Re: Shouldn't Cairo use/offer degrees rather than radians?

Lawrence D'Oliveiro <[email protected]> writes:

> On Fri, 30 Jun 2017 07:02:36 +0200, David Kastrup wrote:
>
>> Lawrence D'Oliveiro <[email protected]> writes:
>> 
>>> You do realize that your claim about Cairo’s “inability to reliably
>>> draw a half circle that seamlessly connects with another half circle
>>> under any rasterization” is complete nonsense, right?  
>> 
>> Sigh.  If you cannot specify an angle for pi for which sin(angle)==0,
>> you will have rasterizations of half circle arcs that won't line up
>> perfectly because you then cannot make the half circles butt up
>> perfectly, and "too small to be noticeable" becomes a statistic rather
>> than a static feature under rasterization.
>
> There is no such situation.



What is wrong with this list?

-- 
David Kastrup

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#include <cairo.h>
#include <math.h>

int main()
{
  cairo_surface_t *surface =
    cairo_image_surface_create (CAIRO_FORMAT_RGB16_565, 30, 20);
  cairo_t *cr = cairo_create (surface);
  cairo_set_line_width (cr, 2);
  cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
  cairo_set_source_rgba (cr, 1, 1, 1, 1);
  cairo_new_sub_path (cr);
  cairo_arc (cr, 15, 0.501954078674316, 5, 0, M_PI);
  cairo_stroke (cr);
  cairo_destroy (cr);
  cairo_surface_write_to_png (surface, "hello.png");
  cairo_surface_destroy (surface);
  return 0;
}