A simple board function and node set for Node-RED
RTK Board node gets command list as a String or an Array of String.
A semicolon ; is a separator of commands.
A space character is a separator of arguments.
A starting dollar character $ means a variable in argument list.
A starting dollar character and bracket $()means a operational expression in argument list. You can refer the variables with $. name space in this operational expression.
A percent character % following the number means relative location against the campus size.
An under bar character _ means the same as before command in argument list. The processing unit remember each argument value into the variable (for example, you can refer the last x location in the variable _x), and this character shows the same value of it.
Start with '#' shows a comment and/or label (label is not implimented yet). Start with '##' shows a comment, and also shows this text into brwser's console.
| Command | Arguments | Description |
|---|---|---|
| init | - | Reset internal values |
| cls | color | Set line/fill color |
| c color |
color | Set color |
| cRand colorRand |
- | Set color randomly |
| w width |
width | Set line width |
| g go goTo |
x, y | Move pen (absolute location) |
| gRand goRand goToRand |
x, y | Move pen (absolute location) randomly |
| m move moveTo |
x, y | Move pen (relative location) |
| sr rect strokeRect |
x, y, w, h, color, width | Draw a rectangle |
| fr fillRect |
x, y, w, h, color, width | Draw a filled rectangle |
| cr clearRect |
x, y, w, h | Clear a rectangle area |
| font tf textFont |
text_font | Set text font (e.g. 30px serif) |
| t text ft fillText |
text | Draw filled text |
| st strokeText |
text | Draw text curb |
| i img image |
src, x, y | Draw an image from URL |
| iTo imgTo imageTo |
src, x, y, w, h | Draw an image from URL with scaling |
| wait | - | wait async commands (e.g. image) |
| Command | Arguments | Description |
|---|---|---|
| bp beginPath |
- | Start a drawing path |
| cp closePath |
- | End a drawing path |
| lc lineCap |
line_cap | Shape used to draw the end points of lines (butt, round or square) |
| l line lineTo |
x, y | Path of line |
| arc | r, x, y, sa (start angle), ea (end angle), color, width | Path of arc |
| el ellipse |
w, h, x, y, sa, ea, ra (rotation angle), color, width | Path of ellipse |
| f fill |
color | End a drawing path with stroking |
| s stroke |
color | End a drawing path with filling |
| Command | Arguments | Description |
|---|---|---|
| let | variable, value | Assign a value to a variable |
| add | variable, value | Add a value to a variable |
| sub | variable, value | Sub a value from a variable |
| rand | variable, rand_bound | Assign a random value to a variable |
| Command | Arguments | Description |
|---|---|---|
| skip | step_delta | Change step with step_delta |
| if | condition_variable, step_delta | If condition is not 0, change step with step_delta |
| loop | name_of_counter_variable, step_delta | Sub 1 from counter; If counter is not 0, change step with step_delta |
| nop | - | Do nothing |
| Command | Arguments | Description |
|---|---|---|
| face | face_mode, face_type, w, h, x, y, width, color | Draw a face |