I have a bitmap in which i clone and specify a rectangle - the current rectangle has certain width and height values which i've used for checking the rectangle for a QR code. I noticed this checks the top left corner. I would i be able to alter this to check for top right corner, bottom right and left corners of the same size(width and height)?
Bitmap result = fullImg.Clone(new System.Drawing.Rectangle(0, 0, 375, 375), fullImg.PixelFormat);
Any help is greatly appreciated.
for (int pg = 0; pg < inputDocument.PageCount; pg++)
{
string workGif = workingFilename.Replace(".pdf", string.Format(".{0}.gif", pg + 1));
GhostscriptWrapper.GeneratePageThumb(workingFilename, workGif, pg + 1, 300, 300); // size (last two params) does not seem to have any effect
using (var fullImg = new Bitmap(workGif))
{
Bitmap result = fullImg.Clone(new System.Drawing.Rectangle(0, 0, 375, 375), fullImg.PixelFormat);
string QRinfo = Process(result);
MessageBox.Show(QRinfo);
string[] qcode = QRinfo.Split('/');
string gid = qcode[qcode.Count() - 1];
Guid pgGuid = new Guid(gid);
}
}
Process Method for qr
public string Process(Bitmap bitmap)
{
var reader = new com.google.zxing.qrcode.QRCodeReader();
try
{
LuminanceSource source = new RGBLuminanceSource(bitmap, bitmap.Width, bitmap.Height);
var binarizer = new HybridBinarizer(source);
var binBitmap = new BinaryBitmap(binarizer);
return reader.decode(binBitmap).Text;
}
catch (Exception e)
{
return e.Message;
}
}
If the QRCodes are ALWAYS on the corners, you can use a picturebox for the Bitmap, and then rotate it using the RotateFlip method:
Bitmap bp = new Bitmap("myImage.jpg");
pictureBox1.Image = bp;
bp.RotateFlip(RotateFlipType.Rotate90FlipNone);
pictureBox1.Invalidate();
Related
I'm trying to make an image cropping tool.
I am following this https://www.codeproject.com/Articles/703519/Cropping-Particular-Region-In-Image-Using-Csharp
But since it's a bit old and the plugin/DLL's it uses have changed I have been trying to adapt his code from OpenCvSharp 2.0 to OpenCvSharp 2.4
When I'm converting the bitmaps to IplImages and using Cv.Mul() it gives me this error:
Attempted to read or write protected memory. This is often an indication that other memory is corrupt
I have never used OpenCvSharp other ways of creating the IplImage even reading the IplImage from a written image.
Code:
public static IplImage BitmapToIplImage(Bitmap bitmap)
{
IplImage tmp, tmp2;
System.Drawing.Rectangle bRect = new System.Drawing.Rectangle(new System.Drawing.Point(0, 0), new System.Drawing.Size((int)bitmap.Width, (int)bitmap.Height));
BitmapData bmData = bitmap.LockBits(bRect, ImageLockMode.ReadWrite, bitmap.PixelFormat);
tmp = Cv.CreateImage(Cv.Size(bitmap.Width, bitmap.Height), BitDepth.U8, 3);
tmp2 = Cv.CreateImage(Cv.Size(bitmap.Width, bitmap.Height), BitDepth.U8, 1);
byte[] data = new byte[Math.Abs(bmData.Stride * bmData.Height)];
tmp.SetData(bmData.Scan0, data.Length);
bitmap.UnlockBits(bmData);
// Cv.CvtColor(tmp, tmp2, ColorConversion.RgbToGray);
return tmp;
}
private void CropImage()
{
IplImage ipl = Cv.CreateImage(new CvSize(curBmp.Width, curBmp.Height), BitDepth.U8, 3);
Graphics ga = Graphics.FromImage(curBmp);
ga.FillRectangle(new SolidBrush(System.Drawing.Color.Black), new System.Drawing.Rectangle(0, 0, curBmp.Width, curBmp.Height));
SolidBrush brush = new SolidBrush(System.Drawing.Color.FromArgb(1, 1, 1));
curGraphics.FillClosedCurve(brush, imagePoints.ToArray());
Cv.Mul(BitmapToIplImage(curOgBmp), BitmapToIplImage(curBmp), ipl, 1);
ComputeCrop();
Stream s = null;
ipl.ToStream(s, ".png", null);
curBmp = new Bitmap(s);
RefreshImageViewer();
}
-----------------------------EDIT-----------------------------------------
I tried to follow what Markus posted, and I got it to work without any errors in the code.
