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flightgear/utils/fgqcanvas/fgcanvaspath.cpp
James Turner da65411ef4 FGQCanvas clipping / default text color fixes 
Also fix some compiler warnings, but the main thing is text now
defaults to white correctly if no color was set explicitly, and
local/parent clip-reference-frames are supported.
2019-01-17 10:46:58 +00:00

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//
// Copyright (C) 2017 James Turner zakalawe@mac.com
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#include "fgcanvaspath.h"
#include <cctype>
#include <QByteArrayList>
#include <QPainter>
#include <QDebug>
#include <QtMath>
#include <QPen>
#include "fgcanvaspaintcontext.h"
#include "localprop.h"
#include "canvasitem.h"
#include "private/qtriangulator_p.h" // private QtGui header
#include "private/qtriangulatingstroker_p.h" // private QtGui header
#include "private/qvectorpath_p.h" // private QtGui header
#include <QSGGeometry>
#include <QSGGeometryNode>
#include <QSGFlatColorMaterial>
class PathQuickItem : public CanvasItem
{
Q_OBJECT
Q_PROPERTY(QColor fillColor READ fillColor WRITE setFillColor NOTIFY fillColorChanged)
Q_PROPERTY(QPen stroke READ stroke WRITE setStroke NOTIFY strokeChanged)
public:
PathQuickItem(QQuickItem* parent)
: CanvasItem(parent)
{
setFlag(ItemHasContents);
}
void setPath(QPainterPath pp)
{
m_path = pp;
QRectF pathBounds = pp.boundingRect();
setImplicitSize(pathBounds.width(), pathBounds.height());
update(); // request a paint node update
}
QSGNode* updateRealPaintNode(QSGNode* oldNode, QQuickItem::UpdatePaintNodeData *) override
{
if (m_path.isEmpty()) {
return nullptr;
}
delete oldNode;
QSGGeometryNode* fillGeom = nullptr;
QSGGeometryNode* strokeGeom = nullptr;
if (m_fillColor.isValid()) {
// TODO: compute LOD for qTriangulate based on world transform
QTransform transform;
QTriangleSet triangles = qTriangulate(m_path, transform);
int indexType = GL_UNSIGNED_SHORT;
if (triangles.indices.type() == QVertexIndexVector::UnsignedShort) {
// default is fine
} else if (triangles.indices.type() == QVertexIndexVector::UnsignedInt) {
indexType = GL_UNSIGNED_INT;
} else {
qFatal("Unsupported triangle index type");
}
QSGGeometry* sgGeom = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(),
triangles.vertices.size() >> 1,
triangles.indices.size(),
indexType);
sgGeom->setIndexDataPattern(QSGGeometry::StaticPattern);
sgGeom->setDrawingMode(GL_TRIANGLES);
//
QSGGeometry::Point2D *points = sgGeom->vertexDataAsPoint2D();
for (int v=0; v < triangles.vertices.size(); ) {
const float vx = triangles.vertices.at(v++);
const float vy = triangles.vertices.at(v++);
(points++)->set(vx, vy);
}
if (triangles.indices.type() == QVertexIndexVector::UnsignedShort) {
quint16* indices = sgGeom->indexDataAsUShort();
::memcpy(indices, triangles.indices.data(), sizeof(unsigned short) * triangles.indices.size());
} else {
quint32* indices = sgGeom->indexDataAsUInt();
::memcpy(indices, triangles.indices.data(), sizeof(quint32) * triangles.indices.size());
}
// create the node now, pretty trivial
fillGeom = new QSGGeometryNode;
fillGeom->setGeometry(sgGeom);
fillGeom->setFlag(QSGNode::OwnsGeometry);
QSGFlatColorMaterial* mat = new QSGFlatColorMaterial();
mat->setColor(m_fillColor);
fillGeom->setMaterial(mat);
fillGeom->setFlag(QSGNode::OwnsMaterial);
}
if (m_stroke.style() != Qt::NoPen) {
const QVectorPath& vp = qtVectorPathForPath(m_path);
QRectF clipBounds;
QTriangulatingStroker ts;
QPainter::RenderHints renderHints;
if (m_stroke.style() == Qt::SolidLine) {
