695 lines
22 KiB
C++
695 lines
22 KiB
C++
#include "fgcanvaspath.h"
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#include <cctype>
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#include <QByteArrayList>
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#include <QPainter>
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#include <QDebug>
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#include <QtMath>
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#include "fgcanvaspaintcontext.h"
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#include "localprop.h"
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static void pathArcSegment(QPainterPath &path,
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qreal xc, qreal yc,
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qreal th0, qreal th1,
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qreal rx, qreal ry, qreal xAxisRotation)
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{
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qreal sinTh, cosTh;
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qreal a00, a01, a10, a11;
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qreal x1, y1, x2, y2, x3, y3;
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qreal t;
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qreal thHalf;
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sinTh = qSin(xAxisRotation * (M_PI / 180.0));
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cosTh = qCos(xAxisRotation * (M_PI / 180.0));
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a00 = cosTh * rx;
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a01 = -sinTh * ry;
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a10 = sinTh * rx;
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a11 = cosTh * ry;
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thHalf = 0.5 * (th1 - th0);
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t = (8.0 / 3.0) * qSin(thHalf * 0.5) * qSin(thHalf * 0.5) / qSin(thHalf);
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x1 = xc + qCos(th0) - t * qSin(th0);
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y1 = yc + qSin(th0) + t * qCos(th0);
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x3 = xc + qCos(th1);
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y3 = yc + qSin(th1);
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x2 = x3 + t * qSin(th1);
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y2 = y3 - t * qCos(th1);
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path.cubicTo(a00 * x1 + a01 * y1, a10 * x1 + a11 * y1,
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a00 * x2 + a01 * y2, a10 * x2 + a11 * y2,
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a00 * x3 + a01 * y3, a10 * x3 + a11 * y3);
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}
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// the arc handling code underneath is from XSVG (BSD license)
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/*
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* Copyright 2002 USC/Information Sciences Institute
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*
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* Permission to use, copy, modify, distribute, and sell this software
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* and its documentation for any purpose is hereby granted without
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* fee, provided that the above copyright notice appear in all copies
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* and that both that copyright notice and this permission notice
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* appear in supporting documentation, and that the name of
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* Information Sciences Institute not be used in advertising or
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* publicity pertaining to distribution of the software without
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* specific, written prior permission. Information Sciences Institute
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* makes no representations about the suitability of this software for
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* any purpose. It is provided "as is" without express or implied
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* warranty.
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*
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* INFORMATION SCIENCES INSTITUTE DISCLAIMS ALL WARRANTIES WITH REGARD
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* TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL INFORMATION SCIENCES
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* INSTITUTE BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA
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* OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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static void pathArc(QPainterPath &path,
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qreal rx,
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qreal ry,
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qreal x_axis_rotation,
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int large_arc_flag,
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int sweep_flag,
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qreal x,
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qreal y,
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qreal curx, qreal cury)
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{
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qreal sin_th, cos_th;
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qreal a00, a01, a10, a11;
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qreal x0, y0, x1, y1, xc, yc;
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qreal d, sfactor, sfactor_sq;
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qreal th0, th1, th_arc;
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int i, n_segs;
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qreal dx, dy, dx1, dy1, Pr1, Pr2, Px, Py, check;
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rx = qAbs(rx);
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ry = qAbs(ry);
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sin_th = qSin(x_axis_rotation * (M_PI / 180.0));
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cos_th = qCos(x_axis_rotation * (M_PI / 180.0));
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dx = (curx - x) / 2.0;
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dy = (cury - y) / 2.0;
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dx1 = cos_th * dx + sin_th * dy;
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dy1 = -sin_th * dx + cos_th * dy;
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Pr1 = rx * rx;
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Pr2 = ry * ry;
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Px = dx1 * dx1;
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Py = dy1 * dy1;
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/* Spec : check if radii are large enough */
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check = Px / Pr1 + Py / Pr2;
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if (check > 1) {
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rx = rx * qSqrt(check);
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ry = ry * qSqrt(check);
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}
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a00 = cos_th / rx;
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a01 = sin_th / rx;
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a10 = -sin_th / ry;
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a11 = cos_th / ry;
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x0 = a00 * curx + a01 * cury;
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y0 = a10 * curx + a11 * cury;
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x1 = a00 * x + a01 * y;
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y1 = a10 * x + a11 * y;
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/* (x0, y0) is current point in transformed coordinate space.
