标签：winform io color ar os sp for div on
01.//可以实现任意角度的旋转，旋转出现的角落空白可以选择填充的颜色。
02. 03. 04.using System;05. 06.using System.Drawing;07.using System.Drawing.Drawing2D;08.using System.Drawing.Imaging;09.using System.Text;10.using System.Windows.Forms;11. 12.namespace bitmaprerote13.{14.public partial class Form1 : Form15.{16.public Form1()17.{18.InitializeComponent();19.}20.public static Bitmap KiRotate(Bitmap bmp, float angle, Color bkColor)21.{22.int w = bmp.Width + 2;23.int h = bmp.Height + 2;24. 25.PixelFormat pf;26. 27.if (bkColor == Color.Transparent)28.{29.pf = PixelFormat.Format32bppArgb;30.}31.else32.{33.pf = bmp.PixelFormat;34.}35. 36.Bitmap tmp = new Bitmap(w, h, pf);37.Graphics g = Graphics.FromImage(tmp);38.g.Clear(bkColor);39.g.DrawImageUnscaled(bmp, 1, 1);40.g.Dispose();41. 42.GraphicsPath path = new GraphicsPath();43.path.AddRectangle(new RectangleF(0f, 0f, w, h));44.Matrix mtrx = new Matrix();45.mtrx.Rotate(angle);46.RectangleF rct = path.GetBounds(mtrx);47. 48.Bitmap dst = new Bitmap((int)rct.Width, (int)rct.Height, pf);49.g = Graphics.FromImage(dst);50.g.Clear(bkColor);51.g.TranslateTransform(-rct.X, -rct.Y);52.g.RotateTransform(angle);53.g.InterpolationMode = InterpolationMode.HighQualityBilinear;54.g.DrawImageUnscaled(tmp, 0, 0);55.g.Dispose();56.tmp.Dispose();57.return dst;58.}59.private void button2_Click(object sender, EventArgs e)60.{61.Bitmap map = new Bitmap("F:\\hj.jpg");62.this.pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;63.map = KiRotate(map, 30, Color.Pink);64.pictureBox1.Image = map;65.}66.}67.}标签：winform io color ar os sp for div on
原文地址：http://www.cnblogs.com/jliuwork/p/4084166.html
