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Draw/Paint speed slow [message #39112]

Sat, 16 February 2013 10:30

deep
Messages: 268
Registered: July 2011
Location: Bangalore

Experienced Member

Hi,

I am making spirograph ( Epitrochoid/Hypotrochoid curves) drawing app. Paint derived from Examples/PainterExamples.

I have attached the project.

To draw spirograph with 12300 path points my routine take approximately 500 ms.

Want some suggestions to improve speed of draw.

I want to show animation like this

http://en.wikipedia.org/wiki/File:EpitrochoidOn3-generation. gif

Logged time data

Prepare S : 17183790
Prepare E : 17183790

Time paint0 start : 17183806
Time paint0 end  : 17185335

 Path points : 12313

Draw Image S : 17185335
Draw Image E : 17185350

Attachment: GeoFun.7z
(Size: 2.73KB, Downloaded 332 times)

Warm Regards

Deepak

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Re: Draw/Paint speed slow [message #39120 is a reply to message #39112]

Sat, 16 February 2013 19:47

mirek
Messages: 14257
Registered: November 2005

Ultimate Member

Not sure what is your CPU, but mine 2.6Ghz Celeron does it in 25ms.

Do you benchmark it in Optimal mode? (For painter there is a HUGE difference...)

About optimizations:

The only thing that comes to mind is to combine all lines (or those possible with same width and color) lines into single Stroke, something like (quick fix):

		for(int i = 0; i < data.GetCount(); i++) {
			Vector<Pointf>& p = data[i].point;
			sw.Move(x1 + p[0].x, y1 + p[0].y);
	
			cnt2 = p.GetCount();
			
			for(int j = 1; j < p.GetCount(); j++)  
				sw.Line(x1 + p[j].x, y1 + p[j].y);
	
	//		if(data[i].filled)  sw.Fill(data[i].color).EvenOdd(true);
		}
		sw.Stroke(data[0].penwidth, data[0].color);

Anyway, it appears to only improve speed by 10%...

Mirek

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Re: Draw/Paint speed slow [message #39125 is a reply to message #39120]

Sun, 17 February 2013 07:40

deep
Messages: 268
Registered: July 2011
Location: Bangalore

Experienced Member

Mirek,

Thank you for response.

I have i7 1.73 Gz processor.

In my test case all lines are same width and color.

When compiled "Release->optimal" and "Release->optimised for speed" It is working much faster. I get about 40 ms time for same result.

1. Any hint on animation. For incremental Draw/Paint.
2. For filling the colors like in enclosed image. Hints on how to achieve it.

index.php?t=getfile&id=4061&private=0

Attachment: fig1.png
(Size: 46.33KB, Downloaded 780 times)

Warm Regards

Deepak

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Re: Draw/Paint speed slow [message #39126 is a reply to message #39125]

Sun, 17 February 2013 09:12

mirek
Messages: 14257
Registered: November 2005

Ultimate Member

deep wrote on Sun, 17 February 2013 01:40

examples/AnimatedHello

Quote:

2. For filling the colors like in enclosed image. Hints on how to achieve it.

Not sure, but perhaps draw it twice with different winding rule?

Mirek

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Re: Draw/Paint speed slow [message #39127 is a reply to message #39126]

Sun, 17 February 2013 10:38

deep
Messages: 268
Registered: July 2011
Location: Bangalore

Experienced Member

Quote:

Not sure, but perhaps draw it twice with different winding rule?

What is 'Winding rule'?

When I use fill sw.Fill(Blue()) it fills the total shape to outer boundary.

This is a single closed curve intersecting to self multiple times. Is there any way to find bounding curve and fill color like mspaint does.

Warm Regards

Deepak

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Re: Draw/Paint speed slow [message #39128 is a reply to message #39127]

Sun, 17 February 2013 10:55

mirek
Messages: 14257
Registered: November 2005

Ultimate Member

Painter::EvenOdd, try with "true".

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Re: Draw/Paint speed slow [message #39129 is a reply to message #39128]

Sun, 17 February 2013 11:09

deep
Messages: 268
Registered: July 2011
Location: Bangalore

Experienced Member

sw.Fill(Yellow()).EvenOdd(true);

Gives full fill with single color.

Warm Regards

Deepak

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Re: Draw/Paint speed slow [message #39182 is a reply to message #39129]

Sun, 24 February 2013 14:30

mirek
Messages: 14257
Registered: November 2005

Ultimate Member

sw.EvenOdd(true).Fill(Yellow());

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Re: Draw/Paint speed slow [message #39183 is a reply to message #39182]

Mon, 25 February 2013 07:20

deep
Messages: 268
Registered: July 2011
Location: Bangalore

Experienced Member

Hi Mirek,

Thanks, It worked.
Sequence is important. First set EvenOdd and then Fill.

I checked with gradient Fill also.

Is there any method to specify even and odd colors?

In this sample image I drawn circle first with gradient and then Spirograph.

index.php?t=getfile&id=4069&private=0

Attachment: Image1.png
(Size: 68.98KB, Downloaded 688 times)

Warm Regards

Deepak

[Updated on: Mon, 25 February 2013 07:22]

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