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(x1, y1) is new point in transformed coordinate space.
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The arc fits a unit-radius circle in this space.
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*/
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d = (x1 - x0) * (x1 - x0) + (y1 - y0) * (y1 - y0);
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sfactor_sq = 1.0 / d - 0.25;
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if (sfactor_sq < 0) sfactor_sq = 0;
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sfactor = qSqrt(sfactor_sq);
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if (sweep_flag == large_arc_flag) sfactor = -sfactor;
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xc = 0.5 * (x0 + x1) - sfactor * (y1 - y0);
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yc = 0.5 * (y0 + y1) + sfactor * (x1 - x0);
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/* (xc, yc) is center of the circle. */
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th0 = qAtan2(y0 - yc, x0 - xc);
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th1 = qAtan2(y1 - yc, x1 - xc);
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th_arc = th1 - th0;
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if (th_arc < 0 && sweep_flag)
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th_arc += 2 * M_PI;
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else if (th_arc > 0 && !sweep_flag)
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th_arc -= 2 * M_PI;
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n_segs = qCeil(qAbs(th_arc / (M_PI * 0.5 + 0.001)));
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for (i = 0; i < n_segs; i++) {
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pathArcSegment(path, xc, yc,
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th0 + i * th_arc / n_segs,
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th0 + (i + 1) * th_arc / n_segs,
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rx, ry, x_axis_rotation);
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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FGCanvasPath::FGCanvasPath(FGCanvasGroup* pr, LocalProp* prop) :
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FGCanvasElement(pr, prop)
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{
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}
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void FGCanvasPath::doPaint(FGCanvasPaintContext *context) const
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{
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if (_pathDirty) {
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rebuildPath();
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_pathDirty = false;
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}
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if (_penDirty) {
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rebuildPen();
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_penDirty = false;
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}
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context->painter()->setPen(_stroke);
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switch (_paintType) {
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case Rect:
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context->painter()->drawRect(_rect);
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break;
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case RoundRect:
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context->painter()->drawRoundRect(_rect, _roundRectRadius.width(), _roundRectRadius.height());
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break;
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case Path:
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context->painter()->drawPath(_painterPath);
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break;
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}
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if (isHighlighted()) {
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context->painter()->setPen(QPen(Qt::red, 1));
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context->painter()->setBrush(Qt::NoBrush);
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switch (_paintType) {
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case Rect:
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case RoundRect:
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context->painter()->drawRect(_rect);
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break;
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case Path:
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context->painter()->drawRect(_painterPath.boundingRect());
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break;
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}
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}
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}
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void FGCanvasPath::markStyleDirty()
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{
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_penDirty = true;
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}
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void FGCanvasPath::markPathDirty()
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{
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_pathDirty = true;
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}
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void FGCanvasPath::markStrokeDirty()
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{
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_penDirty = true;
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}
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bool FGCanvasPath::onChildAdded(LocalProp *prop)
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{
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if (FGCanvasElement::onChildAdded(prop)) {
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return true;
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}
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if ((prop->name() == "cmd") || (prop->name() == "coord") || (prop->name() == "svg")) {
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connect(prop, &LocalProp::valueChanged, this, &FGCanvasPath::markPathDirty);
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return true;
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}
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if (prop->name() == "rect") {
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_isRect = true;
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connect(prop, &LocalProp::childAdded, this, &FGCanvasPath::onChildAdded);
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return true;
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}
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// handle rect property changes
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if (prop->parent()->name() == "rect") {
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connect(prop, &LocalProp::valueChanged, this, &FGCanvasPath::markPathDirty);
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return true;
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}
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if (prop->name().startsWith("border-")) {
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connect(prop, &LocalProp::valueChanged, this, &FGCanvasPath::markPathDirty);
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return true;
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}
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if ((prop->name() == "cmd-geo") || (prop->name() == "coord-geo")) {
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// ignore for now, we let the server-side transform down to cartesian.
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// if we move that work to client side we could skip sending the cmd/coord data
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return true;
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}
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if (prop->name().startsWith("stroke")) {
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connect(prop, &LocalProp::valueChanged, this, &FGCanvasPath::markStrokeDirty);
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return true;
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}
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qDebug() << "path saw child:" << prop->name() << prop->index();
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return false;
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}
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typedef enum
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{
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PathClose = ( 0 << 1),
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PathMoveTo = ( 1 << 1),
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PathLineTo = ( 2 << 1),
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PathHLineTo = ( 3 << 1),
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PathVLineTo = ( 4 << 1),
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PathQuadTo = ( 5 << 1),
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PathCubicTo = ( 6 << 1),
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PathSmoothQuadTo = ( 7 << 1),
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PathSmoothCubicTo = ( 8 << 1),
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PathShortCCWArc = ( 9 << 1),
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PathShortCWArc = (10 << 1),
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PathLongCCWArc = (11 << 1),
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PathLongCWArc = (12 << 1)
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} PathCommands;
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static const quint8 CoordsPerCommand[] = {
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0, /* VG_CLOSE_PATH */
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2, /* VG_MOVE_TO */
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2, /* VG_LINE_TO */
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1, /* VG_HLINE_TO */
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1, /* VG_VLINE_TO */
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4, /* VG_QUAD_TO */
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6, /* VG_CUBIC_TO */
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2, /* VG_SQUAD_TO */
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4, /* VG_SCUBIC_TO */
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5, /* VG_SCCWARC_TO */
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5, /* VG_SCWARC_TO */
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5, /* VG_LCCWARC_TO */
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5 /* VG_LCWARC_TO */
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};
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void FGCanvasPath::rebuildPath() const
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{
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std::vector<float> coords;
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std::vector<int> commands;
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if (_isRect) {
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rebuildFromRect(commands, coords);
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} else if (_propertyRoot->hasChild("svg")) {
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if (!rebuildFromSVGData(commands, coords)) {
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qWarning() << "failed to parse SVG path data" << _propertyRoot->value("svg", QVariant());
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}
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} else {
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for (QVariant v : _propertyRoot->valuesOfChildren("coord")) {
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coords.push_back(v.toFloat());
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}
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for (QVariant v : _propertyRoot->valuesOfChildren("cmd")) {
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commands.push_back(v.toInt());
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}
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}
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rebuildPathFromCommands(commands, coords);
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}
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QByteArrayList splitSVGPathData(QByteArray d)
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{
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QByteArrayList result;
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size_t pos = 0;
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std::string strData(d.data());
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const char* seperators = "\n\r\t ,";
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size_t startPos = strData.find_first_not_of(seperators, 0);
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for(;;)
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{
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pos = strData.find_first_of(seperators, startPos);
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if (pos == std::string::npos) {
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result.push_back(QByteArray::fromStdString(strData.substr(startPos)));
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break;
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}
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result.push_back(QByteArray::fromStdString(strData.substr(startPos, pos - startPos)));
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startPos = strData.find_first_not_of(seperators, pos);
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if (startPos == std::string::npos) {
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break;
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}
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}
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return result;
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}
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bool hasComplexBorderRadius(const LocalProp* prop)
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{
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for (auto childProp : prop->children()) {
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QByteArray name = childProp->name();
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if (!name.startsWith("border-") || !name.endsWith("-radius")) {
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continue;
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}
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if (name != "border-radius") {
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return true;
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}
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} // of child prop iteration
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return false;
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}
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bool FGCanvasPath::rebuildFromRect(std::vector<int>& commands, std::vector<float>& coords) const
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{
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LocalProp* rectProp = _propertyRoot->getWithPath("rect");
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if (hasComplexBorderRadius(_propertyRoot)) {
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// build a full path
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qWarning() << Q_FUNC_INFO << "implement me";
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_paintType = Path;
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} else {
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float top = rectProp->value("top", 0.0).toFloat();
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float left = rectProp->value("left", 0.0).toFloat();
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float width = rectProp->value("width", 0.0).toFloat();
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float height = rectProp->value("height", 0.0).toFloat();
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if (rectProp->hasChild("right")) {
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width = rectProp->value("right", 0.0).toFloat() - left;
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}
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if (rectProp->hasChild("bottom")) {
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height = rectProp->value("bottom", 0.0).toFloat() - top;
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}
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_rect = QRectF(left, top, width, height);
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if (_propertyRoot->hasChild("border-radius")) {
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// round-rect
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float xR = _propertyRoot->value("border-radius", 0.0).toFloat();
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float yR = xR;
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if (_propertyRoot->hasChild("border-radius[1]")) {
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yR = _propertyRoot->value("border-radius[1]", 0.0).toFloat();
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}
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_roundRectRadius = QSizeF(xR, yR);
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_paintType = RoundRect;
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} else {
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// simple rect
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_paintType = Rect;
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}
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}
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return true;
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}
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bool FGCanvasPath::rebuildFromSVGData(std::vector<int>& commands, std::vector<float>& coords) const
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{
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QByteArrayList tokens = splitSVGPathData(_propertyRoot->value("svg", QVariant()).toByteArray());
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PathCommands currentCommand = PathClose;
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bool isRelative = false;
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int numCoordsTokens = 0;
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const int totalTokens = tokens.size();
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for (int index = 0; index < totalTokens; /* no increment */) {
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const QByteArray& tk = tokens.at(index);
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if ((tk.length() == 1) && std::isalpha(tk.at(0))) {
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// new command token
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const char svgCommand = std::toupper(tk.at(0));
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isRelative = std::islower(tk.at(0));
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switch (svgCommand) {
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case 'Z':
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currentCommand = PathClose;
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numCoordsTokens = 0;
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break;
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case 'M':
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currentCommand = PathMoveTo;
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numCoordsTokens = 2;
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break;
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case 'L':
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currentCommand = PathLineTo;
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numCoordsTokens = 2;
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break;
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case 'H':
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currentCommand = PathHLineTo;
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numCoordsTokens = 1;
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break;
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case 'V':
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currentCommand = PathVLineTo;
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numCoordsTokens = 1;
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break;
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case 'C':
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currentCommand = PathCubicTo;
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numCoordsTokens = 6;
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break;
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case 'S':
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currentCommand = PathSmoothCubicTo;
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numCoordsTokens = 4;
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break;
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case 'Q':
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currentCommand = PathQuadTo;
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numCoordsTokens = 4;
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break;
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case 'T':
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currentCommand = PathSmoothQuadTo;
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numCoordsTokens = 2;
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break;
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case 'A':
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currentCommand = PathShortCWArc;
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numCoordsTokens = 0; // handled specially below
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break;
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default:
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qWarning() << "unrecognized SVG command" << svgCommand;
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return false;
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}
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++index;
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}
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switch (currentCommand) {
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case PathMoveTo:
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commands.push_back(PathMoveTo | (isRelative ? 1 : 0));
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currentCommand = PathLineTo;
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break;
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case PathClose:
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case PathLineTo:
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case PathHLineTo:
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case PathVLineTo:
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case PathQuadTo:
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case PathCubicTo:
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case PathSmoothQuadTo:
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case PathSmoothCubicTo:
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commands.push_back(currentCommand | (isRelative ? 1 : 0));
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break;
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case PathShortCWArc:
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case PathShortCCWArc:
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case PathLongCWArc:
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case PathLongCCWArc:
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{
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// decode the actual arc type
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coords.push_back(tokens.at(index++).toFloat()); // rx
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coords.push_back(tokens.at(index++).toFloat()); // ry
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coords.push_back(tokens.at(index++).toFloat()); // x-axis rotation
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const bool isLargeArc = (tokens.at(index++).toInt() != 0); // large-angle
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const bool isCCW = (tokens.at(index++).toInt() != 0); // sweep-flag
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if (isLargeArc) {
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commands.push_back(isCCW ? PathLongCCWArc : PathLongCWArc);
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} else {
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commands.push_back(isCCW ? PathShortCCWArc : PathShortCWArc);
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}
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if (isRelative) {
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commands.back() |= 1;
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}
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coords.push_back(tokens.at(index++).toFloat());
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coords.push_back(tokens.at(index++).toFloat());
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break;
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}
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default:
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qWarning() << "invalid path command";
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return false;
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} // of current command switch
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// copy over tokens according to the active command.
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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 float baseX = isRelative ? newPath.currentPosition().x() : 0.0f;
|
|
const float 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;
|
|
}
|