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mathplot.cpp: fix an issue in plot function optimization.

This commit is contained in:
jean-pierre charras 2020-08-25 09:59:11 +02:00
parent 35eda030a2
commit d122321162
1 changed files with 14 additions and 5 deletions
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19
common/widgets/mathplot.cpp
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@ -712,9 +712,13 @@ void mpFXY::Plot( wxDC& dc, mpWindow& w )
{
if( !count || line_start.x != x1 )
{
if( dupx0 > 1 ) // Vertical points are merged,
// draw the pending vertical line
if( count && dupx0 > 1 && ymin0 != ymax0 )
{
// Vertical points are merged, draw the pending vertical line
// However, if the line is one pixel length, it is not drawn,
// because the main trace show this point
dc.DrawLine( x0, ymin0, x0, ymax0 );
}
x0 = x1;
ymin0 = ymax0 = y1;
@ -728,9 +732,9 @@ void mpFXY::Plot( wxDC& dc, mpWindow& w )
}
else
{
// "Merge" points on a vertical line at x0:
ymin0 = std::min( ymin0, y1 );
ymax0 = std::max( ymax0, y1 );
x0 = x1;
dupx0++;
}
}
@ -749,13 +753,18 @@ void mpFXY::Plot( wxDC& dc, mpWindow& w )
for( size_t ii = 1; ii < pointList.size()-1; ii++ )
{
if( pointList[ii-1].y == pointList[ii].y )
// Skip intermediate points between the first point and the last
// point of the segment candidate
if( drawPoints.back().y == pointList[ii].y &&
drawPoints.back().y == pointList[ii+1].y )
continue;
else
drawPoints.push_back( pointList[ii] );
}
drawPoints.push_back( pointList.back() ); // push the last point in list
// push the last point to draw in list
if( drawPoints.back() != pointList.back() )
drawPoints.push_back( pointList.back() );
dc.DrawLines( drawPoints.size(), &drawPoints[0] );
}