draw-to-elements 4
Merge branch 'elements' into draw-to-elements
This commit is contained in:
abakkk
commit
78be404571
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@ -0,0 +1,754 @@
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/* jslint esversion: 6 */
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/*
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* Copyright 2019 Abakkk
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*
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* This file is part of DrawOnYourScreen, a drawing extension for GNOME Shell.
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* https://framagit.org/abakkk/DrawOnYourScreen
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
|
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* the Free Software Foundation, either version 2 of the License, or
|
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
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* GNU General Public License for more details.
|
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*
|
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* You should have received a copy of the GNU General Public License
|
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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const Cairo = imports.cairo;
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const Clutter = imports.gi.Clutter;
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const Lang = imports.lang;
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const Pango = imports.gi.Pango;
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const PangoCairo = imports.gi.PangoCairo;
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const ExtensionUtils = imports.misc.extensionUtils;
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const Me = ExtensionUtils.getCurrentExtension();
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const _ = imports.gettext.domain(Me.metadata['gettext-domain']).gettext;
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const SVG_DEBUG_SUPERPOSES_CAIRO = false;
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const reverseEnumeration = function(obj) {
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let reversed = {};
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Object.keys(obj).forEach(key => {
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reversed[obj[key]] = key.slice(0,1) + key.slice(1).toLowerCase().replace('_', '-');
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});
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return reversed;
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};
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const Shapes = { NONE: 0, LINE: 1, ELLIPSE: 2, RECTANGLE: 3, TEXT: 4, POLYGON: 5, POLYLINE: 6 };
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const Manipulations = { MOVE: 100, RESIZE: 101, MIRROR: 102 };
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const Transformations = { TRANSLATION: 0, ROTATION: 1, SCALE_PRESERVE: 2, STRETCH: 3, REFLECTION: 4, INVERSION: 5 };
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var Tools = Object.assign({}, Shapes, Manipulations);
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var ToolNames = { 0: "Free drawing", 1: "Line", 2: "Ellipse", 3: "Rectangle", 4: "Text", 5: "Polygon", 6: "Polyline", 100: "Move", 101: "Resize", 102: "Mirror" };
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var LineCapNames = Object.assign(reverseEnumeration(Cairo.LineCap), { 2: 'Square' });
|
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var LineJoinNames = reverseEnumeration(Cairo.LineJoin);
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var FillRuleNames = { 0: 'Nonzero', 1: 'Evenodd' };
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var FontGenericNames = { 0: 'Theme', 1: 'Sans-Serif', 2: 'Serif', 3: 'Monospace', 4: 'Cursive', 5: 'Fantasy' };
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var FontWeightNames = Object.assign(reverseEnumeration(Pango.Weight), { 200: "Ultra-light", 350: "Semi-light", 600: "Semi-bold", 800: "Ultra-bold" });
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delete FontWeightNames[Pango.Weight.ULTRAHEAVY];
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var FontStyleNames = reverseEnumeration(Pango.Style);
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var FontStretchNames = reverseEnumeration(Pango.Stretch);
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var FontVariantNames = reverseEnumeration(Pango.Variant);
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|
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const RADIAN = 180 / Math.PI; // degree
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const INVERSION_CIRCLE_RADIUS = 12; // px
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const REFLECTION_TOLERANCE = 5; // px, to select vertical and horizontal directions
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const STRETCH_TOLERANCE = Math.PI / 8; // rad, to select vertical and horizontal directions
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const MIN_REFLECTION_LINE_LENGTH = 10; // px
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const MIN_TRANSLATION_DISTANCE = 1; // px
|
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const MIN_ROTATION_ANGLE = Math.PI / 1000; // rad
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const MIN_DRAWING_SIZE = 3; // px
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|
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// DrawingElement represents a "brushstroke".
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// It can be converted into a cairo path as well as a svg element.
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// See DrawingArea._startDrawing() to know its params.
