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71 lines
1.8 KiB
Markdown
71 lines
1.8 KiB
Markdown
# shape_path_extend
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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.
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When using this function, you should use points to represent the 2D stroke.
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## Parameters
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- `stroke_pts` : A list of points represent a stroke. See the example below.
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- `path_pts` : A list of points represent the path.
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- `scale` : Scales the 2D shape by this value over the length of the extension.
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- `closed` : If the first point and the last point of `path_pts` has the same coordinate, setting `closed` to `true` will connect them automatically.
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## Examples
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use <shape_path_extend.scad>;
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use <shape_circle.scad>;
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use <archimedean_spiral.scad>;
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$fn = 96;
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stroke1 = [[-5, 2.5], [-2.5, 0], [0, 2.5], [2.5, 0], [5, 2.5]];
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path_pts1 = shape_circle(50, 60);
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polygon(
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shape_path_extend(stroke1, path_pts1)
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);
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stroke2 = [[-4, 0], [0, 4], [4, 0]];
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pts_angles = archimedean_spiral(
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arm_distance = 17,
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init_angle = 180,
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point_distance = 5,
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num_of_points = 85
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);
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translate([120, 0, 0])
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polygon(
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shape_path_extend(
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stroke2,
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[for(pa = pts_angles) pa[0]]
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)
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);
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use <bezier_curve.scad>;
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use <shape_path_extend.scad>;
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use <path_extrude.scad>;
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t_step = 0.1;
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width = 2;
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p0 = [0, 0];
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p1 = [40, 60];
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p2 = [50, 90];
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p3 = [0, 200];
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path = bezier_curve(t_step,
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[p0, p1, p2, p3]
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);
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stroke = [[-5, 2.5], [-2.5, 0], [0, 2.5], [2.5, 0], [5, 2.5]];
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path_extrude(
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shape_path_extend(stroke, path, scale = 5),
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path,
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scale = 0.1
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);
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