build out p5 adapter
This commit is contained in:
Scott Richmond
parent
af125ffbbb
commit
d8f152998e
179
build/ludus.mjs
179
build/ludus.mjs
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@ -6,25 +6,22 @@ let result = null
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export function run (source) {
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const output = mod.ludus(source).value
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// console.log(output)
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result = JSON.parse(output)
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return result
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}
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export function stdout () {
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if (!result) return ""
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return result.io.console.data
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}
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export function turtle_commands () {
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if (!result) return []
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return result.io.turtle.data
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}
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export function p5_calls () {
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return p5_call_list
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}
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export function svg () {
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// TODO
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}
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const turtle_init = {
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@ -55,13 +52,14 @@ const colors = {
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aqua: [0, 255, 25, 255],
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}
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let turtle_states = [turtle_init]
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let background_color = "black"
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function last_state () {
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return turtle_states[turtle_states.length - 1]
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function resolve_color (color) {
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if (typeof color === 'string') return colors[color]
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if (typeof color === 'number') return [color, color, color, 255]
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if (Array.isArray(color)) return color
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}
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let background_color = "black"
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function add (v1, v2) {
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const [x1, y1] = v1
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const [x2, y2] = v2
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@ -76,83 +74,84 @@ function mult (vector, scalar) {
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function unit_of (heading) {
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const turns = -heading + 0.25
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const radians = turn_to_rad(turns)
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[Math.cos (radians), Math.sin(radians)]
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return [Math.cos(radians), Math.sin(radians)]
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}
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function command_to_state (previous, command) {
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const verb = command[0]
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function command_to_state (prev_state, curr_command) {
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const verb = curr_command[0]
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switch (verb) {
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case "goto": {
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const [_, x, y] = command
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return {...previous, position: [x, y]}
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const [_, x, y] = curr_command
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return {...prev_state, position: [x, y]}
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}
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case "home": {
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return {...previous, position: [0, 0], heading: 0}
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return {...prev_state, position: [0, 0], heading: 0}
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}
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case "right": {
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const [_, angle] = command
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const {heading} = previous
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return {...previous, heading: heading + angle}
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const [_, angle] = curr_command
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const {heading} = prev_state
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return {...prev_state, heading: heading + angle}
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}
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case "left": {
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const [_, angle] = command
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const {heading} = previous
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return {...previous, heading: heading - angle}
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const [_, angle] = curr_command
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const {heading} = prev_state
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return {...prev_state, heading: heading - angle}
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}
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case "forward": {
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const [_, steps] = command
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const {heading, position} = previous
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const [_, steps] = curr_command
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const {heading, position} = prev_state
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const unit = unit_of(heading)
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const move = mult(unit, steps)
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return {...previous, position: add(position, move)}
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return {...prev_state, position: add(position, move)}
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}
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case "back": {
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const [_, steps] = command
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const {heading, position} = previous
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const [_, steps] = curr_command
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const {heading, position} = prev_state
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const unit = unit_of(heading)
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const move = mult(unit, -steps)
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return {...previous, position: add(position, move)}
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return {...prev_state, position: add(position, move)}
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}
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case "penup": {
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return {...previous, pendown: false}
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return {...prev_state, pendown: false}
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}
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case "pendown": {
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return {...previous, pendown: true}
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return {...prev_state, pendown: true}
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}
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case "pendwith": {
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const [_, width] = command
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return {...previous, penwidth: width}
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const [_, width] = curr_command
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return {...prev_state, penwidth: width}
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}
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case "pencolor": {
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if (command.length = 2) {
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const [_, color] = command
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return {...previous, pencolor: color}
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console.log(curr_command)
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if (curr_command.length = 2) {
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const [_, color] = curr_command
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return {...prev_state, pencolor: color}
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} else {
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const [_, r, g, b, a] = command
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return {...previous, pencolor: [r, g, b, a]}
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const [_, r, g, b, a] = curr_command
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return {...prev_state, pencolor: [r, g, b, a]}
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}
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}
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case "setheading": {
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const [_, heading] = command
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return {...previous, heading: heading}
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const [_, heading] = curr_command
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return {...prev_state, heading: heading}
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}
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case "loadstate": {
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const [_, x, y, heading, visible, pendown, penwidth] = command
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const [_, x, y, heading, visible, pendown, penwidth] = curr_command
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// there are 7 fixed-arity arguments
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// color will either be the last one or four
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let pencolor = command.slice(7)
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let pencolor = curr_command.slice(7)
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// if there's one, it's a string, unpack it
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if (pencolor.length = 1) pencolor = pencolor[0]
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return {position: [x, y], heading, visible, pendown, penwidth, pencolor}
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}
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case "show": {
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return {...position, visible: true}
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return {...prev_state, visible: true}
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}
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case "hide": {
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return {...position, visible: false}
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return {...prev_state, visible: false}
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}
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case "background": {
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let color = command.slice(1)
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let color = curr_command.slice(1)
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if (color.lengh = 1) color = color[0]
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background_color = color
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return
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@ -166,8 +165,26 @@ function are_eq (v1, v2) {
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return (x1 === x2) && (y1 === y2)
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}
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function state_to_call (prev, curr) {
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function states_to_call (prev, curr) {
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const calls = []
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// whose state should we use?