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const DrawingElement = new Lang.Class({
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Name: 'DrawOnYourScreenDrawingElement',
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|
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_init: function(params) {
|
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for (let key in params)
|
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this[key] = params[key];
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|
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// compatibility with json generated by old extension versions
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|
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if (params.fillRule === undefined)
|
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this.fillRule = Cairo.FillRule.WINDING;
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if (params.transformations === undefined)
|
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this.transformations = [];
|
||||
if (params.shape == Shapes.TEXT) {
|
||||
if (params.font && params.font.weight === 0)
|
||||
this.font.weight = 400;
|
||||
if (params.font && params.font.weight === 1)
|
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this.font.weight = 700;
|
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}
|
||||
|
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if (params.transform && params.transform.center) {
|
||||
let angle = (params.transform.angle || 0) + (params.transform.startAngle || 0);
|
||||
if (angle)
|
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this.transformations.push({ type: Transformations.ROTATION, angle: angle });
|
||||
}
|
||||
if (params.shape == Shapes.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]];
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// 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]]);
|
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}
|
||||
delete this.transform;
|
||||
},
|
||||
|
||||
// toJSON is called by JSON.stringify
|
||||
toJSON: function() {
|
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return {
|
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shape: this.shape,
|
||||
color: this.color,
|
||||
line: this.line,
|
||||
dash: this.dash,
|
||||
fill: this.fill,
|
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fillRule: this.fillRule,
|
||||
eraser: this.eraser,
|
||||
transformations: this.transformations,
|
||||
text: this.text,
|
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lineIndex: this.lineIndex !== undefined ? this.lineIndex : undefined,
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textRightAligned: this.textRightAligned,
|
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font: this.font,
|
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points: this.points.map((point) => [Math.round(point[0]*100)/100, Math.round(point[1]*100)/100])
|
||||
};
|
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},
|
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|
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buildCairo: function(cr, params) {
|
||||
let [success, color] = Clutter.Color.from_string(this.color);
|
||||
if (success)
|
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Clutter.cairo_set_source_color(cr, color);
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|
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if (this.showSymmetryElement) {
|
||||
let transformation = this.lastTransformation;
|
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setDummyStroke(cr);
|
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if (transformation.type == Transformations.REFLECTION) {
|
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cr.moveTo(transformation.startX, transformation.startY);
|
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cr.lineTo(transformation.endX, transformation.endY);
|
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} else {
|
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cr.arc(transformation.endX, transformation.endY, INVERSION_CIRCLE_RADIUS, 0, 2 * Math.PI);
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}
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cr.stroke();
|
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}
|
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|
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cr.setLineCap(this.line.lineCap);
|
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cr.setLineJoin(this.line.lineJoin);
|
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cr.setLineWidth(this.line.lineWidth);
|
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if (this.fillRule)
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cr.setFillRule(this.fillRule);
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|
