fix rect roundness

src/main.c3

@@ -27,7 +27,7 @@ fn int main(String[] args)
 {
 	ugui::Ctx ui;
 	ui.init()!!;
-	ui.font.load("/usr/share/fonts/TTF/FreeSans.ttf", 16, scale: 1.5)!!;
+	ui.font.load("/usr/share/fonts/TTF/Hack-Regular.ttf", 16, scale: 1.5)!!;
 
 	short width = 800;
 	short height = 450;
@@ -146,9 +146,10 @@ fn int main(String[] args)
 					.height = cmd.rect.rect.h,
 					.width = cmd.rect.rect.w,
 				};
-				// TODO: find a way to do real pixel-perfec rounding
-				float round = cmd.rect.radius ? 0.2 : 0;
-				rl::draw_rectangle_rounded(r, round, 2, c);
+			    float rad = cmd.rect.radius;
+				// for some weird-ass reason the straight forward inverse formula does not work
+			    float roundness = r.width > r.height ? (2.1*rad)/r.height : (2.1*rad)/r.width;
+				rl::draw_rectangle_rounded(r, roundness, 0, c);
 			case ugui::CmdType.CMD_UPDATE_ATLAS:
 				rl::unload_image(font_atlas);
 				font_atlas.data = cmd.update_atlas.raw_buffer;

src/ugui_impl.c3

@@ -56,7 +56,7 @@ fn void! Ctx.init(&ctx)
 	ctx.style.margin  = Rect{2, 2, 2, 2};
 	ctx.style.border  = Rect{2, 2, 2, 2};
 	ctx.style.padding = Rect{1, 1, 1, 1};
-	ctx.style.radius  = 4;
+	ctx.style.radius  = 5;
 	ctx.style.bgcolor = uint_to_rgba(0x282828ff);
 	ctx.style.fgcolor = uint_to_rgba(0xfbf1c7ff);
 	ctx.style.brcolor = uint_to_rgba(0xd79921ff);

src/ugui_slider.c3

@@ -98,7 +98,7 @@ fn ElemEvents! Ctx.slider_ver(&ctx, String label, Rect size)
 		}
 	}
 
-	// Draw the button
+	// Draw the slider background and handle
 	Color bg_color = uint_to_rgba(0x0000ffff);
 	Color handle_color = uint_to_rgba(0x0ff000ff);
 	ctx.push_rect(c_elem.bounds, bg_color)!;