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elements.js
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elements.js
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/*
* Copyright 2019 Abakkk
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* SPDX-FileCopyrightText: 2019 Abakkk
* SPDX-License-Identifier: GPL-3.0-or-later
*/
/* jslint esversion: 6 */
/* exported Shape, TextAlignment, Transformation, getAllFontFamilies, DrawingElement */
import Cairo from 'cairo';
import Clutter from 'gi://Clutter';
import GObject from 'gi://GObject';
import Pango from 'gi://Pango';
import PangoCairo from 'gi://PangoCairo';
import { CURATED_UUID as UUID } from './utils.js';
export const StaticColor = {
WHITE: Clutter.Color.new(255, 255, 255, 255),
BLUE: Clutter.Color.new(0, 0, 255, 255),
TRANSPARENT: Clutter.Color.new(0, 0, 0, 0),
BLACK: Clutter.Color.new(0, 0, 0, 255),
GRAY: Clutter.Color.new(160, 160, 164, 255),
RED: Clutter.Color.new(255, 0, 0, 255)
}
export const Shape = { NONE: 0, LINE: 1, ELLIPSE: 2, RECTANGLE: 3, TEXT: 4, POLYGON: 5, POLYLINE: 6, IMAGE: 7 };
export const TextAlignment = { LEFT: 0, CENTER: 1, RIGHT: 2 };
export const Transformation = { TRANSLATION: 0, ROTATION: 1, SCALE_PRESERVE: 2, STRETCH: 3, REFLECTION: 4, INVERSION: 5, SMOOTH: 100 };
export const getAllFontFamilies = function() {
return PangoCairo.font_map_get_default().list_families().map(fontFamily => fontFamily.get_name()).sort((a,b) => a.localeCompare(b));
};
const getFillRuleSvgName = function(fillRule) {
return fillRule == Cairo.FillRule.EVEN_ODD ? 'evenodd' : 'nonzero';
};
const getLineCapSvgName = function(lineCap) {
return lineCap == Cairo.LineCap.BUTT ? 'butt' :
lineCap == Cairo.LineCap.SQUASH ? 'square' :
'round';
};
const getLineJoinSvgName = function(lineJoin) {
return lineJoin == Cairo.LineJoin.MITER ? 'miter' :
lineJoin == Cairo.LineJoin.BEVEL ? 'bevel' :
'round';
};
const SVG_DEBUG_SUPERPOSES_CAIRO = false;
const RADIAN = 180 / Math.PI; // degree
const INVERSION_CIRCLE_RADIUS = 12; // px
const REFLECTION_TOLERANCE = 5; // px, to select vertical and horizontal directions
const STRETCH_TOLERANCE = Math.PI / 8; // rad, to select vertical and horizontal directions
const MIN_REFLECTION_LINE_LENGTH = 10; // px
const MIN_TRANSLATION_DISTANCE = 1; // px
const MIN_ROTATION_ANGLE = Math.PI / 1000; // rad
const MIN_DRAWING_SIZE = 3; // px
const MIN_INTERMEDIATE_POINT_DISTANCE = 1; // px, the higher it is, the fewer points there will be
const MARK_COLOR = StaticColor.BLUE
export const DrawingElement = function(params) {
return params.shape == Shape.TEXT ? new TextElement(params) :
params.shape == Shape.IMAGE ? new ImageElement(params) :
new _DrawingElement(params);
};
// DrawingElement represents a "brushstroke".
// It can be converted into a cairo path as well as a svg element.
// See DrawingArea._startDrawing() to know its params.
const _DrawingElement = GObject.registerClass({
GTypeName: `${UUID}-DrawingElement`,
}, class _DrawingElement extends GObject.Object{
_init(params) {
for (let key in params)
this[key] = params[key];
// compatibility with json generated by old extension versions
if (params.transformations === undefined)
this.transformations = [];
if (params.font && !(params.font instanceof Pango.FontDescription)) {
// compatibility with v6.2-
if (params.font.weight === 0)
this.font.weight = 400;
else if (params.font.weight === 1)
this.font.weight = 700;
this.font = new Pango.FontDescription();
['family', 'weight', 'style', 'stretch', 'variant'].forEach(attribute => {
if (params.font[attribute] !== undefined)
try {
this.font[`set_${attribute}`](params.font[attribute]);
} catch(e) {}
});
}
if (params.transform?.center) {
let angle = (params.transform.angle || 0) + (params.transform.startAngle || 0);
if (angle)
this.transformations.push({ type: Transformation.ROTATION, angle: angle });
}
if (params.shape == Shape.ELLIPSE && params.transform && params.transform.ratio && params.transform.ratio != 1 && params.points.length >= 2) {
let [ratio, p0, p1] = [params.transform.ratio, params.points[0], params.points[1]];
// Add a fake point that will give the right ellipse ratio when building the element.