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if (this.dash && this.dash.active && this.dash.array && this.dash.array[0] && this.dash.array[1])
|
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cr.setDash(this.dash.array, this.dash.offset);
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|
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if (this.eraser)
|
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cr.setOperator(Cairo.Operator.CLEAR);
|
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else
|
||||
cr.setOperator(Cairo.Operator.OVER);
|
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|
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if (params.dummyStroke)
|
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setDummyStroke(cr);
|
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|
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if (SVG_DEBUG_SUPERPOSES_CAIRO) {
|
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Clutter.cairo_set_source_color(cr, Clutter.Color.new(255, 0, 0, 255));
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cr.setLineWidth(this.line.lineWidth / 2 || 1);
|
||||
}
|
||||
|
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this.transformations.slice(0).reverse().forEach(transformation => {
|
||||
if (transformation.type == Transformations.TRANSLATION) {
|
||||
cr.translate(transformation.slideX, transformation.slideY);
|
||||
} else if (transformation.type == Transformations.ROTATION) {
|
||||
let center = this._getTransformedCenter(transformation);
|
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cr.translate(center[0], center[1]);
|
||||
cr.rotate(transformation.angle);
|
||||
cr.translate(-center[0], -center[1]);
|
||||
} else if (transformation.type == Transformations.SCALE_PRESERVE || transformation.type == Transformations.STRETCH) {
|
||||
let center = this._getTransformedCenter(transformation);
|
||||
cr.translate(center[0], center[1]);
|
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cr.rotate(transformation.angle);
|
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cr.scale(transformation.scaleX, transformation.scaleY);
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cr.rotate(-transformation.angle);
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cr.translate(-center[0], -center[1]);
|
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} else if (transformation.type == Transformations.REFLECTION || transformation.type == Transformations.INVERSION) {
|
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cr.translate(transformation.slideX, transformation.slideY);
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cr.rotate(transformation.angle);
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cr.scale(transformation.scaleX, transformation.scaleY);
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cr.rotate(-transformation.angle);
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cr.translate(-transformation.slideX, -transformation.slideY);
|
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}
|
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});
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|
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let [points, shape] = [this.points, this.shape];
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|
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if (shape == Shapes.LINE && points.length == 3) {
|
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cr.moveTo(points[0][0], points[0][1]);
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cr.curveTo(points[0][0], points[0][1], points[1][0], points[1][1], points[2][0], points[2][1]);
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} else if (shape == Shapes.LINE && points.length == 4) {
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cr.moveTo(points[0][0], points[0][1]);
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cr.curveTo(points[1][0], points[1][1], points[2][0], points[2][1], points[3][0], points[3][1]);
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} else if (shape == Shapes.NONE || shape == Shapes.LINE) {
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cr.moveTo(points[0][0], points[0][1]);
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for (let j = 1; j < points.length; j++) {
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cr.lineTo(points[j][0], points[j][1]);
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}
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} else if (shape == Shapes.ELLIPSE && points.length >= 2) {
|
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let radius = Math.hypot(points[1][0] - points[0][0], points[1][1] - points[0][1]);
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let ratio = 1;
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if (points[2]) {
|
