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https://github.com/JustinSDK/dotSCAD.git
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@@ -1,6 +1,6 @@
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use <util/has.scad>;
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function _px_contour_corner_value(pts, x, y) =
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function _vx_contour_corner_value(pts, x, y) =
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let(
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c1 = has(pts, [x, y - 1], sorted = true) || has(pts, [x - 1, y - 1], sorted = true) ? 1 : 0,
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c2 = has(pts, [x - 1, y], sorted = true) || has(pts, [x - 1, y + 1], sorted = true) ? 2 : 0,
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@@ -9,27 +9,27 @@ function _px_contour_corner_value(pts, x, y) =
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)
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c1 + c2 + c3 + c4;
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_px_contour_dir_table = [
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_vx_contour_dir_table = [
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[4, 0], [6, 0], [7, 0], // RIGHT
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[8, 1], [12, 1], [14, 1], // DOWN
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[2, 2], [3, 2], [11, 2], // UP
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[1, 3], [9, 3], [13, 3] // LEFT
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];
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function _px_contour_dir(cr_value) =
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lookup(cr_value, _px_contour_dir_table);
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function _vx_contour_dir(cr_value) =
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lookup(cr_value, _vx_contour_dir_table);
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_px_contour_nxt_offset = [
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_vx_contour_nxt_offset = [
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[1, 0], // RIGHT
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[0, -1], // DOWN
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[0, 1], // UP
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[-1, 0] // LEFT
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];
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function _px_contour_travel(pts, p, fst) =
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function _vx_contour_travel(pts, p, fst) =
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let(
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dir_i = _px_contour_dir(_px_contour_corner_value(pts, p[0], p[1])),
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nxt_p = p + _px_contour_nxt_offset[dir_i]
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dir_i = _vx_contour_dir(_vx_contour_corner_value(pts, p[0], p[1])),
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nxt_p = p + _vx_contour_nxt_offset[dir_i]
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)
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nxt_p == fst ? [p] :
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concat(
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[p], _px_contour_travel(pts, nxt_p, fst)
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[p], _vx_contour_travel(pts, nxt_p, fst)
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);
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@@ -1,27 +1,27 @@
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use <pixel/px_circle.scad>;
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use <pixel/px_polyline.scad>;
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use <voxel/vx_circle.scad>;
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use <voxel/vx_polyline.scad>;
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use <shape_pentagram.scad>;
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use <hull_polyline2d.scad>;
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use <experimental/px_contour.scad>;
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use <experimental/vx_contour.scad>;
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pts = px_circle(10, true);
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pts = vx_circle(10, true);
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for(p = pts) {
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translate(p)
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square(1, center = true);
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}
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#hull_polyline2d(px_contour(pts), width = .1);
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#hull_polyline2d(vx_contour(pts), width = .1);
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pentagram = [
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for(pt = shape_pentagram(15))
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[round(pt[0]), round(pt[1])]
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];
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pts2 = px_polyline(concat(pentagram, [pentagram[0]]));
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pts2 = vx_polyline(concat(pentagram, [pentagram[0]]));
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translate([30, 0]) {
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for(pt = pts2) {
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translate(pt)
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linear_extrude(1, scale = 0.5)
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square(1, center = true);
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}
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#hull_polyline2d(px_contour(pts2), width = .1);
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#hull_polyline2d(vx_contour(pts2), width = .1);
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}
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@@ -1,10 +1,10 @@
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use <experimental/_impl/_px_contour_impl.scad>;
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use <experimental/_impl/_vx_contour_impl.scad>;
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use <util/sort.scad>;
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function px_contour(points) =
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function vx_contour(points) =
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let(
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// always start from the left-bottom pt
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sortedXY = sort(points, by = "vt"),
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fst = sortedXY[0] + [-1, -1]
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)
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_px_contour_travel(sortedXY, fst, fst);
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_vx_contour_travel(sortedXY, fst, fst);
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