求教，怎么让图片旋转的慢一点啊？
本帖最后由 plokmijnu8 于 2013-03-10 10:23:04 编辑 我在这个论坛里找到前辈发的一个随意调整旋转角度的程序，但是不怎么理解。现在怎么让旋转速度慢一点啊？
private void Form5_Load(object sender, EventArgs e)
{
InitializeBitmap();
}
Bitmap bitmap1;
private void InitializeBitmap()
{
try
{
bitmap1 = (Bitmap)Bitmap.FromFile(@"D:\singerPhoto\bobo.jpg");
pictureBox1.SizeMode = PictureBoxSizeMode.AutoSize;
pictureBox1.Image = bitmap1;
}
catch (System.IO.FileNotFoundException)
{
MessageBox.Show("There was an error." +
"Check the path to the bitmap.");
}
}
private void Button1_Click(System.Object sender, System.EventArgs e)
{
if (bitmap1 != null)
{
Bitmap a = new Bitmap(pictureBox1.Image);//得到图片框中的图片
pictureBox1.Image = Rotate(a, 30);//这里的30为度数
pictureBox1.Refresh();//最后刷新图片框
}
}
public Bitmap Rotate(Bitmap b, int angle)
{
angle = angle % 360;
//弧度转换
double radian = angle * Math.PI / 180.0;
double cos = Math.Cos(radian);
double sin = Math.Sin(radian);
//原图的宽和高
int w = b.Width;
int h = b.Height;
int W = (int)(Math.Max(Math.Abs(w * cos - h * sin), Math.Abs(w * cos + h * sin)));
int H = (int)(Math.Max(Math.Abs(w * sin - h * cos), Math.Abs(w * sin + h * cos)));
//目标位图
Bitmap dsImage = new Bitmap(W, H);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(dsImage);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Bilinear;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//计算偏移量
Point Offset = new Point((W - w) / 2, (H - h) / 2);
//构造图像显示区域：让图像的中心与窗口的中心点一致
Rectangle rect = new Rectangle(Offset.X, Offset.Y, w, h);
Point center = new Point(rect.X + rect.Width / 2, rect.Y + rect.Height / 2);
g.TranslateTransform(center.X, center.Y);
g.RotateTransform(360 - angle);
//恢复图像在水平和垂直方向的平移
g.TranslateTransform(-center.X, -center.Y);
g.DrawImage(b, rect);
//重至绘图的所有变换
g.ResetTransform();
g.Save();
g.Dispose();
//dsImage.Save("yuancd.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
return dsImage;
[解决办法]