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ratio = Math.hypot(points[2][0] - points[0][0], points[2][1] - points[0][1]) / radius;
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cr.translate(points[0][0], points[0][1]);
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cr.scale(ratio, 1);
|
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cr.translate(-points[0][0], -points[0][1]);
|
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cr.arc(points[0][0], points[0][1], radius, 0, 2 * Math.PI);
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cr.translate(points[0][0], points[0][1]);
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cr.scale(1 / ratio, 1);
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cr.translate(-points[0][0], -points[0][1]);
|
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} else
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cr.arc(points[0][0], points[0][1], radius, 0, 2 * Math.PI);
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} else if (shape == Shapes.RECTANGLE && points.length == 2) {
|
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cr.rectangle(points[0][0], points[0][1], points[1][0] - points[0][0], points[1][1] - points[0][1]);
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} else if ((shape == Shapes.POLYGON || shape == Shapes.POLYLINE) && points.length >= 2) {
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cr.moveTo(points[0][0], points[0][1]);
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for (let j = 1; j < points.length; j++) {
|
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cr.lineTo(points[j][0], points[j][1]);
|
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}
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if (shape == Shapes.POLYGON)
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cr.closePath();
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|
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} else if (shape == Shapes.TEXT && points.length == 2) {
|
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let layout = PangoCairo.create_layout(cr);
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let fontSize = Math.abs(points[1][1] - points[0][1]) * Pango.SCALE;
|
||||
let fontDescription = new Pango.FontDescription();
|
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fontDescription.set_absolute_size(fontSize);
|
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['family', 'weight', 'style', 'stretch', 'variant'].forEach(attribute => {
|
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if (this.font[attribute] !== undefined)
|
||||
try {
|
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fontDescription[`set_${attribute}`](this.font[attribute]);
|
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} catch(e) {}
|
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});
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layout.set_font_description(fontDescription);
|
||||
layout.set_text(this.text, -1);
|
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this.textWidth = layout.get_pixel_size()[0];
|
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cr.moveTo(points[1][0] - (this.textRightAligned ? this.textWidth : 0), Math.max(points[0][1],points[1][1]) - layout.get_baseline() / Pango.SCALE);
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layout.set_text(this.text, -1);
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PangoCairo.show_layout(cr, layout);
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|
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if (params.showTextCursor) {
|
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let cursorPosition = this.cursorPosition == -1 ? this.text.length : this.cursorPosition;
|
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layout.set_text(this.text.slice(0, cursorPosition), -1);
|
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let width = layout.get_pixel_size()[0];
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cr.rectangle(points[1][0] - (this.textRightAligned ? this.textWidth : 0) + width, Math.max(points[0][1],points[1][1]),
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Math.abs(points[1][1] - points[0][1]) / 25, - Math.abs(points[1][1] - points[0][1]));
|
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cr.fill();
|
||||
}
|
||||
|
||||
if (params.showTextRectangle || params.drawTextRectangle) {
|
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cr.rectangle(points[1][0] - (this.textRightAligned ? this.textWidth : 0), Math.max(points[0][1], points[1][1]),
|
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this.textWidth, - Math.abs(points[1][1] - points[0][1]));
|
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if (params.showTextRectangle)
|
||||
setDummyStroke(cr);
|
||||
else
|
||||
// Only draw the rectangle to find the element, not to show it.
|
||||
cr.setLineWidth(0);
|
||||
}
|
||||
