import {Line, getAngle} from '../math/line';
import {Point2D} from '../math/point';
import {replaceFlags} from '../utils/string';
import {i18n} from '../utils/i18n';
import {getDefaultAnchor} from './editor';
// external
import Konva from 'konva';
/**
* Default draw label text.
*/
const defaultProtractorLabelText = '{angle}';
/**
* Protractor factory.
*/
export class ProtractorFactory {
/**
* Get the name of the shape group.
*
* @returns {string} The name.
*/
getGroupName() {
return 'protractor-group';
}
/**
* Get the number of points needed to build the shape.
*
* @returns {number} The number of points.
*/
getNPoints() {
return 3;
}
/**
* Get the timeout between point storage.
*
* @returns {number} The timeout in milliseconds.
*/
getTimeout() {
return 500;
}
/**
* 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 protractor shape to be displayed.
*
* @param {Array} points The points from which to extract the protractor.
* @param {object} style The drawing style.
* @param {object} _viewController The associated view controller.
* @returns {object} The Konva group.
*/
create(points, style, _viewController) {
// physical shape
const line0 = new Line(points[0], points[1]);
// points stored the Konvajs way
const pointsArray = [];
for (let i = 0; i < points.length; ++i) {
pointsArray.push(points[i].getX());
pointsArray.push(points[i].getY());
}
// draw shape
const kshape = new Konva.Line({
points: pointsArray,
stroke: style.getLineColour(),
strokeWidth: style.getStrokeWidth(),
strokeScaleEnabled: false,
name: 'shape'
});
const group = new Konva.Group();
group.name(this.getGroupName());
// text and decoration
if (points.length === 3) {
const line1 = new Line(points[1], points[2]);
// larger hitfunc
kshape.hitFunc(function (context) {
context.beginPath();
context.moveTo(points[0].getX(), points[0].getY());
context.lineTo(points[1].getX(), points[1].getY());
context.lineTo(points[2].getX(), points[2].getY());
context.closePath();
context.fillStrokeShape(kshape);
});
// quantification
let angle = getAngle(line0, line1);
let inclination = line0.getInclination();
if (angle > 180) {
angle = 360 - angle;
inclination += angle;
}
// 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 protractorLabelText !== 'undefined') {
// textExpr = protractorLabelText;
// } else {
textExpr = defaultProtractorLabelText;
// }
const quant = {
angle: {
value: angle,
unit: i18n.t('unit.degree')
}
};
ktext.setText(replaceFlags(textExpr, quant));
// augment text with meta
// @ts-ignore
ktext.meta = {
textExpr: textExpr,
quantification: quant
};
// label
const midX =
(line0.getMidpoint().getX() + line1.getMidpoint().getX()) / 2;
const midY =
(line0.getMidpoint().getY() + line1.getMidpoint().getY()) / 2;
const klabel = new Konva.Label({
x: midX,
y: midY - 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()
}));
// arc
const radius = Math.min(line0.getLength(), line1.getLength()) * 33 / 100;
const karc = new Konva.Arc({
innerRadius: radius,
outerRadius: radius,
stroke: style.getLineColour(),
strokeWidth: style.getStrokeWidth(),
strokeScaleEnabled: false,
angle: angle,
rotation: -inclination,
x: points[1].getX(),
y: points[1].getY(),
name: 'shape-arc'
});
// add to group
group.add(klabel);
group.add(karc);
}
// add shape to group
group.add(kshape);
group.visible(true); // dont inherit
// return group
return group;
}
/**
* Get anchors to update a protractor 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(), 'mid', style
));
anchors.push(getDefaultAnchor(
points[4] + shape.x(), points[5] + shape.y(), 'end', style
));
return anchors;
}
/**
* Update a protractor 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];
// associated arc
const karc = group.getChildren(function (node) {
return node.name() === 'shape-arc';
})[0];
// find special points
const begin = group.getChildren(function (node) {
return node.id() === 'begin';
})[0];
const mid = group.getChildren(function (node) {
return node.id() === 'mid';
})[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 'mid':
mid.x(anchor.x());
mid.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 mx = mid.x() - kline.x();
const my = mid.y() - kline.y();
const ex = end.x() - kline.x();
const ey = end.y() - kline.y();
kline.points([bx, by, mx, my, ex, ey]);
// larger hitfunc
kline.hitFunc(function (context) {
context.beginPath();
context.moveTo(bx, by);
context.lineTo(mx, my);
context.lineTo(ex, ey);
context.closePath();
context.fillStrokeShape(kline);
});
// update text
const p2d0 = new Point2D(begin.x(), begin.y());
const p2d1 = new Point2D(mid.x(), mid.y());
const p2d2 = new Point2D(end.x(), end.y());
const line0 = new Line(p2d0, p2d1);
const line1 = new Line(p2d1, p2d2);
let angle = getAngle(line0, line1);
let inclination = line0.getInclination();
if (angle > 180) {
angle = 360 - angle;
inclination += angle;
}
// update text
const ktext = klabel.getText();
const quantification = {
angle: {value: angle, unit: i18n.t('unit.degree')}
};
ktext.setText(replaceFlags(ktext.meta.textExpr, quantification));
// update meta
ktext.meta.quantification = quantification;
// update position
const midX = (line0.getMidpoint().getX() + line1.getMidpoint().getX()) / 2;
const midY = (line0.getMidpoint().getY() + line1.getMidpoint().getY()) / 2;
const textPos = {
x: midX,
y: midY - style.applyZoomScale(15).y
};
klabel.position(textPos);
// arc
const radius = Math.min(line0.getLength(), line1.getLength()) * 33 / 100;
karc.innerRadius(radius);
karc.outerRadius(radius);
karc.angle(angle);
karc.rotation(-inclination);
const arcPos = {x: mid.x(), y: mid.y()};
karc.position(arcPos);
}
} // class ProtractorFactory