this.points.push([ratio * (p1[0] - p0[0]) + p0[0], ratio * (p1[1] - p0[1]) + p0[1]]);
}
delete this.transform;
// v10-
if (this.textRightAligned)
this.textAlignment = TextAlignment.RIGHT;
delete this.textRightAligned;
}
// toJSON is called by JSON.stringify
toJSON() {
return {
shape: this.shape,
color: this.color,
line: this.line,
dash: this.dash,
fill: this.fill,
fillRule: this.fillRule,
eraser: this.eraser,
transformations: this.transformations.filter(transformation => transformation.type != Transformation.SMOOTH)
.map(transformation => Object.assign({}, transformation, { undoable: undefined })),
points: this.points.map((point) => [Math.round(point[0]*100)/100, Math.round(point[1]*100)/100])
};
}
buildCairo(cr, params) {
if (this.color)
cr.setSourceColor(this.color);
if (this.line) {
cr.setLineCap(this.line.lineCap);
cr.setLineJoin(this.line.lineJoin);
cr.setLineWidth(this.line.lineWidth);
}
if (this.fillRule)
cr.setFillRule(this.fillRule);
if (this.dash?.active && this.dash.array && this.dash.array[0] && this.dash.array[1])
cr.setDash(this.dash.array, this.dash.offset);
if (this.eraser)
cr.setOperator(Cairo.Operator.CLEAR);
else
cr.setOperator(Cairo.Operator.OVER);
if (params.dummyStroke)
setDummyStroke(cr);
if (SVG_DEBUG_SUPERPOSES_CAIRO) {
cr.setSourceColor(StaticColor.RED);
cr.setLineWidth(this.line.lineWidth / 2 || 1);
}
this.transformations.slice(0).reverse().forEach(transformation => {
if (transformation.type == Transformation.TRANSLATION) {
cr.translate(transformation.slideX, transformation.slideY);
} else if (transformation.type == Transformation.ROTATION) {
let center = this._getTransformedCenter(transformation);
cr.translate(center[0], center[1]);
cr.rotate(transformation.angle);
cr.translate(-center[0], -center[1]);
} else if (transformation.type == Transformation.SCALE_PRESERVE || transformation.type == Transformation.STRETCH) {
let center = this._getTransformedCenter(transformation);
cr.translate(center[0], center[1]);
cr.rotate(transformation.angle);
cr.scale(transformation.scaleX, transformation.scaleY);
cr.rotate(-transformation.angle);
cr.translate(-center[0], -center[1]);
} else if (transformation.type == Transformation.REFLECTION || transformation.type == Transformation.INVERSION) {
cr.translate(transformation.slideX, transformation.slideY);
cr.rotate(transformation.angle);
cr.scale(transformation.scaleX, transformation.scaleY);
cr.rotate(-transformation.angle);
cr.translate(-transformation.slideX, -transformation.slideY);
}
});
this._drawCairo(cr, params);
cr.identityMatrix();
}
_addMarks(cr) {
if (this.showSymmetryElement) {
setDummyStroke(cr);
cr.setSourceColor(MARK_COLOR);
let transformation = this.lastTransformation;
if (transformation.type == Transformation.REFLECTION) {
cr.moveTo(transformation.startX, transformation.startY);
cr.lineTo(transformation.endX, transformation.endY);
} else {
cr.arc(transformation.endX, transformation.endY, INVERSION_CIRCLE_RADIUS, 0, 2 * Math.PI);
}
cr.stroke();
}
if (this.showRotationCenter) {
setDummyStroke(cr);
cr.setSourceColor(MARK_COLOR);
let center = this._getTransformedCenter(this.lastTransformation);
cr.arc(center[0], center[1], INVERSION_CIRCLE_RADIUS, 0, 2 * Math.PI);
cr.stroke();
}
if (this.showStretchAxes) {
setDummyStroke(cr);
cr.setSourceColor(MARK_COLOR);
let center = this._getTransformedCenter(this.lastTransformation);
for (let i = 0; i <=1; i++) {
cr.moveTo(center[0] - 1000 * Math.cos(i * Math.PI / 2), center[1] - 1000 * Math.sin(i * Math.PI / 2));
cr.lineTo(center[0] + 1000 * Math.cos(i * Math.PI / 2), center[1] + 1000 * Math.sin(i * Math.PI / 2));
}
cr.stroke();
}
}
_drawCairo(cr, params) {
let [points, shape] = [this.points, this.shape];
if (shape == Shape.LINE && points.length == 3) {
cr.moveTo(points[0][0], points[0][1]);
cr.curveTo(points[0][0], points[0][1], points[1][0], points[1][1], points[2][0], points[2][1]);
} else if (shape == Shape.LINE && points.length == 4) {
cr.moveTo(points[0][0], points[0][1]);
cr.curveTo(points[1][0], points[1][1], points[2][0], points[2][1], points[3][0], points[3][1]);
} else if (shape == Shape.NONE || shape == Shape.LINE) {
cr.moveTo(points[0][0], points[0][1]);