}
|
||||
|
||||
cr.identityMatrix();
|
||||
},
|
||||
|
||||
getContainsPoint: function(cr, x, y) {
|
||||
if (this.shape == Shapes.TEXT)
|
||||
return cr.inFill(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: function(bgColor) {
|
||||
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 ? bgColor : this.color;
|
||||
let fill = this.fill && !this.isStraightLine;
|
||||
let attributes = '';
|
||||
|
||||
if (fill) {
|
||||
attributes = `fill="${color}"`;
|
||||
if (this.fillRule)
|
||||
attributes += ` fill-rule="${FillRuleNames[this.fillRule].toLowerCase()}"`;
|
||||
} else {
|
||||
attributes = `fill="none"`;
|
||||
}
|
||||
|
||||
if (this.line && this.line.lineWidth) {
|
||||
attributes += ` stroke="${color}"` +
|
||||
` stroke-width="${this.line.lineWidth}"`;
|
||||
if (this.line.lineCap)
|
||||
attributes += ` stroke-linecap="${LineCapNames[this.line.lineCap].toLowerCase()}"`;
|
||||
if (this.line.lineJoin && !this.isStraightLine)
|
||||
attributes += ` stroke-linejoin="${LineJoinNames[this.line.lineJoin].toLowerCase()}"`;
|
||||
if (this.dash && this.dash.active && this.dash.array && this.dash.array[0] && this.dash.array[1])
|
||||
attributes += ` stroke-dasharray="${this.dash.array[0]} ${this.dash.array[1]}" stroke-dashoffset="${this.dash.offset}"`;
|
||||
} else {
|
||||
attributes += ` stroke="none"`;
|
||||
}
|
||||
|
||||
let transAttribute = '';
|
||||
this.transformations.slice(0).reverse().forEach(transformation => {
|
||||
transAttribute += transAttribute ? ' ' : ' transform="';
|
||||
let center = this._getTransformedCenter(transformation);
|
||||
|
||||
if (transformation.type == Transformations.TRANSLATION) {
|
||||
transAttribute += `translate(${transformation.slideX},${transformation.slideY})`;
|
||||
} else if (transformation.type == Transformations.ROTATION) {
|
||||
transAttribute += `translate(${center[0]},${center[1]}) `;
|
||||
transAttribute += `rotate(${transformation.angle * RADIAN}) `;
|
||||
transAttribute += `translate(${-center[0]},${-center[1]})`;
|
||||
} else if (transformation.type == Transformations.SCALE_PRESERVE || transformation.type == Transformations.STRETCH) {
|
||||
transAttribute += `translate(${center[0]},${center[1]}) `;
|
||||
transAttribute += `rotate(${transformation.angle * RADIAN}) `;
|
||||
transAttribute += `scale(${transformation.scaleX},${transformation.scaleY}) `;
|
||||
transAttribute += `rotate(${-transformation.angle * RADIAN}) `;
|
||||
transAttribute += `translate(${-center[0]},${-center[1]})`;
|
||||
} else if (transformation.type == Transformations.REFLECTION || transformation.type == Transformations.INVERSION) {
|
||||
transAttribute += `translate(${transformation.slideX}, ${transformation.slideY}) `;
|
||||
transAttribute += `rotate(${transformation.angle * RADIAN}) `;
|
||||
transAttribute += `scale(${transformation.scaleX}, ${transformation.scaleY}) `;
|
||||
transAttribute += `rotate(${-transformation.angle * RADIAN}) `;
|
||||
transAttribute += `translate(${-transformation.slideX}, ${-transformation.slideY})`;
|
||||
}
|
||||
});
|
||||
transAttribute += transAttribute ? '"' : '';
|
||||
|
||||
if (this.shape == Shapes.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 == Shapes.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 == Shapes.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 == Shapes.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 == Shapes.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 == Shapes.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 == Shapes.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 == Shapes.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 == Shapes.POLYLINE && points.length >= 2) {
|
||||
row += `<polyline ${attributes} points="`;
|
||||
for (let i = 0; i < points.length; i++)
|
||||
row += ` ${points[i][0]},${points[i][1]}`;
|
||||
row += `"${transAttribute}/>`;
|
||||
|
||||
} else if (this.shape == Shapes.TEXT && points.length == 2) {
|
||||
attributes = `fill="${color}" ` +
|
||||
`stroke="transparent" ` +
|
||||
`stroke-opacity="0" ` +
|
||||
`font-size="${Math.abs(points[1][1] - points[0][1])}"`;
|
||||
|
||||
if (this.font.family)
|
||||
attributes += ` font-family="${this.font.family}"`;
|
||||
if (this.font.weight && this.font.weight != Pango.Weight.NORMAL)
|
||||
attributes += ` font-weight="${this.font.weight}"`;
|
||||
if (this.font.style && FontStyleNames[this.font.style])
|
||||
attributes += ` font-style="${FontStyleNames[this.font.style].toLowerCase()}"`;
|
||||
if (FontStretchNames[this.font.stretch] && this.font.stretch != Pango.Stretch.NORMAL)
|
||||
attributes += ` font-stretch="${FontStretchNames[this.font.stretch].toLowerCase()}"`;
|
||||
if (this.font.variant && FontVariantNames[this.font.variant])
|
||||
attributes += ` font-variant="${FontVariantNames[this.font.variant].toLowerCase()}"`;
|
||||
|
||||
// this.textWidth is computed during Cairo building.
