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ARTIFACT_LABEL_MARGIN,
BOUNDARY_EVENT_LABEL_MARGIN,
EVENT_LABEL_MARGIN,
FLOW_LABEL_MARGIN,
GATEWAY_LABEL_MARGIN,
LABEL_LINE_HEIGHT,
} from '../di-constants';
import type { Bounds, Point, ElementDimension } from '../types';
export interface PlacedShape {
element: any;
bounds: Bounds;
isExpanded?: boolean;
labelBounds?: Bounds;
}
export interface PlacedEdge {
element: any;
waypoints: Point[];
labelBounds?: Bounds;
}
export interface LabelLayoutContext {
shapes: PlacedShape[];
edges: PlacedEdge[];
lanes?: Array<{ element: any; bounds: Bounds }>;
}
export interface CollisionContext {
shapes: PlacedShape[];
edges: PlacedEdge[];
placedLabels: Bounds[];
ignoreElementId?: string;
}
export function isEvent(element: any): boolean {
const t = element?.$type || '';
return (
t === 'bpmn:StartEvent' ||
t === 'bpmn:EndEvent' ||
t === 'bpmn:IntermediateCatchEvent' ||
t === 'bpmn:IntermediateThrowEvent' ||
t === 'bpmn:BoundaryEvent'
);
}
export function isBoundaryEvent(element: any): boolean {
return (element?.$type || '') === 'bpmn:BoundaryEvent';
}
export function isGateway(element: any): boolean {
const t = element?.$type || '';
return (
t === 'bpmn:ExclusiveGateway' ||
t === 'bpmn:ParallelGateway' ||
t === 'bpmn:InclusiveGateway' ||
t === 'bpmn:EventBasedGateway' ||
t === 'bpmn:ComplexGateway'
);
}
export function isArtifact(element: any): boolean {
const t = element?.$type || '';
return t === 'bpmn:DataObjectReference' || t === 'bpmn:DataStoreReference';
}
export function isFlow(element: any): boolean {
const t = element?.$type || '';
return t === 'bpmn:SequenceFlow' || t === 'bpmn:MessageFlow';
}
export function estimateWordWidth(word: string): number {
let width = 0;
for (const char of word) {
if (char === ' ') {
width += 3.5;
} else if (/[mwMW]/.test(char)) {
width += 9.5;
} else if (/[ijlrtfI1]/.test(char)) {
width += 3.5;
} else if (/[A-Z]/.test(char)) {
width += 7.5;
} else {
width += 6.0;
}
}
return width;
}
export function computeLabelVisualShift(text?: string): number {
if (!text || text.trim() === '') {
return 0;
}
const words = text.split(/\s+/);
let maxWordW = 0;
for (const w of words) {
if (!w) {
continue;
}
const wLen = estimateWordWidth(w);
if (wLen > maxWordW) {
maxWordW = wLen;
}
}
const lines = text.split('\n');
let maxLineW = 0;
for (const line of lines) {
const trimmedLine = line.trim();
if (!trimmedLine) {
continue;
}
const lLen = estimateWordWidth(trimmedLine);
if (lLen > maxLineW) {
maxLineW = lLen;
}
}
const neededW = Math.ceil(maxWordW) + 4;
const boxW = Math.ceil(maxLineW);
if (boxW < neededW) {
return 2;
}
return 0;
}
export function estimateLabelDimensions(text: string): { width: number; height: number } {
const lines = text.split('\n');
let maxLineWidth = 0;
for (const line of lines) {
const lineWidth = estimateWordWidth(line);
maxLineWidth = Math.max(maxLineWidth, Math.ceil(lineWidth) + 4);
}
let width = Math.max(20, maxLineWidth);
if (width % 2 !== 0) {
width += 1;
}
let height = lines.length === 1 ? LABEL_LINE_HEIGHT : lines.length * (LABEL_LINE_HEIGHT - 1) + 1;
if (height % 2 !== 0) {
height += 1;
}
return { width, height };
}
export function estimateTextAnnotationDimensions(text?: string, width = 100): ElementDimension {
if (!text || text.trim() === '') {
return { width, height: 30 };
}
const maxLineW = width - 14;
const rawLines = text.split('\n');
let totalLines = 0;
for (const rawLine of rawLines) {
const trimmed = rawLine.trim();
if (!trimmed) {
totalLines++;
continue;
}
const words = trimmed.split(/\s+/);
let curLineW = 0;
let lineWords = 0;
for (const w of words) {
const wLen = estimateWordWidth(w);
const space = lineWords > 0 ? 4 : 0;
if (lineWords > 0 && curLineW + space + wLen > maxLineW) {
totalLines++;
