### Install dxf-writer with npm

Source: https://github.com/tarikjabiri/js-dxf/blob/master/README.md

Installs the dxf-writer package using npm. This is the primary method for adding the library to a Node.js project.

```bash
npm install dxf-writer
```

--------------------------------

### Node.js DXF Drawing Example

Source: https://github.com/tarikjabiri/js-dxf/blob/master/README.md

Demonstrates how to create a DXF drawing in Node.js. It shows setting units, drawing text, adding layers, and saving the drawing to a file.

```javascript
const Drawing = require('dxf-writer');
const fs = require('fs');

let d = new Drawing();

d.setUnits('Decimeters');
d.drawText(10, 0, 10, 0, 'Hello World'); // draw text in the default layer named "0"
d.addLayer('l_green', Drawing.ACI.GREEN, 'CONTINUOUS');
d.setActiveLayer('l_green');
d.drawText(20, -70, 10, 0, 'go green!');

//or fluent
d.addLayer('l_yellow', Drawing.ACI.YELLOW, 'DOTTED')
 .setActiveLayer('l_yellow')
 .drawCircle(50, -30, 25);

fs.writeFileSync(__filename + '.dxf', d.toDxfString());
```

--------------------------------

### Drawing DXF with js-dxf

Source: https://github.com/tarikjabiri/js-dxf/blob/master/examples/browser/index.html

This snippet demonstrates the core functionality of the js-dxf library. It shows how to initialize a drawing, set units, add layers with specific colors and linetypes, set the active layer, draw text at specified coordinates, and draw circles. It also illustrates fluent API chaining for adding layers, setting active layers, and drawing shapes.

```javascript
var Drawing = require('Drawing');

window.onload = function() {
  d = new Drawing();
  d.setUnits('Decimeters');
  d.drawText(10, 0, 10, 0, 'Hello World'); // draw text in the default layer named "0"
  d.addLayer('l_green', Drawing.ACI.GREEN, 'CONTINUOUS');
  d.setActiveLayer('l_green');
  d.drawText(20, -70, 10, 0, 'go green!'); //or fluent
  d.addLayer('l_yellow', Drawing.ACI.YELLOW, 'DASHED')
    .setActiveLayer('l_yellow')
    .drawCircle(50, -30, 25);

  var b = new Blob([d.toDxfString()], {type: 'application/dxf'});
  document.getElementById('dxf').href = URL.createObjectURL(b);
}
```

```javascript
let d = new Drawing();

d.setUnits('Decimeters');
d.drawText(10, 0, 10, 0, 'Hello World'); // draw text in the default layer named "0"
d.addLayer('l_green', Drawing.ACI.GREEN, 'CONTINUOUS');
d.setActiveLayer('l_green');
d.drawText(20, -70, 10, 0, 'go green!');

//or fluent
d.addLayer('l_yellow', Drawing.ACI.YELLOW, 'DASHED')
  .setActiveLayer('l_yellow')
  .drawCircle(50, -30, 25);
```

--------------------------------

### Create and Draw Spline in DXF

Source: https://github.com/tarikjabiri/js-dxf/blob/master/examples/browser/spline.html

This snippet shows how to instantiate the Drawing object, draw a spline using control points, and prepare the DXF data for download. It utilizes the Drawing library to generate DXF content.

```javascript
var Drawing = require('Drawing');

window.onload = function() {
  d = new Drawing();
  // d.drawText(10, 0, 10, 0, 'Hello World'); // draw text in the default layer named "0"
  // d.addLayer('l_green', Drawing.ACI.GREEN, 'CONTINUOUS'); // d.setActiveLayer('l_green');
  d.drawSplineFromControlPoints([[0, 0], [50, 10,], [100,0]])
  var b = new Blob([d.toDxfString()], {type: 'application/dxf'});
  document.getElementById('dxf').href = URL.createObjectURL(b);
}
```

```javascript
let d = new Drawing();

d.drawSplineFromControlPoints([[0, 0], [50, 10,], [100,0]])
var b = new Blob([d.toDxfString()], {type: 'application/dxf'});
document.getElementById('dxf').href = URL.createObjectURL(b);
```

--------------------------------

### SVG Initialization and Drawing Functions

Source: https://github.com/tarikjabiri/js-dxf/blob/master/examples/browser/editor/index.html

Initializes the SVG canvas and provides functions to draw lines and circles. It uses the SVG.js library to create and manipulate SVG elements. The drawing functions allow for basic attributes like stroke and fill to be set.

```javascript
var svg, sheet, width=600, height=600;
var Drawing = require('Drawing');
window.addEventListener('load', function(){
  sheet = document.getElementById('sheet');
  svg = SVG(sheet).size(width, height)
})

function drawLine() {
  svg.line().draw().attr('fill','none').attr('stroke', '#000000')
}

function drawCircle() {
  svg.circle().draw().attr('fill','none').attr('stroke', '#000000')
}
```

--------------------------------

### js-dxf Editor HTML and CSS

Source: https://github.com/tarikjabiri/js-dxf/blob/master/examples/browser/editor/index.html

Defines the basic structure and styling for the js-dxf editor. It sets margins, defines the editor container, toolbar, and sheet, and includes hover effects for SVG elements.

```html
js-dxf editor body, html { margin: 0; height: 100%; display: grid; } #editor { margin: auto; } #editor .toolbar{ background-color:aqua; padding: 0.2em; } #editor .toolbar a{ float:right; } #sheet { border:1px solid green; }
```

```css
line:hover, circle:hover { stroke: red; }
```

--------------------------------

### Coordinate Transformation and DXF Conversion

Source: https://github.com/tarikjabiri/js-dxf/blob/master/examples/browser/editor/index.html

Contains utility functions for transforming SVG coordinates to DXF coordinates and a function to convert the SVG drawing to DXF format. It iterates through SVG line and circle elements, extracts their attributes, transforms coordinates, and uses the Drawing module to generate the DXF string.

```javascript
function getX(el, att) {
  return parseInt(el.getAttribute(att)) - width/2;
}

function getY(el, att) {
  return height/2 - parseInt(el.getAttribute(att))
}

function toDxf() {
  d = new Drawing();
  for(var line of Array.from(svg.node.getElementsByTagName('line'))) {
    d.drawLine(getX(line,'x1'), getY(line,'y1'), getX(line,'x2'), getY(line, 'y2'))
  }
  for(var circle of Array.from(svg.node.getElementsByTagName('circle'))) {
    d.drawCircle(getX(circle, 'cx'), getY(circle, 'cy'), circle.getAttribute('r'))
  }
  var b = new Blob([d.toDxfString()], {type: 'application/dxf'});
  document.getElementById('toDxf').href = URL.createObjectURL(b);
}
```

--------------------------------

### Add Custom Line Type

Source: https://github.com/tarikjabiri/js-dxf/blob/master/README.md

Shows how to define and add a custom line type to the DXF drawing. This allows for more complex line styles beyond the defaults.

```javascript
let d = new Drawing();
d.addLineType('DASHDOT', '_ . _ ', [0.5, -0.5, 0.0, -0.5]);
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.