Resizing an image programmatically in C #

Question

Possible duplicate:
Resize C # Image

How can I programmatically resize an image in C # to fit the winforms control?

Answer 1

Image scaling in PictureBox:

class ImageHandling { public static Rectangle GetScaledRectangle(Image img, Rectangle thumbRect) { if (img.Width < thumbRect.Width && img.Height < thumbRect.Height) return new Rectangle(thumbRect.X + ((thumbRect.Width - img.Width) / 2), thumbRect.Y + ((thumbRect.Height - img.Height) / 2), img.Width, img.Height); int sourceWidth = img.Width; int sourceHeight = img.Height; float nPercent = 0; float nPercentW = 0; float nPercentH = 0; nPercentW = ((float)thumbRect.Width / (float)sourceWidth); nPercentH = ((float)thumbRect.Height / (float)sourceHeight); if (nPercentH < nPercentW) nPercent = nPercentH; else nPercent = nPercentW; int destWidth = (int)(sourceWidth * nPercent); int destHeight = (int)(sourceHeight * nPercent); if (destWidth.Equals(0)) destWidth = 1; if (destHeight.Equals(0)) destHeight = 1; Rectangle retRect = new Rectangle(thumbRect.X, thumbRect.Y, destWidth, destHeight); if (retRect.Height < thumbRect.Height) retRect.Y = retRect.Y + Convert.ToInt32(((float)thumbRect.Height - (float)retRect.Height) / (float)2); if (retRect.Width < thumbRect.Width) retRect.X = retRect.X + Convert.ToInt32(((float)thumbRect.Width - (float)retRect.Width) / (float)2); return retRect; } public static Image GetResizedImage(Image img, Rectangle rect) { Bitmap b = new Bitmap(rect.Width, rect.Height); Graphics g = Graphics.FromImage((Image)b); g.InterpolationMode = InterpolationMode.HighQualityBicubic; g.DrawImage(img, 0, 0, rect.Width, rect.Height); g.Dispose(); try { return (Image)b.Clone(); } finally { b.Dispose(); b = null; g = null; } } } 

And how to use it:

 Image img = Image.FromFile(imageFilePath); Rectangle newRect = GetScaledRectangle(img, pictureBox1.ClientRectangle); pictureBox1.Image = ImageHandling.GetResizedImage(img, newRect); 

Answer 2

Sacle and ImageBox Center:

 private void LoadAndResizeImage(string sImagepath, int iMaxHeight, int iMaxWidth, int iMinX, int iMinY) { int wdt = iMaxWidth; int hgt = iMaxHeight; int partialX = iMinX; int partialY = iMinY; pictureBox1.ImageLocation = sImagepath; if ((pictureBox1.Image.Height > iMaxHeight) || (pictureBox1.Image.Width > iMaxWidth)) { if ((pictureBox1.Image.Width / iMaxWidth) > (pictureBox1.Image.Height / iMaxHeight)) { wdt = iMaxWidth; double ratio = (double)pictureBox1.Image.Height / (double)pictureBox1.Image.Width; hgt = (int)(iMaxWidth * ratio); } else { hgt = iMaxHeight; double ratio = (double)pictureBox1.Image.Width / (double)pictureBox1.Image.Height; wdt = (int)(iMaxHeight * ratio); } } else { hgt = pictureBox1.Image.Height; wdt = pictureBox1.Image.Width; } if (wdt < iMaxWidth) { partialX = (iMaxWidth - wdt) / 2; partialX += iMinX; } else { partialX = iMinX; } if (hgt < iMaxHeight) { partialY = (iMaxHeight - hgt) / 2; partialY += iMinY; } else { partialY = iMinY; } //Set size pictureBox1.Height = hgt; pictureBox1.Width = wdt; pictureBox1.Left = partialX; pictureBox1.Top = partialY; }