for (let j = 1; j < points.length; j++) {
cr.lineTo(points[j][0], points[j][1]);
}
} else if (shape == Shape.ELLIPSE && points.length >= 2) {
let radius = Math.hypot(points[1][0] - points[0][0], points[1][1] - points[0][1]);
let ratio = 1;
if (points[2]) {
ratio = Math.hypot(points[2][0] - points[0][0], points[2][1] - points[0][1]) / radius;
cr.translate(points[0][0], points[0][1]);
cr.scale(ratio, 1);
cr.translate(-points[0][0], -points[0][1]);
cr.arc(points[0][0], points[0][1], radius, 0, 2 * Math.PI);
cr.translate(points[0][0], points[0][1]);
cr.scale(1 / ratio, 1);
cr.translate(-points[0][0], -points[0][1]);
} else
cr.arc(points[0][0], points[0][1], radius, 0, 2 * Math.PI);
} else if (shape == Shape.RECTANGLE && points.length == 2) {
cr.rectangle(points[0][0], points[0][1], points[1][0] - points[0][0], points[1][1] - points[0][1]);
} else if ((shape == Shape.POLYGON || shape == Shape.POLYLINE) && points.length >= 2) {
cr.moveTo(points[0][0], points[0][1]);
for (let j = 1; j < points.length; j++) {
cr.lineTo(points[j][0], points[j][1]);
}
if (shape == Shape.POLYGON)
cr.closePath();
}
}
getContainsPoint(cr, x, y) {
cr.save();
cr.setLineWidth(Math.max(this.line.lineWidth, 25));
cr.setDash([], 0);
// Check whether the point is inside/on/near the element.
let inElement = cr.inStroke(x, y) || this.fill && cr.inFill(x, y);
cr.restore();
return inElement;
}
buildSVG(bgcolorString) {
let transforms = [];
this.transformations.slice(0).reverse().forEach(transformation => {
let center = this._getTransformedCenter(transformation);
if (transformation.type == Transformation.TRANSLATION) {
transforms.push(['translate', transformation.slideX, transformation.slideY]);
} else if (transformation.type == Transformation.ROTATION) {
transforms.push(['translate', center[0], center[1]]);
transforms.push(['rotate', transformation.angle * RADIAN]);
transforms.push(['translate', -center[0], -center[1]]);
} else if (transformation.type == Transformation.SCALE_PRESERVE || transformation.type == Transformation.STRETCH) {
transforms.push(['translate', center[0], center[1]]);
transforms.push(['rotate', transformation.angle * RADIAN]);
transforms.push(['scale', transformation.scaleX, transformation.scaleY]);
transforms.push(['rotate', -transformation.angle * RADIAN]);
transforms.push(['translate', -center[0], -center[1]]);
} else if (transformation.type == Transformation.REFLECTION || transformation.type == Transformation.INVERSION) {
transforms.push(['translate', transformation.slideX, transformation.slideY]);
transforms.push(['rotate', transformation.angle * RADIAN]);
transforms.push(['scale', transformation.scaleX, transformation.scaleY]);
transforms.push(['rotate', -transformation.angle * RADIAN]);
transforms.push(['translate', -transformation.slideX, -transformation.slideY]);
}
});
let grouped = [];
transforms.forEach((transform, index) => {
let [type, ...values] = transform;
if (grouped.length && grouped[grouped.length - 1][0] == type)
values.forEach((value, valueIndex) => grouped[grouped.length - 1][valueIndex + 1] += value);
else
grouped.push(transform);
});
let filtered = grouped.filter(transform => {
let [type, ...values] = transform;
if (type == 'scale')
return values.some(value => value != 1);
else
return values.some(value => value != 0);
});
let transAttribute = '';
if (filtered.length) {
transAttribute = ' transform="';
filtered.forEach((transform, index) => {
let [type, ...values] = transform;
transAttribute += `${index == 0 ? '' : ' '}${type}(${values.map(value => Number(value).toFixed(2))})`;
});
transAttribute += '"';
}
return this._drawSvg(transAttribute, bgcolorString);
}
_drawSvg(transAttribute, bgcolorString) {
let row = "\n ";
let points = this.points.map((point) => [Math.round(point[0]*100)/100, Math.round(point[1]*100)/100]);
let color = this.eraser ? bgcolorString : this.color.toJSON();
let fill = this.fill && !this.isStraightLine;
let attributes = this.eraser ? `class="eraser" ` : '';
if (fill) {
attributes += `fill="${color}"`;
if (this.fillRule)
attributes += ` fill-rule="${getFillRuleSvgName(this.fillRule)}"`;
} else {
attributes += `fill="none"`;
}
