improve p5 to gcode documentation

penplotting/README.md

@@ -143,11 +143,19 @@ One can change the size of the artwork by setting the density with `-d 32` (defa
 
 ### P5->SVG->GCDODE from the browser
 
+
 * [p5.js-svg](https://github.com/zenozeng/p5.js-svg) with [p5.js v1.5](https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.5.0/p5.js), as documented above
-* in p5.js, a canvas of ```h = 1053; w = 744``` will print perfectly on a A4 sheet, directly out of juicy-gcode, with no need to rescale
-* We have compiled the [svg2gcode](https://docs.rs/svg2gcode/latest/svg2gcode/) crate to webassembly. See Mozilla's guidelines to [compile rust to webassembly](https://developer.mozilla.org/en-US/docs/WebAssembly/Rust_to_wasm). 
-* The results are in [```https://github.com/bbaudry/swart-studio/blob/main/penplotting/web_svg2gcode_bg.wasm```](web_svg2gcode_bg.wasm) and [```web_svg2gcode.js```](https://github.com/bbaudry/swart-studio/blob/main/penplotting/web_svg2gcode.js) files
-* In the html page, feed the svg generated by p5 into the svg2gcode in wasm. We have a first integration in [plottable001.html](https://github.com/bbaudry/swart-studio/blob/main/penplotting/plottable001.html) 
+* SVG to gcode, option #1
+  * use [juicy-gcode](https://github.com/domoszlai/juicy-gcode)
+  * ```juicy-gcode -f ../penplotting/flavor.txt ../penplotting/testplotsize.svg > testplotsize.gcode```
+  * our uunatek pen plotter plots with a resolution of 96 dpi, so: 
+    * a canvas of ```h = 1122; w = 793``` will print perfectly on a A4 sheet, directly out of juicy-gcode, with no need to rescale
+    * a canvas of ```h = 1587; w = 1122```  will print perfectly on a A3 sheet, directly out of juicy-gcode, with no need to rescale
+* SVG to gcode, option # 2
+  * use [svg2gcode](https://docs.rs/svg2gcode/latest/svg2gcode/)
+  * We have compiled the [svg2gcode](https://docs.rs/svg2gcode/latest/svg2gcode/) crate to webassembly. See Mozilla's guidelines to [compile rust to webassembly](https://developer.mozilla.org/en-US/docs/WebAssembly/Rust_to_wasm). 
+  * The results are in [```https://github.com/bbaudry/swart-studio/blob/main/penplotting/web_svg2gcode_bg.wasm```](web_svg2gcode_bg.wasm) and [```web_svg2gcode.js```](https://github.com/bbaudry/swart-studio/blob/main/penplotting/web_svg2gcode.js) files
+  * In the html page, feed the svg generated by p5 into the svg2gcode in wasm. We have a first integration in [plottable001.html](https://github.com/bbaudry/swart-studio/blob/main/penplotting/plottable001.html) 
 
 
 ### Fonts and letters