ts.process(vp, m_stroke, clipBounds, renderHints);
#if 0
inline int vertexCount() const { return m_vertices.size(); }
inline const float *vertices() const { return m_vertices.data(); }
#endif
} else {
QDashedStrokeProcessor dasher;
dasher.process(vp, m_stroke, clipBounds, renderHints);
QVectorPath dashStroke(dasher.points(),
dasher.elementCount(),
dasher.elementTypes(),
renderHints);
ts.process(dashStroke, m_stroke, clipBounds, renderHints);
}
QSGGeometry* sgGeom = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(),
ts.vertexCount() >> 1);
sgGeom->setVertexDataPattern(QSGGeometry::StaticPattern);
sgGeom->setDrawingMode(GL_TRIANGLE_STRIP);
QSGGeometry::Point2D *points = sgGeom->vertexDataAsPoint2D();
const float* vPtr = ts.vertices();
for (int v=0; v < ts.vertexCount(); v += 2) {
const float vx = *vPtr++;
const float vy = *vPtr++;
(points++)->set(vx, vy);
}
// create the node now, pretty trivial
strokeGeom = new QSGGeometryNode;
strokeGeom->setGeometry(sgGeom);
strokeGeom->setFlag(QSGNode::OwnsGeometry);
QSGFlatColorMaterial* mat = new QSGFlatColorMaterial();
mat->setColor(m_stroke.color());
strokeGeom->setMaterial(mat);
strokeGeom->setFlag(QSGNode::OwnsMaterial);
}
if (fillGeom && strokeGeom) {
QSGNode* groupNode = new QSGNode;
groupNode->appendChildNode(fillGeom);
groupNode->appendChildNode(strokeGeom);
return groupNode;
} else if (fillGeom) {
return fillGeom;
}
return strokeGeom;
}
QColor fillColor() const
{
return m_fillColor;
}
QPen stroke() const
{
return m_stroke;
}
public slots:
void setFillColor(QColor fillColor)
{
if (m_fillColor == fillColor)
return;
m_fillColor = fillColor;
emit fillColorChanged(fillColor);
update();
}
void setStroke(QPen stroke)
{
if (m_stroke == stroke)
return;
m_stroke = stroke;
emit strokeChanged(stroke);
update();
}
signals:
void fillColorChanged(QColor fillColor);
void strokeChanged(QPen stroke);
protected:
void geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry) override
{
QQuickItem::geometryChanged(newGeometry, oldGeometry);
update();
}
QRectF boundingRect() const override
{
if ((width() == 0.0) || (height() == 0.0)) {
return QRectF(0.0, 0.0, implicitWidth(), implicitHeight());
}
return QQuickItem::boundingRect();
}
private:
QPainterPath m_path;
QColor m_fillColor;
QPen m_stroke;
};
static void pathArcSegment(QPainterPath &path,
qreal xc, qreal yc,
qreal th0, qreal th1,
qreal rx, qreal ry, qreal xAxisRotation)
{
qreal sinTh, cosTh;
qreal a00, a01, a10, a11;
qreal x1, y1, x2, y2, x3, y3;
qreal t;
qreal thHalf;
sinTh = qSin(xAxisRotation * (M_PI / 180.0));
cosTh = qCos(xAxisRotation * (M_PI / 180.0));
a00 = cosTh * rx;
a01 = -sinTh * ry;
a10 = sinTh * rx;
a11 = cosTh * ry;
thHalf = 0.5 * (th1 - th0);
t = (8.0 / 3.0) * qSin(thHalf * 0.5) * qSin(thHalf * 0.5) / qSin(thHalf);
x1 = xc + qCos(th0) - t * qSin(th0);
y1 = yc + qSin(th0) + t * qCos(th0);
x3 = xc + qCos(th1);
y3 = yc + qSin(th1);
x2 = x3 + t * qSin(th1);
y2 = y3 - t * qCos(th1);
path.cubicTo(a00 * x1 + a01 * y1, a10 * x1 + a11 * y1,
a00 * x2 + a01 * y2, a10 * x2 + a11 * y2,
a00 * x3 + a01 * y3, a10 * x3 + a11 * y3);
}
// the arc handling code underneath is from XSVG (BSD license)
/*
* Copyright 2002 USC/Information Sciences Institute
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of
* Information Sciences Institute not be used in advertising or
* publicity pertaining to distribution of the software without
* specific, written prior permission. Information Sciences Institute
* makes no representations about the suitability of this software for
* any purpose. It is provided "as is" without express or implied
* warranty.