if (this.line && this.line.lineWidth) {
attributes += ` stroke="${color}"` +
` stroke-width="${this.line.lineWidth}"`;
if (this.line.lineCap)
attributes += ` stroke-linecap="${getLineCapSvgName(this.line.lineCap)}"`;
if (this.line.lineJoin && !this.isStraightLine)
attributes += ` stroke-linejoin="${getLineJoinSvgName(this.line.lineJoin)}"`;
if (this.dash && this.dash.active && this.dash.array && this.dash.array[0] && this.dash.array[1])
attributes += ` stroke-dasharray="${this.dash.array[0]} ${this.dash.array[1]}" stroke-dashoffset="${this.dash.offset}"`;
}
if (this.shape == Shape.LINE && points.length == 4) {
row += `<path ${attributes} d="M${points[0][0]} ${points[0][1]}`;
row += ` C ${points[1][0]} ${points[1][1]}, ${points[2][0]} ${points[2][1]}, ${points[3][0]} ${points[3][1]}`;
row += `${fill ? 'z' : ''}"${transAttribute}/>`;
} else if (this.shape == Shape.LINE && points.length == 3) {
row += `<path ${attributes} d="M${points[0][0]} ${points[0][1]}`;
row += ` C ${points[0][0]} ${points[0][1]}, ${points[1][0]} ${points[1][1]}, ${points[2][0]} ${points[2][1]}`;
row += `${fill ? 'z' : ''}"${transAttribute}/>`;
} else if (this.shape == Shape.LINE) {
row += `<line ${attributes} x1="${points[0][0]}" y1="${points[0][1]}" x2="${points[1][0]}" y2="${points[1][1]}"${transAttribute}/>`;
} else if (this.shape == Shape.NONE) {
row += `<path ${attributes} d="M${points[0][0]} ${points[0][1]}`;
for (let i = 1; i < points.length; i++)
row += ` L ${points[i][0]} ${points[i][1]}`;
row += `${fill ? 'z' : ''}"${transAttribute}/>`;
} else if (this.shape == Shape.ELLIPSE && points.length == 3) {
let ry = Math.hypot(points[1][0] - points[0][0], points[1][1] - points[0][1]);
let rx = Math.hypot(points[2][0] - points[0][0], points[2][1] - points[0][1]);
row += `<ellipse ${attributes} cx="${points[0][0]}" cy="${points[0][1]}" rx="${rx}" ry="${ry}"${transAttribute}/>`;
} else if (this.shape == Shape.ELLIPSE && points.length == 2) {
let r = Math.hypot(points[1][0] - points[0][0], points[1][1] - points[0][1]);
row += `<circle ${attributes} cx="${points[0][0]}" cy="${points[0][1]}" r="${r}"${transAttribute}/>`;
} else if (this.shape == Shape.RECTANGLE && points.length == 2) {
row += `<rect ${attributes} x="${Math.min(points[0][0], points[1][0])}" y="${Math.min(points[0][1], points[1][1])}" ` +
`width="${Math.abs(points[1][0] - points[0][0])}" height="${Math.abs(points[1][1] - points[0][1])}"${transAttribute}/>`;
} else if (this.shape == Shape.POLYGON && points.length >= 3) {
row += `<polygon ${attributes} points="`;
for (let i = 0; i < points.length; i++)
row += ` ${points[i][0]},${points[i][1]}`;
row += `"${transAttribute}/>`;
} else if (this.shape == Shape.POLYLINE && points.length >= 2) {
row += `<polyline ${attributes} points="`;
for (let i = 0; i < points.length; i++)
row += ` ${points[i][0]},${points[i][1]}`;
row += `"${transAttribute}/>`;
}
return row;
}
get lastTransformation() {
if (!this.transformations.length)
return null;
return this.transformations[this.transformations.length - 1];
}
get isStraightLine() {
return this.shape == Shape.LINE && this.points.length == 2;
}
smoothAll() {
let oldPoints = this.points.slice();
for (let i = 0; i < this.points.length; i++)
this._smooth(i);
let newPoints = this.points.slice();
this.transformations.push({ type: Transformation.SMOOTH, undoable: true,
undo: () => this.points = oldPoints,
redo: () => this.points = newPoints });
if (this._undoneTransformations)
this._undoneTransformations = this._undoneTransformations.filter(transformation => transformation.type != Transformation.SMOOTH);
}
addPoint() {
if (this.shape == Shape.POLYGON || this.shape == Shape.POLYLINE) {
// copy last point
let [lastPoint, secondToLastPoint] = [this.points[this.points.length - 1], this.points[this.points.length - 2]];
if (!getNearness(secondToLastPoint, lastPoint, MIN_DRAWING_SIZE))
this.points.push([lastPoint[0], lastPoint[1]]);
} else if (this.shape == Shape.LINE) {
if (this.points.length == 2) {
this.points[2] = this.points[1];
} else if (this.points.length == 3) {
this.points[3] = this.points[2];
this.points[2] = this.points[1];
}
}
}
// For free drawing only.
