
            g.DrawImageUnscaled(tmp, w + 10, 5);
            g.DrawRectangle(pn, new Rectangle(w + 10, 5, tmp.Width, tmp.Height));
            tmp.Dispose();

            tmp = BitmapRotate(bmp, 192, this.BackColor);
            g.DrawImageUnscaled(tmp, 5, h + 30);
            g.DrawRectangle(pn, new Rectangle(5, h + 30, tmp.Width, tmp.Height));
            tmp.Dispose();

            tmp = BitmapRotate(bmp, 282, this.BackColor);
            g.DrawImageUnscaled(tmp, h + 30, h + 50);
            g.DrawRectangle(pn, new Rectangle(h + 30, h + 50, tmp.Width, tmp.Height));
            tmp.Dispose();

            g.Dispose();
            pn.Dispose();

            bmp.Dispose();
        }

    }
}