Although the image cropped is a bit strange here are the methods I use, plus the RefreshImageViewer that is how I put the bitmap in the image control.
I have been trying to see if I missed something for hours, but I think not.
Output example: Imgur image link
Code:
public void RefreshImageViewer()
{
bmpSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
curBmp.GetHbitmap(),
IntPtr.Zero,
System.Windows.Int32Rect.Empty,
BitmapSizeOptions.FromWidthAndHeight(curBmp.Width, curBmp.Height));
imageViewer.Source = bmpSource;
curGraphics = Graphics.FromImage(curBmp);
}
private void CropImage()
{
Graphics Ga = Graphics.FromImage(curBmp);
//the black image
Ga.FillRectangle(new SolidBrush(System.Drawing.Color.Black), new System.Drawing.Rectangle(0, 0, curBmp.Width, curBmp.Height));
//draw from the last point to first point
Ga.DrawLine(new System.Drawing.Pen(System.Drawing.Color.Red, 3), imagePoints[imagePoints.Count - 1], imagePoints[0]);
//all of the rgb values are being set 1 inside the polygon
SolidBrush Brush = new SolidBrush(System.Drawing.Color.FromArgb(1, 1, 1));
//we have to prepare one mask of Multiplying operation for cropping region
curGraphics.FillPolygon(Brush, imagePoints.ToArray());
Mat accc = (BitmapToMat(curOgBmp).Mul(BitmapToMat(curBmp))).ToMat();
System.Drawing.Rectangle r = ComputeCrop();
curBmp = accc.ToBitmap().Clone(r, curOgBmp.PixelFormat);
RefreshImageViewer();
}
private System.Drawing.Rectangle ComputeCrop()
{
int smallestX = curBmp.Width, biggestX = 0, biggestY = 0, smallestY = curBmp.Height;
for (int i = 0; i < imagePoints.Count; i++)
{
biggestX = Math.Max(biggestX, imagePoints[i].X);
smallestX = Math.Min(smallestX, imagePoints[i].X);
biggestY = Math.Max(biggestY, imagePoints[i].Y);
smallestY = Math.Min(smallestY, imagePoints[i].Y);
}
System.Drawing.Rectangle rectCrop = new System.Drawing.Rectangle(smallestX, smallestY, biggestX - smallestX, biggestY - smallestY);
return rectCrop;
}
public static Mat BitmapToMat(Bitmap bitmap)
{
Mat tmp, tmp2;
System.Drawing.Rectangle bRect = new System.Drawing.Rectangle(new System.Drawing.Point(0, 0), new System.Drawing.Size((int)bitmap.Width, (int)bitmap.Height));
BitmapData bmData = bitmap.LockBits(bRect, ImageLockMode.ReadWrite, bitmap.PixelFormat);
tmp2 = new Mat(new OpenCvSharp.Size(bitmap.Width, bitmap.Height), MatType.CV_8U);
tmp = new Mat(bitmap.Height, bitmap.Width, MatType.CV_8UC3, bmData.Scan0);
bitmap.UnlockBits(bmData);
return tmp;
}
“IplImage” ist the old image container from OpenCv 1. As Andreas already mentioned, today you should use “Mat” instead. Have also a look here : Difference between cvMat, Mat and IpImage
Unfortunately, your code sample is not complete, hence I corrected the two methods from the original project ( https://www.codeproject.com/Articles/703519/Cropping-Particular-Region-In-Image-Using-Csharp).
The following methods are tested and work as intended in the original project in combination with the latest OpenCVSharp version (v4.x) . It should be very simple now to convert the changes to your code.
public static Mat BitmapToIplImage(Bitmap bitmap)
{
Mat tmp, tmp2;
Rectangle bRect = new Rectangle(new System.Drawing.Point(0, 0), new System.Drawing.Size((int)bitmap.Width, (int)bitmap.Height));
BitmapData bmData = bitmap.LockBits(bRect, ImageLockMode.ReadWrite, bitmap.PixelFormat);
tmp2 = new Mat(new Size(bitmap.Width, bitmap.Height), MatType.CV_8U);
tmp = new Mat(bitmap.Height, bitmap.Width, MatType.CV_8UC3, bmData.Scan0);
bitmap.UnlockBits(bmData);
return tmp;
}
private void crop()
{
timer1.Stop();
Graphics Ga = Graphics.FromImage(bmp);
//the black image
Ga.FillRectangle(new SolidBrush(Color.Black), new Rectangle(0, 0, bmp.Width, bmp.Height));
//draw from the last point to first point
Ga.DrawLine(new Pen(Color.Red, 3), polygonPoints[polygonPoints.Count - 1], polygonPoints[0]);
//all of the rgb values are being set 1 inside the polygon
SolidBrush Brush = new SolidBrush(Color.FromArgb(1, 1, 1));
//we have to prepare one mask of Multiplying operation for cropping region
G.FillClosedCurve(Brush, polygonPoints.ToArray());
var accc= (BitmapToIplImage(Source).Mul(BitmapToIplImage(bmp))).ToMat();
computecrop();
croplast = accc.ToBitmap().Clone(rectcrop, Source.PixelFormat);//just show cropped region part of image
pictureBox2.Image = croplast; // crop region of image
}
I'm creatin a Code39 barcode image with C# and I need to add margin to this image.
