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mathplot.cpp: optimize a plot function to have a better look for dashed lines, 

and less lines to plot when they can be merged.
This commit is contained in:
jean-pierre charras 2020-08-24 18:40:38 +02:00
parent fd4fb61acc
commit d1e2b57d96
1 changed files with 31 additions and 4 deletions
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35
common/widgets/mathplot.cpp
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@ -688,8 +688,12 @@ void mpFXY::Plot( wxDC& dc, mpWindow& w )
int dupx0 = 0; // count of currently merged vertical lines
wxPoint line_start; // starting point of the current line to draw
// Note: we do not use dc.DrawLines(), because at least on Windows
// dc.DrawLine() is faster, and dc.DrawLines() can hang for a lot
// A buffer to store coordinates of lines to draw
std::vector<wxPoint>pointList;
pointList.reserve( endPx - startPx + 1 );
// Note: we can use dc.DrawLines() only for a reasonable number or points (<10000),
// because at least on Windows dc.DrawLines() can hang for a lot of points.
// (> 10000 points) (can happens when a lot of points is calculated)
// To avoid long draw time (and perhaps hanging) one plot only not redundant lines.
// To avoid artifacts when skipping points to the same x coordinate, for each
@ -716,8 +720,7 @@ void mpFXY::Plot( wxDC& dc, mpWindow& w )
ymin0 = ymax0 = y1;
dupx0 = 0;
if( count )
dc.DrawLine( line_start, wxPoint( x1, y1 ) );
pointList.emplace_back( wxPoint( x1, y1 ) );
line_start.x = x1;
line_start.y = y1;
@ -732,6 +735,30 @@ void mpFXY::Plot( wxDC& dc, mpWindow& w )
}
}
}
if( pointList.size() > 1 )
{
// For a better look (when using dashed lines) and more optimization,
// try to merge horizontal segments, in order to plot longer lines
// we are merging horizontal segments because this is easy,
// and horizontal segments are a frequent cases
std::vector<wxPoint> drawPoints;
drawPoints.reserve( endPx - startPx + 1 );
drawPoints.push_back( pointList[0] ); // push the first point in list
for( size_t ii = 1; ii < pointList.size()-1; ii++ )
{
if( pointList[ii-1].y == pointList[ii].y )
continue;
else
drawPoints.push_back( pointList[ii] );
}
drawPoints.push_back( pointList.back() ); // push the last point in list
dc.DrawLines( drawPoints.size(), &drawPoints[0] );
}
}
if( !m_name.IsEmpty() && m_showName )