How to rotate an image continously?

Question

I need to display an image which is rotating continuously until that form closes. This means that the image should keep on rotating. I am trying this sample in windows application with c#. I did an example that text in the label is moving by the following code:

label1.Location = new Point(label1.Location.X + 5, label1.Location.Y);

It may be the text in the label must rotate not like moving horizontally or vertically.

Then perhaps you *should* try WPF to do this. In WPF you only need to add a rotation transform to the label. In WinForms you need to draw the string using GDI+, taking care to delete any previous text strings before drawing the new one, avoid flickering by using double buffering etc — Panagiotis Kanavos, Dec 24 '13 at 09:40

BartoszKP · Answer 1 · 2013-12-24T10:20:35.233

2

You can do it with the following steps:

add an angle variable
add a "canvas" control to your form, e.g. a Panel
override its Paint event
obtain its Graphics contex and set a rotation transform. You can use Rotation method supplying the value of the angle variable.
use label's DrawToBitmap method, to render your label onto a panel
modify angle and call first the Invalidate and then Update on the control that owns the canvas you're drawing on (in this example - the Panel)

Your label shouldn't be added in the designer.

You can also use it without a label control is a simple text will suffice - you can just use the DrawString method then.

edited Dec 24 '13 at 10:20

answered Dec 24 '13 at 09:44

BartoszKP

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int angle = 90; Graphics g = e.Graphics; Image i = new Bitmap(@"C:\Users\Public\Pictures\Sample Pictures\Jellyfish.jpg"); g.TranslateTransform((float)i.Width / 2, (float)i.Height / 2); g.RotateTransform(angle); g.TranslateTransform(-(float)i.Width / 2, -(float)i.Height / 2); g.DrawImage(i, new Point(0,0)); g.RotateTransform(360); – user2897388 Dec 24 '13 at 10:13
I wrote this code but it is not moving,it is static no motion in that – user2897388 Dec 24 '13 at 10:14
@user2897388 Why should it move when the angle is constant? – BartoszKP Dec 24 '13 at 10:15
if the angle is 45 or 90 also it is not moving – user2897388 Dec 24 '13 at 10:18
which angle I should mention to move – user2897388 Dec 24 '13 at 10:20
@user2897388 There is only one angle here. Not sure what are you talking about. I've updated the answer with more details, perhaps this was what you were missing. – BartoszKP Dec 24 '13 at 10:21
g.RotateTransform(angle); here angle=90 – user2897388 Dec 24 '13 at 10:41

Paul Michaels · Answer 2 · 2013-12-24T10:10:37.523

1

Try something like this:

<Storyboard x :Key="sbSpin">
<DoubleAnimation
  Storyboard.TargetName="Spin"
  Storyboard.TargetProperty="(Button.RenderTransform).(RotateTransform.Angle)"
  From="0"
  To="360"
  RepeatBehavior="Forever"
  Duration="0:0:3" Completed ="DoubleAnimation_Completed" />
</Storyboard>

I wrote a series of blog posts on this recently:

http://pmichaelsdev.wordpress.com/2013/11/18/animation-in-xaml-part-3/

edited Dec 24 '13 at 10:10

answered Dec 24 '13 at 09:39

Paul Michaels

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sorry to say that I am not using WPF – user2897388 Dec 24 '13 at 09:42
Although the question is about WinForms, this just shows how *easy* it is to do this with WPF. The equivalent GDI+ code is rather more convoluted – Panagiotis Kanavos Dec 24 '13 at 09:42
@PanagiotisKanavos Yeah, we can add also 10 other answers showing how easy it can be done in other numerous technologies. It won't change the fact that they're off-topic :) – BartoszKP Dec 24 '13 at 09:46
So is an answer that rotates statically instead of animating. Besides, it's customary to mark the duplicate answer so people can see the actual code – Panagiotis Kanavos Dec 24 '13 at 09:50
Sorry, I didn't realise this wasn't for WPF – Paul Michaels Dec 24 '13 at 10:11

score 0 · Answer 3 · answered Dec 24 '13 at 11:56

There are plenty of articles which explain how to rotate Image. You need some more customizations to keep it rotating while your form is loaded.

Just download the source code and add following piece of code in Form1. Start a new thread and call a function which keeps rotating the image.

       private void Form1_Load(object sender, EventArgs e)
        {
            Thread t = new Thread(KeepRotating);   // Kick off a new thread
            t.Start();
        }

       void KeepRotating()
        {
            for (float i = 1; i <= 360; i++)
            {
                RotateImage(pictureBox1, image, i);
                Thread.Sleep(20);  // for slower rotation, Avoid if not needed
                if (i == 360f)
                {
                    i = 1f;
                }
            }
        }

Output looks something like this.

enter image description here

P.S. This is a very simple and raw method to accomplish the task. Make sure you take care of exception handling and memory leaks.

Thanku it is working fine – user2897388 Jan 22 '14 at 09:12 — user2897388, Jan 22 '14 at 09:12

How to rotate an image continously?

3 Answers3