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- 6 Мар 2017
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- 411
- Реакции
- 237
Код:
#include <imgui_internal.h>
// Return >= 0 on mouse release
// Optional int* p_selected display and update a currently selected item
int PiePopupSelectMenu(const ImVec2& center, const char* popup_id, const char** items, int items_count, int* p_selected)
{
int ret = -1;
// FIXME: Missing a call to query if Popup is open so we can move the PushStyleColor inside the BeginPopupBlock (e.g. IsPopupOpen() in imgui.cpp)
// FIXME: Our PathFill function only handle convex polygons, so we can't have items spanning an arc too large else inner concave edge artifact is too visible, hence the ImMax(7,items_count)
ImGui::PushStyleColor(ImGuiCol_WindowBg, ImVec4(0,0,0,0));
ImGui::PushStyleColor(ImGuiCol_Border, ImVec4(0,0,0,0));
if (ImGui::BeginPopup(popup_id))
{
const ImVec2 drag_delta = ImVec2(ImGui::GetIO().MousePos.x - center.x, ImGui::GetIO().MousePos.y - center.y);
const float drag_dist2 = drag_delta.x*drag_delta.x + drag_delta.y*drag_delta.y;
const ImGuiStyle& style = ImGui::GetStyle();
const float RADIUS_MIN = 30.0f;
const float RADIUS_MAX = 120.0f;
const float RADIUS_INTERACT_MIN = 20.0f;
const int ITEMS_MIN = 6;
ImDrawList* draw_list = ImGui::GetWindowDrawList();
//ImGuiWindow* window = ImGui::GetCurrentWindow();
draw_list->PushClipRectFullScreen();
draw_list->PathArcTo(center, (RADIUS_MIN + RADIUS_MAX)*0.5f, 0.0f, IM_PI*2.0f*0.99f, 32); // FIXME: 0.99f look like full arc with closed thick stroke has a bug now
draw_list->PathStroke(ImColor(0,0,0), true, RADIUS_MAX - RADIUS_MIN);
const float item_arc_span = 2*IM_PI / ImMax(ITEMS_MIN, items_count);
float drag_angle = atan2f(drag_delta.y, drag_delta.x);
if (drag_angle < -0.5f*item_arc_span)
drag_angle += 2.0f*IM_PI;
//ImGui::Text("%f", drag_angle); // [Debug]
int item_hovered = -1;
for (int item_n = 0; item_n < items_count; item_n++)
{
const char* item_label = items[item_n];
const float item_ang_min = item_arc_span * (item_n+0.02f) - item_arc_span*0.5f; // FIXME: Could calculate padding angle based on how many pixels they'll take
const float item_ang_max = item_arc_span * (item_n+0.98f) - item_arc_span*0.5f;
bool hovered = false;
if (drag_dist2 >= RADIUS_INTERACT_MIN*RADIUS_INTERACT_MIN)
{
if (drag_angle >= item_ang_min && drag_angle < item_ang_max)
hovered = true;
}
bool selected = p_selected && (*p_selected == item_n);
int arc_segments = (int)(32 * item_arc_span / (2*IM_PI)) + 1;
draw_list->PathArcTo(center, RADIUS_MAX - style.ItemInnerSpacing.x, item_ang_min, item_ang_max, arc_segments);
draw_list->PathArcTo(center, RADIUS_MIN + style.ItemInnerSpacing.x, item_ang_max, item_ang_min, arc_segments);
//draw_list->PathFill(window->Color(hovered ? ImGuiCol_HeaderHovered : ImGuiCol_FrameBg));
draw_list->PathFill(hovered ? ImColor(100,100,150) : selected ? ImColor(120,120,140) : ImColor(70,70,70));
ImVec2 text_size = ImGui::GetWindowFont()->CalcTextSizeA(ImGui::GetWindowFontSize(), FLT_MAX, 0.0f, item_label);
ImVec2 text_pos = ImVec2(
center.x + cosf((item_ang_min + item_ang_max) * 0.5f) * (RADIUS_MIN + RADIUS_MAX) * 0.5f - text_size.x * 0.5f,
center.y + sinf((item_ang_min + item_ang_max) * 0.5f) * (RADIUS_MIN + RADIUS_MAX) * 0.5f - text_size.y * 0.5f);
draw_list->AddText(text_pos, ImColor(255,255,255), item_label);
if (hovered)
item_hovered = item_n;
}
draw_list->PopClipRect();
if (ImGui::IsMouseReleased(0))
{
ImGui::CloseCurrentPopup();
ret = item_hovered;
if (p_selected)
*p_selected = item_hovered;
}
ImGui::EndPopup();
}
ImGui::PopStyleColor(2);
return ret;
}
Код:
{
static const char* test_data = "Menu";
const char* items[] = { "Orange", "Blue", "Purple", "Gray", "Yellow", "Las Vegas" };
int items_count = sizeof(items)/sizeof(*items);
static int selected = -1;
ImGui::Button(selected >= 0 ? items[selected] : "Menu", ImVec2(50,50));
if (ImGui::IsItemActive()) // Don't wait for button release to activate the pie menu
ImGui::OpenPopup("##piepopup");
ImVec2 pie_menu_center = ImGui::GetIO().MouseClickedPos[0];
int n = PiePopupSelectMenu(pie_menu_center, "##piepopup", items, items_count, &selected);
if (n >= 0)
printf("returned %d\n", n);
Пожалуйста, авторизуйтесь для просмотра ссылки.
Удачи!
@Zodiak с возвращением
UPD:
Пожалуйста, авторизуйтесь для просмотра ссылки.
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