*
* INFORMATION SCIENCES INSTITUTE DISCLAIMS ALL WARRANTIES WITH REGARD
* TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL INFORMATION SCIENCES
* INSTITUTE BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA
* OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*
*/
static void pathArc(QPainterPath &path,
qreal rx,
qreal ry,
qreal x_axis_rotation,
int large_arc_flag,
int sweep_flag,
qreal x,
qreal y,
qreal curx, qreal cury)
{
qreal sin_th, cos_th;
qreal a00, a01, a10, a11;
qreal x0, y0, x1, y1, xc, yc;
qreal d, sfactor, sfactor_sq;
qreal th0, th1, th_arc;
int i, n_segs;
qreal dx, dy, dx1, dy1, Pr1, Pr2, Px, Py, check;
rx = qAbs(rx);
ry = qAbs(ry);
sin_th = qSin(x_axis_rotation * (M_PI / 180.0));
cos_th = qCos(x_axis_rotation * (M_PI / 180.0));
dx = (curx - x) / 2.0;
dy = (cury - y) / 2.0;
dx1 = cos_th * dx + sin_th * dy;
dy1 = -sin_th * dx + cos_th * dy;
Pr1 = rx * rx;
Pr2 = ry * ry;
Px = dx1 * dx1;
Py = dy1 * dy1;
/* Spec : check if radii are large enough */
check = Px / Pr1 + Py / Pr2;
if (check > 1) {
rx = rx * qSqrt(check);
ry = ry * qSqrt(check);
}
a00 = cos_th / rx;
a01 = sin_th / rx;
a10 = -sin_th / ry;
a11 = cos_th / ry;
x0 = a00 * curx + a01 * cury;
y0 = a10 * curx + a11 * cury;
x1 = a00 * x + a01 * y;
y1 = a10 * x + a11 * y;
/* (x0, y0) is current point in transformed coordinate space.
(x1, y1) is new point in transformed coordinate space.
The arc fits a unit-radius circle in this space.
*/
d = (x1 - x0) * (x1 - x0) + (y1 - y0) * (y1 - y0);
sfactor_sq = 1.0 / d - 0.25;
if (sfactor_sq < 0) sfactor_sq = 0;
sfactor = qSqrt(sfactor_sq);
if (sweep_flag == large_arc_flag) sfactor = -sfactor;
xc = 0.5 * (x0 + x1) - sfactor * (y1 - y0);
yc = 0.5 * (y0 + y1) + sfactor * (x1 - x0);
/* (xc, yc) is center of the circle. */
th0 = qAtan2(y0 - yc, x0 - xc);
th1 = qAtan2(y1 - yc, x1 - xc);
th_arc = th1 - th0;
if (th_arc < 0 && sweep_flag)
th_arc += 2 * M_PI;
else if (th_arc > 0 && !sweep_flag)
th_arc -= 2 * M_PI;
n_segs = qCeil(qAbs(th_arc / (M_PI * 0.5 + 0.001)));
for (i = 0; i < n_segs; i++) {
pathArcSegment(path, xc, yc,
th0 + i * th_arc / n_segs,
th0 + (i + 1) * th_arc / n_segs,
rx, ry, x_axis_rotation);
}
}
///////////////////////////////////////////////////////////////////////////////
FGCanvasPath::FGCanvasPath(FGCanvasGroup* pr, LocalProp* prop) :
FGCanvasElement(pr, prop)
{
}
void FGCanvasPath::dumpElement()
{
qDebug() << "Path: at " << _propertyRoot->path();
}
void FGCanvasPath::doPaint(FGCanvasPaintContext *context) const
{
context->painter()->setPen(_stroke);
switch (_paintType) {
case Rect:
context->painter()->drawRect(_rect);
break;
case RoundRect:
context->painter()->drawRoundRect(_rect, _roundRectRadius.width(), _roundRectRadius.height());
break;
case Path:
context->painter()->drawPath(_painterPath);
break;
}
if (isHighlighted()) {
context->painter()->setPen(QPen(Qt::red, 1));
context->painter()->setBrush(Qt::NoBrush);
switch (_paintType) {
case Rect:
case RoundRect:
context->painter()->drawRect(_rect);
break;
case Path:
context->painter()->drawRect(_painterPath.boundingRect());
break;
}
}
}
void FGCanvasPath::doPolish()
{
if (_pathDirty) {
rebuildPath();
if (_quickPath) {
_quickPath->setPath(_painterPath);
}
_pathDirty = false;
}
if (_penDirty) {
rebuildPen();
if (_quickPath) {
_quickPath->setStroke(_stroke);
