import {getDefaultAnchor} from './editor';
// external
import Konva from 'konva';
/**
* Default draw label text.
*/
const defaultFreeHandLabelText = '';
/**
* FreeHand factory.
*/
export class FreeHandFactory {
/**
* Get the name of the shape group.
*
* @returns {string} The name.
*/
getGroupName() {
return 'freeHand-group';
}
/**
* Get the number of points needed to build the shape.
*
* @returns {number|undefined} The number of points.
*/
getNPoints() {
// undefined to end with double click
return undefined;
}
/**
* Get the timeout between point storage.
*
* @returns {number} The timeout in milliseconds.
*/
getTimeout() {
return 25;
}
/**
* Is the input group a group of this factory?
*
* @param {object} group The group to test.
* @returns {boolean} True if the group is from this fcatory.
*/
isFactoryGroup(group) {
return this.getGroupName() === group.name();
}
/**
* Create a roi shape to be displayed.
*
* @param {Array} points The points from which to extract the line.
* @param {object} style The drawing style.
* @param {object} _viewController The associated view controller.
* @returns {object} The Konva group.
*/
create(
points, style, _viewController) {
// points stored the Konvajs way
const arr = [];
for (let i = 0; i < points.length; ++i) {
arr.push(points[i].getX());
arr.push(points[i].getY());
}
// draw shape
const kshape = new Konva.Line({
points: arr,
stroke: style.getLineColour(),
strokeWidth: style.getStrokeWidth(),
strokeScaleEnabled: false,
name: 'shape',
tension: 0.5
});
// text
const ktext = new Konva.Text({
fontSize: style.getFontSize(),
fontFamily: style.getFontFamily(),
fill: style.getLineColour(),
name: 'text'
});
let textExpr = '';
// TODO: allow override?
// if (typeof freeHandLabelText !== 'undefined') {
// textExpr = freeHandLabelText;
// } else {
textExpr = defaultFreeHandLabelText;
// }
ktext.setText(textExpr);
// augment text with meta
// @ts-ignore
ktext.meta = {
textExpr: textExpr,
quantification: {}
};
// label
const klabel = new Konva.Label({
x: points[0].getX(),
y: points[0].getY() + style.scale(10),
scale: style.applyZoomScale(1),
visible: textExpr.length !== 0,
name: 'label'
});
klabel.add(ktext);
klabel.add(new Konva.Tag({
fill: style.getLineColour(),
opacity: style.getTagOpacity()
}));
// return group
const group = new Konva.Group();
group.name(this.getGroupName());
group.add(klabel);
group.add(kshape);
group.visible(true); // dont inherit
return group;
}
/**
* Get anchors to update a free hand shape.
*
* @param {object} shape The associated shape.
* @param {object} style The application style.
* @returns {Array} A list of anchors.
*/
getAnchors(shape, style) {
const points = shape.points();
const anchors = [];
for (let i = 0; i < points.length; i = i + 2) {
const px = points[i] + shape.x();
const py = points[i + 1] + shape.y();
const name = i.toString();
anchors.push(getDefaultAnchor(
px, py, name, style
));
}
return anchors;
}
/**
* Update a FreeHand shape.
*
* @param {object} anchor The active anchor.
* @param {object} style The app style.
* @param {object} _viewController The associated view controller.
*/
update(anchor, style, _viewController) {
// parent group
const group = anchor.getParent();
// associated shape
const kline = group.getChildren(function (node) {
return node.name() === 'shape';
})[0];
// associated label
const klabel = group.getChildren(function (node) {
return node.name() === 'label';
})[0];
// update self
const point = group.getChildren(function (node) {
return node.id() === anchor.id();
})[0];
point.x(anchor.x());
point.y(anchor.y());
// update the roi point and compensate for possible drag
// (the anchor id is the index of the point in the list)
const points = kline.points();
points[anchor.id()] = anchor.x() - kline.x();
points[anchor.id() + 1] = anchor.y() - kline.y();
// concat to make Konva think it is a new array
kline.points(points.concat());
// update text
const ktext = klabel.getText();
ktext.setText(ktext.meta.textExpr);
// update position
const textPos = {
x: points[0] + kline.x(),
y: points[1] + kline.y() + style.scale(10)
};
klabel.position(textPos);
}
} // class FreeHandFactory