curLineW = wLen;
lineWords = 1;
} else {
curLineW += space + wLen;
lineWords++;
}
}
totalLines++;
}
let height = Math.max(30, Math.round(totalLines * 14.4 + 14));
if (height % 2 !== 0) {
height += 1;
}
return { width, height };
}
export function generateTextWrapCandidates(text: string): string[] {
const trimmed = text.trim();
const words = trimmed.split(/\s+/);
if (words.length <= 1) {
return [trimmed];
}
const candidates: string[] = [trimmed];
let bestMidSplit = '';
let minDiff = Number.POSITIVE_INFINITY;
for (let i = 1; i < words.length; i++) {
const line1 = words.slice(0, i).join(' ');
const line2 = words.slice(i).join(' ');
const diff = Math.abs(line1.length - line2.length);
if (diff < minDiff) {
minDiff = diff;
bestMidSplit = `${line1}\n${line2}`;
}
}
candidates.push(bestMidSplit);
if (words.length >= 3) {
appendThreeLineWrapCandidates(words, candidates);
}
return candidates;
}
function appendThreeLineWrapCandidates(words: string[], candidates: string[]): void {
let best3Split = '';
let min3Diff = Number.POSITIVE_INFINITY;
for (let i = 1; i < words.length - 1; i++) {
for (let j = i + 1; j < words.length; j++) {
const l1 = words.slice(0, i).join(' ');
const l2 = words.slice(i, j).join(' ');
const l3 = words.slice(j).join(' ');
const maxLen = Math.max(l1.length, l2.length, l3.length);
const minLen = Math.min(l1.length, l2.length, l3.length);
const diff = maxLen - minLen;
if (diff < min3Diff) {
min3Diff = diff;
best3Split = `${l1}\n${l2}\n${l3}`;
}
}
}
candidates.push(best3Split);
}
export function boxesOverlap(a: Bounds, b: Bounds): boolean {
return a.x < b.x + b.width && a.x + a.width > b.x && a.y < b.y + b.height && a.y + a.height > b.y;
}
export function doesSegmentCollideWithBox(p1: Point, p2: Point, box: Bounds): boolean {
const minX = Math.min(p1.x, p2.x);
const maxX = Math.max(p1.x, p2.x);
const minY = Math.min(p1.y, p2.y);
const maxY = Math.max(p1.y, p2.y);
if (
maxX <= box.x + 1 ||
minX >= box.x + box.width - 1 ||
maxY <= box.y + 1 ||
minY >= box.y + box.height - 1
) {
return false;
}
if (p1.y === p2.y) {
return p1.y >= box.y - 1 && p1.y <= box.y + box.height + 1;
}
if (p1.x === p2.x) {
return p1.x >= box.x - 1 && p1.x <= box.x + box.width + 1;
}
return true;
}
export function doesBoxCollide(box: Bounds, cctx: CollisionContext): boolean {
for (const s of cctx.shapes) {
if (s.element.id === cctx.ignoreElementId) {
continue;
}
const t = s.element?.$type;
if (t === 'bpmn:Participant' || t === 'bpmn:Lane') {
continue;
}
if (boxesOverlap(box, s.bounds)) {
return true;
}
}
for (const edge of cctx.edges) {
if (edge.element.id === cctx.ignoreElementId) {
continue;
}
const wps = edge.waypoints;
for (let i = 0; i < wps.length - 1; i++) {
if (doesSegmentCollideWithBox(wps[i], wps[i + 1], box)) {
return true;
}
}
}
return cctx.placedLabels.some((lbl) => boxesOverlap(box, lbl));
}
export interface ElementLabelGeom {
elementBounds: Bounds;
dim: { width: number; height: number };
margin: number;
element?: any;
text?: string;
}
function computeOrthogonalElementBounds(
geom: ElementLabelGeom,
side: 'bottom' | 'top' | 'right' | 'left'
): Bounds {
const { elementBounds, dim, margin, element, text } = geom;
const shift = computeLabelVisualShift(text);
const cx = Math.round(elementBounds.x + elementBounds.width / 2) - shift;
const cy = Math.round(elementBounds.y + elementBounds.height / 2);
const isBoundary = isBoundaryEvent(element);
if (side === 'bottom') {
return {
x: cx - dim.width / 2,
y: elementBounds.y + elementBounds.height + margin,
width: dim.width,
height: dim.height,
};
}
if (side === 'top') {
return {
x: cx - dim.width / 2,
y: elementBounds.y - margin - dim.height,
width: dim.width,
height: dim.height,
};
}
if (side === 'right') {
return {
x: elementBounds.x + elementBounds.width + margin,