|
||||
row += `<text ${attributes} x="${points[1][0] - (this.textRightAligned ? this.textWidth : 0)}" `;
|
||||
row += `y="${Math.max(points[0][1], points[1][1])}"${transAttribute}>${this.text}</text>`;
|
||||
}
|
||||
|
||||
return row;
|
||||
},
|
||||
|
||||
get lastTransformation() {
|
||||
if (!this.transformations.length)
|
||||
return null;
|
||||
|
||||
return this.transformations[this.transformations.length - 1];
|
||||
},
|
||||
|
||||
get isStraightLine() {
|
||||
return this.shape == Shapes.LINE && this.points.length == 2;
|
||||
},
|
||||
|
||||
smoothAll: function() {
|
||||
for (let i = 0; i < this.points.length; i++) {
|
||||
this._smooth(i);
|
||||
}
|
||||
},
|
||||
|
||||
addPoint: function() {
|
||||
if (this.shape == Shapes.POLYGON || this.shape == Shapes.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 == Shapes.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];
|
||||
}
|
||||
}
|
||||
},
|
||||
|
||||
startDrawing: function(startX, startY) {
|
||||
this.points.push([startX, startY]);
|
||||
|
||||
if (this.shape == Shapes.POLYGON || this.shape == Shapes.POLYLINE)
|
||||
this.points.push([startX, startY]);
|
||||
},
|
||||
|
||||
updateDrawing: function(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 == Shapes.NONE) {
|
||||
points.push([x, y]);
|
||||
if (transform)
|
||||
this._smooth(points.length - 1);
|
||||
|
||||
} else if ((this.shape == Shapes.RECTANGLE || this.shape == Shapes.POLYGON || this.shape == Shapes.POLYLINE) && transform) {
|
||||
if (points.length < 2)
|
||||
return;
|
||||
|
||||
let center = this._getOriginalCenter();
|
||||
this.transformations[0] = { type: Transformations.ROTATION,
|
||||
angle: getAngle(center[0], center[1], points[points.length - 1][0], points[points.length - 1][1], x, y) };
|
||||
|
||||
} else if (this.shape == Shapes.ELLIPSE && transform) {
|
||||
if (points.length < 2)
|
||||
return;
|
||||
|
||||
points[2] = [x, y];
|
||||
let center = this._getOriginalCenter();
|
||||
this.transformations[0] = { type: Transformations.ROTATION,
|
||||
angle: getAngle(center[0], center[1], center[0] + 1, center[1], x, y) };
|
||||
|
||||
} else if (this.shape == Shapes.POLYGON || this.shape == Shapes.POLYLINE) {
|
||||
points[points.length - 1] = [x, y];
|
||||
|
||||
} else if (this.shape == Shapes.TEXT && 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];
|
||||
|
||||
}
|
||||
},
|
||||
|
||||
stopDrawing: function() {
|
||||
// skip when the size is too small to be visible (3px) (except for free drawing)
|
||||
if (this.shape != Shapes.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 == Transformations.ROTATION &&
|
||||
Math.abs(this.transformations[0].angle) < MIN_ROTATION_ANGLE)
|
||||
this.transformations.shift();
|
||||
},
|
||||
|
||||
startTransformation: function(startX, startY, type) {
|
||||
if (type == Transformations.TRANSLATION)
|
||||
this.transformations.push({ startX: startX, startY: startY, type: type, slideX: 0, slideY: 0 });
|
||||
else if (type == Transformations.ROTATION)
|
||||
this.transformations.push({ startX: startX, startY: startY, type: type, angle: 0 });
|
||||
else if (type == Transformations.SCALE_PRESERVE || type == Transformations.STRETCH)
|
||||
this.transformations.push({ startX: startX, startY: startY, type: type, scaleX: 1, scaleY: 1, angle: 0 });
|
||||
else if (type == Transformations.REFLECTION)
|
||||
this.transformations.push({ startX: startX, startY: startY, endX: startX, endY: startY, type: type,
|
||||
scaleX: 1, scaleY: 1, slideX: 0, slideY: 0, angle: 0 });
|
||||
else if (type == Transformations.INVERSION)
|
||||
