Extrudes a 2D object roundly from 0 to 180 degrees.

## Parameters

`size`

: The size of a rectangle which can cover the 2D object. Accepts single value, square with both sides this length. It also accepts 2 value array`[x, y]`

, rectangle with dimensions`x`

and`y`

.`round_r`

: The radius when extruding roundly.`angle`

: 0 to 180 degrees. The default value is 90 degrees.`convexity`

,`twist`

: The same as respective parameters of`linear_extrude`

.`$fa`

,`$fs`

,`$fn`

: Used to control the round fragments. Check the circle module for more details.

## Examples

```
include <rounded_extrude.scad>;
$fn = 48;
circle_r = 10;
round_r = 5;
rounded_extrude(circle_r * 2, round_r)
circle(circle_r);
translate([0, 0, round_r])
cylinder(h = 20, r1 = circle_r + round_r, r2 = 0);
```