RadialMenu/geometry.cpp at dev · ej-mentol/RadialMenu · GitHub

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#include <metahook.h>
#include "geometry.h"

std::vector<ItemAngle> g_CachedItemAngles;
static std::string g_CachedMenuName;
static int g_CachedPage = -1;

// Distributes N items evenly around the circle (2*PI / N per sector).
// Sector 0 starts at 12 o'clock (-PI/2).
std::vector<ItemAngle> GetItemAngles(const std::vector<RadialMenuEntry>& active_items)
{
	int M = (int)active_items.size();
	std::vector<ItemAngle> angles(M);
	if (M <= 0) return angles;

	float sector_width = 2.0f * IM_PI / M;
	for (int i = 0; i < M; i++)
	{
		float slot_angle = -IM_PI / 2.0f + i * sector_width;
		angles[i].start = slot_angle - sector_width / 2.0f;
		angles[i].end   = slot_angle + sector_width / 2.0f;
	}
	return angles;
}

void UpdateItemAnglesCache(const std::vector<RadialMenuEntry>& active_items)
{
	if (g_CachedMenuName == g_ActiveMenuName && g_CachedPage == g_CurrentMenuPage && !g_CachedItemAngles.empty())
		return;

	g_CachedItemAngles = GetItemAngles(active_items);
	g_CachedMenuName = g_ActiveMenuName;
	g_CachedPage = g_CurrentMenuPage;
}

void ClearItemAnglesCache()
{
	g_CachedItemAngles.clear();
	g_CachedMenuName.clear();
	g_CachedPage = -1;
}