How to draw anti-aliased circle in OpenGL?

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How to draw anti-aliased circle with iPhone OpenGL ES

There are three main ways I know of to draw a simple circle in OpenGL ES, as provided by the iPhone. They are all based on a simple algorithm (the VBO version is below). void circleBufferData(GLenum target, float radius, GLsizei count, GLenum usage) { const int segments = count - 2; const float coefficient = 2.0f * (float) M_PI / segments; float *vertices = new float[2 * (segments + 2)]; vertices[0] = 0; vertices[1] = 0; for (int i = 0; i <= segments; ++i) { float radians = i * coefficient...

Answer:

Antialiasing in the iOS OpenGL ES impelmentation is severely limited. You won't be able to draw antialiased...

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ScootyPuff at Stack Overflow Mark as irrelevant Undo

Other solutions

Answer:

It wouldn't be possible for anyone to answer your question in this short space. However, if you click...

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Amanda Wells at Blurtit.com Mark as irrelevant Undo

Calc question? Draw the unit circle and plot the point P=(4,2). Observe there are TWO lines tangent to the circle passing through the point?

Draw the unit circle and plot the point P=(4,2). Observe there are TWO lines tangent to the circle passing through the point P. Answer the questions below with 3 decimal places of ...show more

Answer:

Two approaches I can think of for this one: 1. A. draw the right triangle from the point P to the origin...

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MPXAXQ6HHNK3IZS3YLUOL3GTAI at Yahoo! Answers Mark as irrelevant Undo

Who was the only person who could draw a perfect circle?

there is no one in the world today who can draw a perfect circle, but there was one person in the past who could draw a perfect circle free hand - who was it?

Answer:

There are people who think Leonardo and Newton could both draw a perfect circle, but I do not think...

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Dante at Yahoo! Answers Mark as irrelevant Undo

Can you draw a perfect circle?

I argue that if you've never seen a perfect circle, you still can know what one is. I know this because you could still tell when one circle more closely approximates a perfect circle than another one does. Therefore, this knowledge must not have come...

Answer:

The word PERFECT is in the eye of the beholder. No matter how much one can prove to you, nothing can...

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JT at Yahoo! Answers Mark as irrelevant Undo

My math teacher won't let us draw the unit circle on our tests anymore!?

He said that we can't look at a unit circle on our test, because that means we don't really know it, and we need to know everything by memory at the snap of a finger, that it will make us understand everything better. But I don't know how to think of...

Answer:

I find memorizing is not a good idea in math. Now I don't mean you shouldn't ever memorize anything...

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Elise at Yahoo! Answers Mark as irrelevant Undo

Draw horizontal and vertical lines lines inside a circle.?

please specify how to draw horizontal lines inside a circle, like the chords of circle;

Answer:

Well, I'm not doing the MATH, per se, but the method of making an answer is easy. You have your circle...

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aqeel m at Yahoo! Answers Mark as irrelevant Undo

Did Da Vinci draw the first Freehand perfect circle?

I heard that Da Vinci had to draw a freehanded perfect circle in order to paint the Cistene Chapel, but then I learned Michelangelo painted the Cistene chapel, but I still see everywhere that Da Vinci was the first artist that was able to freehand a...

Answer:

wow, never heard of that!...sounds pretty crazy- i'm gonna have to look into that. you deserve a star...

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Curious Moosilator at Yahoo! Answers Mark as irrelevant Undo

How to draw the circle of fifths as well as how does it work?

I'm given an assignment to draw and explain the circle of fifths to some gr 7's. Here are some questions I'm have on it: 1. At the bottom of the circle of fifths, there is ...show more

Answer:

1) You don't need to, but if you don't change from #s to bs you end up with needlessly complex keys...

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N2ENHQGREMAPTEBNXZQI3EZMXU at Yahoo! Answers Mark as irrelevant Undo

Is it possible to draw a circle when we know its area?

We all know that we can find out the area of circle. But I am wondering whether it is possible to draw a circle when we know its area. This question is related to one of the most famous Math problem. (I will not tell what that problem is) I believe if...

Answer:

It's pretty much a troll question. What makes me sure is this detail here: "This question is related...

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André Cesarino at Quora Mark as irrelevant Undo

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