Graphics and PathGradientBrush transform error.

Question

0.00/5 (No votes)

See more:

The next code goes wrong after e.Graphics.RotateTransform(30);

C#

public Form1()
{
    InitializeComponent();

    this.BackColor = Color.Black;

    this.DoubleBuffered = true;
    this.Paint += Draw;
    this.Invalidate();
}

private void Draw(object sender, System.Windows.Forms.PaintEventArgs e)
{
    GraphicsPath path = new GraphicsPath();

    path.AddRectangle(new Rectangle(50, 50, 100, 20));

    using (PathGradientBrush pgb = new PathGradientBrush(path))
    {
        pgb.FocusScales = new PointF(1f, 0f);
        pgb.CenterColor = Color.FromArgb(255, 255, 255, 255);
        pgb.SurroundColors = new Color[] { Color.FromArgb(0, 255, 255, 255) };
        e.Graphics.RotateTransform(30); // Error!
        e.Graphics.FillRectangle(pgb, 0, 0, 200, 200);
    }
}

Right:
Without e.Graphics.RotateTransform(30);
https://social.msdn.microsoft.com/Forums/getfile/542870[^]

Wrong:
With e.Graphics.RotateTransform(30);
https://social.msdn.microsoft.com/Forums/getfile/542871[^]

How to fix?
I think i should also transform PathGradientBrush.

Posted 10-Oct-14 0:18am

Ziya1995

Updated 11-Oct-14 4:16am

v2

Add a Solution

Comments

Dave Kreskowiak 10-Oct-14 8:14am

Why is it every newb thinks that the error message isn't important?

Ziya1995 10-Oct-14 8:46am

It is not a message, it is right, but the result doesn't suit, look at the second picture.

Dave Kreskowiak 10-Oct-14 18:28pm

Sorry, but I don't click on links I don't trust.

Also, your question has the word "error" in a couple of places, so...

Lastly, what do you think should be correct? I can't see that so I don't know what you're expecting.

Ziya1995 11-Oct-14 2:49am

The word "Error" shows what i call as error, not what compiler calls.

You can't click on the links, this is all the problem, but let me explain, just copy the code and check out and you will see that it results a messy image.
And then remove the RotateTransform line and check out again to see the right image. I wanna rotate that right image.

It is just simple to understand and even to solve.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Patrick H A C Ens · Answer 1 · 2014-10-14T20:48:00

the thing is that you're filling an rectangle with that brush completely different from the path you made the brush try this

C#

private void Draw(object sender, System.Windows.Forms.PaintEventArgs e)
		{
			GraphicsPath path = new GraphicsPath();
			
			path.AddRectangle(new Rectangle(50, 50, 100, 20));

			using (PathGradientBrush pgb = new PathGradientBrush(path))
			{
				pgb.FocusScales = new PointF(1f, 0f);
				pgb.CenterColor = Color.FromArgb(255, 255, 255, 255);
				pgb.SurroundColors = new Color[] { Color.FromArgb(0, 255, 255, 255) };
				e.Graphics.RotateTransform(30); // error!
				e.Graphics.FillPath(pgb, path);
				//e.Graphics.FillRectangle(pgb, 0, 0, 200, 200);
				
			}
		}