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DrawOnYourScreen
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Render texts with Pango 

Cairo "toy" text tool does not render non-latin and emoji characters.
Moreover Pango provides a larger set of font attributes.

Fixes #29, #34
This commit is contained in:
abakkk 2020-06-26 12:19:53 +02:00
parent 5bf0ccc4f1
commit 8519948c3b
3 changed files with 91 additions and 63 deletions
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3
data/default.css
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@ -29,9 +29,6 @@
* Only one family : no comma separated list of families like "font1, font2, ..., Sans-Serif".
* Font family can be any font installed, or a generic family name (Serif, Sans-Serif, Monospace, Cursive, Fantasy).
* Font weight and font style : no upper case when string.
* Weight <= 500 (or lighter, normal, medium) is rendered as normal.
* Weight > 500 (or bolder, bold) is rendered as bold.
* Oblique and italic style supports depend on the font family and seem to be rendered identically.
*
*/

122
draw.js
View File

@ -28,7 +28,8 @@ const GLib = imports.gi.GLib;
const GObject = imports.gi.GObject;
const Gtk = imports.gi.Gtk;
const Lang = imports.lang;
const PangoMatrix = imports.gi.Pango.Matrix;
const Pango = imports.gi.Pango;
const PangoCairo = imports.gi.PangoCairo;
const St = imports.gi.St;
const BoxPointer = imports.ui.boxpointer;
@ -63,17 +64,25 @@ const FILLRULE_EVENODD_ICON_PATH = ICON_DIR.get_child('fillrule-evenodd-symbolic
const DASHED_LINE_ICON_PATH = ICON_DIR.get_child('dashed-line-symbolic.svg').get_path();
const FULL_LINE_ICON_PATH = ICON_DIR.get_child('full-line-symbolic.svg').get_path();
const reverseEnumeration = function(obj) {
return Object.fromEntries(Object.entries(obj).map(entry => [entry[1], entry[0].slice(0,1) + entry[0].slice(1).toLowerCase()]));
};
const Shapes = { NONE: 0, LINE: 1, ELLIPSE: 2, RECTANGLE: 3, TEXT: 4, POLYGON: 5, POLYLINE: 6 };
const Manipulations = { MOVE: 100, RESIZE: 101, MIRROR: 102 };
var Tools = Object.assign({}, Shapes, Manipulations);
const Transformations = { TRANSLATION: 0, ROTATION: 1, SCALE_PRESERVE: 2, STRETCH: 3, REFLECTION: 4, INVERSION: 5 };
const ToolNames = { 0: "Free drawing", 1: "Line", 2: "Ellipse", 3: "Rectangle", 4: "Text", 5: "Polygon", 6: "Polyline", 100: "Move", 101: "Resize", 102: "Mirror" };
const LineCapNames = { 0: 'Butt', 1: 'Round', 2: 'Square' };
const LineJoinNames = { 0: 'Miter', 1: 'Round', 2: 'Bevel' };
const LineCapNames = reverseEnumeration(Cairo.LineCap);
const LineJoinNames = reverseEnumeration(Cairo.LineJoin);
const FillRuleNames = { 0: 'Nonzero', 1: 'Evenodd' };
const FontWeightNames = { 0: 'Normal', 1: 'Bold' };
const FontStyleNames = { 0: 'Normal', 1: 'Italic', 2: 'Oblique' };
const FontFamilyNames = { 0: 'Theme', 1: 'Sans-Serif', 2: 'Serif', 3: 'Monospace', 4: 'Cursive', 5: 'Fantasy' };
const FontGenericNames = { 0: 'Theme', 1: 'Sans-Serif', 2: 'Serif', 3: 'Monospace', 4: 'Cursive', 5: 'Fantasy' };
const FontStyleNames = reverseEnumeration(Pango.Style);
const FontWeightNames = Object.assign(
reverseEnumeration(Pango.Weight),
{ 200: "Ultra-light", 350: "Semi-light", 600: "Semi-bold", 800: "Ultra-bold" }
);
delete FontWeightNames[Pango.Weight.ULTRAHEAVY];
const getDateString = function() {
let date = GLib.DateTime.new_now_local();
@ -136,7 +145,7 @@ var DrawingArea = new Lang.Class({
