shape_trapezium

傳回等腰梯形的座標點，可以與我的 xxx_extrude 模組或者是內建的 polygon 結合使用。

參數

• length : 等腰梯形的底長度，或者是 [a, b] 形式，a 為下底，b 為上底。
• h : 梯形的高。
• corner_r : 圓角的半徑。
• $fa, $fs, $fn : 用來控制圓角，詳見 circle 模組說明。

範例

include <shape_trapezium.scad>;

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

include <shape_trapezium.scad>;
include <rotate_p.scad>;
include <polysections.scad>;
include <path_extrude.scad>;
include <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);