I want to draw a image using using C# graphics class using provided X,Y coordinates and zoom Value. I tried to do this but it is not giving me the correct result.
Stream originalStream = ImageHelper.UrlToImageStream(list1.FirstOrDefault().OriginalImageUrl);
var bmp = new Bitmap(bmp.Width, bmp.Height);
int width = 0;
int height = 0;
var img = new Bitmap(bmp,
(int)(bmp.Size.Width / zoomLevel),
(int)(bmp.Size.Height / zoomLevel));
var g = Graphics.FromImage(bmp);
g.SmoothingMode = SmoothingMode.AntiAlias;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.DrawString(Text, SystemFonts.DefaultFont, Brushes.White, new Rectangle((int)CurrentTextX, (int)CurrentTextY, bmp.Width, bmp.Height));
g.DrawImage(img, new Rectangle((int)CurrentX, (int)CurrentY, bmp.Width, bmp.Height));
var stream = new System.IO.MemoryStream();
img.Save(stream, ImageFormat.Jpeg);
private void mapPaint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
Image img = Image.FromFile(#"C:\img.png");
g.DrawImage(img, new Rectangle(10,10,img.Width/zoomLevel, img.Height/zoomLevel);
}
Try it like this also what is the incorrect result you are getting right now?
Related
I am currently creating an app which will let you upload some images and then resize them (100x180) and put a 200x200 white background on them.
I've figured on how to resize the images + create the white background but I cannot figure out how to put them together.
Here is the code for resizing and the white background:
public static Bitmap ResizeImage(Image image, int width, int height)
{
var destRect = new Rectangle(0, 0, width, height);
var destImage = new Bitmap(width, height);
destImage.SetResolution(image.HorizontalResolution, image.VerticalResolution);
using (var graphics = Graphics.FromImage(destImage))
{
graphics.CompositingMode = CompositingMode.SourceCopy;
graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
using (var wrapMode = new ImageAttributes())
{
wrapMode.SetWrapMode(WrapMode.TileFlipXY);
graphics.DrawImage(image, destRect, 0, 0, image.Width, image.Height, GraphicsUnit.Pixel, wrapMode);
}
}
return destImage;
}
private Bitmap DrawFilledRectangle(int x, int y)
{
Bitmap bmp = new Bitmap(x, y);
using (Graphics graph = Graphics.FromImage(bmp))
{
Rectangle ImageSize = new Rectangle(0, 0, x, y);
graph.FillRectangle(Brushes.White, ImageSize);
}
return bmp;
}
Expected result:
Thank you all in advance!
Using AForge.Video.FFMPEG I am able to create video from Images.
string[] files;
string folderPath = #"FolderPath";
files = Directory.GetFiles(folderPath).OrderBy(c => c).ToArray();
VideoFileWriter writer = new VideoFileWriter();
writer.Open(#"C:folder\new.mp4", imageWidth, imageHeight, 10, VideoCodec.MPEG4);
for (int j = 0; j < files.Length; j++)
{
string fileName = files[j];
BitmapSource imageBitMap = new BitmapImage(new Uri(fileName, UriKind.RelativeOrAbsolute));
imageBitMap.Freeze();
int stride = imageBitMap.PixelWidth * ((imageBitMap.Format.BitsPerPixel + 7) / 8);
byte[] ImageInBits = new byte[imageBitMap.PixelWidth * imageBitMap.PixelHeight];
imageBitMap.CopyPixels(ImageInBits, stride, 0);
Bitmap image = new Bitmap(imageWidth, imageHeight, stride, PixelFormat.Format8bppIndexed, Marshal.UnsafeAddrOfPinnedArrayElement(ImageInBits, 0));
writer.WriteVideoFrame(image);
image.Dispose();
}
I am trying to add text/String to input image using
private Bitmap WriteString(Bitmap bmp)
{
RectangleF rectf = new RectangleF(70, 90, 90, 50);
Bitmap tempBitmap = new Bitmap(bmp.Width, bmp.Height);
Graphics g = Graphics.FromImage(tempBitmap);
g.DrawImage(bmp, 0, 0);
g.SmoothingMode = SmoothingMode.AntiAlias;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.DrawString("yourText", new Font("Tahoma", 8), Brushes.Red, rectf);
g.Flush();
return bmp;
}
like
Bitmap image = new Bitmap(imageWidth, imageHeight, stride, PixelFormat.Format8bppIndexed, Marshal.UnsafeAddrOfPinnedArrayElement(ImageInBits, 0));
Bitmap outputBitmap=WriteString(image);
writer.WriteVideoFrame(outputBitmap);
How can I write a string to Image?
