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feat: add persistent low-health vignette when HP below 20%

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Screen edges pulse red (at ~1.5 Hz) whenever the player is alive but
below 20% HP, with intensity scaling inversely with remaining health.
Complements the existing on-hit damage flash by providing continuous
danger awareness during sustained low-HP situations.
This commit is contained in:
Kelsi 2026-03-12 07:07:46 -07:00
parent b8e7fee9e7
commit 17022b9b40
1 changed files with 39 additions and 0 deletions
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39
src/ui/game_screen.cpp
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@ -773,6 +773,45 @@ void GameScreen::render(game::GameHandler& gameHandler) {
}
}
// Persistent low-health vignette — pulsing red edges when HP < 20%
{
auto playerEntity = gameHandler.getEntityManager().getEntity(gameHandler.getPlayerGuid());
bool isDead = gameHandler.isPlayerDead();
float hpPct = 1.0f;
if (!isDead && playerEntity &&
(playerEntity->getType() == game::ObjectType::PLAYER ||
playerEntity->getType() == game::ObjectType::UNIT)) {
auto unit = std::static_pointer_cast<game::Unit>(playerEntity);
if (unit->getMaxHealth() > 0)
hpPct = static_cast<float>(unit->getHealth()) / static_cast<float>(unit->getMaxHealth());
}
// Only show when alive and below 20% HP; intensity increases as HP drops
if (!isDead && hpPct < 0.20f && hpPct > 0.0f) {
// Base intensity from HP deficit (0 at 20%, 1 at 0%); pulse at ~1.5 Hz
float danger = (0.20f - hpPct) / 0.20f;
float pulse = 0.55f + 0.45f * std::sin(static_cast<float>(ImGui::GetTime()) * 9.4f);
int alpha = static_cast<int>(danger * pulse * 90.0f); // max ~90 alpha, subtle
if (alpha > 0) {
ImDrawList* fg = ImGui::GetForegroundDrawList();
ImGuiIO& io = ImGui::GetIO();
const float W = io.DisplaySize.x;
const float H = io.DisplaySize.y;
const float thickness = std::min(W, H) * 0.15f;
const ImU32 edgeCol = IM_COL32(200, 0, 0, alpha);
const ImU32 fadeCol = IM_COL32(200, 0, 0, 0);
fg->AddRectFilledMultiColor(ImVec2(0, 0), ImVec2(W, thickness),
edgeCol, edgeCol, fadeCol, fadeCol);
fg->AddRectFilledMultiColor(ImVec2(0, H - thickness), ImVec2(W, H),
fadeCol, fadeCol, edgeCol, edgeCol);
fg->AddRectFilledMultiColor(ImVec2(0, 0), ImVec2(thickness, H),
edgeCol, fadeCol, fadeCol, edgeCol);
fg->AddRectFilledMultiColor(ImVec2(W - thickness, 0), ImVec2(W, H),
fadeCol, edgeCol, edgeCol, fadeCol);
}
}
}
// Level-up golden burst overlay
if (levelUpFlashAlpha_ > 0.0f) {
levelUpFlashAlpha_ -= ImGui::GetIO().DeltaTime * 1.0f; // fade over ~1 second