ExampleParameterModel

NPLCAD例子： 创建参数化模型

local bottom_length = 8;
local bottom_height = 2;
local bottom_width = 14;
local bottom_corner_radius = 2;
local bottom_hole_radius = 0.5;

local height = 15.5;
local backframe_thickness = 2;
local centerframe_thickness = 1;

local outer_radius = 3.5;
local inner_radius = 1.75;
local clinder_length = 6.5
local overflow = (outer_radius-inner_radius)*0.5

-- helper functions
-- @param zSide: [1,-1] if zSide==1, corner is positive z, -1 is negative z direction.
-- @param xSide: [1,-1] same as zSide. 
function CreateCorner(radius, height, zSide, xSide)
    push()
    color("red")
    difference()
        push()
            translate(-radius,0, -radius)
            cube({size={radius*2, height, radius*2}})
        pop()
        push()
            translate(xSide==1 and -radius*2 or 0,0, -radius)
            cube({size={radius*2, height, radius*2}})
        pop()
        push()
            translate(-radius,0, zSide==1 and -radius*2 or 0)
            cube({size={radius*2, height, radius*2}})
        pop()
        cylinder({r = radius, h=height})      
    pop()
end

-- Create the bottom of the widget
function CreateBottom()
    push()
    difference()
        push()
            translate(0, 0, -bottom_width/2)
            cube({size={bottom_length, bottom_height, bottom_width}})
        pop()
        for i=1, -1, -2 do
            push()
                translate(bottom_length - bottom_corner_radius, 0, (bottom_width/2-bottom_corner_radius)*i)
                CreateCorner(bottom_corner_radius, bottom_height, i, 1);
                cylinder({r = bottom_hole_radius, h=bottom_height})      
            pop()
        end
    pop()
end

-- create cross supporters
function CreateVerticalSupporters()
    -- back frame
    push()
        difference()
            push()
                translate(0, bottom_height, -bottom_width/2)
                cube({size={backframe_thickness, height-bottom_height-outer_radius+overflow, bottom_width}})
            pop()
            local slopeAngle = math.atan((bottom_width/2-outer_radius)/(height-bottom_height-outer_radius));

            push()
                translate(0, bottom_height, bottom_width/2)
                rotate({-slopeAngle*180/3.14, 0, 0});
                cube({size={backframe_thickness, height*2, bottom_width}})
            pop()
            push()
                translate(0, bottom_height, -bottom_width/2)
                rotate({slopeAngle*180/3.14, 0, 0});
                translate(0, 0, -bottom_width);
                cube({size={backframe_thickness, height*2, bottom_width}})
            pop()
            push()
                translate(0, height - outer_radius, 0)
                cylinder({from = {0,0,0}, to = {clinder_length,0,0}, r1 = outer_radius, r2 = outer_radius});
            pop()
    pop()
    -- center frame
    push()
        difference()
            push()
                translate(0, bottom_height, -centerframe_thickness/2)
                cube({size={bottom_length, height-bottom_height-outer_radius*2+overflow, centerframe_thickness}})
            pop()
            
            local slopeAngle = math.atan((bottom_length - clinder_length)/(height - bottom_height - outer_radius*2))
            push()
                translate(bottom_length, bottom_height, -centerframe_thickness/2)
                rotate({0,0,slopeAngle*180/3.14})
                cube({size={bottom_length, height-bottom_height, centerframe_thickness}})
            pop()
    pop()
end

function CreateCylinders()
    push()
        translate(0, height - outer_radius, 0)
        difference()
            cylinder({from = {0,0,0}, to = {clinder_length,0,0}, r1 = outer_radius, r2 = outer_radius});
            cylinder({from = {0,0,0}, to = {clinder_length,0,0}, r1 = inner_radius, r2 = inner_radius});
    pop()
end

union()
CreateBottom();
CreateVerticalSupporters();
CreateCylinders()

最终效果