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Reworked bezier_offset()

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Revar Desmera 2019-06-24 02:18:37 -07:00
parent 2f6671e56d
commit 72c0922c13
1 changed files with 16 additions and 16 deletions
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beziers.scad
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@ -385,25 +385,24 @@ function bezier_close_to_axis(bezier, N=3, axis="X") =
// Function: bezier_offset() // Function: bezier_offset()
// Usage: // Usage:
// bezier_offset(inset, bezier, [N], [axis]); // bezier_offset(offset, bezier, [N], [axis]);
// Description: // Description:
// Takes a 2D bezier path and closes it with a matching reversed path that is closer to the given axis by distance `inset`. // Takes a 2D bezier path and closes it with a matching reversed path that is offset by the given `offset` [X,Y] distance.
// Arguments: // Arguments:
// inset = Amount to lower second path by. // offset = Amount to offset second path by.
// bezier = The 2D bezier path. // bezier = The 2D bezier path.
// N = The degree of the bezier curves. Cubic beziers have N=3. Default: 3 // N = The degree of the bezier curves. Cubic beziers have N=3. Default: 3
// axis = The axis to offset towards, "X", or "Y". Default: "X"
// Example(2D): // Example(2D):
// bez = [[50,30], [40,10], [10,50], [0,30], [-10, 10], [-30,10], [-50,20]]; // bez = [[50,30], [40,10], [10,50], [0,30], [-10, 10], [-30,10], [-50,20]];
// closed = bezier_offset(5, bez); // closed = bezier_offset([0,-5], bez);
// trace_bezier(closed, size=1); // trace_bezier(closed, size=1);
// Example(2D): // Example(2D):
// bez = [[30,50], [10,40], [50,10], [30,0], [10, -10], [10,-30], [20,-50]]; // bez = [[30,50], [10,40], [50,10], [30,0], [10, -10], [10,-30], [20,-50]];
// closed = bezier_offset(5, bez, axis="Y"); // closed = bezier_offset([-5,0], bez);
// trace_bezier(closed, size=1); // trace_bezier(closed, size=1);
function bezier_offset(inset, bezier, N=3, axis="X") = function bezier_offset(offset, bezier, N=3) =
let( let(
backbez = reverse([ for (pt = bezier) pt-(axis=="X"? [0,inset] : [inset,0]) ]), backbez = reverse([ for (pt = bezier) pt+offset ]),
bezend = len(bezier)-1 bezend = len(bezier)-1
) concat( ) concat(
bezier, bezier,
@ -457,7 +456,7 @@ module bezier_polygon(bezier, splinesteps=16, N=3) {
// scale = Relative size of top of extrusion to the bottom. default=1.0 // scale = Relative size of top of extrusion to the bottom. default=1.0
// slices = Number of vertical slices to use for twisted extrusion. default=20 // slices = Number of vertical slices to use for twisted extrusion. default=20
// center = If true, the extruded solid is centered vertically at z=0. // center = If true, the extruded solid is centered vertically at z=0.
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER` // anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `BOTTOM`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0` // spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0`
// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#orient). Default: `UP` // orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#orient). Default: `UP`
// Example: // Example:
@ -469,10 +468,10 @@ module bezier_polygon(bezier, splinesteps=16, N=3) {
// [ 25, -15], [-10, 0] // [ 25, -15], [-10, 0]
// ]; // ];
// linear_sweep_bezier(bez, height=20, splinesteps=32); // linear_sweep_bezier(bez, height=20, splinesteps=32);
module linear_sweep_bezier(bezier, height=100, splinesteps=16, N=3, center=undef, convexity=undef, twist=undef, slices=undef, scale=undef, anchor=UP, spin=0, orient=UP) { module linear_sweep_bezier(bezier, height=100, splinesteps=16, N=3, center=undef, convexity=undef, twist=undef, slices=undef, scale=undef, anchor=BOTTOM, spin=0, orient=UP) {
maxx = max([for (pt = bezier) abs(pt[0])]); maxx = max([for (pt = bezier) abs(pt[0])]);
maxy = max([for (pt = bezier) abs(pt[1])]); maxy = max([for (pt = bezier) abs(pt[1])]);
orient_and_anchor([maxx*2,maxy*2,height], orient, anchor, spin=spin, chain=true) { orient_and_anchor([maxx*2,maxy*2,height], orient, anchor, spin=spin, center=center, chain=true) {
linear_extrude(height=height, center=true, convexity=convexity, twist=twist, slices=slices, scale=scale) { linear_extrude(height=height, center=true, convexity=convexity, twist=twist, slices=slices, scale=scale) {
bezier_polygon(bezier, splinesteps=splinesteps, N=N); bezier_polygon(bezier, splinesteps=splinesteps, N=N);
} }
@ -491,7 +490,7 @@ module linear_sweep_bezier(bezier, height=100, splinesteps=16, N=3, center=undef
// bezier = array of 2D points for the bezier path to rotate. // bezier = array of 2D points for the bezier path to rotate.
