draw circle

[beegee]

Hello,

I have a question related to the circle drawing method of PDN3. ( brush )

I developed at my own a bitmap class, which can draw faster than getpixel, setpixel of .NET. But when I draw onto the bitmap in my level editor with the circle tool it's too slow. How does this thing works in PDN3. I played around with it, and it's much faster than mine.

FillEllipse(20,20); // .NET -- 270-280 ticks

DrawCircle(20,20); // My method -- 190-210 ticks

How is it done in PDN3? Has it better drawing times or is there a trick?

And would someone take the time to post the specific code snippet here? Much thanks.

[beegee]

Hello,

I have a question related to the circle drawing method of PDN3. ( brush )

I developed at my own a bitmap class, which can draw faster than getpixel, setpixel of .NET. But when I draw onto the bitmap in my level editor with the circle tool it's too slow. How does this thing works in PDN3. I played around with it, and it's much faster than mine.

FillEllipse(20,20); // .NET -- 270-280 ticks

DrawCircle(20,20); // My method -- 190-210 ticks

How is it done in PDN3? Has it better drawing times or is there a trick?

And would someone take the time to post the specific code snippet here? Much thanks.

[pyrochild]

the System.Drawing.Graphics class has functions called DrawEllipse() and FillEllipse(), which are, of course, far faster than setting one pixel at a time. Plus the Graphics class has extremely easy to use anti-aliasing.....

[pyrochild]

the System.Drawing.Graphics class has functions called DrawEllipse() and FillEllipse(), which are, of course, far faster than setting one pixel at a time. Plus the Graphics class has extremely easy to use anti-aliasing.....

[BoltBait]

I haven't looked in the code to answer your question, but in my expirence, the best way to draw standard shapes is to use GDI+.

You can see how to do it in my source code here:

http://paintdotnet.12.forumer.com/viewtopic.php?t=2580

(Ignore the source code listing in that post. Instead, download the VS2005 project zip file listed under the "Source Code" section.)

The nice thing about using GDI+ is the fact that you can draw anti-aliased shapes, fast.

[BoltBait]

I haven't looked in the code to answer your question, but in my expirence, the best way to draw standard shapes is to use GDI+.

You can see how to do it in my source code here:

http://paintdotnet.12.forumer.com/viewtopic.php?t=2580

(Ignore the source code listing in that post. Instead, download the VS2005 project zip file listed under the "Source Code" section.)

The nice thing about using GDI+ is the fact that you can draw anti-aliased shapes, fast.

[beegee]

I've developed my own bitmap class, because then I have much more possibilites related to the perfomance. My other reason is, that I need this later for XNA purposes and so it's much more easier to port this class. I just found some bottlenecks in my code, the invalidate, lock/unlock bits thing and the circle calculation. I'll post later the results, when I'm finished.

[beegee]

I've developed my own bitmap class, because then I have much more possibilites related to the perfomance. My other reason is, that I need this later for XNA purposes and so it's much more easier to port this class. I just found some bottlenecks in my code, the invalidate, lock/unlock bits thing and the circle calculation. I'll post later the results, when I'm finished.