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https://github.com/nophead/NopSCADlib.git
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added dimensions
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Alex Verschoot
157
utils/dimension.scad
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157
utils/dimension.scad
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//
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// NopSCADlib Copyright Chris Palmer 2018
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// nop.head@gmail.com
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// hydraraptor.blogspot.com
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//
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// This file is part of NopSCADlib.
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//
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// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
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// GNU General Public License as published by the Free Software Foundation, either version 3 of
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// the License, or (at your option) any later version.
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//
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// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along with NopSCADlib.
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// If not, see <https://www.gnu.org/licenses/>.
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//
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//
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//! Annotation used in this documentation
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//
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include <../utils/core/core.scad>
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include <../utils/maths.scad>
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//if text is empty, will display the number value
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//text_plane is either "XY" or "XZ"
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module dimension(startpoint, endpoint, text = "", thickness = 0.1) {
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// Compute vector between points
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direction = endpoint - startpoint;
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length = norm(direction);
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midpoint = (startpoint + endpoint) / 2;
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// Ensure nonzero values for calculations
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dir_xy = norm([direction.x, direction.y]);
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// Compute rotation angles safely
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//azimuth = (dir_xy == 0) ? 0 : atan2(direction.y, direction.x);
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azimuth = atan2(direction.y, direction.x);
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/*elevation = (direction.x == 0 && direction.y == 0)
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? ((direction.z > 0) ? -90 : 90)
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: -atan2(direction.z, dir_xy);*/
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elevation = -atan2(direction.z, dir_xy);
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// Draw measurement line as a thin cylinder
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translate(midpoint)
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rotate([0, elevation, azimuth])
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rotate([0, 90, 0])
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cylinder(d = thickness, h = length - thickness * 2, center = true);
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// Draw endpoint markers
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translate(startpoint)
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rotate([0, elevation - 90, azimuth])
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translate([0, 0, -thickness * 4])
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cylinder(h = thickness * 4, r1 = thickness * 2, r2 = 0);
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translate(endpoint)
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rotate([0, elevation + 90, azimuth])
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translate([0, 0, -thickness * 4])
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cylinder(h = thickness * 4, r1 = thickness * 2, r2 = 0);
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// Draw the text/distance
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dir = (length > 0) ? (direction / length) * thickness * 4 : [1, 0, 0];
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up_dir = rotate_vector_3d([0,1,0], [0,0,1] ,azimuth);
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translate(midpoint + up_dir*0.66)
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rotate([0, elevation, azimuth])
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linear_extrude(thickness)
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text(text == "" ? str(length) : text, size = thickness * 5, valign = "center", halign = "center");
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}
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//offset will detirmine how much space is between the measured point and the dimension
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//for x, this offset will be in the y direction
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module dimension_x(startpoint, endpoint, offset = 1, text = "", thickness = 0.1) {
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y = max(startpoint.y, endpoint.y) + offset;
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z = max(startpoint.z, endpoint.z) ;
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dimension([startpoint.x, y, z], [endpoint.x, y, z], text, thickness);
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v1= [startpoint.x, y, z]-startpoint;
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h1 = norm(v1);
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axis1 = cross([0,0,1], v1);
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angle1 = atan2(norm(axis1), v1.z);
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translate(startpoint)
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rotate(angle1, axis1)
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cylinder( h= h1+thickness*2, d=thickness);
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v2= [endpoint.x, y, z]-endpoint;
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h2 = norm(v2);
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axis2 = cross([0,0,1], v2);
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angle2 = atan2(norm(axis2), v2.z);
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translate(endpoint)
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rotate(angle2, axis2)
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cylinder( h= h2+thickness*2, d=thickness);
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}
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//offset will detirmine how much space is between the measured point and the dimension
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//for y, this offset will be in the x direction
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module dimension_y(startpoint, endpoint, offset = 1, text = "", thickness = 0.1) {
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x = max(startpoint.x, endpoint.x) + offset;
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z = max(startpoint.z, endpoint.z) ;
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dimension([x, startpoint.y, z], [x, endpoint.y, z], text, thickness);
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v1= [x, startpoint.y, z]-startpoint;
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h1 = norm(v1);
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axis1 = cross([0,0,1], v1);
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angle1 = atan2(norm(axis1), v1.z);
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translate(startpoint)
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rotate(angle1, axis1)
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cylinder( h= h1+thickness*2, d=thickness);
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v2= [x, endpoint.y, z]-endpoint;
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h2 = norm(v2);
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axis2 = cross([0,0,1], v2);
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angle2 = atan2(norm(axis2), v2.z);
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translate(endpoint)
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rotate(angle2, axis2)
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cylinder( h= h2+thickness*2, d=thickness);
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}
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//offset will detirmine how much space is between the measured point and the dimension
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//for z, this offset will be in the x direction
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module dimension_z(startpoint, endpoint, offset = 1, text = "", thickness = 0.1) {
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x = max(startpoint.x, endpoint.x) + offset;
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y = max(startpoint.y, endpoint.y) ;
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dimension([x, y, startpoint.z], [x, y, endpoint.z], text, thickness);
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v1= [x, y, startpoint.z]-startpoint;
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h1 = norm(v1);
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axis1 = cross([0,0,1], v1);
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angle1 = atan2(norm(axis1), v1.z);
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translate(startpoint)
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rotate(angle1, axis1)
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cylinder( h= h1+thickness*2, d=thickness);
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v2= [x, y, endpoint.z]-endpoint;
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h2 = norm(v2);
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axis2 = cross([0,0,1], v2);
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angle2 = atan2(norm(axis2), v2.z);
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translate(endpoint)
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rotate(angle2, axis2)
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cylinder( h= h2+thickness*2, d=thickness);
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}
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@@ -191,3 +191,32 @@ function cubic_real_roots(a, b, c, d) = //! Returns real roots of cubic equation
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function path_length(path, i = 0, length = 0) = //! Calculated the length along a path
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i >= len(path) - 1 ? length
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: path_length(path, i + 1, length + norm(path[i + 1] - path[i]));
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function rotate_vector_2d(v, angle) = [
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v[0] * cos(angle) - v[1] * sin(angle),
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v[0] * sin(angle) + v[1] * cos(angle)
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];
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function rotate_vector_2d(v, angle) = [
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v[0] * cos(angle) - v[1] * sin(angle),
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v[0] * sin(angle) + v[1] * cos(angle)
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];
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function rotation_matrix(axis, angle) = let(
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u = axis / norm(axis), // Normalize axis
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ux = u[0], uy = u[1], uz = u[2],
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cosA = cos(angle), sinA = sin(angle),
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one_minus_cosA = 1 - cosA
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) [
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[cosA + ux*ux*one_minus_cosA, ux*uy*one_minus_cosA - uz*sinA, ux*uz*one_minus_cosA + uy*sinA],
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[uy*ux*one_minus_cosA + uz*sinA, cosA + uy*uy*one_minus_cosA, uy*uz*one_minus_cosA - ux*sinA],
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[uz*ux*one_minus_cosA - uy*sinA, uz*uy*one_minus_cosA + ux*sinA, cosA + uz*uz*one_minus_cosA]
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];
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function rotate_vector_3d(v, axis, angle) = let(
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mat = rotation_matrix(axis, angle)
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) [
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mat[0][0]*v[0] + mat[0][1]*v[1] + mat[0][2]*v[2],
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mat[1][0]*v[0] + mat[1][1]*v[1] + mat[1][2]*v[2],
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mat[2][0]*v[0] + mat[2][1]*v[1] + mat[2][2]*v[2]
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];
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