---
title: "skala ett Graphics-objekt."
type: "forum-thread"
url: "https://www.webforum.nu/amne/dotnet/100059-skala-ett-graphics-objekt"
topic: ".NET"
topic_url: "https://www.webforum.nu/amne/dotnet"
author: "icaaq"
published: "2004-03-22T12:31:10.000Z"
updated: "2004-03-22T15:25:30.000Z"
replies: 3
views: 250
page: 1
pages: 1
language: "sv-SE"
site: "webForum — webforum.nu"
rights: "Upphovsrätten till varje inlägg tillhör dess författare."
attribution: "Citera som: webForum, https://www.webforum.nu/amne/dotnet/100059-skala-ett-graphics-objekt"
---
# skala ett Graphics-objekt.
## #1 — icaaq, 2004-03-22T12:31Z
Hej.
Jag skapar en bild av denna kod.
```
[red]
PrivateFontCollection privateFont = new PrivateFontCollection();
privateFont.AddFontFile(@"F:\Inetpub\wwwroot\font\GOTHIC.TTF");
FontFamily fontFamily = privateFont.Families[0];
Font font = new Font(fontFamily, 32, (FontStyle.Regular) );
Bitmap objBitmap = new Bitmap(300, 100, PixelFormat.Format24bppRgb);
objBitmap.SetResolution(72, 72);
int width = objBitmap.Width, height = objBitmap.Height;
StringFormat stringFormat = new StringFormat();
stringFormat.Alignment = StringAlignment.Center;
stringFormat.LineAlignment = StringAlignment.Center;
Graphics objGraphics = Graphics.FromImage(objBitmap);
objGraphics.SmoothingMode = SmoothingMode.AntiAlias;
objGraphics.TextRenderingHint = TextRenderingHint.AntiAlias;
objGraphics.Clear(Color.White);
objGraphics.DrawRectangle(Pens.AliceBlue, 3, 3, width-1, height-1);
objGraphics.DrawString(Convert.ToString(HttpContext.Current.Request.QueryString["text"]), font, new SolidBrush(Color.Black),
new Rectangle(0, 0, width, height), stringFormat);
[b]
int newWidth, newHeight;
double ImageScale = (double)300 / (double)objBitmap.Width;
newWidth = Convert.ToInt32(objBitmap.Width * ImageScale);
newHeight = Convert.ToInt32(objBitmap.Height * ImageScale);
objGraphics.DrawImage(objBitmap ,new Rectangle(100, 0, newWidth, newHeight));[/b]
MemoryStream ms = new MemoryStream();
objBitmap.Save(ms, ImageFormat.Jpeg);
Byte[] Buffer = ms.ToArray();
HttpContext.Current.Response.BufferOutput = true;
try
{
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ClearHeaders();
HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache);
HttpContext.Current.Response.ContentType = "Image/jpeg";
HttpContext.Current.Response.AppendHeader("content-disposition", "inline");
HttpContext.Current.Response.OutputStream.Write(Buffer, 0, Buffer.Length);
}
catch( Exception ex )
{
//Debug.WriteLine(inputFileName);
throw(ex);
}
objGraphics.Dispose();
objBitmap.Dispose();
}
[/red]
```
Nu skulle jag vilja ha lite förslag på hur jag kan skala om bilden efter att jag lagt dit texten. Det är alltså den feta texten som inte fungerar, och som jag vill få exempel på :)
mv icaaq
Permalänk: https://www.webforum.nu/p/100059
## #2 — fredrik, 2004-03-22T15:08Z
Till att börja med....Vad blir fel nu?
Permalänk: https://www.webforum.nu/p/1305137
## #3 — icaaq, 2004-03-22T15:21Z
Felet var att jag inte kunde skala bilden. Detta löste jag på detta vis.
```
[red]
using System;
using System.Web;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using NineteenDecember;
namespace NineteenDecember.HttpHandler
{
///
/// Summary description for viewimage.