addIntermediatePoint(x, y, transform) {
let points = this.points;
if (getNearness(points[points.length - 1], [x, y], MIN_INTERMEDIATE_POINT_DISTANCE))
return;
points.push([x, y]);
if (transform)
this._smooth(points.length - 1);
}
startDrawing(startX, startY) {
this.points.push([startX, startY]);
if (this.shape == Shape.POLYGON || this.shape == Shape.POLYLINE)
this.points.push([startX, startY]);
}
updateDrawing(x, y, transform) {
let points = this.points;
if (x == points[points.length - 1][0] && y == points[points.length - 1][1])
return;
transform = transform || this.transformations.length >= 1;
if (this.shape == Shape.NONE) {
points.push([x, y]);
if (transform)
this._smooth(points.length - 1);
} else if ((this.shape == Shape.RECTANGLE || this.shape == Shape.POLYGON || this.shape == Shape.POLYLINE) && transform) {
if (points.length < 2)
return;
let center = this._getOriginalCenter();
this.transformations[0] = { type: Transformation.ROTATION,
angle: getAngle(center[0], center[1], points[points.length - 1][0], points[points.length - 1][1], x, y) };
} else if (this.shape == Shape.ELLIPSE && transform) {
if (points.length < 2)
return;
points[2] = [x, y];
let center = this._getOriginalCenter();
this.transformations[0] = { type: Transformation.ROTATION,
angle: getAngle(center[0], center[1], center[0] + 1, center[1], x, y) };
} else if (this.shape == Shape.POLYGON || this.shape == Shape.POLYLINE) {
points[points.length - 1] = [x, y];
} else {
points[1] = [x, y];
}
}
stopDrawing() {
// skip when the size is too small to be visible (3px) (except for free drawing)
if (this.shape != Shape.NONE && this.points.length >= 2) {
let lastPoint = this.points[this.points.length - 1];
let secondToLastPoint = this.points[this.points.length - 2];
if (getNearness(secondToLastPoint, lastPoint, MIN_DRAWING_SIZE))
this.points.pop();
}
if (this.transformations[0] && this.transformations[0].type == Transformation.ROTATION &&
Math.abs(this.transformations[0].angle) < MIN_ROTATION_ANGLE)
this.transformations.shift();
}
startTransformation(startX, startY, type, undoable) {
if (type == Transformation.TRANSLATION)
this.transformations.push({ startX, startY, type, undoable, slideX: 0, slideY: 0 });
else if (type == Transformation.ROTATION)
this.transformations.push({ startX, startY, type, undoable, angle: 0 });
else if (type == Transformation.SCALE_PRESERVE || type == Transformation.STRETCH)
this.transformations.push({ startX, startY, type, undoable, scaleX: 1, scaleY: 1, angle: 0 });
else if (type == Transformation.REFLECTION)
this.transformations.push({ startX, startY, endX: startX, endY: startY, type, undoable,
scaleX: 1, scaleY: 1, slideX: 0, slideY: 0, angle: 0 });
else if (type == Transformation.INVERSION)
this.transformations.push({ startX, startY, endX: startX, endY: startY, type, undoable,
scaleX: -1, scaleY: -1, slideX: startX, slideY: startY,
angle: Math.PI + Math.atan(startY / (startX || 1)) });
if (type == Transformation.REFLECTION || type == Transformation.INVERSION)
this.showSymmetryElement = true;
else if (type == Transformation.ROTATION)
this.showRotationCenter = true;
else if (type == Transformation.STRETCH)
this.showStretchAxes = true;
}
updateTransformation(x, y) {
let transformation = this.lastTransformation;
if (transformation.type == Transformation.TRANSLATION) {
transformation.slideX = x - transformation.startX;
transformation.slideY = y - transformation.startY;
} else if (transformation.type == Transformation.ROTATION) {
let center = this._getTransformedCenter(transformation);
transformation.angle = getAngle(center[0], center[1], transformation.startX, transformation.startY, x, y);
} else if (transformation.type == Transformation.SCALE_PRESERVE) {
let center = this._getTransformedCenter(transformation);
let scale = Math.hypot(x - center[0], y - center[1]) / Math.hypot(transformation.startX - center[0], transformation.startY - center[1]) || 1;
[transformation.scaleX, transformation.scaleY] = [scale, scale];
} else if (transformation.type == Transformation.STRETCH) {
let center = this._getTransformedCenter(transformation);
let startAngle = getAngle(center[0], center[1], center[0] + 1, center[1], transformation.startX, transformation.startY);
let vertical = Math.abs(Math.sin(startAngle)) >= Math.sin(Math.PI / 2 - STRETCH_TOLERANCE);
let horizontal = Math.abs(Math.cos(startAngle)) >= Math.cos(STRETCH_TOLERANCE);
let scale = Math.hypot(x - center[0], y - center[1]) / Math.hypot(transformation.startX - center[0], transformation.startY - center[1]) || 1;
transformation.scaleX = vertical ? 1 : scale;
transformation.scaleY = !vertical ? 1 : scale;
transformation.angle = vertical || horizontal ? 0 : getAngle(center[0], center[1], center[0] + 1, center[1], x, y);
} else if (transformation.type == Transformation.REFLECTION) {
[transformation.endX, transformation.endY] = [x, y];
