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abstract class PetriNode{
}
class Place extends PetriNode{
name: string;
static deserialize(json: PlaceInterface): Place{
return Object.assign(new Place(), json);
}
draw(context: CanvasRenderingContext2D, palette: ColorPalette, viewWindow: ViewWindow, position: Point, radius: number){
const drawer = new Drawer(context);
const positionVW = viewWindow.canvasPoint(position);
const radius2 = viewWindow.size(radius);
drawer.drawCircle(positionVW.x, positionVW.y, radius2, new SurfaceStyle(palette.foreground, 1, palette.border));
drawer.drawText(this.name, positionVW.x, positionVW.y, new TextStyle(palette.border));
}
}
class Transition extends PetriNode{
condition: string;
static deserialize(json: TransitionInterface): Transition{
return Object.assign(new Transition(), json);
}
draw(context: CanvasRenderingContext2D, palette: ColorPalette, viewWindow: ViewWindow, position: Point, width: number, height: number){
const drawer = new Drawer(context);
const positionVW = viewWindow.canvasPoint(position);
const width2 = viewWindow.size(width);
const height2 = viewWindow.size(height);
drawer.drawRectangle(positionVW.x-0.5*width2, positionVW.y-0.5*height2, width2, height2, new SurfaceStyle(palette.foreground, 1, palette.border));
drawer.drawText(this.condition, positionVW.x, positionVW.y, new TextStyle(palette.border));
}
}
abstract class Arc{
draw(context: CanvasRenderingContext2D, palette: ColorPalette, viewWindow: ViewWindow, sourcePosition: Point, destinationPosition: Point,
placeRadius: number, transitionHeight: number){
const drawer = new Drawer(context);
const sourcePositionVW = viewWindow.canvasPoint(sourcePosition);
const destinationPositionVW = viewWindow.canvasPoint(destinationPosition);
const radius = viewWindow.size(placeRadius);
const height = viewWindow.size(transitionHeight);
const edgeStyle = new EdgeStyle(1, palette.border);
const surfaceStyle = new SurfaceStyle(null , 1, palette.border);
if (sourcePositionVW.y < destinationPositionVW.y){
// Downstream
if (this instanceof InputArc){
sourcePositionVW.y += radius;
destinationPositionVW.y -= 0.5*height;
}
else{
sourcePositionVW.y += 0.5*height;
destinationPositionVW.y -= radius;
}
drawer.drawArrow(sourcePositionVW, destinationPositionVW, edgeStyle);
}
else{
// Upstream
const dX = sourcePositionVW.x - destinationPositionVW.x;
const dY = sourcePositionVW.y - destinationPositionVW.y;
const absDxUp = Math.max(1.5*dX, 0.1*dY, 3*height);
const yMargin = Math.max(0.05*Math.abs(dY), 1.1*height);
const p2 = sourcePositionVW.add(new Point(0, yMargin));
const p5 = destinationPositionVW.add(new Point(0, -yMargin));
const dxUp = dX != 0 ? Math.sign(dX)*absDxUp : absDxUp;
const xUp = sourcePositionVW.x + dxUp;
const p3 = new Point(xUp, p2.y);
const p4 = new Point(xUp, p5.y);
const points = [sourcePositionVW, p2, p3, p4, p5];
drawer.drawPolygon(points, surfaceStyle);
drawer.drawArrow(p5, destinationPositionVW ,edgeStyle);
}
}
}
class InputArc extends Arc{
source: Place;
destination: Transition;
constructor(source: Place, destination: Transition){
super();
this.source = source;
this.destination = destination;
}
}
class OutputArc extends Arc{
source: Transition;
destination: Place;
constructor(source: Transition, destination: Place){
super();
this.source = source;
this.destination = destination;
}
}
interface PlaceInterface{
name: string;
}
interface TransitionInterface{
condition: string;
}
interface ArcInterface{
source: string;
destination: string;
weight: number;
}
export interface PetriNetworkInterface{
places: PlaceInterface[]
transitions: TransitionInterface[]
input_arcs: ArcInterface[];
output_arcs: ArcInterface[];
}
function jsonPointerToIndex(jsonPointer: string){
