import {
Line,
getPerpendicularLine,
getPerpendicularLineAtDistance
} from '../math/line';
import {Point2D} from '../math/point';
import {defaults} from '../app/defaults';
import {logger} from '../utils/logger';
import {
getLineShape,
DRAW_DEBUG,
getDefaultAnchor,
getAnchorShape
} from './drawBounds';
import {LabelFactory} from './labelFactory';
// external
import Konva from 'konva';
// doc imports
/* eslint-disable no-unused-vars */
import {Style} from '../gui/style';
import {Annotation} from '../image/annotation';
/* eslint-enable no-unused-vars */
/**
* Arrow factory.
*/
export class ArrowFactory {
/**
* The name of the factory.
*
* @type {string}
*/
#name = 'arrow';
/**
* The associated label factory.
*
* @type {LabelFactory}
*/
#labelFactory = new LabelFactory(this.#getDefaultLabelPosition);
/**
* Does this factory support the input math shape.
*
* @param {object} mathShape The mathematical shape.
* @returns {boolean} True if supported.
*/
static supports(mathShape) {
return mathShape instanceof Point2D;
}
/**
* Get the name of the factory.
*
* @returns {string} The name.
*/
getName() {
return this.#name;
}
/**
* Get the name of the shape group.
*
* @returns {string} The name.
*/
getGroupName() {
return this.#name + '-group';
}
/**
* Get the number of points needed to build the shape.
*
* @returns {number} The number of points.
*/
getNPoints() {
return 2;
}
/**
* Get the timeout between point storage.
*
* @returns {number} The timeout in milliseconds.
*/
getTimeout() {
return 0;
}
/**
* Set an annotation math shape from input points.
*
* @param {Annotation} annotation The annotation.
* @param {Point2D[]} points The points.
*/
setAnnotationMathShape(annotation, points) {
annotation.mathShape = this.#calculateMathShape(points);
annotation.referencePoints = [points[1]];
annotation.setTextExpr(this.#getDefaultLabel());
annotation.updateQuantification();
}
/**
* Create a line shape to be displayed.
*
* @param {Annotation} annotation The associated annotation.
* @param {Style} style The drawing style.
* @returns {Konva.Group} The Konva group.
*/
createShapeGroup(annotation, style) {
// konva group
const group = new Konva.Group();
group.name(this.getGroupName());
group.visible(true);
group.id(annotation.id);
// konva shape
const shape = this.#createShape(annotation, style);
group.add(shape);
// extras
const extras = this.#createShapeExtras(annotation, style);
for (const extra of extras) {
group.add(extra);
}
// konva label
const label = this.#labelFactory.create(annotation, style);
group.add(label);
// label-shape connector
const connectorsPos = this.#getConnectorsPositions(shape);
group.add(this.#labelFactory.getConnector(connectorsPos, label, style));
// konva shadow (if debug)
if (DRAW_DEBUG) {
group.add(this.#getDebugShadow(annotation));
}
return group;
}
/**
* Get the connectors positions for the shape.
*
* @param {Konva.Line} shape The associated shape.
* @returns {Point2D[]} The connectors positions.
*/
#getConnectorsPositions(shape) {
const points = shape.points();
const sx = shape.x();
const sy = shape.y();
const centerX = (points[0] + points[2]) / 2 + sx;
const centerY = (points[1] + points[3]) / 2 + sy;
return [new Point2D(centerX, centerY)];
}
/**
* Get the anchors positions for the shape.
*
* @param {Konva.Line} shape The associated shape.
* @returns {Point2D[]} The anchor positions.
*/
#getAnchorsPositions(shape) {
const points = shape.points();
const sx = shape.x();
const sy = shape.y();
return [
new Point2D(points[0] + sx, points[1] + sy),
new Point2D(points[2] + sx, points[3] + sy)
];
}
/**
* Get anchors to update a line shape.
*
* @param {Konva.Line} shape The associated shape.
* @param {Style} style The application style.
* @returns {Konva.Ellipse[]} A list of anchors.
*/
getAnchors(shape, style) {
const positions = this.#getAnchorsPositions(shape);
const anchors = [];
for (let i = 0; i < positions.length; ++i) {
anchors.push(getDefaultAnchor(
positions[i].getX(),
positions[i].getY(),
'anchor' + i,
style
));
}
return anchors;
}
/**
* Constrain anchor movement.
*
* @param {Konva.Ellipse} _anchor The active anchor.
*/
constrainAnchorMove(_anchor) {
// no constraints
}
/**
* Update shape and label on anchor move taking the updated
* annotation as input.
*
* @param {Annotation} annotation The associated annotation.
* @param {Konva.Ellipse} anchor The active anchor.
* @param {Style} style The application style.
*/
updateShapeGroupOnAnchorMove(annotation, anchor, style) {
// parent group
const group = anchor.getParent();
if (!(group instanceof Konva.Group)) {
return;
}
// update shape and anchors
this.#updateShape(annotation, anchor, style);
// update label
this.updateLabelContent(annotation, group, style);
// label position
if (typeof annotation.labelPosition === 'undefined') {
// update label position if default position
this.#labelFactory.updatePosition(annotation, group);
} else {
// update connector if not default position
this.updateConnector(group);
}
// update shadow
if (DRAW_DEBUG) {
this.#updateDebugShadow(annotation, group);
}
}
/**
* Update an annotation on anchor move.
*
* @param {Annotation} annotation The annotation.
* @param {Konva.Shape} anchor The anchor.
*/
updateAnnotationOnAnchorMove(annotation, anchor) {
// parent group
const group = anchor.getParent();
if (!(group instanceof Konva.Group)) {
return;
}
// associated shape
const kline = this.#getShape(group);
// find anchors
const begin = getAnchorShape(group, 0);
const end = getAnchorShape(group, 1);
// math shape
// compensate for possible shape drag
const pointBegin = new Point2D(
begin.x() - kline.x(),
begin.y() - kline.y()
);
const pointEnd = new Point2D(
end.x() - kline.x(),
end.y() - kline.y()
);
annotation.mathShape = pointBegin;
annotation.referencePoints = [pointEnd];
// quantification
annotation.updateQuantification();
}
/**
* Update an annotation on translation (shape move).
*
* @param {Annotation} annotation The annotation.
* @param {object} translation The translation.
*/
updateAnnotationOnTranslation(annotation, translation) {
// math shape
const point = annotation.mathShape;
const endPoint = annotation.referencePoints[0];
const line = new Line(point, endPoint);
const begin = line.getBegin();
const newBegin = new Point2D(
begin.getX() + translation.x,
begin.getY() + translation.y
);
const end = line.getEnd();
const newEnd = new Point2D(
end.getX() + translation.x,
end.getY() + translation.y
);
annotation.mathShape = newBegin;
annotation.referencePoints = [newEnd];
// quantification
annotation.updateQuantification();
}
/**
* Update the shape label.
*
* @param {Annotation} annotation The associated annotation.
* @param {Konva.Group} group The shape group.
* @param {Style} _style The application style.
*/
updateLabelContent(annotation, group, _style) {
this.#labelFactory.updateContent(annotation, group);
}
/**
* Update the shape connector.
*
* @param {Konva.Group} group The shape group.
*/
updateConnector(group) {
const kshape = this.#getShape(group);
const connectorsPos = this.#getConnectorsPositions(kshape);
this.#labelFactory.updateConnector(group, connectorsPos);
}
/**
* Calculate the mathematical shape from a list of points.
*
* @param {Point2D[]} points The points that define the shape.
* @returns {Point2D} The mathematical shape.
*/
#calculateMathShape(points) {
return points[0];
}
/**
* Get the default labels.
*
* @returns {object} The label list.
*/
#getDefaultLabel() {
return defaults.labelText.arrow;
}
/**
* Creates the konva shape.
*
* @param {Annotation} annotation The associated annotation.
* @param {Style} style The drawing style.
* @returns {Konva.Line} The konva shape.
*/
#createShape(annotation, style) {
const point = annotation.mathShape;
const endPoint = annotation.referencePoints[0];
const line = new Line(point, endPoint);
// konva line
const kshape = new Konva.Line({
points: [
point.getX(),
point.getY(),
endPoint.getX(),
endPoint.getY()
],
stroke: annotation.colour,
strokeWidth: style.getStrokeWidth(),
strokeScaleEnabled: false,
name: 'shape'
});
// larger hitfunc
const tickLen = 20;
const linePerp0 = getPerpendicularLine(
line, point, tickLen, style.getZoomScale());
const linePerp1 = getPerpendicularLine(
line, endPoint, tickLen, style.getZoomScale());
kshape.hitFunc(function (context) {
context.beginPath();
context.moveTo(linePerp0.getBegin().getX(), linePerp0.getBegin().getY());
context.lineTo(linePerp0.getEnd().getX(), linePerp0.getEnd().getY());
context.lineTo(linePerp1.getEnd().getX(), linePerp1.getEnd().getY());
context.lineTo(linePerp1.getBegin().getX(), linePerp1.getBegin().getY());
context.closePath();
context.fillStrokeShape(kshape);
});
return kshape;
}
/**
* Get the associated shape from a group.
*
* @param {Konva.Group} group The group to look into.
* @returns {Konva.Line|undefined} The shape.
*/
#getShape(group) {
return getLineShape(group);
}
/**
* Creates the konva shape extras.
*
* @param {Annotation} annotation The associated annotation.
* @param {Style} style The drawing style.
* @returns {Array} The konva shape extras.
*/
#createShapeExtras(annotation, style) {
const point = annotation.mathShape;
const endPoint = annotation.referencePoints[0];
const line = new Line(point, endPoint);
const tickLen = 20;
// perpendicular line at 2*tickLen
const perpLine = getPerpendicularLineAtDistance(
line, 2 * tickLen, tickLen, style.getZoomScale());
// triangle
const ktriangle = new Konva.Line({
points: [
line.getBegin().getX(),
line.getBegin().getY(),
perpLine.getBegin().getX(),
perpLine.getBegin().getY(),
perpLine.getEnd().getX(),
perpLine.getEnd().getY(),
],
fill: annotation.colour,
strokeWidth: style.getStrokeWidth(),
strokeScaleEnabled: false,
closed: true,
name: 'shape-triangle'
});
return [ktriangle];
}
/**
* Get the default annotation label position.
*
* @param {Annotation} annotation The annotation.
* @returns {Point2D} The position.
*/
#getDefaultLabelPosition(annotation) {
const point = annotation.mathShape;
return point;
}
/**
* Update shape and label on anchor move taking the updated
* annotation as input.
*
* @param {Annotation} annotation The associated annotation.
* @param {Konva.Ellipse} anchor The active anchor.
* @param {Style} style The application style.
*/
#updateShape(annotation, anchor, style) {
const point = annotation.mathShape;
const endPoint = annotation.referencePoints[0];
const line = new Line(point, endPoint);
// parent group
const group = anchor.getParent();
if (!(group instanceof Konva.Group)) {
return;
}
// associated shape
const kline = this.#getShape(group);
// reset position after possible shape drag
kline.position({x: 0, y: 0});
// update shape
kline.points([
point.getX(),
point.getY(),
endPoint.getX(),
endPoint.getY(),
]);
// associated triangle shape
const ktriangle = group.getChildren(function (node) {
return node.name() === 'shape-triangle';
})[0];
if (!(ktriangle instanceof Konva.Line)) {
return;
}
// find anchors
const begin = getAnchorShape(group, 0);
const end = getAnchorShape(group, 1);
// update 'self' (undo case)
switch (anchor.id()) {
case 'anchor0':
begin.x(anchor.x());
begin.y(anchor.y());
break;
case 'anchor1':
end.x(anchor.x());
end.y(anchor.y());
break;
default:
logger.error('Unhandled anchor id: ' + anchor.id());
break;
}
const tickLen = 20;
// triangle
const perpLine = getPerpendicularLineAtDistance(
line, 2 * tickLen, tickLen, style.getZoomScale());
ktriangle.position({x: 0, y: 0});
ktriangle.points([
line.getBegin().getX(),
line.getBegin().getY(),
perpLine.getBegin().getX(),
perpLine.getBegin().getY(),
perpLine.getEnd().getX(),
perpLine.getEnd().getY(),
]);
// larger hitfunc
const linePerp0 = getPerpendicularLine(
line, point, tickLen, style.getZoomScale());
const linePerp1 = getPerpendicularLine(
line, endPoint, tickLen, style.getZoomScale());
kline.hitFunc(function (context) {
context.beginPath();
context.moveTo(linePerp0.getBegin().getX(), linePerp0.getBegin().getY());
context.lineTo(linePerp0.getEnd().getX(), linePerp0.getEnd().getY());
context.lineTo(linePerp1.getEnd().getX(), linePerp1.getEnd().getY());
context.lineTo(linePerp1.getBegin().getX(), linePerp1.getBegin().getY());
context.closePath();
context.fillStrokeShape(kline);
});
}
/**
* Get the debug shadow.
*
* @param {Annotation} _annotation The annotation to shadow.
* @param {Konva.Group} [_group] The associated group.
* @returns {Konva.Group|undefined} The shadow konva group.
*/
#getDebugShadow(_annotation, _group) {
return;
}
/**
* Update the debug shadow.
*
* @param {Annotation} _annotation The annotation to shadow.
* @param {Konva.Group} _group The associated group.
*/
#updateDebugShadow(_annotation, _group) {
// does nothing
}
} // class ArrowFactory