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// pen states will only differ on more than one property
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// if we use `loadstate`
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// my sense is `prev`, but that may change
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if (prev.pendown && !are_eq(prev.position, curr.position)) {
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calls.push(["line", prev.position[0], prev.position[1], curr.position[0], curr.position[1]])
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}
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if (curr.pencolor !== prev.pencolor) {
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if (Array.isArray(curr.pencolor)) {
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calls.push(["stroke", ...curr.pencolor])
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} else {
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calls.push(["stroke", curr.pencolor])
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}
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}
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if (curr.penwidth !== prev.penwidth) {
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calls.push(["strokeWeight", curr.penwidth])
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}
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return calls
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}
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const turtle_radius = 20
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@ -176,47 +193,65 @@ const turtle_angle = 0.385
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const turtle_color = [255, 255, 255, 150]
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let p5_call_list = []
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function add_p5_call (call) {
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p5_call_list.push(call)
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}
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const p5_call_root = [
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["background", ...resolve_color(background_color)],
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["stroke", ...resolve_color(turtle_init.pencolor)]
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]
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function rotate (vector, heading) {
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const radians = turn_to_rad(heading)
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const [x, y] = vector
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return [
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(x * cos (radians)) - (y * sin (radians)),
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(x * sin (radians)) + (y * cos (radians))
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(x * Math.cos (radians)) - (y * Math.sin (radians)),
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(x * Math.sin (radians)) + (y * Math.cos (radians))
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]
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}
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function turn_to_rad (heading) {
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heading * 2 * Math.PI
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return heading * 2 * Math.PI
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}
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function render_turtle () {
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const state = last_state ()
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function render_turtle (state, calls) {
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if (!state.visible) return
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calls.push(["push"])
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const [r, g, b, a] = turtle_color
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add_call("fill", r, g, b, a)
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const {heading, pencolor: [pen_r, pen_g, pen_b, pen_a], position: [x, y], pendown} = state
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calls.push(["fill", r, g, b, a])
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const {heading, pencolor, position: [x, y], pendown} = state
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const origin = [0, turtle_radius]
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const [x1, y1] = origin
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const [x2, y2] = rotate(origin, turtle_angle)
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const [x3, y3] = rotate(origin, -turtle_angle)
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add_p5_call(["push"])
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add_p5_call(["translate", x, y])
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add_p5_call(["rotate", turn_to_rad(heading)])
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add_p5_call(["noStroke"])
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add_p5_call(["beginShape"])
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add_p5_call(["vertex", x1, y1])
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add_p5_call(["vertex", x2, y2])
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add_p5_call(["vertex", x3, y3])
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add_p5_call(["endShape"])
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add_p5_call(["stroke", pen_r, pen_g, pen_b, pen_a])
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if (pendown) add_p5_call(["line", 0, 0, x1, y1])
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add_p5_call(["pop"])
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calls.push(["translate", x, y])
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calls.push(["rotate", turn_to_rad(heading)])
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calls.push(["noStroke"])
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calls.push(["beginShape"])
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calls.push(["vertex", x1, y1])
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calls.push(["vertex", x2, y2])
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calls.push(["vertex", x3, y3])
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calls.push(["endShape"])
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calls.push(["stroke", ...resolve_color(pencolor)])
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if (pendown) calls.push(["line", 0, 0, x1, y1])
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calls.push(["pop"])
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return calls
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}
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export function p5_calls (commands) {
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const states = [turtle_init]
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commands.reduce((prev_state, command) => {
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const new_state = command_to_state(prev_state, command)
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states.push(new_state)
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return new_state
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}, turtle_init)
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const p5_calls = [...p5_call_root]
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for (let i = 1; i < states.length; ++i) {
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const prev = states[i - 1]
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const curr = states[i]
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const calls = states_to_call(prev, curr)
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for (const call of calls) {
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p5_calls.push(call)
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}
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}
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p5_calls[0] = ["background", ...resolve_color(background_color)]
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render_turtle(states[states.length - 1], p5_calls)
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return p5_calls
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}
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