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Optimize drawing zig-zags.

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This commit is contained in:
Bartosz Taudul 2020-02-10 22:53:59 +01:00
parent ad3aa73085
commit eff040dca6
1 changed files with 30 additions and 22 deletions
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52
server/TracyView.cpp
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@ -1797,29 +1797,37 @@ static uint32_t DarkenColor( uint32_t color )
static void DrawZigZag( ImDrawList* draw, const ImVec2& wpos, double start, double end, double h, uint32_t color, float thickness = 1.f )
{
int mode = 0;
while( start < end )
const auto spanSz = end - start;
const auto h05 = round( h * 0.5 );
if( spanSz <= h05 )
{
double step = std::min( end - start, mode == 0 ? h/2 : h );
switch( mode )
{
case 0:
draw->AddLine( wpos + ImVec2( start, 0 ), wpos + ImVec2( start + step, round( -step ) ), color, thickness );
mode = 1;
break;
case 1:
draw->AddLine( wpos + ImVec2( start, round( -h/2 ) ), wpos + ImVec2( start + step, round( step - h/2 ) ), color, thickness );
mode = 2;
break;
case 2:
draw->AddLine( wpos + ImVec2( start, round( h/2 ) ), wpos + ImVec2( start + step, round( h/2 - step ) ), color, thickness );
mode = 1;
break;
default:
assert( false );
break;
};
start += step;
draw->AddLine( wpos + ImVec2( start, 0 ), wpos + ImVec2( start + spanSz, round( -spanSz ) ), color, thickness );
return;
}
draw->AddLine( wpos + ImVec2( start, 0 ), wpos + ImVec2( start + h05, -h05 ), color, thickness );
start += h05;
const auto h2 = h*2;
int steps = int( ( end - start ) / h2 );
while( steps-- )
{
draw->AddLine( wpos + ImVec2( start, -h05 ), wpos + ImVec2( start + h, h05 ), color, thickness );
draw->AddLine( wpos + ImVec2( start + h, h05 ), wpos + ImVec2( start + h2, -h05 ), color, thickness );
start += h2;
}
if( end - start <= h )
{
const auto span = end - start;
draw->AddLine( wpos + ImVec2( start, -h05 ), wpos + ImVec2( start + span, round( span - h*0.5 ) ), color, thickness );
}
else
{
draw->AddLine( wpos + ImVec2( start, -h05 ), wpos + ImVec2( start + h, h05 ), color, thickness );
const auto span = end - start - h;
draw->AddLine( wpos + ImVec2( start + h, h05 ), wpos + ImVec2( start + h + span, round( h*0.5 - span ) ), color, thickness );
}
}