this.undoneElements = [];
this.currentElement = null;
this.currentTool = Shapes.NONE;
this.currentFontFamilyId = 0;
this.currentFontGeneric = 0;
this.isSquareArea = false;
this.hasGrid = false;
this.hasBackground = false;
@ -191,7 +200,7 @@ var DrawingArea = new Lang.Class({
}
let font = themeNode.get_font();
this.newThemeAttributes.ThemeFontFamily = font.get_family();
this.newThemeAttributes.FontWeight = font.get_weight();
try { this.newThemeAttributes.FontWeight = font.get_weight(); } catch(e) { this.newThemeAttributes.FontWeight = Pango.Weight.NORMAL; }
this.newThemeAttributes.FontStyle = font.get_style();
this.newThemeAttributes.LineWidth = themeNode.get_length('-drawing-line-width');
this.newThemeAttributes.LineJoin = themeNode.get_double('-drawing-line-join');
@ -214,13 +223,12 @@ var DrawingArea = new Lang.Class({
this.colors[i] = this.colors[i].alpha ? this.colors[i] : this.colors[0];
}
this.currentColor = this.currentColor || this.colors[1];
// SVG does not support 'Ultra-heavy' weight (1000)
this.newThemeAttributes.FontWeight = Math.min(this.newThemeAttributes.FontWeight, 900);
this.newThemeAttributes.LineWidth = (this.newThemeAttributes.LineWidth > 0) ? this.newThemeAttributes.LineWidth : 3;
this.newThemeAttributes.LineJoin = ([0, 1, 2].indexOf(this.newThemeAttributes.LineJoin) != -1) ? this.newThemeAttributes.LineJoin : Cairo.LineJoin.ROUND;
this.newThemeAttributes.LineCap = ([0, 1, 2].indexOf(this.newThemeAttributes.LineCap) != -1) ? this.newThemeAttributes.LineCap : Cairo.LineCap.ROUND;
this.newThemeAttributes.FillRule = ([0, 1].indexOf(this.newThemeAttributes.FillRule) != -1) ? this.newThemeAttributes.FillRule : Cairo.FillRule.WINDING;
this.newThemeAttributes.FontWeight = this.newThemeAttributes.FontWeight > 500 ? 1 : 0 ;
// font style enum order of Cairo and Pango are different
this.newThemeAttributes.FontStyle = this.newThemeAttributes.FontStyle == 2 ? 1 : ( this.newThemeAttributes.FontStyle == 1 ? 2 : 0);
for (const attributeName in this.newThemeAttributes) {
if (this.newThemeAttributes[attributeName] != this.oldThemeAttributes[attributeName]) {
this.oldThemeAttributes[attributeName] = this.newThemeAttributes[attributeName];
@ -559,13 +567,13 @@ var DrawingArea = new Lang.Class({
fillRule: this.currentFillRule,
eraser: eraser,
transform: { active: false, center: [0, 0], angle: 0, startAngle: 0, ratio: 1 },
text: '',
font: { family: (this.currentFontFamilyId == 0 ? this.currentThemeFontFamily : FontFamilyNames[this.currentFontFamilyId]), weight: this.currentFontWeight, style: this.currentFontStyle },
points: []
});
if (this.currentTool == Shapes.TEXT) {
this.currentElement.fill = false;
this.currentElement.font = { family: (this.currentFontGeneric == 0 ? this.currentThemeFontFamily : FontGenericNames[this.currentFontGeneric]),
weight: this.currentFontWeight, style: this.currentFontStyle };
this.currentElement.text = _("Text");
this.currentElement.rtl = ENABLE_RTL && this.get_text_direction() == Clutter.TextDirection.RTL;
}
@ -869,17 +877,19 @@ var DrawingArea = new Lang.Class({
},
toggleFontWeight: function() {
this.currentFontWeight = this.currentFontWeight == 1 ? 0 : this.currentFontWeight + 1;
if (this.currentElement) {
let fontWeights = Object.keys(FontWeightNames).map(key => Number(key));
let index = fontWeights.indexOf(this.currentFontWeight);