}
_penDirty = false;
}
if (_quickPath) {
_quickPath->setFillColor(fillColor());
}
}
void FGCanvasPath::markStyleDirty()
{
_penDirty = true;
}
CanvasItem *FGCanvasPath::createQuickItem(QQuickItem *parent)
{
_quickPath = new PathQuickItem(parent);
_quickPath->setPath(_painterPath);
_quickPath->setStroke(_stroke);
_quickPath->setAntialiasing(true);
return _quickPath;
}
CanvasItem *FGCanvasPath::quickItem() const
{
return _quickPath;
}
void FGCanvasPath::doDestroy()
{
delete _quickPath;
}
void FGCanvasPath::markPathDirty()
{
_pathDirty = true;
requestPolish();
}
void FGCanvasPath::markStrokeDirty()
{
_penDirty = true;
requestPolish();
}
bool FGCanvasPath::onChildAdded(LocalProp *prop)
{
if (FGCanvasElement::onChildAdded(prop)) {
return true;
}
if ((prop->name() == "cmd") || (prop->name() == "coord") || (prop->name() == "svg")) {
connect(prop, &LocalProp::valueChanged, this, &FGCanvasPath::markPathDirty);
return true;
}
if (prop->name() == "rect") {
_isRect = true;
connect(prop, &LocalProp::childAdded, this, &FGCanvasPath::onChildAdded);
return true;
}
// handle rect property changes
if (prop->parent()->name() == "rect") {
connect(prop, &LocalProp::valueChanged, this, &FGCanvasPath::markPathDirty);
return true;
}
if (prop->name().startsWith("border-")) {
connect(prop, &LocalProp::valueChanged, this, &FGCanvasPath::markPathDirty);
return true;
}
if ((prop->name() == "cmd-geo") || (prop->name() == "coord-geo")) {
// ignore for now, we let the server-side transform down to cartesian.
// if we move that work to client side we could skip sending the cmd/coord data
return true;
}
if (prop->name().startsWith("stroke")) {
connect(prop, &LocalProp::valueChanged, this, &FGCanvasPath::markStrokeDirty);
return true;
}
qWarning() << "path saw unrecognized child:" << prop->name() << prop->index();
return false;
}
bool FGCanvasPath::onChildRemoved(LocalProp* prop)
{
if (FGCanvasElement::onChildRemoved(prop)) {
return true;
}
const auto name = prop->name();
if (name == "rect") {
_isRect = false;
markPathDirty();
return true;
}
if ((name == "cmd") || (name == "coord") || (name == "svg")) {
markPathDirty();
return true;
}
if ((name == "cmd-geo") || (name == "coord-geo")) {
// ignored
return true;
}
if (name.startsWith("stroke")) {
markStrokeDirty();
return true;
}
return false;
}
typedef enum
{
PathClose = ( 0 << 1),
PathMoveTo = ( 1 << 1),
PathLineTo = ( 2 << 1),
PathHLineTo = ( 3 << 1),
PathVLineTo = ( 4 << 1),
PathQuadTo = ( 5 << 1),
PathCubicTo = ( 6 << 1),
PathSmoothQuadTo = ( 7 << 1),
PathSmoothCubicTo = ( 8 << 1),
PathShortCCWArc = ( 9 << 1),
PathShortCWArc = (10 << 1),
PathLongCCWArc = (11 << 1),
PathLongCWArc = (12 << 1)
} PathCommands;
static const quint8 CoordsPerCommand[] = {
0, /* VG_CLOSE_PATH */
2, /* VG_MOVE_TO */
2, /* VG_LINE_TO */
1, /* VG_HLINE_TO */
1, /* VG_VLINE_TO */
4, /* VG_QUAD_TO */
6, /* VG_CUBIC_TO */
2, /* VG_SQUAD_TO */
4, /* VG_SCUBIC_TO */
5, /* VG_SCCWARC_TO */
5, /* VG_SCWARC_TO */
5, /* VG_LCCWARC_TO */
5 /* VG_LCWARC_TO */
};
void FGCanvasPath::rebuildPath() const
{
std::vector<float> coords;
std::vector<int> commands;
if (_isRect) {
rebuildFromRect(commands, coords);
} else if (_propertyRoot->hasChild("svg")) {
if (!rebuildFromSVGData(commands, coords)) {
qWarning() << "failed to parse SVG path data" << _propertyRoot->value("svg", QVariant());
