482 lines
13 KiB
C++
482 lines
13 KiB
C++
//
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// Copyright (C) 2017 James Turner zakalawe@mac.com
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (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, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// 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, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#include "fgcanvaselement.h"
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#include "localprop.h"
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#include "fgcanvaspaintcontext.h"
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#include "fgcanvasgroup.h"
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#include "canvasitem.h"
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#include "canvasconnection.h"
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#include <QDebug>
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#include <QPainter>
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#include <QRegularExpression>
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#include <QRegularExpressionMatch>
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#include <QMatrix4x4>
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QTransform qTransformFromCanvas(LocalProp* prop)
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{
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float m[6] = { 1.0, 0.0, 0.0, 1.0, 0.0, 0.0 }; // identity matrix
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for (int i =0; i< 6; ++i) {
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LocalProp* mProp = prop->getOrCreateChildWithNameAndIndex(NameIndexTuple("m", i));
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if (!mProp->value().isNull()) {
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m[i] = mProp->value().toFloat();
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}
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}
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return QTransform(m[0], m[1], 0.0,
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m[2], m[3], 0.0,
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m[4], m[5], 1.0);
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}
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bool FGCanvasElement::isStyleProperty(QByteArray name)
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{
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if ((name == "font") || (name == "line-height") || (name == "alignment")
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|| (name == "character-size") || (name == "fill") || (name == "background"))
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{
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return true;
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}
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return false;
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}
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LocalProp *FGCanvasElement::property() const
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{
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return const_cast<LocalProp*>(_propertyRoot);
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}
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void FGCanvasElement::setHighlighted(bool hilighted)
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{
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_highlighted = hilighted;
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}
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bool FGCanvasElement::isHighlighted() const
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{
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return _highlighted;
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}
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CanvasItem *FGCanvasElement::createQuickItem(QQuickItem *parent)
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{
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return nullptr;
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}
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CanvasItem *FGCanvasElement::quickItem() const
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{
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return nullptr;
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}
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FGCanvasElement::FGCanvasElement(FGCanvasGroup* pr, LocalProp* prop) :
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QObject(pr),
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_propertyRoot(prop),
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_parent(pr)
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{
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connect(prop->getOrCreateWithPath("visible"), &LocalProp::valueChanged,
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[this](QVariant val) {
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_visible = val.toBool();
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requestPolish();
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});
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connect(prop, &LocalProp::childAdded, this, &FGCanvasElement::onChildAdded);
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connect(prop, &LocalProp::childRemoved, this, &FGCanvasElement::onChildRemoved);
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if (pr) {
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pr->markChildZIndicesDirty();
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}
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requestPolish();
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}
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void FGCanvasElement::requestPolish()
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{
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_polishRequired = true;
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}
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void FGCanvasElement::polish()
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{
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bool vis = isVisible();
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auto qq = quickItem();
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if (qq && (qq->isVisible() != vis)) {
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qq->setVisible(vis);
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}
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if (!vis) {
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return;
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}
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if (_clipDirty) {
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parseCSSClip(_propertyRoot->value("clip", QVariant()).toByteArray());
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_clipDirty = false;
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}
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if (qq) {
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qq->setTransform(combinedTransform());
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}
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if (_styleDirty) {
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_fillColor = parseColorValue(getCascadedStyle("fill"));
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_styleDirty = false;
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}
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doPolish();
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_polishRequired = false;
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}
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void FGCanvasElement::paint(FGCanvasPaintContext *context) const
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{
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if (!isVisible()) {
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return;
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}
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QPainter* p = context->painter();
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p->save();
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if (_hasClip)
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{
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// clip is define in parent's coordinate system
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#if 1
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p->save();
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p->setTransform(context->globalCoordinateTransform());
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p->setPen(Qt::yellow);
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p->setBrush(QBrush(Qt::yellow, Qt::DiagCrossPattern));
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p->drawRect(_clipRect);
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p->restore();
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#endif
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QTransform t = p->transform();
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p->setTransform(context->globalCoordinateTransform());
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p->setClipRect(_clipRect);
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p->setClipping(true);
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p->setTransform(t);
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}
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QTransform combined = combinedTransform();
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p->setTransform(combined, true /* combine */);
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if (!_fillColor.isValid()) {
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p->setBrush(Qt::NoBrush);
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} else {
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p->setBrush(_fillColor);
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}
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doPaint(context);
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if (_hasClip) {
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p->setClipping(false);
