👉 https://editor.p5js.org/v3ga/collections/Q6wJic-1k
This repository presents programs written by french mathematician and computer scientist Jean-Paul Delahaye in the book "Nouveaux dessins géométriques et artistiques avec votre micro-ordinateur" published in 1985 for the Eyrolles french publishing house.
The programs were originally programmed with Microsoft Basic for Canon X-07 computer, outputs were drawn on a Canon X710 plotter. They were recoded with p5.js, the online collection can be found here. You can click on each thumb to jump to the corresponding sketch. Be sure to edit the DESSIN variable in the program header.
👉 You can find the recoded sketches of the first book "Dessins géométriques et artistiques avec votre micro-ordinateur" here : https://github.com/v3ga/dessins_geometriques_et_artistiques
👉 A big thank you to Jean-Noël Lafargue for having kindly sent to me the book and to Éric Schrafstetter for spotting bugs in some programs.
I contacted Jean-Paul Delahaye who gave me access to links for downloading scans of the two editions of “Dessins géométriques”. He kindly allowed me to share them.
👉 Dessins géométriques et artistiques avec votre micro-ordinateur
👉 Nouveaux dessins géométriques et artistiques avec votre micro-ordinateur
I tried to be as close as possible as the original syntax, thus I developed a parser that interprets the string generated by LPRINT commands.
The library contains the following command :
| Command | Description |
|---|---|
INIT |
set up the canvas with an initial size of 500x500 pixels, accepts {svg:true} as parameter to export to vector format |
INIT2(height) |
set up the canvas with the width equal to 500 pixels and a custom height, accepts {svg:true} as parameter to export to vector format |
INIT_WH(width,height) |
set up the canvas with custom width and height, accepts {svg:true} as parameter to export to vector format |
LPRINT(s) |
concatenates s to the OUTPUT global variable used by TRACE()for drawing |
TRACE() |
draw the output using beginShape / vertex / endShape commands by interpretating the string generated by LPRINT calls |
TRACE2() |
draw the output, endShape is not used with CLOSE parameter |
PALETTE(which) |
sets the palette, use RED,YELLOW, GREEN, NEW_BLUEor NEW_YELLOW as parameter. Defaults otherwise to grey background and black stroke |
Some sketches were added a translate command to center the drawing as it happened sometimes it was out of canvas bounds.
let DESSIN = 30;
let NP=480,PI=Math.PI;
let N=400;
function setup()
{
INIT();
for (let I = 0; I < N; I++) {
let X = R*cos(A), Y= R*sin(A);
let X_ = int(NP/2*(1+X)), Y_ = int(NP/2*(1+Y));
if (I == 0) LPRINT(`M${X_},${Y_}`);
if (I > 0) LPRINT(`D${X_},${Y_}`);
}
TRACE2();
}- 1. Motifs répétés
- 2. Des centaines de visages
- 3. Courbes en coordonnées polaires
- 4. Von Koch, Cantor et Tapis fractals
- 5. Champs
- 6. Transformations
- 7. Fractales générales
- 8. Moirages et cubes en dimension K
- 9. Dessins implicites
- 10. Fractales multivoques
- 11. Multitudes