return Number(jsonPointer.split('/').at(-1));
}
class PetriLayout extends Map<PetriNode, Point>{
}
export class PetriNetwork extends DrawObject{
places: Place[];
transitions: Transition[];
inputArcs: InputArc[];
outputArcs: OutputArc[];
layout: PetriLayout;
constructor(places: Place[], transitions: Transition[], inputArcs: InputArc[], outputArcs: OutputArc[]){
super();
this.places = places;
this.transitions = transitions;
this.inputArcs = inputArcs;
this.outputArcs = outputArcs;
this.layout = this.computeLayout();
window.addEventListener('keydown', (event) => {
if (event.key == 'r'){
this.layout = this.relaxLayout(this.layout, 1, 1);
}
if (event.key == 't'){
this.layout = this.computeLayout();
}
});
}
static deserialize(jsonPetri: PetriNetworkInterface): PetriNetwork{
const places: Place[] = [];
for (const placeJson of jsonPetri['places']){
places.push(Place.deserialize(placeJson));
}
const transitions: Transition[] = [];
for (const json of jsonPetri['transitions']){
transitions.push(Transition.deserialize(json));
}
const inputArcs: InputArc[] = [];
for (const json of jsonPetri['input_arcs']){
const sourceIndex = jsonPointerToIndex(json["source"]);
const destinationIndex = jsonPointerToIndex(json["destination"]);
inputArcs.push(new InputArc(places[sourceIndex], transitions[destinationIndex]));
}
const outputArcs: OutputArc[] = [];
for (const json of jsonPetri['output_arcs']){
const sourceIndex = jsonPointerToIndex(json["source"]);
const destinationIndex = jsonPointerToIndex(json["destination"]);
outputArcs.push(new OutputArc(transitions[sourceIndex], places[destinationIndex]));
}
return new PetriNetwork(places, transitions, inputArcs, outputArcs);
}
// eslint-disable-next-line
override mouseDownCallback(clickPoint: Point, viewWindow: ViewWindow){
return true;
}
successors(node: PetriNode): PetriNode[]{
let arcs;
if (node instanceof Transition){
arcs = this.outputArcs;
}
else{
arcs = this.inputArcs;
}
const successors: (Place | Transition)[] = [];
for (const arc of arcs){
if (arc.source == node){
successors.push(arc.destination);
}
}
return successors;
}
predecessors(node: PetriNode): PetriNode[]{
let arcs;
if (node instanceof Transition){
arcs = this.inputArcs;
}
else{
arcs = this.outputArcs;
}
const predecessors: (Place | Transition)[] = [];
for (const arc of arcs){
if (arc.destination == node){
predecessors.push(arc.source);
}
}
return predecessors;
}
neighbors(node: PetriNode): PetriNode[]{
return this.successors(node).concat(this.predecessors(node));
}
private assignLayers(): Map<PetriNode, number> {
const layers: Map<PetriNode, number> = new Map();
layers.set(this.places[0], 0);
let layerNumber = 1;
const nNodes = this.places.length + this.transitions.length;
let currentNodes: PetriNode[] = [this.places[0]];
let nIter = 0;
const nIterMax = 5*nNodes;
while (layers.size < nNodes && nIter < nIterMax){
const visitedNodes: PetriNode[] = [];
for (const node1 of currentNodes){
for (const node2 of this.successors(node1)){
if (!layers.has(node2)){
layers.set(node2, layerNumber);
visitedNodes.push(node2);
}
}
}
currentNodes = visitedNodes;
layerNumber += 1;
nIter += 1;
}
return layers;
}
computeLayout(): PetriLayout {
const layers = this.assignLayers(); // Step 2: Assign layers
const layerHeight = -1; // Vertical distance between layers
const nodeSpacing = 1; // Horizontal distance between nodes in a layer
// Create coordinates for each node
const layout = new PetriLayout();
const layersGrouped = new Map<number, PetriNode[]>();
// Group nodes by their layers
layers.forEach((layer, node) => {
if (!layersGrouped.has(layer)) {
layersGrouped.set(layer, []);
}
layersGrouped.get(layer)!.push(node);
});
// Assign coordinates
