import {Point2D} from '../math/point';
import {Line, getPerpendicularLine, getAngle} from '../math/line';
import {getDefaultAnchor} from './editor';
// external
import Konva from 'konva';
/**
* Default draw label text.
*/
const defaultArrowLabelText = '';
/**
* Arrow factory.
*/
export class ArrowFactory {
/**
* Get the name of the shape group.
*
* @returns {string} The name.
*/
getGroupName() {
return 'line-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;
}
/**
* 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 an arrow 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 object.
*/
create(points, style, _viewController) {
// physical shape
const line = new Line(points[0], points[1]);
// draw shape
const kshape = new Konva.Line({
points: [line.getBegin().getX(),
line.getBegin().getY(),
line.getEnd().getX(),
line.getEnd().getY()],
stroke: style.getLineColour(),
strokeWidth: style.getStrokeWidth(),
strokeScaleEnabled: false,
name: 'shape'
});
// larger hitfunc
const linePerp0 = getPerpendicularLine(
line, points[0], style.scale(10));
const linePerp1 = getPerpendicularLine(
line, points[1], style.scale(10));
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);
});
// triangle
const beginTy = new Point2D(
line.getBegin().getX(),
line.getBegin().getY() - 10);
const verticalLine = new Line(line.getBegin(), beginTy);
const angle = getAngle(line, verticalLine);
const angleRad = angle * Math.PI / 180;
const radius = 5 * style.getScaledStrokeWidth();
const kpoly = new Konva.RegularPolygon({
x: line.getBegin().getX() + radius * Math.sin(angleRad),
y: line.getBegin().getY() + radius * Math.cos(angleRad),
sides: 3,
radius: radius,
rotation: -angle,
fill: style.getLineColour(),
strokeWidth: style.getStrokeWidth(),
strokeScaleEnabled: false,
name: 'shape-triangle'
});
// quantification
const ktext = new Konva.Text({
fontSize: style.getFontSize(),
fontFamily: style.getFontFamily(),
fill: style.getLineColour(),
padding: style.getTextPadding(),
shadowColor: style.getShadowLineColour(),
shadowOffset: style.getShadowOffset(),
name: 'text'
});
let textExpr = '';
// TODO: allow override?
// if (typeof arrowLabelText !== 'undefined') {
// textExpr = arrowLabelText;
// } else {
textExpr = defaultArrowLabelText;
// }
ktext.setText(textExpr);
// augment text with meta data
// @ts-ignore
ktext.meta = {
textExpr: textExpr,
quantification: {}
};
// label
const dX = line.getBegin().getX() > line.getEnd().getX() ? 0 : -1;
const dY = line.getBegin().getY() > line.getEnd().getY() ? -1 : 0;
const klabel = new Konva.Label({
x: line.getEnd().getX() + dX * ktext.width(),
y: line.getEnd().getY() + dY * style.applyZoomScale(15).y,
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(kpoly);
group.add(kshape);
group.visible(true); // dont inherit
return group;
}
/**
* Get anchors to update an arrow 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 = [];
anchors.push(getDefaultAnchor(
points[0] + shape.x(), points[1] + shape.y(), 'begin', style
));
anchors.push(getDefaultAnchor(
points[2] + shape.x(), points[3] + shape.y(), 'end', style
));
return anchors;
}
/**
* Update an arrow 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 triangle shape
const ktriangle = group.getChildren(function (node) {
return node.name() === 'shape-triangle';
})[0];
// associated label
const klabel = group.getChildren(function (node) {
return node.name() === 'label';
})[0];
// find special points
const begin = group.getChildren(function (node) {
return node.id() === 'begin';
})[0];
const end = group.getChildren(function (node) {
return node.id() === 'end';
})[0];
// update special points
switch (anchor.id()) {
case 'begin':
begin.x(anchor.x());
begin.y(anchor.y());
break;
case 'end':
end.x(anchor.x());
end.y(anchor.y());
break;
}
// update shape and compensate for possible drag
// note: shape.position() and shape.size() won't work...
const bx = begin.x() - kline.x();
const by = begin.y() - kline.y();
const ex = end.x() - kline.x();
const ey = end.y() - kline.y();
kline.points([bx, by, ex, ey]);
// new line
const p2d0 = new Point2D(begin.x(), begin.y());
const p2d1 = new Point2D(end.x(), end.y());
const line = new Line(p2d0, p2d1);
// larger hitfunc
const p2b = new Point2D(bx, by);
const p2e = new Point2D(ex, ey);
const linePerp0 = getPerpendicularLine(line, p2b, 10);
const linePerp1 = getPerpendicularLine(line, p2e, 10);
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);
});
// udate triangle
const beginTy = new Point2D(
line.getBegin().getX(),
line.getBegin().getY() - 10);
const verticalLine = new Line(line.getBegin(), beginTy);
const angle = getAngle(line, verticalLine);
const angleRad = angle * Math.PI / 180;
ktriangle.x(
line.getBegin().getX() + ktriangle.radius() * Math.sin(angleRad));
ktriangle.y(
line.getBegin().getY() + ktriangle.radius() * Math.cos(angleRad));
ktriangle.rotation(-angle);
// update text
const ktext = klabel.getText();
ktext.setText(ktext.meta.textExpr);
// update position
const dX = line.getBegin().getX() > line.getEnd().getX() ? 0 : -1;
const dY = line.getBegin().getY() > line.getEnd().getY() ? -1 : 0;
const textPos = {
x: line.getEnd().getX() + dX * ktext.width(),
y: line.getEnd().getY() + dY * style.applyZoomScale(15).y
};
klabel.position(textPos);
}
} // class ArrowFactory