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}
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p->restore();
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}
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void FGCanvasElement::doPaint(FGCanvasPaintContext* context) const
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{
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Q_UNUSED(context);
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}
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void FGCanvasElement::doPolish()
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{
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}
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QTransform FGCanvasElement::combinedTransform() const
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{
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if (_transformsDirty) {
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_combinedTransform.reset();
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for (LocalProp* tfProp : _propertyRoot->childrenWithName("tf")) {
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_combinedTransform *= qTransformFromCanvas(tfProp);
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}
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#if 0
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QPointF offset(_propertyRoot->value("center-offset-x", 0.0).toFloat(),
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_propertyRoot->value("center-offset-y", 0.0).toFloat());
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_combinedTransform.translate(offset.x(), offset.y());
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#endif
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_transformsDirty = false;
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}
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return _combinedTransform;
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}
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bool FGCanvasElement::isVisible() const
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{
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return _visible;
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}
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int FGCanvasElement::zIndex() const
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{
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return _zIndex;
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}
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const FGCanvasGroup *FGCanvasElement::parentGroup() const
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{
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return _parent;
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}
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CanvasConnection *FGCanvasElement::connection() const
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{
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if (_parent)
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return _parent->connection();
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return qobject_cast<CanvasConnection*>(parent());
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}
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bool FGCanvasElement::onChildAdded(LocalProp *prop)
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{
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const QByteArray nm = prop->name();
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if (nm == "tf") {
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connect(prop, &LocalProp::childAdded, this, &FGCanvasElement::onChildAdded);
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return true;
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} else if (nm == "visible") {
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return true;
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} else if (nm == "tf-rot-index") {
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// ignored, this is noise from the Nasal SVG parswer
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return true;
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} else if (nm.startsWith("center-offset-")) {
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// ignored, this is noise from the Nasal SVG parswer
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return true;
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} else if (nm == "center") {
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connect(prop, &LocalProp::valueChanged, this, &FGCanvasElement::onCenterChanged);
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return true;
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} else if (nm == "m") {
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if ((prop->parent()->name() == "tf") && (prop->parent()->parent() == _propertyRoot)) {
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connect(prop, &LocalProp::valueChanged, this, &FGCanvasElement::markTransformsDirty);
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return true;
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} else {
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qWarning() << "saw confusing 'm' property" << prop->path();
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}
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} else if (nm == "m-geo") {
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// ignore for now, we do geo projection server-side
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return true;
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} else if (nm == "id") {
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connect(prop, &LocalProp::valueChanged, [this](QVariant value) { _svgElementId = value.toByteArray(); });
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return true;
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} else if (prop->name() == "update") {
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// disable updates optionally?
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return true;
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} else if (nm == "clip") {
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connect(prop, &LocalProp::valueChanged, this, &FGCanvasElement::markClipDirty);
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return true;
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}
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if (isStyleProperty(nm)) {
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connect(prop, &LocalProp::valueChanged, this, &FGCanvasElement::markStyleDirty);
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return true;
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}
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if (prop->name() == "layer-type") {
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connect(prop, &LocalProp::valueChanged, [this](QVariant value)
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{qDebug() << "layer-type:" << value.toByteArray() << "on" << _propertyRoot->path(); });
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return true;
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} else if (prop->name() == "z-index") {
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connect(prop, &LocalProp::valueChanged, this, &FGCanvasElement::markZIndexDirty);
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return true;
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}
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return false;
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}
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bool FGCanvasElement::onChildRemoved(LocalProp *prop)
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{
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const QByteArray nm = prop->name();
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if ((nm == "tf") || (nm == "m")) {
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markTransformsDirty();
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return true;
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}
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return false;
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}
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QColor FGCanvasElement::fillColor() const
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{
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return _fillColor;
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}
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void FGCanvasElement::onCenterChanged(QVariant value)
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{
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LocalProp* senderProp = static_cast<LocalProp*>(sender());
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int centerTerm = senderProp->index();
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if (centerTerm == 0) {
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_center.setX(value.toFloat());
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} else {
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_center.setY(value.toFloat());
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}
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requestPolish();
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}
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void FGCanvasElement::markTransformsDirty()
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{
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_transformsDirty = true;
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requestPolish();
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}
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void FGCanvasElement::markClipDirty()
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{
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_clipDirty = true;
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requestPolish();
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}
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float FGCanvasElement::parseCSSValue(QByteArray value) const
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{
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value = value.trimmed();
