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43 lines
1.4 KiB
Markdown
43 lines
1.4 KiB
Markdown
# shape_arc
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Returns shape points of an arc shape. They 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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## Parameters
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- `radius` : The radius of the circle.
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- `angle` : A single value or a 2 element vector which defines the central angle. The first element of the vector is the beginning angle in degrees, and the second element is the ending angle.
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- `width_mode` : The default value is `"LINE_CROSS"`. The arc line will move outward by `width / 2` and inward by `width / 2`. If it's `"LINE_OUTWARD"`, The arc line moves outward by `width`. The `"LINE_INWARD"` moves the arc line inward by `width`.
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- `$fa`, `$fs`, `$fn` : Check [the circle module](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Using_the_2D_Subsystem#circle) for more details.
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## Examples
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use <shape_arc.scad>;
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shape_pts = shape_arc(radius = 10, angle = [-90, 90], width = 5);
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polygon(shape_pts);
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use <shape_arc.scad>;
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use <path_extrude.scad>;
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use <bezier_curve.scad>;
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t_step = 0.05;
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width = 2;
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shape_pts = shape_arc(radius = 10, angle = [180, 360], width = 5);
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p0 = [0, 0, 0];
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p1 = [40, 60, 35];
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p2 = [-50, 70, 45];
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p3 = [20, 150, 55];
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p4 = [80, 50, 60];
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path_pts = bezier_curve(t_step,
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[p0, p1, p2, p3, p4]
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);
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path_extrude(shape_pts, path_pts);
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