hpgl | js library to communicate with HPGL-compatible plotters

by djipco JavaScript Version: 0.8.7-12 License: MIT

X-Ray Key Features Code Snippets Community Discussions(2)Vulnerabilities Install Support

kandi X-RAY | hpgl Summary

hpgl is a JavaScript library typically used in Internet of Things (IoT), Raspberry Pi, Arduino applications. hpgl has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can install using 'npm i hpgl' or download it from GitHub, npm.

The hpgl library makes it possible to interact with plotters that support the Hewlett-Packard Graphics Language (a.k.a. hpgl). This language is the de facto standard for most plotters.

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Quality

Security

License

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Support

hpgl has a low active ecosystem.

It has 23 star(s) with 3 fork(s). There are 4 watchers for this library.

It had no major release in the last 12 months.

There are 0 open issues and 3 have been closed. On average issues are closed in 28 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of hpgl is 0.8.7-12

Quality

hpgl has no bugs reported.

Security

hpgl has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

hpgl is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

hpgl releases are not available. You will need to build from source code and install.

Deployable package is available in npm.

Installation instructions, examples and code snippets are available.

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hpgl Key Features

No Key Features are available at this moment for hpgl.

hpgl Examples and Code Snippets

No Code Snippets are available at this moment for hpgl.

Community Discussions

Trending Discussions on hpgl

understand inkscape bezier flattening algorithm

libf2c.so.2 - main is undefined

QUESTION

understand inkscape bezier flattening algorithm

Asked 2018-Feb-21 at 00:01

Hello I'm working translating svg to hpgl format. and the plotter i use understand only the first version of hpgl that doesn't understand bezier curves. so i'm trying to convert the inkscape function that flattens the curves to line segment from python to javascript. There are 4 files that i'm reading and i'm kind of lost in all the math stuff. in the hpgle_encode.py there is a call to fucntion named cspsubdiv i think it stands for cubic super path sub division and from what i understood it is a recursive call that split every bezier cuvre in two (with De Casteljau's Algorithm) until the number of polyline is flat enough. this is determined by the distanceToPoint found in the ffgeom. What i don't understand is what c1 and c2 stand for and what mathematical concept are behind distance calculation of distance. also i don't understand the recursive part of the subdiv function. i could't debug the inkscape extension so i couldn't see what sp [i] represented in:

...

ANSWER

Answered 2018-Jan-09 at 13:52

The dot() function, in the code you linked to, is calculating the dot product of two vectors.

The dot product calculates the "scalar projection", or how much one vector projects along the length of another vector.

So if you have a line segment approximating a section of curve, and the bezier control points for that same section of curve, it should be fairly obvious how helpful this would be in calculating how close this line segment comes to approximating the curve.

The closer the control points are to the line segment, the more accurate the line segment is. When it gets to a predetermined closeness, you no longer need to use deCasteljau to split the curve into two smaller segments.

Source https://stackoverflow.com/questions/48160147

QUESTION

libf2c.so.2 - main is undefined

Asked 2017-Jul-30 at 22:14

I will try to be very specific and informative. I want to create a Dockerfile with all the packages that are used in geosciences for the good of the geospatial/geoscientific community. The Dockerfile is built on top of the scipy-notebook docker-stack.

The problem:

I am trying to build HPGL (a Python package for Geostatistics).

For the dependencies: I build some packages using apt-get and for those packages that I couldn't install via apt I downloaded the .deb packages. The Dockerfile below shows the steps for building all the HPGL dependencies:

...

ANSWER

Answered 2017-Jul-30 at 22:06

The solution:

I finally solved the problem by changing the dynamic library to the static library during the installation. HPGL is built using scons. From scons website:

SCons is an Open Source software construction tool (...) Configuration files are Python scripts

So I edited the SConstruct file in hpgl/src before calling scons to build HPGL.

Original SConstruct file from hpgl/src:

Source https://stackoverflow.com/questions/45382324

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install hpgl

To get started, you will need a few pieces of hardware:. Your plotter needs to be set to a line speed of 9600 baud with 8-N-1 settings. Chances are high this is already the case. If not, you may need to adjust some dip switches on your device. Refer to the manufacturers's documentation.
HPGL-compatible plotter with a serial interface;
USB-to-Serial adapter (unless your computer has a serial port);
Male DB-25 to female DB-9 cable (a.k.a. null modem cable);
Pens that fit your plotter;
Paper.

Support

I will try to maintain an up-to-date API documentation. A good place to start is the Plotter class. If you find errors, please file an issue on GitHub.

Find more information at: