diff --git a/draw.js b/draw.js
index eef5cd8..4594f73 100644
--- a/draw.js
+++ b/draw.js
@@ -29,7 +29,6 @@ const GObject = imports.gi.GObject;
const Gtk = imports.gi.Gtk;
const Lang = imports.lang;
const Pango = imports.gi.Pango;
-const PangoCairo = imports.gi.PangoCairo;
const St = imports.gi.St;
const Screenshot = imports.ui.screenshot;
@@ -38,12 +37,12 @@ const ExtensionUtils = imports.misc.extensionUtils;
const Me = ExtensionUtils.getCurrentExtension();
const Convenience = ExtensionUtils.getSettings ? ExtensionUtils : Me.imports.convenience;
const Extension = Me.imports.extension;
+const Elements = Me.imports.elements;
const Menu = Me.imports.menu;
const _ = imports.gettext.domain(Me.metadata['gettext-domain']).gettext;
const CAIRO_DEBUG_EXTENDS = false;
const SVG_DEBUG_EXTENDS = false;
-const SVG_DEBUG_SUPERPOSES_CAIRO = false;
const TEXT_CURSOR_TIME = 600; // ms
const reverseEnumeration = function(obj) {
@@ -489,7 +488,7 @@ var DrawingArea = new Lang.Class({
if (duplicate) {
// deep cloning
- let copy = new DrawingElement(JSON.parse(JSON.stringify(this.grabbedElement)));
+ let copy = new Elements.DrawingElement(JSON.parse(JSON.stringify(this.grabbedElement)));
this.elements.push(copy);
this.grabbedElement = copy;
}
@@ -572,7 +571,7 @@ var DrawingArea = new Lang.Class({
this._stopDrawing();
});
- this.currentElement = new DrawingElement ({
+ this.currentElement = new Elements.DrawingElement ({
shape: this.currentTool,
color: this.currentColor.to_string(),
line: { lineWidth: this.currentLineWidth, lineJoin: this.currentLineJoin, lineCap: this.currentLineCap },
@@ -1157,7 +1156,7 @@ var DrawingArea = new Lang.Class({
return;
if (contents instanceof Uint8Array)
contents = ByteArray.toString(contents);
- this.elements.push(...JSON.parse(contents).map(object => new DrawingElement(object)));
+ this.elements.push(...JSON.parse(contents).map(object => new Elements.DrawingElement(object)));
if (notify)
this.emit('show-osd', 'document-open-symbolic', name, "", -1, false);
@@ -1202,700 +1201,3 @@ var DrawingArea = new Lang.Class({
}
});
-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
-
-// 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 = new Lang.Class({
- Name: 'DrawOnYourScreenDrawingElement',
-
- _init: function(params) {
- for (let key in params)
- this[key] = params[key];
-
- // compatibility with json generated by old extension versions
-
- if (params.fillRule === undefined)
- this.fillRule = Cairo.FillRule.WINDING;
- if (params.transformations === undefined)
- 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)
- this.font.weight = 700;
- }
-
- if (params.transform && params.transform.center) {
- let angle = (params.transform.angle || 0) + (params.transform.startAngle || 0);
- if (angle)
- 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]];
- // 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;
- },
-
- // toJSON is called by JSON.stringify
- toJSON: function() {
- 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,
- text: this.text,
- lineIndex: this.lineIndex !== undefined ? this.lineIndex : undefined,
- textRightAligned: this.textRightAligned,
- font: this.font,
- points: this.points.map((point) => [Math.round(point[0]*100)/100, Math.round(point[1]*100)/100])
- };
- },
-
- buildCairo: function(cr, params) {
- let [success, color] = Clutter.Color.from_string(this.color);
- if (success)
- Clutter.cairo_set_source_color(cr, color);
-
- if (this.showSymmetryElement) {
- let transformation = this.lastTransformation;
- setDummyStroke(cr);
- if (transformation.type == Transformations.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();
- }
-
- 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 && 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) {
- Clutter.cairo_set_source_color(cr, Clutter.Color.new(255, 0, 0, 255));
- cr.setLineWidth(this.line.lineWidth / 2 || 1);
- }
-
- 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);
- 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]);
- cr.rotate(transformation.angle);
- cr.scale(transformation.scaleX, transformation.scaleY);
- cr.rotate(-transformation.angle);
- cr.translate(-center[0], -center[1]);
- } else if (transformation.type == Transformations.REFLECTION || transformation.type == Transformations.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);