this.currentFontWeight = index == fontWeights.length - 1 ? fontWeights[0] : fontWeights[index + 1];
if (this.currentElement && this.currentElement.font) {
this.currentElement.font.weight = this.currentFontWeight;
this._redisplay();
}
this.emit('show-osd', null, `<span font_weight="${FontWeightNames[this.currentFontWeight].toLowerCase()}">${_(FontWeightNames[this.currentFontWeight])}</span>`, "", -1);
this.emit('show-osd', null, `<span font_weight="${this.currentFontWeight}">${_(FontWeightNames[this.currentFontWeight])}</span>`, "", -1);
},
toggleFontStyle: function() {
this.currentFontStyle = this.currentFontStyle == 2 ? 0 : this.currentFontStyle + 1;
if (this.currentElement) {
if (this.currentElement && this.currentElement.font) {
this.currentElement.font.style = this.currentFontStyle;
this._redisplay();
}
@ -887,9 +897,9 @@ var DrawingArea = new Lang.Class({
},
toggleFontFamily: function() {
this.currentFontFamilyId = this.currentFontFamilyId == 5 ? 0 : this.currentFontFamilyId + 1;
let currentFontFamily = this.currentFontFamilyId == 0 ? this.currentThemeFontFamily : FontFamilyNames[this.currentFontFamilyId];
if (this.currentElement) {
this.currentFontGeneric = this.currentFontGeneric == 5 ? 0 : this.currentFontGeneric + 1;
let currentFontFamily = this.currentFontGeneric == 0 ? this.currentThemeFontFamily : FontGenericNames[this.currentFontGeneric];
if (this.currentElement && this.currentElement.font) {
this.currentElement.font.family = currentFontFamily;
this._redisplay();
}
@ -1187,8 +1197,14 @@ const DrawingElement = new Lang.Class({
this.fillRule = Cairo.FillRule.WINDING;
if (params.transformations === undefined)
this.transformations = [];
if (params.shape == Shapes.TEXT && params.rtl === undefined)
if (params.shape == Shapes.TEXT) {
if (params.rtl === undefined)
this.rtl = false;
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);
@ -1328,44 +1344,32 @@ const DrawingElement = new Lang.Class({
cr.closePath();
} else if (shape == Shapes.TEXT && points.length == 2) {
cr.selectFontFace(this.font.family, this.font.style, this.font.weight);
cr.setFontSize(Math.abs(points[1][1] - points[0][1]));
let textWidth = 0;
if (this.rtl) {
cr.save();
cr.setSourceRGBA(0, 0, 0, 0);
cr.setOperator(Cairo.Operator.OVER);
cr.moveTo(points[1][0], Math.max(points[0][1], points[1][1]));
cr.showText(this.text);
textWidth = cr.getCurrentPoint()[0] - points[1][0];
cr.restore();
}
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_family(this.font.family);
fontDescription.set_style(this.font.style);
fontDescription.set_weight(this.font.weight);
fontDescription.set_absolute_size(fontSize);
layout.set_font_description(fontDescription);
layout.set_text(this.text, -1);
this.textWidth = layout.get_pixel_size()[0];
cr.moveTo(points[1][0] - (this.rtl ? 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;
let texts = [this.text.slice(0, cursorPosition), this.text.slice(cursorPosition)];
cr.moveTo(points[1][0] - textWidth, Math.max(points[0][1], points[1][1]));
cr.showText(texts[0]);
let currentPoint1 = cr.getCurrentPoint();
cr.rectangle(currentPoint1[0], currentPoint1[1], Math.abs(points[1][1] - points[0][1]) / 25, - Math.abs(points[1][1] - points[0][1]));
layout.set_text(this.text.slice(0, cursorPosition), -1);
let width = layout.get_pixel_size()[0];
cr.rectangle(points[1][0] - (this.rtl ? 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();
cr.moveTo(currentPoint1[0], currentPoint1[1]);
