Debugging script

[Ken]

I’ve become frustrated. I think JSCad may be to advanced an application for the average computer user. Here is a snippet:

const { polygon} = require('@jscad/modeling').primitives
const { extrudeRectangular, extrudeLinear, extrudeRotate } = require('@jscad/modeling').extrusions
const { offset,expand } = require('@jscad/modeling').expansions

let x =[[0,0],[-30,0],[-30,100],[40,100],[40,70],[0,70],[0,0]];

const v1 = polygon({ points: x})
const b1 = extrudeRectangular({height: .1 , size: 3}, v1)

const v2 = expand({ delta: -3, corners: 'edge', segments: 8 }, v1) // api indicates v2 should be another polygon
const b2 = extrudeRectangular({height: .1 , size: 3}, v2)

const main = () => {
//return v1 //ok
//return b1 //ok
//return v2 // looks ok, but I don't know how to examine the points
return b2 //breaks

}

module.exports = { main }

I installed JScad-now on Windows 10 and got about 4 warnings I do not understand. I can’t get it to work.

I use notepad++ and chrome, is there a better environment? How should an average user approach debugging? I didn’t see a console.log(polygon.toPoints()).

What I originally wanted to do is extrudeLinear a closed path with arcs and generate shapes to .round the base and top. The exstudefromslices examples are little to advanced.

Thanks,
Ken Swindell

I’ve become frustrated. I think JSCad may be to advanced an application for the average computer user. Here is a snippet:

const { polygon} = require('@jscad/modeling').primitives
const { extrudeRectangular, extrudeLinear, extrudeRotate } = require('@jscad/modeling').extrusions
const { offset,expand } = require('@jscad/modeling').expansions

let x =[[0,0],[-30,0],[-30,100],[40,100],[40,70],[0,70],[0,0]];

const v1 = polygon({ points: x})
const b1 = extrudeRectangular({height: .1 , size: 3}, v1)

const v2 = expand({ delta: -3, corners: 'edge', segments: 8 }, v1) // api indicates v2 should be another polygon
const b2 = extrudeRectangular({height: .1 , size: 3}, v2)

const main = () => {
//return v1 //ok
//return b1 //ok
//return v2 // looks ok, but I don't know how to examine the points
return b2 //breaks

}

module.exports = { main }

I installed JScad-now on Windows 10 and got about 4 warnings I do not understand. I can’t get it to work.

I use notepad++ and chrome, is there a better environment? How should an average user approach debugging? I didn’t see a console.log(polygon.toPoints()).

What I originally wanted to do is extrudeLinear a closed path with arcs and generate shapes to .round the base and top. The exstudefromslices examples are little to advanced.

Thanks,
Ken Swindell

[gilboonet]

Hello, you can get V2 points using :
console.log(v2.sides)

I'm running JSCAD using Firefox at https://openjscad.xyz/

[hrgdavor]

If you are starting in jscad and are interested in doing stuff with jscad in future join the discord channel too https://discord.gg/UXtQcA6

I am not sure what shape you are trying to get, but here is my guess based on a circle

the problem with offset function is that it may produce shapes that will make problems for you down the line

below is my attempt from some utility I have from some time ago. ... it works fr cylinder but if I use your poly v1 or v2

some parts are ok, some are fked up

const { expansions, primitives, maths, extrusions } = require('@jscad/modeling')
const { polygon , circle} = primitives
const { extrudeRectangular, extrudeLinear, extrudeRotate, extrudeFromSlices, slice } = extrusions
const { offset,expand } = expansions
const { mat4, line2, line3, vec2, vec3, vec4 } = maths

let x =[[0,0],[-30,0],[-30,100],[40,100],[40,70],[0,70],[0,0]].reverse();

const v1 = polygon({ points: x})
const b1 = extrudeRectangular({height: .1 , size: 3}, v1)

const v2 = expand({ delta: -3, corners: 'edge', segments: 8 }, v1) // api indicates v2 should be another polygon
const b2 = extrudeRectangular({height: .1 , size: 3}, v2)


const main = () => {
return extrudeChamfer({baseSlice:circle({radius:5}), h: 10, cut:1, corners:'round'})

//return v1 //ok
//return b1 //ok
return v2 // looks ok, but I don't know how to examine the points
return b2 //breaks

}

module.exports = { main }

const extrudeChamfer = ({baseSlice, h=10, cut=0, cutTop=0, cutBottom=0, tz=0, tx=0, ty=0}) => {
  cutTop = cutTop || cut;
  cutBottom = cutBottom || cut;
  let levels = [];
  
  if(cutBottom){
  	levels.push([0,-cutBottom]);
  	levels.push([cutBottom,0]); 
  }else{
  	levels.push([0,0]); 
  }
  
  levels.push([h-cutTop-cutBottom,0]); 
  
  if(cutTop){
	  levels.push([cutTop, -cutTop]); 
  }
  
  return extrudeLevels({levels, baseSlice, tz, tx, ty})
}

const extrudeLevels = ({levels, baseSlice, corners='edge', segments=16, tz=0, tx=0, ty=0}) => {
  let h = 0;
  return extrudeFromSlices({numberOfSlices:levels.length, callback:(progress, counter)=>{
    let level = levels[counter];
    h += level[0];

    base = offset({delta:level[1], corners, segments},baseSlice);
    // DIRTY FIX for what expand does to original geom
    if(level[1] > 0){
    	if(corners == 'round'){		
	    	for(let i=0; i<segments-1; i++){
		    	let tmp = base.sides.shift();
		    	base.sides.push(tmp);
	    	}
    	}else{
	    	let tmp = base.sides.pop();
	    	base.sides.unshift(tmp);
    	}
    }
    base = slice.fromSides(base.sides);
    return slice.transform(mat4.fromTranslation([],[0, 0, h+tz]), base);
  }});	
}

[z3dev]

@Ken Welcome!

You’ve come the the right place, and hopefully you get some help to progress along.

Here are a few hints to get you going.

Polygons (2D) are created using a series of points, but the order is VERY important. The points should create an outline which rotates counter clockwise about the Z axis. This will allow further functions to operate properly.

There’s a little section about the general orientation of shapes.

[Ken]

Thanks everyone for your response, I continue to experiment and learn. Once I switched to Foxfire I can see the debug results.

Thanks
Ken