if (getNearness([transformation.startX, transformation.startY], [x, y], MIN_REFLECTION_LINE_LENGTH)) {
// do nothing to avoid jumps (no transformation at starting and locked transformation after)
} else if (Math.abs(y - transformation.startY) <= REFLECTION_TOLERANCE && Math.abs(x - transformation.startX) > REFLECTION_TOLERANCE) {
[transformation.scaleX, transformation.scaleY] = [1, -1];
[transformation.slideX, transformation.slideY] = [0, transformation.startY];
transformation.angle = Math.PI;
} else if (Math.abs(x - transformation.startX) <= REFLECTION_TOLERANCE && Math.abs(y - transformation.startY) > REFLECTION_TOLERANCE) {
[transformation.scaleX, transformation.scaleY] = [-1, 1];
[transformation.slideX, transformation.slideY] = [transformation.startX, 0];
transformation.angle = Math.PI;
} else if (x != transformation.startX) {
let tan = (y - transformation.startY) / (x - transformation.startX);
[transformation.scaleX, transformation.scaleY] = [1, -1];
[transformation.slideX, transformation.slideY] = [0, transformation.startY - transformation.startX * tan];
transformation.angle = Math.PI + Math.atan(tan);
} else if (y != transformation.startY) {
let tan = (x - transformation.startX) / (y - transformation.startY);
[transformation.scaleX, transformation.scaleY] = [-1, 1];
[transformation.slideX, transformation.slideY] = [transformation.startX - transformation.startY * tan, 0];
transformation.angle = Math.PI - Math.atan(tan);
}
} else if (transformation.type == Transformation.INVERSION) {
[transformation.endX, transformation.endY] = [x, y];
[transformation.scaleX, transformation.scaleY] = [-1, -1];
[transformation.slideX, transformation.slideY] = [x, y];
transformation.angle = Math.PI + Math.atan(y / (x || 1));
}
}
stopTransformation() {
this.showSymmetryElement = false;
this.showRotationCenter = false;
this.showStretchAxes = false;
// Clean transformations
let transformation = this.lastTransformation;
if (!transformation)
return;
if (transformation.type == Transformation.REFLECTION &&
getNearness([transformation.startX, transformation.startY], [transformation.endX, transformation.endY], MIN_REFLECTION_LINE_LENGTH) ||
transformation.type == Transformation.TRANSLATION && Math.hypot(transformation.slideX, transformation.slideY) < MIN_TRANSLATION_DISTANCE ||
transformation.type == Transformation.ROTATION && Math.abs(transformation.angle) < MIN_ROTATION_ANGLE) {
this.transformations.pop();
} else {
delete transformation.startX;
delete transformation.startY;
delete transformation.endX;
delete transformation.endY;
}
}
undoTransformation() {
if (this.transformations && this.transformations.length) {
// Do not undo initial transformations (transformations made during the drawing step).
if (!this.lastTransformation.undoable)
return false;
if (!this._undoneTransformations)
this._undoneTransformations = [];
let transformation = this.transformations.pop();
if (transformation.type == Transformation.SMOOTH)
transformation.undo();
this._undoneTransformations.push(transformation);
return true;
}
return false;
}
redoTransformation() {
if (this._undoneTransformations && this._undoneTransformations.length) {
if (!this.transformations)
this.transformations = [];
let transformation = this._undoneTransformations.pop();
if (transformation.type == Transformation.SMOOTH)
transformation.redo();
this.transformations.push(transformation);
return true;
}
return false;
}
resetUndoneTransformations() {
delete this._undoneTransformations;
}
get canUndo() {
return this._undoneTransformations && this._undoneTransformations.length ? true : false;
}
// The figure rotation center before transformations (original).
_getOriginalCenter() {
if (!this._originalCenter) {
let points = this.points;
this._originalCenter = this.shape == Shape.ELLIPSE ? [points[0][0], points[0][1]] :
this.shape == Shape.LINE && points.length == 4 ? getCurveCenter(points[0], points[1], points[2], points[3]) :
this.shape == Shape.LINE && points.length == 3 ? getCurveCenter(points[0], points[0], points[1], points[2]) :
points.length >= 3 ? getCentroid(points) :
getNaiveCenter(points);
}
return this._originalCenter;
}
// The figure rotation center, whose position is affected by all transformations done before 'transformation'.
_getTransformedCenter(transformation) {
if (!transformation.elementTransformedCenter) {
let matrix = new Pango.Matrix({ xx: 1, xy: 0, yx: 0, yy: 1, x0: 0, y0: 0 });
// Apply transformations to the matrice in reverse order
// because Pango multiply matrices by the left when applying a transformation
this.transformations.slice(0, this.transformations.indexOf(transformation)).reverse().forEach(transformation => {
if (transformation.type == Transformation.TRANSLATION) {
matrix.translate(transformation.slideX, transformation.slideY);
} else if (transformation.type == Transformation.ROTATION) {
// nothing, the center position is preserved.
