Scarfski/tracy
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Add a horizontal position bar to flame graph.

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Now that the ruler just shows the delta time across the view it doesn't
indicate where the view is currently looking.
The new position bar fills this role to allow orientating oneself.
This commit is contained in:
rmarker
2026-05-28 21:48:14 +09:30
parent 55de5bc5ca
commit 4a9e3ea095
2 changed files with 72 additions and 5 deletions
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75
profiler/src/profiler/TracyView_FlameGraph.cpp
View File

@@ -740,6 +740,75 @@ void View::DrawFlameGraphHeader( int64_t vStart, int64_t vEnd, uint64_t period )
}
}
static void DrawFlameGraphHorizontalPosition( int64_t& vStart, int64_t& vEnd, int64_t totalSpan, uint64_t period )
{
assert( vStart < vEnd );
assert( totalSpan > 0 );
assert( period > 0 );
const auto wpos = ImGui::GetCursorScreenPos();
const auto w = ImGui::GetContentRegionAvail().x;
const auto scale = GetScale();
const auto h = std::max( 8.f * scale, 8.f );
if( w <= 0 )
{
ImGui::Dummy( ImVec2( 0, h ) );
return;
}
ImGui::InvisibleButton( "##flameHorizontalPosition", ImVec2( w, h ) );
const auto hover = ImGui::IsItemHovered();
const auto active = ImGui::IsItemActive();
auto draw = ImGui::GetWindowDrawList();
const auto fullSpan = float( totalSpan );
const auto x0 = wpos.x + w * ( float( vStart ) / fullSpan );
const auto x1 = wpos.x + w * ( float( vEnd ) / fullSpan );
auto thumbX0 = std::max( wpos.x, std::min( wpos.x + w, x0 ) );
auto thumbX1 = std::max( thumbX0, std::min( wpos.x + w, x1 ) );
const auto minThumbWidth = std::max( 9.f * scale, 9.f );
if( thumbX1 - thumbX0 < minThumbWidth )
{
const auto center = ( thumbX0 + thumbX1 ) * 0.5f;
thumbX0 = center - ( minThumbWidth * 0.5f );
thumbX1 = center + ( minThumbWidth * 0.5f );
if( thumbX0 < wpos.x )
{
thumbX0 = wpos.x;
thumbX1 = thumbX0 + minThumbWidth;
}
else if( thumbX1 > wpos.x + w )
{
thumbX1 = wpos.x + w;
thumbX0 = thumbX1 - minThumbWidth;
}
}
const auto y0 = wpos.y + floor( h * 0.25f );
const auto y1 = wpos.y + ceil( h * 0.75f );
draw->AddRectFilled( ImVec2( wpos.x, y0 ), ImVec2( wpos.x + w, y1 ), 0x33888888 );
draw->AddRectFilled( ImVec2( thumbX0, y0 ), ImVec2( thumbX1, y1 ), active ? 0xCCFFFFFF : hover ? 0xAAFFFFFF : 0x66FFFFFF );
if( hover )
{
ImGui::BeginTooltip();
TextFocused( "View span:", TimeToString( ( vEnd - vStart ) * period ) );
ImGui::EndTooltip();
}
if( active && ImGui::IsMouseDragging( 0 ) )
{
const auto delta = ImGui::GetIO().MouseDelta.x;
const auto d = int64_t( delta * totalSpan / w );
if( d != 0 )
{
vStart += d;
vEnd += d;
}
}
}
static void MergeFlameGraph( std::vector<FlameGraphItem>& dst, std::vector<FlameGraphItem>&& src )
{
for( auto& v : src )
@@ -1125,13 +1194,11 @@ void View::DrawFlameGraph()
{
m_flameGraphViewEnd = zsz;
}
else
{
ClampFlameGraphViewport( m_flameGraphViewStart, m_flameGraphViewEnd, zsz, ImGui::GetContentRegionAvail().x );
}
const auto period = m_flameMode == 0 ? 1 : m_worker.GetSamplingPeriod();
DrawFlameGraphHeader( m_flameGraphViewStart, m_flameGraphViewEnd, period );
DrawFlameGraphHorizontalPosition( m_flameGraphViewStart, m_flameGraphViewEnd, zsz, period );
ClampFlameGraphViewport( m_flameGraphViewStart, m_flameGraphViewEnd, zsz, ImGui::GetContentRegionAvail().x );
ImGui::BeginChild( "##flameGraphBody", ImVec2( 0, 0 ), false, ImGuiWindowFlags_NoScrollWithMouse );
const auto region = ImGui::GetContentRegionAvail();