///
public class GenerateTextImage: IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
// Sets the Culture to Swedish
CultureInfo info = new CultureInfo("sv-SE", false);
// Create a memoryStream, more on that later
MemoryStream ms = new MemoryStream();
// Sets the orginal size of the bitmap
int width = 230;
int height = 60;
// Creates the original bitmap
Bitmap objBitmap = new Bitmap(width, height, PixelFormat.Format24bppRgb);
objBitmap.SetResolution(72, 72);
// Sets the default font
string fontName = "Arial.TTF";
// Checks if a specified font is posted
if(HttpContext.Current.Request.QueryString["fontName"] != null)
fontName = Convert.ToString(HttpContext.Current.Request.QueryString["fontName"]);
// Creates a PrivateFontCollection
PrivateFontCollection privateFont = new PrivateFontCollection();
// Add the fontFile to the collection and creates a new font object.
privateFont.AddFontFile(HttpContext.Current.Server.MapPath("/font")+"/"+fontName);
FontFamily fontFamily = privateFont.Families[0];
Font font = new Font(fontFamily, 32, (FontStyle.Regular));
// Center the text
StringFormat stringFormat = new StringFormat();
stringFormat.Alignment = StringAlignment.Center;
stringFormat.LineAlignment = StringAlignment.Center;
// Create the Grapichs
Graphics objGraphics = Graphics.FromImage(objBitmap);
objGraphics.SmoothingMode = SmoothingMode.AntiAlias;
objGraphics.TextRenderingHint = TextRenderingHint.AntiAlias;
objGraphics.Clear(Color.White);
// Write the Text
objGraphics.DrawString(Convert.ToString(HttpContext.Current.Request.QueryString["text"], info), font, new SolidBrush(Color.Black),
new Rectangle(0, 0, width, height), stringFormat);
[b] if(HttpContext.Current.Request.QueryString["width"] != null)
{
// Calculate the scale
double ImageScale = Convert.ToDouble(HttpContext.Current.Request.QueryString["width"]) / (double)objBitmap.Width;
int newWidth = Convert.ToInt32(objBitmap.Width * ImageScale);
int newHeight = Convert.ToInt32(objBitmap.Height * ImageScale);
// Create a new bitmap with the scaled size
Bitmap final = null;
final = new Bitmap(newWidth, newHeight);
// Create the Grapichs for the scaled version
Graphics g = Graphics.FromImage(final);
g.CompositingMode = CompositingMode.SourceCopy;
g.Clear(Color.White);
g.InterpolationMode = InterpolationMode.High;
g.DrawImage(objBitmap,new Rectangle(0, 0, newWidth, newHeight),new Rectangle(0, 0, width, height), GraphicsUnit.Pixel);
// Saves the scaled version to the memoryStream
final.Save(ms, ImageFormat.Jpeg);
}[/b]
else
{
objBitmap.Save(ms, ImageFormat.Jpeg);
}
Byte[] Buffer = ms.ToArray();
HttpContext.Current.Response.BufferOutput = true;
try
{
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ClearHeaders();
HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache);
HttpContext.Current.Response.ContentType = "Image/jpeg";
HttpContext.Current.Response.AppendHeader("content-disposition", "inline");
HttpContext.Current.Response.OutputStream.Write(Buffer, 0, Buffer.Length);
}
catch( Exception ex )
{
//Debug.WriteLine(inputFileName);
throw(ex);
}
objGraphics.Dispose();
objBitmap.Dispose();
}
public bool IsReusable
{
get
{
return true;
}
}
}
}
[/red]
```
mv icaaq
Permalänk: https://www.webforum.nu/p/1305152
## #4 — icaaq, 2004-03-22T15:25Z
Ni kan se ett exempel här
mv icaaq
Permalänk: https://www.webforum.nu/p/1305156
---
Tråden på webben: https://www.webforum.nu/amne/dotnet/100059-skala-ett-graphics-objekt