C # Image Processing (1): Add text to the image and change the direction of the text

C # add text to the image. The Code is as follows:

1 /// <summary> 2 // Add text above the image, the text will be reversed by 180 degrees. 3 // </Summary> 4 // <Param name = "IMG"> image to be processed </param> 5 /// <Param name = "writestring"> written string </param> 6 // <Param name = "upmargin"> 180 degrees reverse, the distance from the top of the text to the top of the text </param> 7/ // <Param name = "rightmargin"> the leftmost text distance from the right edge </param> 8 /// <returns> bitmap </returns> 9 Public bitmap writeup (image img, string writestring, int upmargin, int rightmargin) 10 {11 return writeup (IMG, writestring, upmargin, rightmargin, "", 20 ); 12} 13 14 // <summary> 15 // Add text above the picture, the text will be reversed by 180 degrees. 16 /// </Summary> 17 /// <Param name = "IMG"> image to be processed </param> 18 /// <Param name = "writestring"> written string </param> 19 // <Param name = "upmargin"> the distance between the top of the text and the top edge of the text after the 180 degree reversal </param> 20/ // <Param name = "rightmargin"> the leftmost text distance from the right edge </param> 21 // <Param name = "fonttype"> font type </param> 22 /// <Param name = "fontsize"> font size </param> 23 // <returns> </returns> 24 public bitmap writeup (image IMG, string writestring, int upmargin, int rightmargin, string fonttype, int fontsize) 25 {26 // get the image width and height 27 int width = IMG. width; 28 int Height = IMG. height; 29 // obtain the horizontal and vertical resolutions of the image. 30 float dpix = IMG. horizontalresolution; 31 float dpiy = IMG. verticalresolution; 32 // create a bitmap file 33 bitmap bitmapresult = new Bitmap (width, height, pixelformat. format24bpprgb); 34 // sets the horizontal and vertical resolutions of Bitmap files to be consistent with that of IMG 35 bitmapresult. setresolution (dpix, dpiy); 36 // fill in a Rectangular Box 37 graphics GRP = graphics in the bitmap file. fromimage (bitmapresult); 38 system. drawing. rectangle rec = new system. drawing. rectangle (0, 0, width, height); 39 // fill img40 GRP in the rectangle. drawimage (IMG, 0, 0, REC, graphicsunit. pixel); 41 42 43 // Pan graphics object 44 GRP. translatetransform (width-rightmargin, upmargin); 45 // set the output angle of the graphics object to change the text direction. 46 GRP. rotatetransform (180); 47 // set the text fill color 48 brush = brushes. black; 49 // rotate the display text 50 GRP. drawstring (writestring, new font (fonttype, fontsize, graphicsunit. pixel), brush, 0, 0); 51 // restore the global transformation matrix 52 GRP. resettransform (); 53 GRP. dispose (); 54 GC. collect (); 55 return bitmapresult; 56}