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improve snapping algorithm by leejjoon · Pull Request #726 · matplotlib/matplotlib · GitHub

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improve snapping algorithm #726

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leejjoon wants to merge 2 commits into from
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improve snapping algorithm #726

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f4f2a1a
improve snapping algorithm
leejjoon Feb 28, 2012
cbc5fed
add offset of 0.5 when marker is stroked so that snapping works bette…
leejjoon Feb 29, 2012
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2 changes: 1 addition & 1 deletion src/_backend_agg.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -660,7 +660,7 @@ RendererAgg::draw_markers(const Py::Tuple& args)
// Deal with the difference in y-axis direction
marker_trans *= agg::trans_affine_scaling(1.0, -1.0);
trans *= agg::trans_affine_scaling(1.0, -1.0);
trans *= agg::trans_affine_translation(0.0, (double)height);
trans *= agg::trans_affine_translation(0.5, (double)height+0.5);

PathIterator marker_path(marker_path_obj);
transformed_path_t marker_path_transformed(marker_path, marker_trans);
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4 changes: 2 additions & 2 deletions src/path_converters.h
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Expand Up @@ -494,8 +494,8 @@ class PathSnapper
code = m_source->vertex(x, y);
if (m_snap && agg::is_vertex(code))
{
*x = mpl_round(*x) + m_snap_value;
*y = mpl_round(*y) + m_snap_value;
*x = mpl_round(*x-m_snap_value) + m_snap_value;
*y = mpl_round(*y-m_snap_value) + m_snap_value;
}
return code;
}
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