}
} else {
for (QVariant v : _propertyRoot->valuesOfChildren("coord")) {
coords.push_back(v.toFloat());
}
for (QVariant v : _propertyRoot->valuesOfChildren("cmd")) {
commands.push_back(v.toInt());
}
}
rebuildPathFromCommands(commands, coords);
}
QByteArrayList splitSVGPathData(QByteArray d)
{
QByteArrayList result;
size_t pos = 0;
std::string strData(d.data());
const char* seperators = "\n\r\t ,";
size_t startPos = strData.find_first_not_of(seperators, 0);
for(;;)
{
pos = strData.find_first_of(seperators, startPos);
if (pos == std::string::npos) {
result.push_back(QByteArray::fromStdString(strData.substr(startPos)));
break;
}
result.push_back(QByteArray::fromStdString(strData.substr(startPos, pos - startPos)));
startPos = strData.find_first_not_of(seperators, pos);
if (startPos == std::string::npos) {
break;
}
}
return result;
}
bool hasComplexBorderRadius(const LocalProp* prop)
{
for (auto childProp : prop->children()) {
QByteArray name = childProp->name();
if (!name.startsWith("border-") || !name.endsWith("-radius")) {
continue;
}
if (name != "border-radius") {
return true;
}
} // of child prop iteration
return false;
}
bool FGCanvasPath::rebuildFromRect(std::vector<int>& commands, std::vector<float>& coords) const
{
LocalProp* rectProp = _propertyRoot->getWithPath("rect");
if (hasComplexBorderRadius(_propertyRoot)) {
// build a full path
qWarning() << Q_FUNC_INFO << "implement me";
_paintType = Path;
} else {
float top = rectProp->value("top", 0.0).toFloat();
float left = rectProp->value("left", 0.0).toFloat();
float width = rectProp->value("width", 0.0).toFloat();
float height = rectProp->value("height", 0.0).toFloat();
if (rectProp->hasChild("right")) {
width = rectProp->value("right", 0.0).toFloat() - left;
}
if (rectProp->hasChild("bottom")) {
height = rectProp->value("bottom", 0.0).toFloat() - top;
}
_rect = QRectF(left, top, width, height);
if (_propertyRoot->hasChild("border-radius")) {
// round-rect
float xR = _propertyRoot->value("border-radius", 0.0).toFloat();
float yR = xR;
if (_propertyRoot->hasChild("border-radius[1]")) {
yR = _propertyRoot->value("border-radius[1]", 0.0).toFloat();
}
_roundRectRadius = QSizeF(xR, yR);
_paintType = RoundRect;
} else {
// simple rect
_paintType = Rect;
}
}
return true;
}
bool FGCanvasPath::rebuildFromSVGData(std::vector<int>& commands, std::vector<float>& coords) const
{
QByteArrayList tokens = splitSVGPathData(_propertyRoot->value("svg", QVariant()).toByteArray());
PathCommands currentCommand = PathClose;
bool isRelative = false;
int numCoordsTokens = 0;
const int totalTokens = tokens.size();
for (int index = 0; index < totalTokens; /* no increment */) {
const QByteArray& tk = tokens.at(index);
if ((tk.length() == 1) && std::isalpha(tk.at(0))) {
// new command token
const char svgCommand = std::toupper(tk.at(0));
isRelative = std::islower(tk.at(0));
switch (svgCommand) {
case 'Z':
currentCommand = PathClose;
numCoordsTokens = 0;
break;
case 'M':
currentCommand = PathMoveTo;
numCoordsTokens = 2;
break;
case 'L':
currentCommand = PathLineTo;
numCoordsTokens = 2;
break;
case 'H':
currentCommand = PathHLineTo;
numCoordsTokens = 1;
break;
case 'V':
currentCommand = PathVLineTo;
numCoordsTokens = 1;
break;
case 'C':
currentCommand = PathCubicTo;
