import {Circle} from '../math/circle';
import {Point2D} from '../math/point';
import {getFlags, replaceFlags} from '../utils/string';
import {logger} from '../utils/logger';
import {getDefaultAnchor} from './editor';
import {DRAW_DEBUG} from './draw';
// external
import Konva from 'konva';
/**
* Default draw label text.
*/
const defaultCircleLabelText = '{surface}';
/**
* Circle factory.
*/
export class CircleFactory {
/**
* Get the name of the shape group.
*
* @returns {string} The name.
*/
getGroupName() {
return 'circle-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 a circle shape to be displayed.
*
* @param {Array} points The points from which to extract the circle.
* @param {object} style The drawing style.
* @param {object} viewController The associated view controller.
* @returns {object} The Konva group.
*/
create(
points, style, viewController) {
// calculate radius
const a = Math.abs(points[0].getX() - points[1].getX());
const b = Math.abs(points[0].getY() - points[1].getY());
const radius = Math.round(Math.sqrt(a * a + b * b));
// physical shape
const circle = new Circle(points[0], radius);
// draw shape
const kshape = new Konva.Circle({
x: circle.getCenter().getX(),
y: circle.getCenter().getY(),
radius: circle.getRadius(),
stroke: style.getLineColour(),
strokeWidth: style.getStrokeWidth(),
strokeScaleEnabled: false,
name: 'shape'
});
// 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 circleLabelText !== 'undefined') {
// textExpr = circleLabelText;
// } else {
textExpr = defaultCircleLabelText;
// }
const quant = circle.quantify(
viewController,
getFlags(textExpr));
ktext.setText(replaceFlags(textExpr, quant));
// augment text with meta data
// @ts-ignore
ktext.meta = {
textExpr: textExpr,
quantification: quant
};
// label
const klabel = new Konva.Label({
x: circle.getCenter().getX(),
y: circle.getCenter().getY(),
scale: style.applyZoomScale(1),
visible: textExpr.length !== 0,
name: 'label'
});
klabel.add(ktext);
klabel.add(new Konva.Tag({
fill: style.getLineColour(),
opacity: style.getTagOpacity()
}));
// debug shadow
let kshadow;
if (DRAW_DEBUG) {
kshadow = this.#getShadowCircle(circle);
}
// return group
const group = new Konva.Group();
group.name(this.getGroupName());
if (kshadow) {
group.add(kshadow);
}
group.add(klabel);
group.add(kshape);
group.visible(true); // dont inherit
return group;
}
/**
* Get anchors to update a circle shape.
*
* @param {object} shape The associated shape.
* @param {object} style The application style.
* @returns {Array} A list of anchors.
*/
getAnchors(shape, style) {
const centerX = shape.x();
const centerY = shape.y();
const radius = shape.radius();
const anchors = [];
anchors.push(getDefaultAnchor(
centerX - radius, centerY, 'left', style
));
anchors.push(getDefaultAnchor(
centerX + radius, centerY, 'right', style
));
anchors.push(getDefaultAnchor(
centerX, centerY - radius, 'bottom', style
));
anchors.push(getDefaultAnchor(
centerX, centerY + radius, 'top', style
));
return anchors;
}
/**
* Update a circle 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 kcircle = group.getChildren(function (node) {
return node.name() === 'shape';
})[0];
// associated label
const klabel = group.getChildren(function (node) {
return node.name() === 'label';
})[0];
// find special points
const left = group.getChildren(function (node) {
return node.id() === 'left';
})[0];
const right = group.getChildren(function (node) {
return node.id() === 'right';
})[0];
const bottom = group.getChildren(function (node) {
return node.id() === 'bottom';
})[0];
const top = group.getChildren(function (node) {
return node.id() === 'top';
})[0];
// debug shadow
let kshadow;
if (DRAW_DEBUG) {
kshadow = group.getChildren(function (node) {
return node.name() === 'shadow';
})[0];
}
// circle center
const center = {
x: kcircle.x(),
y: kcircle.y()
};
let radius;
// update 'self' (undo case) and special points
switch (anchor.id()) {
case 'left':
radius = center.x - anchor.x();
// force y
left.y(right.y());
// update others
right.x(center.x + radius);
bottom.y(center.y - radius);
top.y(center.y + radius);
break;
case 'right':
radius = anchor.x() - center.x;
// force y
right.y(left.y());
// update others
left.x(center.x - radius);
bottom.y(center.y - radius);
top.y(center.y + radius);
break;
case 'bottom':
radius = center.y - anchor.y();
// force x
bottom.x(top.x());
// update others
left.x(center.x - radius);
right.x(center.x + radius);
top.y(center.y + radius);
break;
case 'top':
radius = anchor.y() - center.y;
// force x
top.x(bottom.x());
// update others
left.x(center.x - radius);
right.x(center.x + radius);
bottom.y(center.y - radius);
break;
default :
logger.error('Unhandled anchor id: ' + anchor.id());
break;
}
// update shape: just update the radius
kcircle.radius(Math.abs(radius));
// new circle
const centerPoint = new Point2D(
group.x() + center.x,
group.y() + center.y
);
const circle = new Circle(centerPoint, radius);
// debug shadow
if (kshadow) {
// remove previous
kshadow.destroy();
// add new
group.add(this.#getShadowCircle(circle, group));
}
// update label position
const textPos = {x: center.x, y: center.y};
klabel.position(textPos);
// update quantification
this.#updateCircleQuantification(group, viewController);
}
/**
* Update the quantification of a Circle.
*
* @param {object} group The group with the shape.
* @param {object} viewController The associated view controller.
*/
updateQuantification(group, viewController) {
this.#updateCircleQuantification(group, viewController);
}
/**
* Update the quantification of a Circle (as a static
* function to be used in update).
*
* @param {object} group The group with the shape.
* @param {object} viewController The associated view controller.
*/
#updateCircleQuantification(
group, viewController) {
// associated shape
const kcircle = group.getChildren(function (node) {
return node.name() === 'shape';
})[0];
// associated label
const klabel = group.getChildren(function (node) {
return node.name() === 'label';
})[0];
// positions: add possible group offset
const centerPoint = new Point2D(
group.x() + kcircle.x(),
group.y() + kcircle.y()
);
// circle
const circle = new Circle(centerPoint, kcircle.radius());
// update text
const ktext = klabel.getText();
const quantification = circle.quantify(
viewController,
getFlags(ktext.meta.textExpr));
ktext.setText(replaceFlags(ktext.meta.textExpr, quantification));
// update meta
ktext.meta.quantification = quantification;
}
/**
* Get the debug shadow.
*
* @param {Circle} circle The circle to shadow.
* @param {object} group The associated group.
* @returns {object} The shadow konva group.
*/
#getShadowCircle(circle, group) {
// possible group offset
let offsetX = 0;
let offsetY = 0;
if (typeof group !== 'undefined') {
offsetX = group.x();
offsetY = group.y();
}
const kshadow = new Konva.Group();
kshadow.name('shadow');
const regions = circle.getRound();
for (let i = 0; i < regions.length; ++i) {
const region = regions[i];
const minX = region[0][0];
const minY = region[0][1];
const maxX = region[1][0];
const pixelLine = new Konva.Rect({
x: minX - offsetX,
y: minY - offsetY,
width: maxX - minX,
height: 1,
fill: 'grey',
strokeWidth: 0,
strokeScaleEnabled: false,
opacity: 0.3,
name: 'shadow-element'
});
kshadow.add(pixelLine);
}
return kshadow;
}
} // class CircleFactory