/// <summary>
/// User interfaces the piemenu.
/// </summary>
/// <returns>The piemenu.</returns>
/// <param name="ctx">Context.</param>
/// <param name="pos">Position.</param>
/// <param name="radius">Radius.</param>
/// <param name="icons">Icons.</param>
/// <param name="item_count">Item count.</param>
public static int ui_piemenu(NuklearContext ctx, Nuklear.nk_vec2 pos, float radius,
Nuklear.nk_image[] icons, int item_count)
{
var ret = -1;
/* pie menu popup */
var border = ctx.Ctx.style.window.border_color;
var background = ctx.Ctx.style.window.fixed_background;
ctx.Ctx.style.window.fixed_background = Nuklear.nk_style_item_hide();
ctx.Ctx.style.window.border_color = Nuklear.nk_rgba(0, 0, 0, 0);
var total_space = ctx.WindowGetContentRegion();
ctx.Ctx.style.window.spacing = Nuklear.nk_vec2_(0, 0);
ctx.Ctx.style.window.padding = Nuklear.nk_vec2_(0, 0);
if (ctx.PopupBegin(Nuklear.NK_POPUP_STATIC, "piemenu", Nuklear.NK_WINDOW_NO_SCROLLBAR,
Nuklear.nk_rect_(pos.x - total_space.x - radius, pos.y - radius - total_space.y,
2 * radius, 2 * radius)))
{
var o = ctx.WindowGetCanvas();
var inp = ctx.Ctx.input;
total_space = ctx.WindowGetContentRegion();
ctx.Ctx.style.window.spacing = Nuklear.nk_vec2_(4, 4);
ctx.Ctx.style.window.padding = Nuklear.nk_vec2_(8, 8);
ctx.LayoutRowDynamic(total_space.h, 1);
Nuklear.nk_rect bounds;
Nuklear.nk_widget(&bounds, ctx.Ctx);
/* outer circle */
Nuklear.nk_fill_circle(o, bounds, Nuklear.nk_rgb(50, 50, 50));
int active_item;
{
/* circle buttons */
var step = 2 * 3.141592654f / Math.Max(1, item_count);
float a_min = 0;
var a_max = step;
var center = Nuklear.nk_vec2_(bounds.x + bounds.w / 2.0f, bounds.y + bounds.h / 2.0f);
var drag = Nuklear.nk_vec2_(inp.mouse.pos.x - center.x, inp.mouse.pos.y - center.y);
var angle = (float)Math.Atan2(drag.y, drag.x);
if (angle < -0.0f)
{
angle += 2.0f * 3.141592654f;
}
active_item = (int)(angle / step);
int i;
for (i = 0; i < item_count; ++i)
{
Nuklear.nk_rect content;
Nuklear.nk_fill_arc(o, center.x, center.y, bounds.w / 2.0f,
a_min, a_max, active_item == i ? Nuklear.nk_rgb(45, 100, 255) : Nuklear.nk_rgb(60, 60, 60));
/* separator line */
var rx = bounds.w / 2.0f;
float ry = 0;
var dx = rx * (float)Math.Cos(a_min) - ry * (float)Math.Sin(a_min);
var dy = rx * (float)Math.Sin(a_min) + ry * (float)Math.Cos(a_min);
Nuklear.nk_stroke_line(o, center.x, center.y,
center.x + dx, center.y + dy, 1.0f, Nuklear.nk_rgb(50, 50, 50));
/* button content */
var a = a_min + (a_max - a_min) / 2.0f;
rx = bounds.w / 2.5f;
ry = 0;
content.w = 30;
content.h = 30;
content.x = center.x + (rx * (float)Math.Cos(a) - ry * (float)Math.Sin(a) - content.w / 2.0f);
content.y = center.y + (rx * (float)Math.Sin(a) + ry * (float)Math.Cos(a) - content.h / 2.0f);
Nuklear.nk_draw_image(o, content, icons[i], Nuklear.nk_rgb(255, 255, 255));
a_min = a_max;
a_max += step;
}
}
{
/* inner circle */
Nuklear.nk_rect inner;
inner.x = bounds.x + bounds.w / 2 - bounds.w / 4;
inner.y = bounds.y + bounds.h / 2 - bounds.h / 4;
inner.w = bounds.w / 2;
inner.h = bounds.h / 2;
Nuklear.nk_fill_circle(o, inner, Nuklear.nk_rgb(45, 45, 45));
/* active icon content */
bounds.w = inner.w / 2.0f;
bounds.h = inner.h / 2.0f;
bounds.x = inner.x + inner.w / 2 - bounds.w / 2;
bounds.y = inner.y + inner.h / 2 - bounds.h / 2;
Nuklear.nk_draw_image(o, bounds, icons[active_item], Nuklear.nk_rgb(255, 255, 255));
}
ctx.LayoutSpaceEnd();
if (Nuklear.nk_input_is_mouse_down(ctx.Ctx.input, Nuklear.NK_BUTTON_RIGHT) == 0)
{
ctx.PopupClose();
ret = active_item;
}
}
else
{
ret = -2;
}
ctx.Ctx.style.window.spacing = Nuklear.nk_vec2_(4, 4);
ctx.Ctx.style.window.padding = Nuklear.nk_vec2_(8, 8);
ctx.PopupEnd();
ctx.Ctx.style.window.fixed_background = background;
ctx.Ctx.style.window.border_color = border;
return(ret);
}