// splinesteps = number of segments to divide each bezier segment into. default=16 // splinesteps = number of segments to divide each bezier segment into. default=16
// N = number of points in each bezier segment. default=3 (cubic) // N = number of points in each bezier segment. default=3 (cubic)
// convexity = max number of walls a line could pass through, for preview. default=10 // convexity = max number of walls a line could pass through, for preview. default=2
// angle = Degrees of sweep to make. Default: 360 // angle = Degrees of sweep to make. Default: 360
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER` // anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0` // spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0`
@ -505,7 +504,7 @@ module linear_sweep_bezier(bezier, height=100, splinesteps=16, N=3, center=undef
// [ 0, 10] // [ 0, 10]
// ]; // ];
// rotate_sweep_bezier(path, splinesteps=32, $fn=180); // rotate_sweep_bezier(path, splinesteps=32, $fn=180);
module rotate_sweep_bezier(bezier, splinesteps=16, N=3, convexity=10, angle=360, anchor=CENTER, spin=0, orient=UP) module rotate_sweep_bezier(bezier, splinesteps=16, N=3, convexity=undef, angle=360, anchor=CENTER, spin=0, orient=UP)
{ {
maxx = max([for (pt = bezier) abs(pt[0])]); maxx = max([for (pt = bezier) abs(pt[0])]);
maxy = max([for (pt = bezier) abs(pt[1])]); maxy = max([for (pt = bezier) abs(pt[1])]);
@ -525,13 +524,16 @@ module rotate_sweep_bezier(bezier, splinesteps=16, N=3, convexity=10, angle=360,
// Arguments: // Arguments:
// bezier = array of points for the bezier path to extrude along. // bezier = array of points for the bezier path to extrude along.
// splinesteps = number of segments to divide each bezier segment into. default=16 // splinesteps = number of segments to divide each bezier segment into. default=16
// N = The degree of the bezier path to extrude.
// convexity = max number of walls a line could pass through, for preview. default=2
// clipsize = Size of cube to use for clipping beveled ends with.
// Example(FR): // Example(FR):
// path = [ [0, 0, 0], [33, 33, 33], [66, -33, -33], [100, 0, 0] ]; // path = [ [0, 0, 0], [33, 33, 33], [66, -33, -33], [100, 0, 0] ];
// bezier_path_extrude(path) difference(){ // bezier_path_extrude(path) difference(){
// circle(r=10); // circle(r=10);
// fwd(10/2) circle(r=8); // fwd(10/2) circle(r=8);
// } // }
module bezier_path_extrude(bezier, splinesteps=16, N=3, convexity=10, clipsize=1000) { module bezier_path_extrude(bezier, splinesteps=16, N=3, convexity=undef, clipsize=1000) {
path = slice(bezier_polyline(bezier, splinesteps, N), 0, -1); path = slice(bezier_polyline(bezier, splinesteps, N), 0, -1);
path_extrude(path, convexity=convexity, clipsize=clipsize) children(); path_extrude(path, convexity=convexity, clipsize=clipsize) children();
} }
@ -567,7 +569,6 @@ module bezier_sweep_bezier(bezier, path, pathsteps=16, bezsteps=16, bezN=3, path
} }
// Module: trace_bezier() // Module: trace_bezier()
// Description: // Description:
// Renders 2D or 3D bezier paths and their associated control points. // Renders 2D or 3D bezier paths and their associated control points.
@ -653,7 +654,6 @@ function bezier_triangle_point(tri, u, v) =
bezier_triangle_point(u*Pu + v*Pv + (1-u-v)*Pw, u, v); bezier_triangle_point(u*Pu + v*Pv + (1-u-v)*Pw, u, v);
// Function: is_tripatch() // Function: is_tripatch()
// Description: // Description:
// Returns true if the given item is a triangular bezier patch. // Returns true if the given item is a triangular bezier patch.