On Sat, Feb 13, 2010 at 1:27 PM, [email protected] <[email protected]>wrote:
> Thanks for reply
>
> code is as per bellow
>
> using System;
> using System.Data;
> using System.Configuration;
> using System.Collections;
> using System.Web;
> using System.Web.Security;
> using System.Web.UI;
> using System.Web.UI.WebControls;
> using System.Web.UI.WebControls.WebParts;
> using System.Web.UI.HtmlControls;
> using System.IO;
> using System.Drawing;
> using System.Drawing.Imaging;
> using System.Drawing.Text;
> using System.Drawing.Drawing2D;
>
> public partial class rotateimage : System.Web.UI.Page
> {
> protected void Page_Load(object sender, EventArgs e)
> {
> String imagepath = pathstr() + "Images\\sellimage.jpg";
> Bitmap bmp_conv_dpi = new Bitmap(imagepath);
> System.Drawing.Image i =
> Rotateimage((System.Drawing.Image)bmp_conv_dpi,double.Parse(
> queryStringValue(Request,"angle",
> 0)));
> MemoryStream ms = new MemoryStream();
> i.Save(ms, ImageFormat.Png);
> Response.ContentType = "image/PNG";
> ms.WriteTo(Response.OutputStream);
> Response.End();
> }
> public string pathstr()
> {
> return System.AppDomain.CurrentDomain.BaseDirectory;
> }
> public static System.Drawing.Image
> Rotateimage(System.Drawing.Image image, double angle)
> {
>
> if (image == null)
> {
> throw new ArgumentNullException("image");
> }
> float oldWidth = (float)image.Width;
> float oldHeight = (float)image.Height;
>
> // Ensure angle is [0, 360)
> angle = angle % 360f;
> if (angle < 0.0)
> {
> angle += 360f;
> }
>
> PointF[] corners = new PointF[4];
> // corners, clockwise from upper left
> // corners[0] is origin
> corners[1].X = oldWidth;
> corners[2].X = oldWidth;
> corners[2].Y = oldHeight;
> corners[3].Y = oldHeight;
>
> // rotate about origin
> Matrix m = new Matrix();
> m.Rotate((float)angle);
> m.TransformPoints(corners);
>
> // compute bounds of transformed corners from largest and
> smallest x and y values
> double maxX = Double.MinValue;
> double maxY = Double.MinValue;
> double minX = Double.MaxValue;
> double minY = Double.MaxValue;
> foreach (PointF p in corners)
> {
> maxX = Math.Max(maxX, p.X);
> minX = Math.Min(minX, p.X);
> maxY = Math.Max(maxY, p.Y);
> minY = Math.Min(minY, p.Y);
> }
> double newWidth = Math.Ceiling(maxX - minX);
> double newHeight = Math.Ceiling(maxY - minY);
>
> Bitmap rotatedBmp = new Bitmap((int)newWidth, (int)newHeight);
> using (Graphics g = Graphics.FromImage(rotatedBmp))
> {
> // center of new image
> PointF center = new PointF((float)(newWidth / 2), (float)
> (newHeight / 2));
> g.SmoothingMode =
> System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
> // position to draw old image to center it in new one
> PointF position = new PointF(center.X - oldWidth / 2,
> center.Y - oldHeight / 2);
>
> // rotate about center and draw
> m.Reset();
> m.RotateAt((float)angle, center);
> g.Transform = m;
> g.DrawImage(image, position);
> m.Reset();
>
>
> g.InterpolationMode =
> System.Drawing.Drawing2D.InterpolationMode.Bicubic;
> }
>
>
>
>
> return rotatedBmp;
> }
> public static string queryStringValue(HttpRequest wr, string key,
> object defaultValue)
> {
> try
> {
> return wr.QueryString[key].ToString();
> }
> catch (Exception)
> { }
> return defaultValue.ToString();
> }
> }
>
>
> On Feb 11, 4:27 pm, Jamie Fraser <[email protected]> wrote:
> > The effect you are seeing is image distortion due to the
> square/rectangular
> > pixels on a display screen being unable to display a straight edge when
> the
> > edge is non-orthogonal with the actual display grid.
> >
> > You need to implement anti-aliasing of some sort to reduce this effect.
> >
> > If you need any help specific to implementing anti-aliasing in your
> > solution, post the code you have so far.
> >
> > On Thu, Feb 11, 2010 at 6:50 AM, [email protected] <
> [email protected]>wrote:
> >
> > > not it is not spam , it's urgent to solve
> >
> > > On Feb 10, 5:49 pm, Processor Devil <[email protected]> wrote:
> > > > spam?
> >
> > > > 2010/2/10 [email protected] <[email protected]>
> >
> > > > > please check url below and find how the image distorts at edges on
> > > > > giving rotation angles like 5,10,50 etc. however the edges are
> smooth
> > > > > and crisp on 45 degree
> >
> > > > >http://cybersurf.in/rotationtesting.aspx
> >
> > > > > please provide solution ASAP.
>