Is there any way to add subtitle to AForge.Video.FFMEG to image before creating video?
private Bitmap WriteString(Bitmap bmp) {
Bitmap tempBitmap = new Bitmap(bmp.Width, bmp.Height); << create new
..draw on copy..
return bmp; <<< return original
}
Seems to be the wrong.
This question already has answers here:
Free c# QR-Code generator [closed]
(4 answers)
Closed 7 years ago.
After using this lines of code bellow
private void button1_Click(object sender, EventArgs e)
{
string barcode = textBox1.Text;
Bitmap bitmap = new Bitmap(barcode.Length * 40, 150);
using (Graphics graphics = Graphics.FromImage(bitmap))
{
Font oFont = new System.Drawing.Font("IDAutomationHC39M", 20);
PointF point = new PointF(2f, 2f);
SolidBrush white = new SolidBrush(Color.White);
SolidBrush black = new SolidBrush(Color.Black);
graphics.FillRectangle(white,0,0,bitmap.Width,bitmap.Height);
graphics.DrawString("*" + barcode + "*", oFont, black, point);
}
using (MemoryStream ms = new MemoryStream())
{
bitmap.Save(ms,ImageFormat.Png);
pictureBox1.Image = bitmap;
pictureBox1.Height = bitmap.Height;
pictureBox1.Width = bitmap.Width;
}
}
i was able to generate this output image barcode
i want to generate a bar code that output like the image bellow how can i achieve this
You can do it like this
private System.Drawing.Image GenerateQRCode(string content, int size)
{
QrEncoder encoder = new QrEncoder(ErrorCorrectionLevel.H);
QrCode qrCode;
encoder.TryEncode(content, out qrCode);
GraphicsRenderer gRenderer = new GraphicsRenderer(new FixedModuleSize(4, QuietZoneModules.Two), System.Drawing.Brushes.Black, System.Drawing.Brushes.White);
//Graphics g = gRenderer.Draw(qrCode.Matrix);
MemoryStream ms = new MemoryStream();
gRenderer.WriteToStream(qrCode.Matrix, ImageFormat.Bmp, ms);
var imageTemp = new Bitmap(ms);
var image = new Bitmap(imageTemp, new System.Drawing.Size(new System.Drawing.Point(size, size)));
//image.Save("file.bmp", ImageFormat.Bmp);
return (System.Drawing.Image)image;
}
Implementaion
string barcode = textBox1.Text;
codeImage = GenerateQRCode(barcode, 120);
// you can make a smaller image as per your need
rect = new System.Drawing.Rectangle(1080, 530, codeImage.Width, codeImage.Height);
using (Graphics g = Graphics.FromImage(picEdit))
{
g.SmoothingMode = SmoothingMode.AntiAlias;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.DrawImage(codeImage, rect);
}
Do not forget to add
using Gma.QrCodeNet.Encoding;
using Gma.QrCodeNet.Encoding.Windows.Render;
from GitHub: QrCode.Net
im trying to save an image after changing its opacity here is my code:
protected void bntChangeOpacity_Click(object sender, EventArgs e) {
String saveDir = mydir;
Image watermarkImage = Image.FromFile(Server.MapPath(mydir + "imgname.jpg"));
Graphics gr = Graphics.FromImage(watermarkImage);
Rectangle r2 = new Rectangle(new Point(0, 0), new Size(watermarkImage.Width, watermarkImage.Height));
float opacityvalue = 0.5f;
ImageUtils.ImageTransparency.ChangeOpacity(watermarkImage, opacityvalue);
Bitmap b1 = new Bitmap(watermarkImage.Width, watermarkImage.Height);
gr.DrawImage(watermarkImage, r2);
b1.Save(Server.MapPath(saveDir + "sasf.jpg"));
}
the class code is:
public class ImageTransparency {
public static Bitmap ChangeOpacity(Image img, float opacityvalue)