This is the first image which I created.
I created it.
But it should be like this.
It should be like this.
The code is complicated.
This code is creating barcode bars, number and title strings.
public byte[] Code39(string code, int barSize, bool showCodeString, string title, string fontFile)
{
// Create stream....
MemoryStream ms = new MemoryStream();
FontFamilyName = "Free 3 of 9";//ConfigurationSettings.AppSettings["BarCodeFontFamily"];
FontFileName = fontFile;//#"C:\Documents and Settings\narottam.sharma\Desktop\Barcode\WSBarCode\Code39Font\FREE3OF9.TTF";// ConfigurationSettings.AppSettings["BarCodeFontFile"];
FontSize = barSize;
ShowCodeString = showCodeString;
if (title + "" != "")
Title = title;
Bitmap objBitmap = GenerateBarcode(code);
objBitmap.Save(ms, ImageFormat.Png);
//return bytes....
return ms.GetBuffer();
}
public Bitmap GenerateBarcode(string barCode)
{
int bcodeWidth = 0;
int bcodeHeight = 0;
// Get the image container...
Bitmap bcodeBitmap = CreateImageContainer(barCode, ref bcodeWidth, ref bcodeHeight);
Graphics objGraphics = Graphics.FromImage(bcodeBitmap);
// Fill the background
objGraphics.FillRectangle(new SolidBrush(Color.White), new Rectangle(0, 0, bcodeWidth, bcodeHeight));
int vpos = 0;
// Draw the title string
if (_titleString != null)
{
objGraphics.DrawString(_titleString, _titleFont, new SolidBrush(Color.Black), XCentered((int)_titleSize.Width, bcodeWidth), vpos);
vpos += (((int)_titleSize.Height) + _itemSepHeight);
}
// Draw the barcode
objGraphics.DrawString(barCode, Code39Font, new SolidBrush(Color.Black), XCentered((int)_barCodeSize.Width, bcodeWidth), vpos);
// Draw the barcode string
if (_showCodeString)
{
vpos += (((int)_barCodeSize.Height));
objGraphics.DrawString(barCode, _codeStringFont, new SolidBrush(Color.Black), XCentered((int)_codeStringSize.Width, bcodeWidth), vpos);
}
// return the image...
return bcodeBitmap;
}
private Bitmap CreateImageContainer(string barCode, ref int bcodeWidth, ref int bcodeHeight)
{
Graphics objGraphics;
// Create a temporary bitmap...
Bitmap tmpBitmap = new Bitmap(1, 1, PixelFormat.Format32bppArgb);
objGraphics = Graphics.FromImage(tmpBitmap);
// calculate size of the barcode items...
if (_titleString != null)
{
_titleSize = objGraphics.MeasureString(_titleString, _titleFont);
bcodeWidth = (int)_titleSize.Width;
bcodeHeight = (int)_titleSize.Height + _itemSepHeight;
}
_barCodeSize = objGraphics.MeasureString(barCode, Code39Font);
bcodeWidth = Max(bcodeWidth, (int)_barCodeSize.Width);
bcodeHeight += (int)_barCodeSize.Height;
if (_showCodeString)
{
_codeStringSize = objGraphics.MeasureString(barCode, _codeStringFont);
bcodeWidth = Max(bcodeWidth, (int)_codeStringSize.Width);
bcodeHeight += (_itemSepHeight + (int)_codeStringSize.Height);
}
// dispose temporary objects...
objGraphics.Dispose();
tmpBitmap.Dispose();
return (new Bitmap(bcodeWidth, bcodeHeight, PixelFormat.Format32bppArgb));
}
You can modify the objGraphics.FillRectangle(new SolidBrush(Color.White), new Rectangle(0, 0, bcodeWidth, bcodeHeight)); call from GenerateBarcode and make the width greater.
