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fix: useless path collapsing for segments that are not start and end #1755

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@jguddas jguddas commented Mar 3, 2023

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Comment on lines +772 to +776
if (
params.removeUseless &&
!hasMarkerMid &&
(!maybeHasStrokeAndLinecap || !(isStart || isEnd))
) {
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hasRoundLinejoinAndLinecap from #1751 could also be included.

Suggested change
if (
params.removeUseless &&
!hasMarkerMid &&
(!maybeHasStrokeAndLinecap || !(isStart || isEnd))
) {
if (
params.removeUseless &&
!hasMarkerMid &&
(hasRoundLinejoinAndLinecap || !maybeHasStrokeAndLinecap || !(isStart || isEnd))
) {

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This doesn't make sense as these do fundamentally different things.
If it has a linecap, we can't remove segments off the end. We can only remove segments in between.
If it doesn't have a linecap, we can remove all useless segments.
What you're proposing is that if it has a round linejoin, we can change M5 5h0 to nothing. That would cause incorrect behavior, because the original shows up as a dot.

*I would personally write this as maybeHasStrokeAndLinecap ? !isStart && !isEnd : true as I find that way easier to read and understand, but style is personal.

if (params.removeUseless && !maybeHasStrokeAndLinecap) {
// l 0,0 / h 0 / v 0 / q 0,0 0,0 / t 0,0 / c 0,0 0,0 0,0 / s 0,0 0,0
// remove useless non-start/end path segments
var isStart = !path[index - 1] || path[index - 1].command === 'm';
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Shouldn't this be command === 'm', not testing if the previous one is m?

Comment on lines +772 to +776
if (
params.removeUseless &&
!hasMarkerMid &&
(!maybeHasStrokeAndLinecap || !(isStart || isEnd))
) {
Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

This doesn't make sense as these do fundamentally different things.
If it has a linecap, we can't remove segments off the end. We can only remove segments in between.
If it doesn't have a linecap, we can remove all useless segments.
What you're proposing is that if it has a round linejoin, we can change M5 5h0 to nothing. That would cause incorrect behavior, because the original shows up as a dot.

*I would personally write this as maybeHasStrokeAndLinecap ? !isStart && !isEnd : true as I find that way easier to read and understand, but style is personal.

// l 0,0 / h 0 / v 0 / q 0,0 0,0 / t 0,0 / c 0,0 0,0 0,0 / s 0,0 0,0
// remove useless non-start/end path segments
var isStart = !path[index - 1] || path[index - 1].command === 'm';
var isEnd = !path[index + 1] || path[index + 1].command === 'm';
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If I understand what I'm reading correctly, this current version doesn't remove move statements at the very end of the path, which are completely useless. It should.

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2 participants