[英]Rotate image using asp.net c# through textbox
how to rotate image through put in angle value in textbox using graphics in asp.net c#? 如何通过使用asp.net c#中的图形在文本框中输入角度值来旋转图像? I take a textbox and image and button.I want to give value in angle in textbox and image will be rotate according to given value.so,i can only doing a simple button_click event ,but it is not proper for textbox.so,give simple code ...
我带一个文本框和图像和按钮。我想在文本框中输入角度值,图像将根据给定的值旋转。所以,我只能做一个简单的button_click事件,但不适用于textbox.so,给定简单的代码...
protected void Button2_Click(object sender, EventArgs e)
{
string path = Server.MapPath(Image1.ImageUrl);
////create an image object from the image in that path
System.Drawing.Image img = System.Drawing.Image.FromFile(path);
////rotate the image
img.RotateFlip(RotateFlipType.Rotate90FlipXY);
////save the image out to the file
img.Save(path);
////release image file
img.Dispose();
}
Following code save the rotated image into newfile.png in current project folder path 以下代码将旋转后的图像保存到当前项目文件夹路径中的newfile.png中
Try This: 尝试这个:
protected void Button2_Click1(object sender, EventArgs e)
{
string path = Server.MapPath(Image1.ImageUrl);
string newpath =Server.MapPath(@"~/filename.png");
////create an image object from the image in that path
System.Drawing.Bitmap img =new System.Drawing.Bitmap(path);
Bitmap map = RotateBitmap(COnvert.ToSingle(textBox1.Text), img);
map.Save(newpath);
////release image file
img.Dispose();
}
public Bitmap RotateBitmap(float Angle, Bitmap bm_in)
{
try
{
float wid = bm_in.Width;
float hgt = bm_in.Height;
Point[] corners = { new Point(0, 0), new Point(int.Parse(wid.ToString()), 0), new Point(0, int.Parse(hgt.ToString())), new Point(int.Parse(wid.ToString()), int.Parse(hgt.ToString())) };
int cx = int.Parse(wid.ToString()) / 2;
int cy = int.Parse(hgt.ToString()) / 2;
long i;
for (i = 0; i <= 3; i++)
{
corners[i].X -= Convert.ToInt32(cx.ToString());
corners[i].Y -= Convert.ToInt32(cy.ToString());
}
float theta = (float)(Angle * Math.PI / 180.0);
float sin_theta = (float)Math.Sin(theta);
float cos_theta = (float)Math.Cos(theta);
float X;
float Y;
for (i = 0; i <= 3; i++)
{
X = corners[i].X;
Y = corners[i].Y;
corners[i].X = (int)(X * cos_theta + Y * sin_theta);
corners[i].Y = (int)(-X * sin_theta + Y * cos_theta);
}
float xmin = corners[0].X;
float ymin = corners[0].Y;
for (i = 1; i <= 3; i++)
{
if (xmin > corners[i].X)
xmin = corners[i].X;
if (ymin > corners[i].Y)
ymin = corners[i].Y;
}
for (i = 0; i <= 3; i++)
{
corners[i].X -= int.Parse(xmin.ToString());
corners[i].Y -= int.Parse(ymin.ToString());
}
Bitmap bm_out = new Bitmap((int)(-2 * xmin), (int)(-2 * ymin));
Graphics gr_out = Graphics.FromImage(bm_out);
// ERROR: Not supported in C#: ReDimStatement
Point[] temp = new Point[3];
if (corners != null)
{
Array.Copy(corners, temp, Math.Min(corners.Length, temp.Length));
}
corners = temp;
gr_out.DrawImage(bm_in, corners);
return bm_out;
}
catch (Exception ex)
{
string s = ex.Message;
return bm_in;
}
}
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