var margin = VALUE NEEDED;
objGraphics.FillRectangle(new SolidBrush(Color.White), new Rectangle(margin, 0, bcodeWidth + margin, bcodeHeight));
// Draw additiona text to the left
objGraphics.DrawString(ADDITIONAL_TEXT, _titleFont, new SolidBrush(Color.Black), new RectangleF(0, 0, margin, bcodeHeight)); //you can modify the rectangle area as needed
DrawImage method of Graphics class is not creating high quality images. In this method I am splitting a master image into multiple image but the code generating first image in very low quality. But it is generating full black images for remaining height.
public static Bitmap[] Split(byte[] ByteImage)
{
// MasterImage: there is no problem in master image. it is saving it in good quality.
MemoryStream ms = new MemoryStream(ByteImage);
System.Drawing.Image MasterImage = System.Drawing.Image.FromStream(ms);
MasterImage.Save(HttpContext.Current.Server.MapPath("../../../App_Shared/Reports/Temp/MasterImage.Bmp"), ImageFormat.Bmp);
//Split master image into multiple image according to height / 1000
Int32 ImageHeight = 1000, ImageWidth = MasterImage.Width, MasterImageHeight = MasterImage.Height;
int PageCount = 0;
Int32 TotalPages = MasterImage.Height / 1000;
Bitmap[] imgs = new Bitmap[TotalPages];
for (int y = 0; y + 1000 < MasterImageHeight; y += 1000, PageCount++)
{
imgs[PageCount] = new Bitmap(ImageWidth, ImageHeight, PixelFormat.Format32bppPArgb);
using (Graphics gr = Graphics.FromImage(imgs[PageCount]))
{
gr.CompositingQuality = CompositingQuality.HighQuality;
gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
gr.SmoothingMode = SmoothingMode.HighQuality;
//First image now working with this code line
gr.DrawImage(MasterImage, new System.Drawing.Rectangle(0, y, ImageWidth, ImageHeight),new System.Drawing.Rectangle(0, 0, ImageWidth, ImageHeight), GraphicsUnit.Pixel); //new System.Drawing.Rectangle(new Point(0, y), new Size(ImageWidth, ImageHeight)));
//gr.DrawImage(MasterImage, new System.Drawing.Rectangle(0, y, ImageWidth, ImageHeight)); //new System.Drawing.Rectangle(new Point(0, y), new Size(ImageWidth, ImageHeight)));
string FilePath = HttpContext.Current.Server.MapPath("../../../App_Shared/Reports/Temp/Image" + PageCount.ToString() + ".bmp");
imgs[PageCount].Save(FilePath, System.Drawing.Imaging.ImageFormat.Bmp);
//Here it is saving images. I got first image with very poor quality but remaining in total balck color.
gr.Dispose();
}
}
return imgs;
}
As #HansPassant mentioned the source and target rectangle are reversed.
You could also change the structure of your splitting a bit so it could work a bit more flexible, and it might have a better readability at a later time.
class Program
{
static IList<Bitmap> SplitImage(Bitmap sourceBitmap, int splitHeight)
{
Size dimension = sourceBitmap.Size;
Rectangle sourceRectangle = new Rectangle(0, 0, dimension.Width, splitHeight);
Rectangle targetRectangle = new Rectangle(0, 0, dimension.Width, splitHeight);
IList<Bitmap> results = new List<Bitmap>();
while (sourceRectangle.Top < dimension.Height)
{
Bitmap pageBitmap = new Bitmap(targetRectangle.Size.Width, sourceRectangle.Bottom < dimension.Height ?
targetRectangle.Size.Height
:
dimension.Height - sourceRectangle.Top, PixelFormat.Format32bppArgb);
using (Graphics g = Graphics.FromImage(pageBitmap))
{
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBilinear;
g.DrawImage(sourceBitmap, targetRectangle, sourceRectangle, GraphicsUnit.Pixel);
}
sourceRectangle.Y += sourceRectangle.Height;
results.Add(pageBitmap);
}
return results;
}
static void Main(string[] args)
{
string sourceFilename = Environment.CurrentDirectory + #"\testimage.jpg";
Bitmap sourceBitmap = (Bitmap)Image.FromFile(sourceFilename);
var images = SplitImage(sourceBitmap, 79);
int len = images.Count;
for (int x = len; --x >= 0; )
{
var bmp = images[x];
string filename = "Images-" + x + ".bmp";
bmp.Save(Environment.CurrentDirectory + #"\" + filename, ImageFormat.Bmp);
images.RemoveAt(x);
bmp.Dispose();
Console.WriteLine("Saved " + filename);
}
Console.WriteLine("Done with the resizing");
}
}
This would also dynamically size the last image in case the page is less than your specified bitmap height at the end :)
I am having trouble wrapping my head around this and wanted some input on this. So I am reading in a scanned PDF document that has a QR code in it which is always located on the top left corner of the document.
