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fix join-miter error

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Justin Lin
2022-05-04 10:17:34 +08:00
parent ccf77872ed
commit 61fef89bfd
1 changed files with 14 additions and 11 deletions
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23
src/polyline2d.scad
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@@ -34,8 +34,8 @@ module polyline2d(points, width = 1, startingStyle = "CAP_SQUARE", endingStyle =
p1Style = p1Style, p2Style = p2Style);
}
module joins(line, radius, i_end, i) {
if(i < i_end) {
module joins(line, radius, i_end, j) {
for(i = [j:i_end - 1]) {
p1 = line[i];
p2 = line[i + 1];
p3 = line[i + 2];
@@ -47,24 +47,27 @@ module polyline2d(points, width = 1, startingStyle = "CAP_SQUARE", endingStyle =
cosa = (v1 * v2) / normv1xv2;
sina = -c / normv1xv2;
translate(p2)
rotate(atan2(v1.y, v1.x) + (c > 0 ? -90 : asin(cosa))) {
if(joinStyle == "JOIN_ROUND") {
a = acos(cosa);
translate(p2)
rotate(90 + atan2(v1.y, v1.x))
{
if(joinStyle == "JOIN_ROUND") {
rotate(c > 0 ? 180 : -a)
pie(
radius = radius,
angle = [0, a],
$fn = fn * 360 / a
);
} else if(joinStyle == "JOIN_MITER") {
tana2 = sina / (1 + cosa); // tan(a / 2)
polygon(radius * [[0, 0], [1, 0], [1, tana2], [cosa, sina]]);
} else {
rotate(c > 0 ? 180 + a : -a)
if(joinStyle == "JOIN_MITER") {
polygon(radius * [[0, 0], [1, 0], [1, sina / (1 + cosa)], [cosa, sina]]);
} else { // "JOIN_BEVEL"
polygon(radius * [[0, 0], [1, 0], [cosa, sina]]);
}
}
joins(line, radius, i_end, i + 1);
}
}
}