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// deal with %, px suffixes
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if (value.indexOf('%') >= 0) {
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qWarning() << Q_FUNC_INFO << "extend parsing to deal with:" << value;
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}
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if (value.endsWith("px")) {
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value.truncate(value.length() - 2);
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}
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bool ok = false;
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float v = value.toFloat(&ok);
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if (!ok) {
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qWarning() << "failed to parse:" << value;
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}
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return v;
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}
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QColor FGCanvasElement::parseColorValue(QVariant value) const
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{
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QString colorString = value.toString();
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if (colorString.isEmpty() || colorString == "none") {
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return QColor(); // return an invalid color
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}
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int alpha = 255;
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int red = 0;
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int green = 0;
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int blue = 0;
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bool good = false;
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if (colorString.startsWith('#')) {
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// web style
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if (colorString.length() == 9) {
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QRegularExpression re("#([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})");
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QRegularExpressionMatch match = re.match(colorString);
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if (match.hasMatch()) {
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red = match.captured(1).toInt(nullptr, 16);
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green = match.captured(2).toInt(nullptr, 16);
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blue = match.captured(3).toInt(nullptr, 16);
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alpha = match.captured(4).toInt(nullptr, 16);
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good = true;
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}
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} else if (colorString.length() == 7) {
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// long form, RGB
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QRegularExpression re("#([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})");
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QRegularExpressionMatch match = re.match(colorString);
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if (match.hasMatch()) {
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red = match.captured(1).toInt(nullptr, 16);
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green = match.captured(2).toInt(nullptr, 16);
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blue = match.captured(3).toInt(nullptr, 16);
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good = true;
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}
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}
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} else if (colorString.startsWith("rgb")) {
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// try rgb(ddd, ddd, ddd) syntax
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QRegularExpression re("rgb\\((\\d*),(\\d*),(\\d*)\\)");
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QRegularExpressionMatch match = re.match(value.toString());
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if (match.hasMatch()) {
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red = match.captured(1).toInt();
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green = match.captured(2).toInt();
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blue = match.captured(3).toInt();
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good = true;
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}
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QRegularExpression re2("rgba\\((\\d*),(\\d*),(\\d*),(\\d*)\\)");
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match = re2.match(value.toString());
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if (match.hasMatch()) {
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red = match.captured(1).toInt();
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green = match.captured(2).toInt();
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blue = match.captured(3).toInt();
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alpha = match.captured(4).toInt() * 255;
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good = true;
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}
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}
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if (good) {
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return QColor(red, green, blue, alpha);
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}
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qWarning() << _propertyRoot->path() << "failed to parse color:" << colorString;
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return Qt::magenta; // default horrible colour
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}
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void FGCanvasElement::markStyleDirty()
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{
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_styleDirty = true;
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requestPolish();
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// group will cascade
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}
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QVariant FGCanvasElement::getCascadedStyle(const char *name, QVariant defaultValue) const
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{
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LocalProp* style = _propertyRoot->childWithNameAndIndex(NameIndexTuple(name, 0));
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if (style) {
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return style->value();
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}
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if (_parent) {
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return _parent->getCascadedStyle(name);
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}
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return defaultValue;
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}
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void FGCanvasElement::markZIndexDirty(QVariant value)
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{
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_zIndex = value.toInt();
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_parent->markChildZIndicesDirty();
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}
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void FGCanvasElement::onVisibleChanged(QVariant value)
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{
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_visible = value.toBool();
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requestPolish();
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}
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void FGCanvasElement::parseCSSClip(QByteArray value)
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{
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if (value.isEmpty()) {
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_hasClip = false;
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return;
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}
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// https://www.w3.org/wiki/CSS/Properties/clip for the stupid order here
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if (value.startsWith("rect(")) {
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int closingParen = value.indexOf(')');
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value = value.mid(5, closingParen - 5); // trim front portion
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}
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QByteArrayList clipRectDesc = value.split(',');
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const int parts = clipRectDesc.size();
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if (parts != 4) {
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qWarning() << "implement parsing for non-standard clip" << value;
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return;
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}
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const float top = parseCSSValue(clipRectDesc.at(0));
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const float right = parseCSSValue(clipRectDesc.at(1));
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const float bottom = parseCSSValue(clipRectDesc.at(2));
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const float left = parseCSSValue(clipRectDesc.at(3));
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_clipRect = QRectF(left, top, right - left, bottom - top);
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qDebug() << "final clip rect:" << _clipRect << "from" << value;
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_hasClip = true;
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requestPolish();
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}
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