56 lines
1.7 KiB
Diff
56 lines
1.7 KiB
Diff
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Subject: [PATCH] Allow arrows with zero length on arcs
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Use the tangent, not a secant, for short arrows on arcs.
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---
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fig2dev/bound.c | 9 ++++-----
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fig2dev/tests/output.at | 8 ++++++++
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2 files changed, 12 insertions(+), 5 deletions(-)
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diff --git a/fig2dev/bound.c b/fig2dev/bound.c
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index ce7f4d1..9e997b7 100644
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--- a/fig2dev/bound.c
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+++ b/fig2dev/bound.c
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@@ -1095,16 +1095,15 @@ compute_arcarrow_angle(double x1, double y1, double x2, double y2,
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r=sqrt(dx*dx+dy*dy);
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h = (double) arrow->ht;
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/* lines are made a little thinner in set_linewidth */
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- thick = (arrow->thickness <= THICK_SCALE) ?
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- 0.5* arrow->thickness :
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- arrow->thickness - THICK_SCALE;
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+ thick = arrow->thickness <= THICK_SCALE ?
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+ 0.5 * arrow->thickness : arrow->thickness - THICK_SCALE;
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/* lpt is the amount the arrowhead extends beyond the end of the line */
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lpt = thick/2.0/(arrow->wid/h/2.0);
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/* add this to the length */
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h += lpt;
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- /* radius too small for this method, use normal method */
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- if (h > 2.0*r) {
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+ /* secant would be too large or too small */
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+ if (h > 2.0*r || h < 0.01*r) {
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arc_tangent_int(x1,y1,x2,y2,direction,x,y);
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return;
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}
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diff --git a/fig2dev/tests/output.at b/fig2dev/tests/output.at
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index 79788cc..9150dbe 100644
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--- a/fig2dev/tests/output.at
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+++ b/fig2dev/tests/output.at
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@@ -175,6 +175,14 @@ AT_CHECK([fig2dev -L pict2e -P big1.fig big1.tex && \
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], 0, ignore)
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AT_CLEANUP
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+AT_SETUP([accept arc arrows with zero height, ticket #74])
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+AT_KEYWORDS(pict2e)
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+AT_CHECK([fig2dev -L pict2e <<EOF
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+FIG_FILE_TOP
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+5 1 0 1 0 7 50 -1 -1 0.0 0 0 1 0 0.0 0.0 600 0 0 600 -600 0
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+ 1 1 1.0 60.0 0.0
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+EOF], 0, ignore)
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+AT_CLEANUP
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AT_BANNER([Test svg output language.])
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AT_SETUP([compare patterns with template])
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--
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2.31.1
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