Due to the fact that scanning files might change the orientation of the document I am checking the top left corner of the document to see if it has the QR code and if not I will rotate the document and check the left corner again. Purpose of this because in the QR code is on the left top corner then the document is in proper format for my requirements.
How could I change my following code so that it gets the document checks for a QR code - if not found rotate the whole document check again and continue until the QR code has been found. Also should I just rotate by 90 in a loop rather than 90 - 180 - 270.
using (var fullImg = new Bitmap(workGif))
{
var bandImg = fullImg.Clone(new System.Drawing.Rectangle(0, 0, 375, 375), fullImg.PixelFormat);
Bitmap result = fullImg;
if (Process(bandImg) == null)
{
fullImg.RotateFlip(RotateFlipType.Rotate270FlipNone);
bandImg = fullImg.Clone(new System.Drawing.Rectangle(0, 0, result.Width, result.Height), fullImg.PixelFormat);
if (Process(bandImg) == null)
{
fullImg.RotateFlip(RotateFlipType.Rotate90FlipNone);
bandImg = fullImg.Clone(new System.Drawing.Rectangle(0, 0, result.Width, result.Height), fullImg.PixelFormat);
if (Process(bandImg) == null)
{
fullImg.RotateFlip(RotateFlipType.Rotate180FlipNone);
bandImg = fullImg.Clone(new System.Drawing.Rectangle(0, 0, result.Width, result.Height), fullImg.PixelFormat);
}
}
}
bandImg.Save(#"C:\NewImageTest.png");
string QRinfo = Process(bandImg);
MessageBox.Show(QRinfo);
}
Process Method
I pass the image in this method to check and see if there is a QR code to be read.
public string Process(Bitmap bitmap)
{
var reader = new com.google.zxing.qrcode.QRCodeReader();
try
{
LuminanceSource source = new RGBLuminanceSource(bitmap, bitmap.Width, bitmap.Height);
var binarizer = new HybridBinarizer(source);
var binBitmap = new BinaryBitmap(binarizer);
return reader.decode(binBitmap).Text;
}
catch (Exception e)
{
return null;
}
}
Woudn't something like this work for you? There are only four possible orientations of the document, so you have to loop at most four times. Each loop you rotate the image by 90 degrees. Once you've established that the QR code is in the top-left corner, you can break out of the loop. Then you can process the QR code or do whatever you want with it.
public void Do(string workGif)
{
// ...
string qrInfo;
using (var fullImg = new Bitmap(workGif))
{
for (int i = 0; i < 4; i++)
{
// Does the image contain a QR code?
qrInfo = Process(fullImg);
if (qrInfo = null)
// No QR code found. Rotate the image.
fullImg.RotateFlip(RotateFlipType.Rotate90FlipNone);
else
// QR code found. Break out of the loop.
break;
}
if (qrInfo == null)
{
throw new InvalidOperationException(
"The document contains no QR code.");
}
}
MessageBox.Show(qrInfo);
// ...
}
You can move the code that takes the corner image of the source image to the Process method.
private Image GetCornerImage(Image sourceImage)
{
return sourceImage.Clone(new Rectangle(0, 0, 375, 375), sourceImage.PixelFormat);
}
public string Process(Bitmap bitmap)
{
var cornerImg = GetCornerImage(bitmap);
var reader = new com.google.zxing.qrcode.QRCodeReader();
LuminanceSource source = new RGBLuminanceSource(
cornerImg, cornerImg.Width, cornerImg.Height);
var binarizer = new HybridBinarizer(source);
var binBitmap = new BinaryBitmap(binarizer);
return reader.decode(binBitmap).Text;
}
This should work fine ;
using (var fullImg = new Bitmap(workGif))
{
var bandImg = fullImg.Clone(new System.Drawing.Rectangle(0, 0, 375, 375), fullImg.PixelFormat);
int i = 0;
while(Process(bandImg) == null)
{
if (i == 1)
fullImg.RotateFlip(RotateFlipType.Rotate270FlipNone);
else if (i == 2)
fullImg.RotateFlip(RotateFlipType.Rotate90FlipNone);
else if (i== 3)
fullImg.RotateFlip(RotateFlipType.Rotate180FlipNone);
/*
Another way in which Rotation Degree can be done
First time it rotate by 270, then by 180 & then by 90
int i must be initialized with 1
int degree_to_rotate = 360 - ((4 - i) * 90)
*/
bandImg = fullImg.Clone(new System.Drawing.Rectangle(0, 0, result.Width, result.Height), fullImg.PixelFormat);
i++;
}
bandImg.Save(#"C:\NewImageTest.png");
string QRinfo = Process(bandImg);
MessageBox.Show(QRinfo);
}
If you are doing the same checks in every rotation, there is no reason not to use a loop. Just make sure you keep track of the number of rotations performed or you will be stuck in an infinite loop.