} else if (transformation.type == Transformation.SCALE_PRESERVE || transformation.type == Transformation.STRETCH) {
// nothing, the center position is preserved.
} else if (transformation.type == Transformation.REFLECTION || transformation.type == Transformation.INVERSION) {
matrix.translate(transformation.slideX, transformation.slideY);
matrix.rotate(-transformation.angle * RADIAN);
matrix.scale(transformation.scaleX, transformation.scaleY);
matrix.rotate(transformation.angle * RADIAN);
matrix.translate(-transformation.slideX, -transformation.slideY);
}
});
let originalCenter = this._getOriginalCenter();
transformation.elementTransformedCenter = matrix.transform_point(originalCenter[0], originalCenter[1]);
}
return transformation.elementTransformedCenter;
}
_smooth(i) {
if (i < 2)
return;
this.points[i-1] = [(this.points[i-2][0] + this.points[i][0]) / 2, (this.points[i-2][1] + this.points[i][1]) / 2];
}
});
const TextElement = GObject.registerClass({
GTypeName: `${UUID}-TextElement`,
}, class TextElement extends _DrawingElement{
toJSON() {
// The font size is useless because it is always computed from the points during cairo/svg building.
this.font.unset_fields(Pango.FontMask.SIZE);
return {
shape: this.shape,
color: this.color,
eraser: this.eraser,
transformations: this.transformations,
text: this.text,
textAlignment: this.textAlignment,
font: this.font.to_string(),
points: this.points.map((point) => [Math.round(point[0]*100)/100, Math.round(point[1]*100)/100])
};
}
get x() {
// this.textWidth is computed during Cairo building.
let offset = this.textAlignment == TextAlignment.RIGHT ? this.textWidth :
this.textAlignment == TextAlignment.CENTER ? this.textWidth / 2 :
0;
return this.points[1][0] - offset;
}
get y() {
return Math.max(this.points[0][1], this.points[1][1]);
}
get height() {
return Math.abs(this.points[1][1] - this.points[0][1]);
}
// this.lineWidths is computed during Cairo building.
_getLineX(index) {
let offset = this.textAlignment == TextAlignment.RIGHT && this.lineWidths && this.lineWidths[index] ? this.lineWidths[index] :
this.textAlignment == TextAlignment.CENTER && this.lineWidths && this.lineWidths[index] ? this.lineWidths[index] / 2 :
0;
return this.points[1][0] - offset;
}
_drawCairo(cr, params) {
if (this.points.length != 2)
return;
let layout = PangoCairo.create_layout(cr);
let fontSize = this.height * Pango.SCALE;
this.font.set_absolute_size(fontSize);
layout.set_font_description(this.font);
layout.set_text(this.text, -1);
this.textWidth = layout.get_pixel_size()[0];
this.lineWidths = layout.get_lines_readonly().map(layoutLine => layoutLine.get_pixel_extents()[1].width);
layout.get_lines_readonly().forEach((layoutLine, index) => {
cr.moveTo(this._getLineX(index), this.y + this.height * index);
PangoCairo.show_layout_line(cr, layoutLine);
});
// Cannot use 'layout.index_to_line_x(cursorPosition, 0)' because character position != byte index
if (params.showTextCursor) {
let layoutCopy = layout.copy();
if (this.cursorPosition != -1)
layoutCopy.set_text(this.text.slice(0, this.cursorPosition), -1);
let cursorLineIndex = layoutCopy.get_line_count() - 1;
let cursorX = this._getLineX(cursorLineIndex) + layoutCopy.get_line_readonly(cursorLineIndex).get_pixel_extents()[1].width;
let cursorY = this.y + this.height * cursorLineIndex;
cr.rectangle(cursorX, cursorY, this.height / 25, - this.height);
cr.fill();
}
if (params.showElementBounds) {
cr.rectangle(this.x, this.y - this.height,
this.textWidth, this.height * layout.get_line_count());
setDummyStroke(cr);
} else if (params.drawElementBounds) {
cr.rectangle(this.x, this.y - this.height,
this.textWidth, this.height * layout.get_line_count());
// Only draw the rectangle to find the element, not to show it.
cr.setLineWidth(0);
}
}
getContainsPoint(cr, x, y) {
return cr.inFill(x, y);
}
_drawSvg(transAttribute, bgcolorString) {
if (this.points.length != 2)
return "";
let row = "";
let height = Math.round(this.height * 100) / 100;
let color = this.eraser ? bgcolorString : this.color.toJSON();
let attributes = this.eraser ? `class="eraser" ` : '';
attributes += `fill="${color}" ` +
`font-size="${height}" ` +
`font-family="${this.font.get_family()}"`;
// this.font.to_string() is not valid to fill the svg 'font' shorthand property.
// Each property must be filled separately.