- }
- });
-
- let [points, shape] = [this.points, this.shape];
-
- if (shape == Shapes.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 == Shapes.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 == Shapes.NONE || shape == Shapes.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 == Shapes.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 == Shapes.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 == Shapes.POLYGON || shape == Shapes.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 == Shapes.POLYGON)
- cr.closePath();
-
- } else if (shape == Shapes.TEXT && points.length == 2) {
- let layout = PangoCairo.create_layout(cr);
- let fontSize = Math.abs(points[1][1] - points[0][1]) * Pango.SCALE;
- let fontDescription = new Pango.FontDescription();
- fontDescription.set_absolute_size(fontSize);
- ['family', 'weight', 'style', 'stretch', 'variant'].forEach(attribute => {
- if (this.font[attribute] !== undefined)
- try {
- fontDescription[`set_${attribute}`](this.font[attribute]);
- } catch(e) {}
- });
- layout.set_font_description(fontDescription);
- layout.set_text(this.text, -1);
- this.textWidth = layout.get_pixel_size()[0];
- cr.moveTo(points[1][0] - (this.textRightAligned ? this.textWidth : 0), Math.max(points[0][1],points[1][1]) - layout.get_baseline() / Pango.SCALE);
- layout.set_text(this.text, -1);
- PangoCairo.show_layout(cr, layout);
-
- if (params.showTextCursor) {
- let cursorPosition = this.cursorPosition == -1 ? this.text.length : this.cursorPosition;
- layout.set_text(this.text.slice(0, cursorPosition), -1);
- let width = layout.get_pixel_size()[0];
- cr.rectangle(points[1][0] - (this.textRightAligned ? this.textWidth : 0) + width, Math.max(points[0][1],points[1][1]),
- Math.abs(points[1][1] - points[0][1]) / 25, - Math.abs(points[1][1] - points[0][1]));
- cr.fill();
- }
-
- if (params.showTextRectangle || params.drawTextRectangle) {
- cr.rectangle(points[1][0] - (this.textRightAligned ? this.textWidth : 0), Math.max(points[0][1], points[1][1]),
- this.textWidth, - Math.abs(points[1][1] - points[0][1]));
- if (params.showTextRectangle)
- setDummyStroke(cr);
- else
- // Only draw the rectangle to find the element, not to show it.
- cr.setLineWidth(0);
- }
- }
-
- cr.identityMatrix();
- },
-
- getContainsPoint: function(cr, x, y) {
- if (this.shape == Shapes.TEXT)
- return cr.inFill(x, y);
-
- cr.save();
- cr.setLineWidth(Math.max(this.line.lineWidth, 25));
- cr.setDash([], 0);
-
- // Check whether the point is inside/on/near the element.
- let inElement = cr.inStroke(x, y) || this.fill && cr.inFill(x, y);
- cr.restore();
- return inElement;
- },
-
- buildSVG: function(bgColor) {
- let row = "\n ";
- let points = this.points.map((point) => [Math.round(point[0]*100)/100, Math.round(point[1]*100)/100]);
- let color = this.eraser ? bgColor : this.color;
- let fill = this.fill && !this.isStraightLine;
- let attributes = '';
-
- if (fill) {
- attributes = `fill="${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}, ${-transformation.slideY})`;
- }
- });
- transAttribute += transAttribute ? '"' : '';
-
- if (this.shape == Shapes.LINE && points.length == 4) {
- row += ``;
-
- } else if (this.shape == Shapes.LINE && points.length == 3) {
- row += ``;
-
- } else if (this.shape == Shapes.LINE) {
- row += ``;
-
- } else if (this.shape == Shapes.NONE) {
- row += ``;
-
- } else if (this.shape == Shapes.ELLIPSE && points.length == 3) {
- let ry = Math.hypot(points[1][0] - points[0][0], points[1][1] - points[0][1]);
- let rx = Math.hypot(points[2][0] - points[0][0], points[2][1] - points[0][1]);
- row += ``;
-
- } else if (this.shape == Shapes.ELLIPSE && points.length == 2) {
- let r = Math.hypot(points[1][0] - points[0][0], points[1][1] - points[0][1]);
- row += ``;
-
- } else if (this.shape == Shapes.RECTANGLE && points.length == 2) {
- row += ``;
-
- } else if (this.shape == Shapes.POLYGON && points.length >= 3) {
- row += ``;
-
- } else if (this.shape == Shapes.POLYLINE && points.length >= 2) {
- row += ``;
-
- } else if (this.shape == Shapes.TEXT && points.length == 2) {
- attributes = `fill="${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 += `${this.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;
-};
-