cr.showText(texts[1]);
textWidth = this.rtl ? textWidth : (cr.getCurrentPoint()[0] - points[1][0]);
} else {
cr.moveTo(points[1][0] - textWidth, Math.max(points[0][1], points[1][1]));
cr.showText(this.text);
textWidth = this.rtl ? textWidth : (cr.getCurrentPoint()[0] - points[1][0]);
}
if (!params.showTextCursor)
this.textWidth = textWidth;
if (params.showTextRectangle || params.drawTextRectangle) {
cr.rectangle(points[1][0] - (this.rtl ? textWidth : 0), Math.max(points[0][1], points[1][1]),
textWidth, - Math.abs(points[1][1] - points[0][1]));
cr.rectangle(points[1][0] - (this.rtl ? 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
@ -1490,7 +1494,7 @@ const DrawingElement = new Lang.Class({
`stroke-opacity="0" ` +
`font-family="${this.font.family}" ` +
`font-size="${Math.abs(points[1][1] - points[0][1])}" ` +
`font-weight="${FontWeightNames[this.font.weight].toLowerCase()}" ` +
`font-weight="${this.font.weight}" ` +
`font-style="${FontStyleNames[this.font.style].toLowerCase()}"`;
row += `<text ${attributes} x="${points[1][0] - this.rtl * this.textWidth}" `;
@ -1716,7 +1720,7 @@ const DrawingElement = new Lang.Class({
// The figure rotation center, whose position is affected by all transformations done before 'transformation'.
_getTransformedCenter: function(transformation) {
if (!transformation.elementTransformedCenter) {
let matrix = new PangoMatrix({ xx: 1, xy: 0, yx: 0, yy: 1, x0: 0, y0: 0 });
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
@ -2114,9 +2118,9 @@ const DrawingMenu = new Lang.Class({
this.lineSection = lineSection;
let fontSection = new PopupMenu.PopupMenuSection();
let FontFamilyNamesCopy = Object.create(FontFamilyNames);
FontFamilyNamesCopy[0] = this.area.currentThemeFontFamily;
this._addSubMenuItem(fontSection, 'font-x-generic-symbolic', FontFamilyNamesCopy, this.area, 'currentFontFamilyId');
let FontGenericNamesCopy = Object.create(FontGenericNames);
FontGenericNamesCopy[0] = this.area.currentThemeFontFamily;
this._addSubMenuItem(fontSection, 'font-x-generic-symbolic', FontGenericNamesCopy, this.area, 'currentFontGeneric');
this._addSubMenuItem(fontSection, 'format-text-bold-symbolic', FontWeightNames, this.area, 'currentFontWeight');
this._addSubMenuItem(fontSection, 'format-text-italic-symbolic', FontStyleNames, this.area, 'currentFontStyle');
this._addSeparator(fontSection);
@ -2236,10 +2240,10 @@ const DrawingMenu = new Lang.Class({
GLib.idle_add(GLib.PRIORITY_DEFAULT_IDLE, () => {
for (let i in obj) {
let text;
if (targetProperty == 'currentFontFamilyId')
if (targetProperty == 'currentFontGeneric')
text = `<span font_family="${obj[i]}">${_(obj[i])}</span>`;
else if (targetProperty == 'currentFontWeight')
text = `<span font_weight="${obj[i].toLowerCase()}">${_(obj[i])}</span>`;
text = `<span font_weight="${i}">${_(obj[i])}</span>`;
else if (targetProperty == 'currentFontStyle')
text = `<span font_style="${obj[i].toLowerCase()}">${_(obj[i])}</span>`;
else

27
locale/draw-on-your-screen.pot
View File

@ -436,12 +436,39 @@ msgstr ""
#msgid "Evenodd"
#msgstr ""
#msgid "Thin"
#msgstr ""
#msgid "Ultra-light"
#msgstr ""
#msgid "Light"
#msgstr ""
#msgid "Semi-light"
#msgstr ""
#msgid "Book"
#msgstr ""
#msgid "Normal"
#msgstr ""
#msgid "Medium"
#msgstr ""
#msgid "Semi-bold"
#msgstr ""
#msgid "Bold"
#msgstr ""
#msgid "Ultra-bold"
#msgstr ""
#msgid "Heavy"
#msgstr ""
#msgid "Italic"
#msgstr ""