y: isBoundary ? elementBounds.y + elementBounds.height + margin : cy - dim.height / 2,
width: dim.width,
height: dim.height,
};
}
return {
x: elementBounds.x - margin - dim.width,
y: isBoundary ? elementBounds.y + elementBounds.height + margin : cy - dim.height / 2,
width: dim.width,
height: dim.height,
};
}
function computeGatewayDiagonalBounds(
geom: ElementLabelGeom,
corner: 'top-right' | 'bottom-right' | 'top-left' | 'bottom-left'
): Bounds {
const { elementBounds, dim } = geom;
const cx = Math.round(elementBounds.x + elementBounds.width / 2);
const cy = Math.round(elementBounds.y + elementBounds.height / 2);
if (corner === 'top-right') {
return { x: cx + 14, y: cy - 14 - dim.height, width: dim.width, height: dim.height };
}
if (corner === 'bottom-right') {
return { x: cx + 14, y: cy + 14, width: dim.width, height: dim.height };
}
if (corner === 'top-left') {
return {
x: cx - 14 - dim.width,
y: cy - 14 - dim.height,
width: dim.width,
height: dim.height,
};
}
return { x: cx - 14 - dim.width, y: cy + 14, width: dim.width, height: dim.height };
}
function computeDiagonalElementBounds(
geom: ElementLabelGeom,
corner: 'top-right' | 'bottom-right' | 'top-left' | 'bottom-left'
): Bounds {
if (isGateway(geom.element)) {
return computeGatewayDiagonalBounds(geom, corner);
}
const { elementBounds, dim, margin } = geom;
if (corner === 'top-right') {
return {
x: elementBounds.x + elementBounds.width + margin,
y: elementBounds.y - margin - dim.height,
width: dim.width,
height: dim.height,
};
}
if (corner === 'bottom-right') {
return {
x: elementBounds.x + elementBounds.width + margin,
y: elementBounds.y + elementBounds.height + margin,
width: dim.width,
height: dim.height,
};
}
if (corner === 'top-left') {
return {
x: elementBounds.x - margin - dim.width,
y: elementBounds.y - margin - dim.height,
width: dim.width,
height: dim.height,
};
}
return {
x: elementBounds.x - margin - dim.width,
y: elementBounds.y + elementBounds.height + margin,
width: dim.width,
height: dim.height,
};
}
interface PlacementAttempt {
labelBounds: Bounds;
text: string;
}
export interface PlacementContext {
shape: PlacedShape;
margin: number;
cctx: CollisionContext;
}
function findBestOrthogonalPlacement(pctx: PlacementContext): PlacementAttempt | undefined {
const wrapCandidates = generateTextWrapCandidates(pctx.shape.element.name);
const sides: Array<'bottom' | 'top' | 'right' | 'left'> = ['bottom', 'top', 'right', 'left'];
for (const text of wrapCandidates) {
const dim = estimateLabelDimensions(text);
const geom: ElementLabelGeom = {
elementBounds: pctx.shape.bounds,
dim,
margin: pctx.margin,
element: pctx.shape.element,
text,
};
for (const side of sides) {
const candidate = computeOrthogonalElementBounds(geom, side);
if (!doesBoxCollide(candidate, pctx.cctx)) {
return { labelBounds: candidate, text };
}
}
}
return undefined;
}
function findBestDiagonalPlacement(pctx: PlacementContext): PlacementAttempt {
const wrapCandidates = generateTextWrapCandidates(pctx.shape.element.name);
const corners: Array<'top-right' | 'bottom-right' | 'top-left' | 'bottom-left'> = [
'top-right',
'bottom-right',
'top-left',
'bottom-left',
];
for (const text of wrapCandidates) {
const dim = estimateLabelDimensions(text);
const geom: ElementLabelGeom = {
elementBounds: pctx.shape.bounds,
dim,
margin: pctx.margin,
element: pctx.shape.element,
text,
};
for (const corner of corners) {
const candidate = computeDiagonalElementBounds(geom, corner);
if (!doesBoxCollide(candidate, pctx.cctx)) {
return { labelBounds: candidate, text };
}
}
}
const fallbackText = wrapCandidates[wrapCandidates.length - 1];
const dim = estimateLabelDimensions(fallbackText);
const geom: ElementLabelGeom = {
elementBounds: pctx.shape.bounds,
dim,
margin: pctx.margin,