My code:
private void CreateAnimatedGif(List<string> GifsFilesRadar , List<string> GifsFilesSatellite)//string FileName1 , string FileName2)
{
Bitmap bitmap = null;
DirectoryInfo inf = new DirectoryInfo(tempGifFiles);
FileInfo[] fi = inf.GetFiles("*.gif");
for (int i = 0; i < fi.Length; i++)
{
Bitmap file1 = new Bitmap(GifsFilesRadar[i]);
Bitmap file2 = new Bitmap(GifsFilesSatellite[i]);
//calculate the new width proportionally to the new height it will have
int newWidth = file1.Width + file1.Width / (file2.Height / (file2.Height - file1.Height));
bitmap = new Bitmap(newWidth + file2.Width, Math.Max(file1.Height, file2.Height));
using (Graphics g = Graphics.FromImage(bitmap))
{
//high quality rendering and interpolation mode
g.SmoothingMode = SmoothingMode.HighQuality;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
//resize the left image
g.DrawImage(file1, new Rectangle(0, 0, newWidth, file2.Height));
g.DrawImage(file2, newWidth, 0);
string t = #"d:\GifsForAnimations" + "\\" + i.ToString("D6") + ".Gif";
bitmap.Save(t, System.Drawing.Imaging.ImageFormat.Gif);
if (i == 4)
{
break;
}
}
}
List<string> gif = new List<string>();
DirectoryInfo info = new DirectoryInfo(#"d:\GifsForAnimations");
FileInfo[] finfo = info.GetFiles();
for (int i = 0; i < finfo.Length; i++)
{
gif.Add(finfo[i].FullName);
}
newFile.MakeGIF(gif, #"d:\newGifAnim.gif", 80, true);
}
In the end I have new animated gif file.
Now I have the border and these are the locations:
Bottom left corner: 232.0,408.0
Top left corner: 232.0,211.0
Top right corner: 524.0,211.0
Bottom right corner: 524.0,408.0
I want to add on each image a frame around it to mark the border around. Let's say the border will be in Red and the border line size will be 5 pixels.
How can I create the rectangle around existing bitmap or gif file ?
It doesn't have to be connected to my example code here but how do I create the frame/border around the image with the locations I have ?
You could add this line after g.DrawImage(file2, newWidth, 0);
g.DrawRectangle(new Pen(Brushes.Red, 5), new Rectangle(0, 0, newWidth, file2.Height));
Here is a small test method so you can see it working
private void button1_Click(object sender, EventArgs e)
{
Bitmap bitmap = new Bitmap(#"C:\avatar63.jpg");
using (Graphics g = Graphics.FromImage(bitmap))
{
g.DrawRectangle(new Pen(Brushes.Red, 5), new Rectangle(0, 0, bitmap.Width, bitmap.Height));
}
bitmap.Save(#"C:\avatar63New.jpg");
}
Before: After:
You can add the rectagle anywhere you want, tou jst need to supply the X,Y,Width,Height
g.DrawRectangle(new Pen(Brushes.LimeGreen, 5), new Rectangle(50, 50, 100, 100));
Using your 4 point structure this should work
Point topLeft = new Point(232,211 );
Point topRightr = new Point(232, 408);
Point bottomLeft = new Point(524, 211);
Point bottomRight = new Point(524, 408);
g.DrawRectangle(new Pen(Brushes.LimeGreen, 5), new Rectangle(topLeft, new Size(topRightr.X - topLeft.X, bottomLeft.Y - topLeft.Y)));
// TopLeft = rectangle location
// TopRight.X - TopLeft.X = Width of rectangle
// BottomLeft.Y - TopLeft.Y = height of rectangle