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49 lines
1.2 KiB
Markdown
49 lines
1.2 KiB
Markdown
# shape_trapezium
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Returns shape points of an isosceles trapezoid. 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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- `length` : The base length of an isosceles trapezium. It also accepts a vector `[a, b]`. `a` is the bottom base and `b` is the top base.
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- `h` : The height of the isosceles trapezium.
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- `corner_r` : The circle radius which fits the edges of the bottom and the top.
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- `$fa`, `$fs`, `$fn` : Used to control the corner fragments. 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_trapezium.scad>
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polygon(
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shape_trapezium([40, 20],
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h = 20,
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corner_r = 2)
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);
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use <shape_trapezium.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_trapezium(
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[40, 20],
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h = 20,
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corner_r = 2
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);
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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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