numCoordsTokens = 6;
break;
case 'S':
currentCommand = PathSmoothCubicTo;
numCoordsTokens = 4;
break;
case 'Q':
currentCommand = PathQuadTo;
numCoordsTokens = 4;
break;
case 'T':
currentCommand = PathSmoothQuadTo;
numCoordsTokens = 2;
break;
case 'A':
currentCommand = PathShortCWArc;
numCoordsTokens = 0; // handled specially below
break;
default:
qWarning() << "unrecognized SVG command" << svgCommand;
return false;
}
++index;
}
switch (currentCommand) {
case PathMoveTo:
commands.push_back(PathMoveTo | (isRelative ? 1 : 0));
currentCommand = PathLineTo;
break;
case PathClose:
case PathLineTo:
case PathHLineTo:
case PathVLineTo:
case PathQuadTo:
case PathCubicTo:
case PathSmoothQuadTo:
case PathSmoothCubicTo:
commands.push_back(currentCommand | (isRelative ? 1 : 0));
break;
case PathShortCWArc:
case PathShortCCWArc:
case PathLongCWArc:
case PathLongCCWArc:
{
// decode the actual arc type
coords.push_back(tokens.at(index++).toFloat()); // rx
coords.push_back(tokens.at(index++).toFloat()); // ry
coords.push_back(tokens.at(index++).toFloat()); // x-axis rotation
const bool isLargeArc = (tokens.at(index++).toInt() != 0); // large-angle
const bool isCCW = (tokens.at(index++).toInt() != 0); // sweep-flag
if (isLargeArc) {
commands.push_back(isCCW ? PathLongCCWArc : PathLongCWArc);
} else {
commands.push_back(isCCW ? PathShortCCWArc : PathShortCWArc);
}
if (isRelative) {
commands.back() |= 1;
}
coords.push_back(tokens.at(index++).toFloat());
coords.push_back(tokens.at(index++).toFloat());
break;
}
default:
qWarning() << "invalid path command";
return false;
} // of current command switch
// copy over tokens according to the active command.
if (index + numCoordsTokens > totalTokens) {
qWarning() << "insufficent remaining tokens for SVG command" << currentCommand;
qWarning() << index << numCoordsTokens << totalTokens;
return false;
}
for (int c = 0; c < numCoordsTokens; ++c) {
coords.push_back(tokens.at(index + c).toFloat());
}
index += numCoordsTokens;
} // of tokens iteration
return true;
}
void FGCanvasPath::rebuildPathFromCommands(const std::vector<int>& commands, const std::vector<float>& coords) const
{
QPainterPath newPath;
const float* coord = coords.data();
QPointF lastControlPoint; // for smooth cubics / quadric
size_t currentCoord = 0;
for (int cmd : commands) {
bool isRelative = cmd & 0x1;
const int op = cmd & ~0x1;
const int cmdIndex = op >> 1;
const qreal baseX = isRelative ? newPath.currentPosition().x() : 0.0f;
const qreal baseY = isRelative ? newPath.currentPosition().y() : 0.0f;
if ((currentCoord + CoordsPerCommand[cmdIndex]) > coords.size()) {
qWarning() << "insufficient path data" << currentCoord << cmdIndex << CoordsPerCommand[cmdIndex] << coords.size();
break;
}
switch (op) {
case PathClose:
newPath.closeSubpath();
break;
case PathMoveTo:
newPath.moveTo(coord[0] + baseX, coord[1] + baseY);
break;
case PathLineTo:
newPath.lineTo(coord[0] + baseX, coord[1] + baseY);
break;
case PathHLineTo:
newPath.lineTo(coord[0] + baseX, newPath.currentPosition().y());
break;
case PathVLineTo:
newPath.lineTo(newPath.currentPosition().x(), coord[0] + baseY);
break;
case PathQuadTo:
newPath.quadTo(coord[0] + baseX, coord[1] + baseY,
coord[2] + baseX, coord[3] + baseY);
lastControlPoint = QPointF(coord[0] + baseX, coord[1] + baseY);
