Question

Duplicating the gradient in this picture GDI+

Asked by: stormist

I'm trying to duplicate the gradient on the face of this clock where the gradient origin is on the bottom right and it fades into the grayish color. The code below doesn't seem to work nor does
LinearGradientMode.BackwardDiagonal
LinearGradientMode.ForwardDiagonal
LinearGradientMode.Vertical
LinearGradientMode.Horizontal
variations on the gradient brush. Any suggestions would be appreciated.

Color color1 = Color.FromArgb(217, 224, 226);
                    Color color2 = Color.FromArgb(255, 255, 255);
                    LinearGradientBrush gradientBrush =
                      new LinearGradientBrush(rect,
                      color2,
                      color1,
                      LinearGradientMode.);
                    graphics.FillEllipse(gradientBrush, rect);
                    gradientBrush.Dispose();

                                  
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Asked On
2009-09-16 at 22:25:49ID24738774
Topics

Microsoft Visual C#.Net

,

.NET

Participating Experts
1
Points
500
Comments
6

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Answers

 

by: DaemonFishPosted on 2009-09-16 at 23:55:51ID: 25353387

If you want to draw the entire clock using GDI I would do it the following way:

1. First draw the white circle representing the clock.
2. Then set the clipper to that same circle.
3. Then draw a big circle with a gradient from the bottom right "corner" of the clock, and up to the centre of the clock ( you might have to adjust positions some to get the effect just right, but the general idea should work fine. Not the best explanation, but I have attached an image to illustrate this.
4. Then draw the two border circles, and then the other details on the clock. Using trigonometry should give you the positions for the emelemts fairly easy.

 

by: stormistPosted on 2009-09-17 at 00:17:38ID: 25353474

Hi DaemonFish, thanks for your reply.

Do you know of any C# code examples of applying the clipper effect? How would I set it where the 2nd ellipse only draws where it intersects with the circle?

 

by: DaemonFishPosted on 2009-09-18 at 00:11:28ID: 25363427

Hi again,

Just create a graphicspath first.

GraphicsPath p = new GraphicsPath();

Then take p.AddEllipse( x,y,width,height);

Then on the graphics object where you draw the clock, use

g.Clip = new Region(p);

Then you draw the big ellipse, and if you require to draw outside the clipper again just call g.ResetClip();

 

by: stormistPosted on 2009-09-18 at 11:15:35ID: 25368480

I've successfully divided the top gloss and bottom gloss into two different paths. I can't seem to duplicate the gradient where it starts out white bottom right and extends outward. Just thought I'd run it by you really quick, any ideas how to do that? I tried a lineargradient with an angle passed to it, but the angle doesn't seem to have much effect.

 

by: DaemonFishPosted on 2009-09-18 at 13:39:47ID: 25369802

Have you tried using a LinearGradientBrush setting one point to the centre of the clock with the dark color, and the lower right corner of the clock with white?

 

by: DaemonFishPosted on 2009-09-18 at 13:43:31ID: 25369826

Also, take a look here. This is actually the effect you are looking for, except that should start with white in the centre, and the dark color on the outside.

http://www.java2s.com/Code/CSharp/2D-Graphics/PathGradientDemo.htm

Best of luck :)

20120131-EE-VQP-002

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