dotSCAD/docs/lib3x-shape_trapezium.md

shape_trapezium

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.

Parameters

• 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.
• h : The height of the isosceles trapezium.
• corner_r : The circle radius which fits the edges of the bottom and the top.
• $fa, $fs, $fn : Used to control the corner fragments. Check the circle module for more details.

Examples

use <shape_trapezium.scad>

polygon(
	shape_trapezium([40, 20], 
	h = 20,
	corner_r = 2)
);

use <shape_trapezium.scad>
use <path_extrude.scad>
use <bezier_curve.scad>

t_step = 0.05;
width = 2;

shape_pts = shape_trapezium(
	[40, 20], 
	h = 20, 
	corner_r = 2
);

p0 = [0, 0, 0];
p1 = [40, 60, 35];
p2 = [-50, 70, 45];
p3 = [20, 150, 55];
p4 = [80, 50, 60];

path_pts = bezier_curve(t_step, 
	[p0, p1, p2, p3, p4]
);

path_extrude(shape_pts, path_pts);