break;
case PathCubicTo:
newPath.cubicTo(coord[0] + baseX, coord[1] + baseY,
coord[2] + baseX, coord[3] + baseY,
coord[4] + baseX, coord[5] + baseY);
lastControlPoint = QPointF(coord[2] + baseX, coord[3] + baseY);
break;
case PathSmoothQuadTo: {
QPointF smoothControlPoint = (newPath.currentPosition() - lastControlPoint) * 2.0;
newPath.quadTo(smoothControlPoint.x(), smoothControlPoint.y(),
coord[0] + baseX, coord[1] + baseY);
lastControlPoint = smoothControlPoint;
break;
}
case PathSmoothCubicTo: {
QPointF smoothControlPoint = (newPath.currentPosition() - lastControlPoint) * 2.0;
newPath.cubicTo(smoothControlPoint.x(), smoothControlPoint.y(),
coord[0] + baseX, coord[1] + baseY,
coord[2] + baseX, coord[3] + baseY);
lastControlPoint = QPointF(coord[0] + baseX, coord[1] + baseY);
break;
}
#if 0
qreal rx,
qreal ry,
qreal x_axis_rotation,
int large_arc_flag,
int sweep_flag,
qreal x,
qreal y,
qreal curx, qreal cury)
#endif
case PathLongCCWArc:
case PathLongCWArc:
pathArc(newPath, coord[0], coord[1], coord[2],
true, (op == PathLongCCWArc),
coord[3] + baseX, coord[4] + baseY,
newPath.currentPosition().x(), newPath.currentPosition().y());
break;
case PathShortCCWArc:
case PathShortCWArc:
pathArc(newPath, coord[0], coord[1], coord[2],
false, (op == PathShortCCWArc),
coord[3] + baseX, coord[4] + baseY,
newPath.currentPosition().x(), newPath.currentPosition().y());
break;
default:
qWarning() << "uhandled path command type:" << cmdIndex;
}
if ((op < PathQuadTo) || (op > PathSmoothCubicTo)) {
lastControlPoint = newPath.currentPosition();
}
coord += CoordsPerCommand[cmdIndex];
currentCoord += CoordsPerCommand[cmdIndex];
} // of commands iteration
// qDebug() << _propertyRoot->path() << "path" << newPath;
_painterPath = newPath;
}
static Qt::PenCapStyle qtCapFromCanvas(QString s)
{
if (s.isEmpty() || (s == "butt")) {
return Qt::FlatCap;
} else if (s == "round") {
return Qt::RoundCap;
} else if (s == "square") {
return Qt::SquareCap;
} else {
qDebug() << Q_FUNC_INFO << s;
}
return Qt::FlatCap;
}
static Qt::PenJoinStyle qtJoinFromCanvas(QString s)
{
if (s.isEmpty() || (s == "miter")) {
return Qt::MiterJoin;
} else if (s == "round") {
return Qt::RoundJoin;
} else {
qDebug() << Q_FUNC_INFO << s;
}
return Qt::MiterJoin;
}
static QVector<qreal> qtPenDashesFromCanvas(QString s, double penWidth)
{
QVector<qreal> result;
Q_FOREACH(QString v, s.split(',')) {
result.push_back(v.toFloat() / penWidth);
}
// https://developer.mozilla.org/en/docs/Web/SVG/Attribute/stroke-dasharray
// odd number = double it
if ((result.size() % 2) == 1) {
result += result;
}
return result;
}
void FGCanvasPath::rebuildPen() const
{
QPen p;
QVariant strokeColor = getCascadedStyle("stroke");
p.setColor(parseColorValue(strokeColor));
p.setWidthF(getCascadedStyle("stroke-width", 1.0).toFloat());
p.setCapStyle(qtCapFromCanvas(_propertyRoot->value("stroke-linecap", QString()).toString()));
p.setJoinStyle(qtJoinFromCanvas(_propertyRoot->value("stroke-linejoin", QString()).toString()));
QString dashArray = _propertyRoot->value("stroke-dasharray", QVariant()).toString();
if (!dashArray.isEmpty() && (dashArray != "none")) {
p.setDashPattern(qtPenDashesFromCanvas(dashArray, p.widthF()));
}
_stroke = p;
}
#include "fgcanvaspath.moc"
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