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maxfreu avatar maxfreu commented on July 18, 2024 1

Makie.jl/CairoMakie/src/primitives.jl

Lines 785 to 795 in f92b260

if alpha(colors[i, j]) == 1
# sign.(p - center) gives the direction in which we need to
# extend the polygon. (Which may change due to rotations in the
# model matrix.) (i!=1) etc is used to avoid increasing the
# outer extent of the heatmap.
center = 0.25f0 * (p1 + p2 + p3 + p4)
p1 += sign.(p1 - center) .* Point2f(0.5f0 * (i!=1), 0.5f0 * (j!=1))
p2 += sign.(p2 - center) .* Point2f(0.5f0 * (i!=ni), 0.5f0 * (j!=1))
p3 += sign.(p3 - center) .* Point2f(0.5f0 * (i!=ni), 0.5f0 * (j!=nj))
p4 += sign.(p4 - center) .* Point2f(0.5f0 * (i!=1), 0.5f0 * (j!=nj))
end

here, right?

from makie.jl.

jkrumbiegel avatar jkrumbiegel commented on July 18, 2024

CairoMakie draws heatmap cells larger than they are so that you don't get background-colored artifacts at the seams. It should not draw them larger if the adjacent cells are not fully opaque, but maybe in your case the cells are even spanning across more than one neighbor, so they peek through. So we have to check that the overdrawing width is at most some fraction of the neighboring cell so that this cannot happen.

from makie.jl.

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