{
Bitmap bmp = new Bitmap(img.Width,img.Height);
Graphics graphics = Graphics.FromImage(bmp);
ColorMatrix colormatrix = new ColorMatrix();
colormatrix.Matrix33 = opacityvalue;
ImageAttributes imgAttribute = new ImageAttributes();
imgAttribute.SetColorMatrix(colormatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
graphics.DrawImage(img, new Rectangle(0, 0, bmp.Width, bmp.Height), 0, 0, img.Width, img.Height, GraphicsUnit.Pixel, imgAttribute);
graphics.Dispose();
return bmp;
}
}
whats the problem ?? please help
You can do it this way:
private void button1_Click(object sender, EventArgs e)
{
float opacityvalue = 0.5f;
var img= ImageTransparency.ChangeOpacity(Image.FromFile(#"PathToYourImage.png"), opacityvalue);
img.Save(#"PathToYourImage-Opacity.png");
}
class ImageTransparency
{
public static Bitmap ChangeOpacity(Image img, float opacityvalue)
{
Bitmap bmp = new Bitmap(img.Width,img.Height); // Determining Width and Height of Source Image
Graphics graphics = Graphics.FromImage(bmp);
ColorMatrix colormatrix = new ColorMatrix();
colormatrix.Matrix33 = opacityvalue;
ImageAttributes imgAttribute = new ImageAttributes();
imgAttribute.SetColorMatrix(colormatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
graphics.DrawImage(img, new Rectangle(0, 0, bmp.Width, bmp.Height), 0, 0, img.Width, img.Height, GraphicsUnit.Pixel, imgAttribute);
graphics.Dispose(); // Releasing all resource used by graphics
return bmp;
}
}
Based on Change Opacity of Image in C#
I have the function below to generate a sample logo. What I want to do is to return a transparent png or gif instead of a white background.
How can I do that?
private Bitmap CreateLogo(string subdomain)
{
Bitmap objBmpImage = new Bitmap(1, 1);
int intWidth = 0;
int intHeight = 0;
Font objFont = new Font(
"Arial",
13,
System.Drawing.FontStyle.Bold,
System.Drawing.GraphicsUnit.Pixel);
Graphics objGraphics = Graphics.FromImage(objBmpImage);
intWidth = (int)objGraphics.MeasureString(subdomain, objFont).Width;
intHeight = (int)objGraphics.MeasureString(subdomain, objFont).Height;
objBmpImage = new Bitmap(objBmpImage, new Size(intWidth, intHeight));
objGraphics = Graphics.FromImage(objBmpImage);
objGraphics.Clear(Color.White);
objGraphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
objGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
objGraphics.DrawString(
subdomain, objFont,
new SolidBrush(Color.FromArgb(102, 102, 102)), 0, 0);
objGraphics.Flush();
return (objBmpImage);
}
Here is the end result:
context.Response.ContentType = "image/png";
using (MemoryStream memStream = new MemoryStream())
{
CreateLogo(_subdname).Save(memStream, ImageFormat.Png);
memStream.WriteTo(context.Response.OutputStream);
}
In the CreateLogo function:
objGraphics.Clear(Color.White) was changed to objGraphics.Clear(Color.Transparent)
new SolidBrush(Color.FromArgb(102, 102, 102)) changed to new SolidBrush(Color.FromArgb(255, 255, 255))
You can do something like this:
Bitmap bmp = new Bitmap(300, 300);
Graphics g = Graphics.FromImage(bmp);
g.Clear(Color.Transparent);
g.FillRectangle(Brushes.Red, 100, 100, 100, 100);
g.Flush();
bmp.Save("test.png", System.Drawing.Imaging.ImageFormat.Png);
Take a look at Can you make an alpha transparent PNG with C#?