shape_path_extend


It extends a 2D stroke along a path to create a 2D shape. This module is suitable for a path created by a continuous function. The returned points can be used with xxx_extrude modules of dotSCAD. The shape points can be also used with the built-in polygon module.

When using this function, you should use points to represent the 2D stroke.

It depends on the rotate_p function. Remember to include “rotate_p.scad”.

Parameters

  • stroke_pts : A list of points represent a stroke. See the example below.
  • path_pts : A list of points represent the path.
  • scale : Scales the 2D shape by this value over the length of the extension.
  • closed : If the first point and the last point of path_pts has the same coordinate, setting closed to true will connect them automatically.

Examples

include <rotate_p.scad>;
include <shape_path_extend.scad>;
include <circle_path.scad>;
include <archimedean_spiral.scad>;

$fn = 96;

stroke1 = [[-5, 2.5], [-2.5, 0], [0, 2.5], [2.5, 0], [5, 2.5]];
path_pts1 = circle_path(50, 60);
polygon(
    shape_path_extend(stroke1, path_pts1)
);


stroke2 = [[-4, 0], [0, 4], [4, 0]];
pts_angles = archimedean_spiral(
    arm_distance = 17,
    init_angle = 180,
    point_distance = 5,
    num_of_points = 85 
); 

translate([120, 0, 0]) 
    polygon(
        shape_path_extend(
            stroke2, 
            [for(pa = pts_angles) pa[0]]
        )
    );

shape_path_extend

include <rotate_p.scad>;
include <bezier_curve.scad>;
include <shape_path_extend.scad>;

include <polysections.scad>;
include <path_extrude.scad>;


t_step = 0.1;
width = 2;

p0 = [0, 0];
p1 = [40, 60];
p2 = [50, 90];
p3 = [0, 200];

path = bezier_curve(t_step, 
    [p0, p1, p2, p3]
);

stroke = [[-5, 2.5], [-2.5, 0], [0, 2.5], [2.5, 0], [5, 2.5]];

path_extrude(
    shape_path_extend(stroke, path, scale = 5), 
    path,
    scale = 0.1
);

shape_path_extend