Solved

How do I set the size for Graphics DrawString

Posted on 2009-05-15
3
2,424 Views
Last Modified: 2013-12-17
Refer to code snippet. The Bitmap Size is set as follows:  Bitmap(500, 50);
The string I am drawing is DateTime.Now.ToShortTimeString()
I want to auto-resize my bitmap canvas/imagesize to allow for the actual lentgh of my string.
If I replace DateTime.Now.ToShortTimeString() with VeryLongTextString (unknown length)
eg. g.DrawString(VeryLongTextString, new Font("Arial", 32), Brushes.Red, new PointF(0, 0));
How do I Get around the limitations set by Bitmap(500, 50);
I don't want to necessarily resize or stretch the image, but instead change the canvas or image size to match the "content"
Bitmap bmp = new Bitmap(500, 50);
Graphics g = Graphics.FromImage(bmp);
g.FillRectangle(Brushes.White, 0, 0, 500, 50);
g.DrawString(DateTime.Now.ToShortTimeString(), new Font("Arial", 32), Brushes.Red, new PointF(0, 0));

Open in new window

0
Comment
Question by:andrejonker
  • 2
3 Comments
 
LVL 9

Accepted Solution

by:
tculler earned 200 total points
ID: 24397590
You can use g.MeasureString(String, Font). This returns a SizeF object (a Size with float dimensions instead of integer). Just remember that you need to store the String beforehand; otherwise, two consecutive calls to DateTime.Now.ToShortTimeString() will yield differetn results. Here's an example, expanding on your code, presented in the following code snippet.

Hope it helps,
Nate
System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(500, 50);
System.Drawing.Graphics gfx = System.Drawing.Graphics.FromImage(bmp);
 
System.String shortDate = System.DateTime.Now.ToShortDateTimeString();
System.Drawing.Font drawFont = new System.Drawing.Font("Arial", 32F);
 
gfx.Clear(System.Drawing.Color.White); // This fills the whole bitmap with white, instead of manualy filling a rectangle
gfx.DrawString(shortDate, drawFont, System.Drawing.Brushes.Red, new System.Drawing.PointF(0f, 0f));
System.Drawing.SizeF dateSize = gfx.MeasureString(shortDate, drawFont);

Open in new window

0
 
LVL 5

Assisted Solution

by:gazzzzzzer
gazzzzzzer earned 300 total points
ID: 24404106
I agree that the MeasureString method provided by the Graphics Class should help you with your problem.

I have included an example to show how you could use this and increase the Canvas size as needed.
            Bitmap bmp = new Bitmap(500, 50);
            Graphics g = Graphics.FromImage(bmp);
            
            string shortDate = DateTime.Now.ToShortDateString();
            Font drawFont = new Font("Arial", 32F);
            SizeF dateSize = g.MeasureString(shortDate, drawFont);
 
            bmp = new Bitmap(bmp, Convert.ToInt32(dateSize.Width), Convert.ToInt32(dateSize.Height));
            g = Graphics.FromImage(bmp);
 
            g.FillRectangle(Brushes.White, 0, 0, 500, 50);
            g.DrawString(shortDate, drawFont, Brushes.Red, new PointF(0, 0));
 
// Continue to use the g and bmp param as required

Open in new window

0
 
LVL 5

Assisted Solution

by:gazzzzzzer
gazzzzzzer earned 300 total points
ID: 24404123
Sorry , you do not need or unlikely to want the line : g.FillRectangle(Brushes.White, 0, 0, 500, 50);

Here is the updated code:
            Bitmap bmp = new Bitmap(500, 50);
            Graphics g = Graphics.FromImage(bmp);
            
            string shortDate = DateTime.Now.ToShortDateString();
            Font drawFont = new Font("Arial", 32F);
            SizeF dateSize = g.MeasureString(shortDate, drawFont);
 
            bmp = new Bitmap(bmp, Convert.ToInt32(dateSize.Width), Convert.ToInt32(dateSize.Height));
            g = Graphics.FromImage(bmp);
 
            g.DrawString(shortDate, drawFont, Brushes.Red, new PointF(0, 0));
 
// Continue to use the g and bmp param as required

Open in new window

0

Featured Post

Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
VS 2017 18 39
transition to visual .net from vb6 5 37
SSIS Start 2 20
Unlocking a column in excel using C# 17 18
Many of us here at EE write code. Many of us write exceptional code; just as many of us write exception-prone code. As we all should know, exceptions are a mechanism for handling errors which are typically out of our control. From database errors, t…
Entity Framework is a powerful tool to help you interact with the DataBase but still doesn't help much when we have a Stored Procedure that returns more than one resultset. The solution takes some of out-of-the-box thinking; read on!
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question