Drawing a Circle Based on Time

[Lotzi11]

I want to draw a circle in C++ depending on a specific time passed into the loop. What is a good way to do this?

[Arcade]

• Tutorial on how to draw shapes with SFML
• Full SFML CircleShape class reference
• Tutorial on how to measure time with SFML

[NGM88]

You didn't explain how the circle would depend on the time. Would the time passed determine when the circle is drawn or the circle's attributes such as size or both?

[Lotzi11]

Sorry, I did a terrible job describing my issue.

I want to draw an outline of a circle around my mouse cursor whenever the player reloads. My idea is to draw the circle in a specific amount of time depending on the gun. So if a guns reload speed is 6 seconds, then the circle should be fully drawn in 6 seconds. This would mean that I would like to drawn some number of points in order to achieve 360 degrees in 6 seconds. Does anyone know of a way to solve this problem.

Also, I'm new to drawing shapes in SFML and I'm trying to find the best way to draw my circle. What is the best way to draw only the outline of a circle?

[NGM88]

That's tricky.

Don't use CircleShape at all, use sf::Points in VertexArray.

You have to know some trigonometry though (which I don't  )

You can find any point on a circle with the equation:

point.x = radius * cos(angle);
point.y = radius * sin(angle);

If you draw 360 points over reload time you have your circle.