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#include "spinner.h"
#include "imgui/imgui_internal.h"
namespace widgets
{
bool Spinner(const char *label, float radius, int thickness, const ImU32 &color)
{
ImGuiWindow *window = ImGui::GetCurrentWindow();
if (window->SkipItems)
return false;
ImGuiContext &g = *GImGui;
const ImGuiStyle &style = g.Style;
const ImGuiID id = window->GetID(label);
ImVec2 pos = window->DC.CursorPos;
ImVec2 size((radius) * 2, (radius + style.FramePadding.y) * 2);
const ImRect bb(pos, ImVec2(pos.x + size.x, pos.y + size.y));
ImGui::ItemSize(bb, style.FramePadding.y);
if (!ImGui::ItemAdd(bb, id))
return false;
// Render
window->DrawList->PathClear();
int num_segments = 30;
int start = abs(int(ImSin(g.Time * 1.8f) * (num_segments - 5)));
const float a_min = IM_PI * 2.0f * ((float)start) / (float)num_segments;
const float a_max = IM_PI * 2.0f * ((float)num_segments - 3) / (float)num_segments;
const ImVec2 centre = ImVec2(pos.x + radius, pos.y + radius + style.FramePadding.y);
for (int i = 0; i < num_segments; i++)
{
const float a = a_min + ((float)i / (float)num_segments) * (a_max - a_min);
window->DrawList->PathLineTo(ImVec2(centre.x + ImCos(a + g.Time * 8) * radius,
centre.y + ImSin(a + g.Time * 8) * radius));
}
window->DrawList->PathStroke(color, false, thickness);
return true;
}
}
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