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Sequencer - Computation for the display

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Various metrics to use along with zoom levels and all that shit. Mostly
useless for now, except for a moving cursor.
This commit is contained in:
Emmanuel BENOîT 2017-11-21 12:27:23 +01:00
parent 3fd377699f
commit cb4849d89e
1 changed files with 65 additions and 9 deletions
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74
syncview.cc
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@ -15,7 +15,7 @@ namespace {
struct T_SyncViewImpl_
{
static constexpr float SeqHeaderHeight = 24;
static constexpr float MinUnitWidth = 80;
static constexpr float BarWidth = 40;
const uint32_t ColFrame{ ImGui::GetColorU32( ImVec4{ 0 , 0 , 0 , .8 } ) };
const uint32_t ColHeader{ ImGui::GetColorU32( ImVec4{ .5 , .5 , .5 , .8 } ) };
@ -23,10 +23,13 @@ struct T_SyncViewImpl_
const uint32_t ColMain{ ImGui::GetColorU32( ImVec4{ .4 , .4 , .4 , .8 } ) };
float zoomLevel{ 1.f };
float startPos{ 100.895f };
bool followTime{ true };
bool display( ) noexcept;
void sequencerWidget( ) noexcept;
void sequencerHeader( ImRect const& bb ) noexcept;
void sequencerBody( ImRect const& bb ) noexcept;
};
@ -47,6 +50,11 @@ bool T_SyncViewImpl_::display( ) noexcept
return false;
}
PushItemWidth( 100 );
SliderFloat( "Zoom" , &zoomLevel , 0 , 1 , "%.2f" );
PopItemWidth( );
SameLine( );
PushID( "playing" );
if ( Button( sync.playing( ) ? "Stop" : "Play" ) ) {
sync.playing( ) = !sync.playing( ) && !sync.finished( );
@ -109,18 +117,51 @@ void T_SyncViewImpl_::sequencerWidget( ) noexcept
*/
auto& sync( Globals::Sync( ) );
const float innerWidth{ width - 2 };
const uint32_t units{ sync.durationUnits( ) };
const float maxZoomUnits{ width / MinUnitWidth };
const float slope{ maxZoomUnits - units };
const float dUnits{ units + zoomLevel * slope };
printf( "%d units ; %f/screen at max zoom ; slope %f ; display %f units at ZL %f\n" , units , maxZoomUnits , slope , dUnits , zoomLevel );
zoomLevel = ImSaturate( zoomLevel );
const float zoom1Pixels{ std::max( units * BarWidth , innerWidth ) };
const float totalPixels{ zoomLevel * ( zoom1Pixels - innerWidth ) + innerWidth };
const uint32_t totalBars{ [=](){
const float b{ std::max( std::min( totalPixels / BarWidth , float( units ) ) , 1.f ) };
const float mod{ fmod( b , 1.f ) };
return uint32_t( b + ( mod ? ( 1 - mod ) : 0 ) );
}() };
const float unitsPerBar{ float( units ) / totalBars };
const float barWidth{ totalPixels / totalBars };
const float absCursorPos{ sync.time( ) * totalPixels / sync.duration( ) };
if ( followTime ) {
const float dispUnits{ innerWidth * units / totalPixels };
const float uSize{ sync.durationUnitSize( ) };
const float endPos{ std::min( startPos + dispUnits , float( units ) ) };
startPos = endPos - dispUnits;
const float spp{ startPos * totalPixels / units };
const float epp{ endPos * totalPixels / units };
if ( absCursorPos < spp || absCursorPos > epp ) {
startPos = std::max( 0.f , sync.time( ) / uSize - unitsPerBar * .5f );
}
}
const float unadjustedStartPixel{ totalPixels * startPos / units };
if ( unadjustedStartPixel + innerWidth > totalPixels ) {
startPos = std::max( 0.f , totalPixels - innerWidth );
}
const float startPixel{ totalPixels * startPos / units };
const uint32_t startBar{ [=](){
const float b{ startPixel * totalBars / totalPixels };
const float mod{ fmod( b , 1.f ) };
return uint32_t( std::max( 0 , int32_t( b - ( mod ? mod : 1 ) ) ) );
}() };
const float startBarPos{ startBar * barWidth - startPixel };
const float cursorPos{ absCursorPos - startPixel };
printf( "Z: %f; P@zl1: %f; Pt: %f; Bt: %d; U/B: %f; Bw: %f; Sp: %f; Sb: %d, SbP: %f\n" , zoomLevel , zoom1Pixels , totalPixels , totalBars , unitsPerBar , barWidth , startPixel , startBar , startBarPos );
assert( startBarPos <= 0 );
assert( totalPixels >= innerWidth );
PushID( seqId );
BeginGroup( );
const auto hdrId{ win->GetID( "##header" ) };
const auto dspId{ win->GetID( "##display" ) };
auto* const dl( GetWindowDrawList( ) );
if ( ItemAdd( bbHeader , hdrId ) ) {
PushID( hdrId );
@ -128,9 +169,15 @@ printf( "%d units ; %f/screen at max zoom ; slope %f ; display %f units at ZL %f
PopID( );
}
if ( bbDisplay.Min.y < bbDisplay.Max.y && ItemAdd( bbDisplay , dspId ) ) {
// XXX display main area
dl->AddRectFilled( bbDisplay.Min , bbDisplay.Max ,
ImGui::GetColorU32( ImVec4( .4 , .4 , .4 , .8 ) ) );
PushID( dspId );
sequencerBody( bbDisplay );
PopID( );
}
if ( cursorPos >= 0 && cursorPos <= width ) {
auto* const dl( GetWindowDrawList( ) );
dl->AddLine( bbAll.Min + ImVec2{ cursorPos + 1 , 0 } ,
ImVec2{ bbAll.Min.x + cursorPos + 1 , bbAll.Max.y } ,
0xffffffff );
}
EndGroup( );
@ -156,6 +203,15 @@ void T_SyncViewImpl_::sequencerHeader(
PopFont( );
}
void T_SyncViewImpl_::sequencerBody(
ImRect const& bb ) noexcept
{
using namespace ImGui;
auto* const dl( GetWindowDrawList( ) );
dl->AddRectFilled( bb.Min , bb.Max , ColMain );
}
} // namespace
/*= T_SyncView =================================================================*/