this.transformations.push({ startX: startX, startY: startY, endX: startX, endY: startY, type: type,
|
||||
scaleX: -1, scaleY: -1, slideX: startX, slideY: startY,
|
||||
angle: Math.PI + Math.atan(startY / (startX || 1)) });
|
||||
|
||||
if (type == Transformations.REFLECTION || type == Transformations.INVERSION)
|
||||
this.showSymmetryElement = true;
|
||||
},
|
||||
|
||||
updateTransformation: function(x, y) {
|
||||
let transformation = this.lastTransformation;
|
||||
|
||||
if (transformation.type == Transformations.TRANSLATION) {
|
||||
transformation.slideX = x - transformation.startX;
|
||||
transformation.slideY = y - transformation.startY;
|
||||
} else if (transformation.type == Transformations.ROTATION) {
|
||||
let center = this._getTransformedCenter(transformation);
|
||||
transformation.angle = getAngle(center[0], center[1], transformation.startX, transformation.startY, x, y);
|
||||
} else if (transformation.type == Transformations.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 == Transformations.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 == Transformations.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 == Transformations.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: function() {
|
||||
// Clean transformations
|
||||
let transformation = this.lastTransformation;
|
||||
|
||||
if (transformation.type == Transformations.REFLECTION || transformation.type == Transformations.INVERSION)
|
||||
this.showSymmetryElement = false;
|
||||
|
||||
if (transformation.type == Transformations.REFLECTION &&
|
||||
getNearness([transformation.startX, transformation.startY], [transformation.endX, transformation.endY], MIN_REFLECTION_LINE_LENGTH) ||
|
||||
transformation.type == Transformations.TRANSLATION && Math.hypot(transformation.slideX, transformation.slideY) < MIN_TRANSLATION_DISTANCE ||
|
||||
transformation.type == Transformations.ROTATION && Math.abs(transformation.angle) < MIN_ROTATION_ANGLE) {
|
||||
|
||||
this.transformations.pop();
|
||||
} else {
|
||||
delete transformation.startX;
|
||||
delete transformation.startY;
|
||||
delete transformation.endX;
|
||||
delete transformation.endY;
|
||||
}
|
||||
},
|
||||
|
||||
// When rotating grouped lines, lineOffset is used to retrieve the rotation center of the first line.
|
||||
_getLineOffset: function() {
|
||||
return (this.lineIndex || 0) * Math.abs(this.points[1][1] - this.points[0][1]);
|
||||
},
|
||||
|
||||
// The figure rotation center before transformations (original).
|
||||
// this.textWidth is computed during Cairo building.
|
||||
_getOriginalCenter: function() {
|
||||
if (!this._originalCenter) {
|
||||
let points = this.points;
|
||||
this._originalCenter = this.shape == Shapes.ELLIPSE ? [points[0][0], points[0][1]] :
|
||||
this.shape == Shapes.LINE && points.length == 4 ? getCurveCenter(points[0], points[1], points[2], points[3]) :
|
||||
this.shape == Shapes.LINE && points.length == 3 ? getCurveCenter(points[0], points[0], points[1], points[2]) :
|
||||
this.shape == Shapes.TEXT && this.textWidth ? [points[1][0], Math.max(points[0][1], points[1][1]) - this._getLineOffset()] :
|
||||
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: function(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 == Transformations.TRANSLATION) {
|
||||
matrix.translate(transformation.slideX, transformation.slideY);
|
||||
} else if (transformation.type == Transformations.ROTATION) {
|
||||
// nothing, the center position is preserved.
|
||||
} else if (transformation.type == Transformations.SCALE_PRESERVE || transformation.type == Transformations.STRETCH) {
|
||||
// nothing, the center position is preserved.
|
||||