layersGrouped.forEach((nodes, layer) => {
nodes.forEach((node, index) => {
layout.set(node, new Point(index * nodeSpacing, layer * layerHeight));
});
});
return layout;
}
relaxLayout(layout: PetriLayout, nodeSpacing:number, iterations: number=1): Map<PetriNode, Point> {
// Finding the most relaxable node
for (let iter=0;iter < iterations;iter++){
let bestMark = 0;
let bestNode: PetriNode | null = null;
let bestNodeNewX: number = 0;
let bestNodeY: number = 0;
for (const [node, nodePosition] of layout){
const neighborX: number[] = [];
for (const neighbor of this.neighbors(node)){
const position = layout.get(neighbor);
if (position !== undefined){
neighborX.push(position.x);
}
}
let sum = 0.;
neighborX.forEach((el) => sum += el);
let idealX = sum / (neighborX.length);
if (idealX != nodePosition.x){
// Find Layer neighbor
let nearestLayerNeighbor: PetriNode | null = null;
let layerNeighborDistance = 10000;
const pointDistance = nodePosition.x - idealX;
for (const [node2, node2Position] of layout){
if (node2Position.y == nodePosition.y){
const point2Distance = node2Position.x - idealX;
if (point2Distance / pointDistance > 0){
if (Math.abs(point2Distance) < layerNeighborDistance){
nearestLayerNeighbor = node2;
layerNeighborDistance = Math.abs(point2Distance);
}
}
}
}
// restrict ideal X with spacing constraints
if (nearestLayerNeighbor !== null){
const neighborPosition = layout.get(nearestLayerNeighbor);
if (neighborPosition !== undefined){
const neighborDistance = Math.abs(neighborPosition.x - nodePosition.x);
const margin = neighborDistance - nodeSpacing - pointDistance;
if (margin < 0){
if (nodePosition.x - idealX < 0){
idealX -= margin;
}
else{
idealX += margin;
}
}
}
}
const mark = Math.abs(nodePosition.x - idealX);
if (mark > bestMark){
bestNode = node;
bestMark = mark;
bestNodeNewX = idealX;
bestNodeY = nodePosition.y;
}
}
}
if (bestNode !== null){
layout.set(bestNode, new Point(bestNodeNewX, bestNodeY));
}
}
return layout;
}
override get zone(): Zone{
const points: Point[] = [];
for (const point of this.layout.values()) {
points.push(point);
}
return Zone.fromPoints(points);
}
override draw(context: CanvasRenderingContext2D, viewWindow: ViewWindow){
const isDarkMode = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches;
let palette = lightPalette;
Iif (isDarkMode){
palette = darkPalette;
}
// Drawing background
context.rect(0, 0, context.canvas.width, context.canvas.height);
context.fillStyle = palette.background;
context.fill();
const size = 0.2;
const radius = 0.5*size;
const transitionHeight = size;
const transitionWidth = 3*transitionHeight;
for (const arc of this.inputArcs){
const sourcePosition = this.layout.get(arc.source);
const destinationPosition = this.layout.get(arc.destination);
Eif (sourcePosition instanceof Point && destinationPosition instanceof Point){
arc.draw(context, palette, viewWindow, sourcePosition, destinationPosition, radius, transitionHeight);
}
}
for (const arc of this.outputArcs){
const sourcePosition = this.layout.get(arc.source);
const destinationPosition = this.layout.get(arc.destination);
Eif (sourcePosition instanceof Point && destinationPosition instanceof Point){
arc.draw(context, palette, viewWindow, sourcePosition, destinationPosition, radius, transitionHeight);
}
}
for (const place of this.places){
const position = this.layout.get(place);
if (position instanceof Point){
place.draw(context, palette, viewWindow, position, radius);
}
}
for (const transition of this.transitions){
const position = this.layout.get(transition);
if (position instanceof Point){
transition.draw(context, palette, viewWindow, position, transitionWidth, transitionHeight);
}
}
}
}
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