['Stretch', 'Style', 'Variant'].forEach(attribute => {
let lower = attribute.toLowerCase();
if (this.font[`get_${lower}`]() != Pango[attribute].NORMAL) {
let font = new Pango.FontDescription();
font[`set_${lower}`](this.font[`get_${lower}`]());
attributes += ` font-${lower}="${font.to_string()}"`;
}
});
if (this.font.get_weight() != Pango.Weight.NORMAL)
attributes += ` font-weight="${this.font.get_weight()}"`;
// It is a fallback for thumbnails. The following layout is not the same than the Cairo one and
// layoutLine.get_pixel_extents does not return the correct value with non-latin fonts.
// An alternative would be to store this.lineWidths in the json.
if (this.textAlignment != TextAlignment.LEFT && !this.lineWidths) {
let clutterText = new Clutter.Text({ text: this.text });
let layout = clutterText.get_layout();
let fontSize = height * Pango.SCALE;
this.font.set_absolute_size(fontSize);
layout.set_font_description(this.font);
this.lineWidths = layout.get_lines_readonly().map(layoutLine => layoutLine.get_pixel_extents()[1].width);
}
this.text.split(/\r\n|\r|\n/).forEach((text, index) => {
let x = Math.round(this._getLineX(index) * 100) / 100;
let y = Math.round((this.y + this.height * index) * 100) / 100;
row += `\n <text ${attributes} x="${x}" y="${y}"${transAttribute}>${text}</text>`;
});
return row;
}
updateDrawing(x, y, transform) {
let points = this.points;
if (x == points[points.length - 1][0] && y == points[points.length - 1][1])
return;
transform = transform || this.transformations.length >= 1;
if (transform) {
if (points.length < 2)
return;
let [slideX, slideY] = [x - points[1][0], y - points[1][1]];
points[0] = [points[0][0] + slideX, points[0][1] + slideY];
points[1] = [x, y];
} else {
points[1] = [x, y];
}
}
_getOriginalCenter() {
if (!this._originalCenter) {
let points = this.points;
this._originalCenter = points.length == 2 ? [points[1][0], Math.max(points[0][1], points[1][1])] :
points.length >= 3 ? getCentroid(points) :
getNaiveCenter(points);
}
return this._originalCenter;
}
});
const ImageElement = GObject.registerClass({
GTypeName: `${UUID}-ImageElement`,
}, class ImageElement extends _DrawingElement{
toJSON() {
return {
shape: this.shape,
color: this.color,
colored: this.colored,
transformations: this.transformations,
image: this.image,
preserveAspectRatio: this.preserveAspectRatio,
points: this.points.map((point) => [Math.round(point[0]*100)/100, Math.round(point[1]*100)/100])
};
}
_drawCairo(cr, params) {
if (this.points.length < 2)
return;
let points = this.points;
let [x, y] = [Math.min(points[0][0], points[1][0]), Math.min(points[0][1], points[1][1])];
let [width, height] = [Math.abs(points[1][0] - points[0][0]), Math.abs(points[1][1] - points[0][1])];
if (width < 1 || height < 1)
return;
cr.save();
this.image.setCairoSource(cr, x, y, width, height, this.preserveAspectRatio, this.colored ? this.color.toJSON() : null);
cr.rectangle(x, y, width, height);
cr.fill();
cr.restore();
if (params.showElementBounds) {
cr.rectangle(x, y, width, height);
setDummyStroke(cr);
} else if (params.drawElementBounds) {
cr.rectangle(x, y, width, height);
// Only draw the rectangle to find the element, not to show it.
cr.setLineWidth(0);
}
}
getContainsPoint(cr, x, y) {
return cr.inFill(x, y);
}
_drawSvg(transAttribute) {
let points = this.points;
let row = "\n ";
let attributes = '';
if (points.length == 2) {
attributes += `fill="none"`;
let base64 = this.image.getBase64ForColor(this.colored ? this.color.toJSON() : null);
row += `<image ${attributes} x="${Math.min(points[0][0], points[1][0])}" y="${Math.min(points[0][1], points[1][1])}" ` +
`width="${Math.abs(points[1][0] - points[0][0])}" height="${Math.abs(points[1][1] - points[0][1])}"${transAttribute} ` +
`preserveAspectRatio="${this.preserveAspectRatio ? 'xMinYMin' : 'none'}" ` +
`id="${this.image.displayName}" xlink:href="data:${this.image.contentType};base64,${base64}"/>`;
}
return row;
}
updateDrawing(x, y, transform) {
let points = this.points;
if (x == points[0][0] || y == points[0][1])
return;
points[1] = [x, y];
this.preserveAspectRatio = !transform;
}
});
const setDummyStroke = function(cr) {
cr.setLineWidth(2);
cr.setLineCap(0);
cr.setLineJoin(0);
cr.setDash([1, 2], 0);
};
const getNearness = function(pointA, pointB, distance) {
return Math.hypot(pointB[0] - pointA[0], pointB[1] - pointA[1]) < distance;
};