element: pctx.shape.element,
text: fallbackText,
};
return {
labelBounds: computeOrthogonalElementBounds(geom, 'bottom'),
text: fallbackText,
};
}
export function layoutElementLabel(
shape: PlacedShape,
placedLabels: Bounds[],
ctx: LabelLayoutContext
): void {
if (!shape.element?.name || shape.element.name.trim() === '') {
return;
}
let margin = EVENT_LABEL_MARGIN;
if (isGateway(shape.element)) {
margin = GATEWAY_LABEL_MARGIN;
} else if (isArtifact(shape.element)) {
margin = ARTIFACT_LABEL_MARGIN;
} else if (isBoundaryEvent(shape.element)) {
margin = BOUNDARY_EVENT_LABEL_MARGIN;
}
const cctx: CollisionContext = {
shapes: ctx.shapes,
edges: ctx.edges,
placedLabels,
ignoreElementId: shape.element.id,
};
const pctx: PlacementContext = { shape, margin, cctx };
const placement = findBestOrthogonalPlacement(pctx) || findBestDiagonalPlacement(pctx);
shape.labelBounds = placement.labelBounds;
shape.element.name = placement.text;
placedLabels.push(placement.labelBounds);
}
export interface PathLabelGeom {
p1: Point;
p2: Point;
dim: { width: number; height: number };
margin: number;
text?: string;
}
export function computePathSegmentLabel(
geom: PathLabelGeom,
side: 'top' | 'bottom' | 'right' | 'left'
): Bounds {
const { p1, p2, dim, margin, text } = geom;
const isHorizontal = p1.y === p2.y;
const shift = computeLabelVisualShift(text);
const mx = Math.round((p1.x + p2.x) / 2) - shift;
const my = Math.round((p1.y + p2.y) / 2);
if (isHorizontal) {
const y = side === 'top' ? p1.y - margin - dim.height : p1.y + margin;
return {
x: mx - dim.width / 2,
y,
width: dim.width,
height: dim.height,
};
}
const x = side === 'right' ? p1.x + margin : p1.x - margin - dim.width;
return {
x,
y: my - dim.height / 2,
width: dim.width,
height: dim.height,
};
}
export function layoutPathLabel(
edge: PlacedEdge,
placedLabels: Bounds[],
ctx: LabelLayoutContext
): void {
if (!edge.element?.name || edge.element.name.trim() === '' || edge.waypoints.length < 2) {
return;
}
const wrapCandidates = generateTextWrapCandidates(edge.element.name);
const wps = edge.waypoints;
const margin = FLOW_LABEL_MARGIN;
let bestSegIndex = 0;
let maxSegLen = 0;
for (let i = 0; i < wps.length - 1; i++) {
const len = Math.hypot(wps[i + 1].x - wps[i].x, wps[i + 1].y - wps[i].y);
if (len > maxSegLen) {
maxSegLen = len;
bestSegIndex = i;
}
}
const p1 = wps[bestSegIndex];
const p2 = wps[bestSegIndex + 1];
const isHorizontal = p1.y === p2.y;
const sides: Array<'top' | 'bottom' | 'right' | 'left'> = isHorizontal
? ['top', 'bottom']
: ['right', 'left'];
const cctx: CollisionContext = {
shapes: ctx.shapes,
edges: ctx.edges,
placedLabels,
ignoreElementId: edge.element.id,
};
for (const text of wrapCandidates) {
const dim = estimateLabelDimensions(text);
const geom: PathLabelGeom = { p1, p2, dim, margin, text };
for (const side of sides) {
const candidate = computePathSegmentLabel(geom, side);
if (!doesBoxCollide(candidate, cctx)) {
edge.labelBounds = candidate;
edge.element.name = text;
placedLabels.push(candidate);
return;
}
}
}
const fallbackText = wrapCandidates[0];
const dim = estimateLabelDimensions(fallbackText);
const geom: PathLabelGeom = { p1, p2, dim, margin, text: fallbackText };
const fallbackBounds = computePathSegmentLabel(geom, sides[0]);
edge.labelBounds = fallbackBounds;
placedLabels.push(fallbackBounds);
}
export function layoutAllLabels(ctx: LabelLayoutContext): void {
const placedLabels: Bounds[] = [];
for (const shape of ctx.shapes) {
if (isEvent(shape.element) || isGateway(shape.element) || isArtifact(shape.element)) {
layoutElementLabel(shape, placedLabels, ctx);
}
}
for (const edge of ctx.edges) {
if (isFlow(edge.element)) {
layoutPathLabel(edge, placedLabels, ctx);
}
}
}
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