} else if (transformation.type == Transformations.REFLECTION || transformation.type == Transformations.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: function(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 setDummyStroke = function(cr) {
|
||||
cr.setLineWidth(2);
|
||||
cr.setLineCap(0);
|
||||
cr.setLineJoin(0);
|
||||
cr.setDash([1, 2], 0);
|
||||
};
|
||||
|
||||
/*
|
||||
Some geometric utils
|
||||
*/
|
||||
|
||||
const getNearness = function(pointA, pointB, distance) {
|
||||
return Math.hypot(pointB[0] - pointA[0], pointB[1] - pointA[1]) < distance;
|
||||
};
|
||||
|
||||
// mean of the vertices, ok for regular polygons
|
||||
const getNaiveCenter = function(points) {
|
||||
return points.reduce((accumulator, point) => accumulator = [accumulator[0] + point[0], accumulator[1] + point[1]])
|
||||
.map(coord => coord / points.length);
|
||||
};
|
||||
|
||||
// https://en.wikipedia.org/wiki/Centroid#Of_a_polygon
|
||||
const getCentroid = function(points) {
|
||||
let n = points.length;
|
||||
points.push(points[0]);
|
||||
|
||||
let [sA, sX, sY] = [0, 0, 0];
|
||||
for (let i = 0; i <= n-1; i++) {
|
||||
let a = points[i][0]*points[i+1][1] - points[i+1][0]*points[i][1];
|
||||
sA += a;
|
||||
sX += (points[i][0] + points[i+1][0]) * a;
|
||||
sY += (points[i][1] + points[i+1][1]) * a;
|
||||
}
|
||||
|
||||
points.pop();
|
||||
if (sA == 0)
|
||||
return getNaiveCenter(points);
|
||||
return [sX / (3 * sA), sY / (3 * sA)];
|
||||
};
|
||||
|
||||
/*
|
||||
Cubic Bézier:
|
||||
[0, 1] -> ℝ², P(t) = (1-t)³P₀ + 3t(1-t)²P₁ + 3t²(1-t)P₂ + t³P₃
|
||||
|
||||
general case:
|
||||
|
||||
const cubicBezierCoord = function(x0, x1, x2, x3, t) {
|
||||
return (1-t)**3*x0 + 3*t*(1-t)**2*x1 + 3*t**2*(1-t)*x2 + t**3*x3;
|
||||
}
|
||||
|
||||
const cubicBezierPoint = function(p0, p1, p2, p3, t) {
|
||||
return [cubicBezier(p0[0], p1[0], p2[0], p3[0], t), cubicBezier(p0[1], p1[1], p2[1], p3[1], t)];
|
||||
}
|
||||
|
||||
Approximatively:
|
||||
control point: p0 ---- p1 ---- p2 ---- p3 (p2 is not on the curve)
|
||||
t: 0 ---- 1/3 ---- 2/3 ---- 1
|
||||
*/
|
||||
|
||||
// If the curve has a symmetry axis, it is truly a center (the intersection of the curve and the axis).
|
||||
// In other cases, it is not a notable point, just a visual approximation.
|
||||
const getCurveCenter = function(p0, p1, p2, p3) {
|
||||
if (p0[0] == p1[0] && p0[1] == p1[1])
|
||||
// p0 = p1, t = 2/3
|
||||
return [(p1[0] + 6*p1[0] + 12*p2[0] + 8*p3[0]) / 27, (p1[1] + 6*p1[1] + 12*p2[1] + 8*p3[1]) / 27];
|
||||
else
|
||||
// t = 1/2
|
||||
return [(p0[0] + 3*p1[0] + 3*p2[0] + p3[0]) / 8, (p0[1] + 3*p1[1] + 3*p2[1] + p3[1]) / 8];
|
||||
};
|
||||
|
||||
const getAngle = function(xO, yO, xA, yA, xB, yB) {
|
||||
// calculate angle of rotation in absolute value
|
||||
// cos(AOB) = (OA.OB)/(||OA||*||OB||) where OA.OB = (xA-xO)*(xB-xO) + (yA-yO)*(yB-yO)
|
||||
let cos = ((xA - xO)*(xB - xO) + (yA - yO)*(yB - yO)) / (Math.hypot(xA - xO, yA - yO) * Math.hypot(xB - xO, yB - yO));
|
||||
|
||||
// acos is defined on [-1, 1] but
|
||||
// with A == B and imperfect computer calculations, cos may be equal to 1.00000001.
|
||||
cos = Math.min(Math.max(-1, cos), 1);
|
||||
let angle = Math.acos( cos );
|
||||
|
||||
// determine the sign of the angle
|
||||
if (xA == xO) {
|
||||
if (xB > xO)
|
||||
angle = -angle;
|
||||
} else {
|
||||
// equation of OA: y = ax + b
|
||||
let a = (yA - yO) / (xA - xO);
|
||||
let b = yA - a*xA;
|
||||
if (yB < a*xB + b)
|
||||
angle = - angle;
|
||||
if (xA < xO)
|
||||
angle = - angle;
|
||||
}
|
||||
|
||||
return angle;
|
||||
};
|
||||
|
||||
Loading…
Reference in New Issue