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Chenwenxuan
261
actions/rs_actiondrawellipsefocipoint.cpp
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261
actions/rs_actiondrawellipsefocipoint.cpp
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/****************************************************************************
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**
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* Draw ellipse by foci and a point on ellipse
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Copyright (C) 2011 Dongxu Li (dongxuli2011@gmail.com)
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Copyright (C) 2011 R. van Twisk (librecad@rvt.dds.nl)
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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
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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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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**********************************************************************/
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#include "rs_actiondrawellipsefocipoint.h"
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#include<cmath>
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#include <QAction>
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#include <QMouseEvent>
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#include "rs_dialogfactory.h"
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#include "rs_graphicview.h"
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#include "rs_commandevent.h"
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#include "rs_ellipse.h"
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#include "rs_coordinateevent.h"
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#include "rs_math.h"
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#include "rs_preview.h"
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#include "rs_debug.h"
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struct RS_ActionDrawEllipseFociPoint::Points {
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// Foci of ellipse
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RS_Vector focus1,focus2;
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// A point on ellipse
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RS_Vector point;
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RS_Vector center,major;
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double c; //hold half of distance between foci
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double d; //hold half of distance
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};
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/**
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* Constructor.
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*
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*/
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RS_ActionDrawEllipseFociPoint::RS_ActionDrawEllipseFociPoint(
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RS_EntityContainer& container,
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RS_GraphicView& graphicView)
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:RS_PreviewActionInterface("Draw ellipse by foci and a point",
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container, graphicView)
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, pPoints(new Points{})
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{
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actionType=RS2::ActionDrawEllipseFociPoint;
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}
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RS_ActionDrawEllipseFociPoint::~RS_ActionDrawEllipseFociPoint() = default;
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void RS_ActionDrawEllipseFociPoint::init(int status) {
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RS_PreviewActionInterface::init(status);
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if (status==SetFocus1) {
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pPoints->focus1.valid=false;
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}
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}
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double RS_ActionDrawEllipseFociPoint::findRatio() const
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{
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return sqrt(pPoints->d*pPoints->d-pPoints->c*pPoints->c)/pPoints->d;
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}
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void RS_ActionDrawEllipseFociPoint::trigger() {
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RS_PreviewActionInterface::trigger();
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RS_Ellipse* ellipse = new RS_Ellipse{container,
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{pPoints->center,
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pPoints->major*pPoints->d,
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findRatio(),
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0., 0.,false}
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};
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ellipse->setLayerToActive();
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ellipse->setPenToActive();
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container->addEntity(ellipse);
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// upd. undo list:
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if (document) {
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document->startUndoCycle();
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document->addUndoable(ellipse);
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document->endUndoCycle();
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}
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// RS_Vector rz = graphicView->getRelativeZero();
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graphicView->moveRelativeZero(ellipse->getCenter());
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graphicView->redraw(RS2::RedrawDrawing);
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drawSnapper();
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setStatus(SetFocus1);
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RS_DEBUG->print("RS_ActionDrawEllipseFociPoint::trigger():"
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" entity added: %d", ellipse->getId());
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}
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void RS_ActionDrawEllipseFociPoint::mouseMoveEvent(QMouseEvent* e) {
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RS_DEBUG->print("RS_ActionDrawEllipseFociPoint::mouseMoveEvent begin");
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RS_Vector mouse = snapPoint(e);
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switch (getStatus()) {
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case SetPoint:
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pPoints->point=mouse;
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pPoints->d=0.5*(pPoints->focus1.distanceTo(pPoints->point) +
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pPoints->focus2.distanceTo(pPoints->point));
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if (pPoints->d > pPoints->c+ RS_TOLERANCE) {
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deletePreview();
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preview->addEntity(new RS_Ellipse{preview.get(),
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{pPoints->center,
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pPoints->major*pPoints->d,
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findRatio(),
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0., 0.,false}});
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drawPreview();
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}
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break;
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default:
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break;
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}
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RS_DEBUG->print("RS_ActionDrawEllipseFociPoint::mouseMoveEvent end");
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}
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void RS_ActionDrawEllipseFociPoint::mouseReleaseEvent(QMouseEvent* e) {
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// Proceed to next status
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if (e->button()==Qt::LeftButton) {
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RS_CoordinateEvent ce(snapPoint(e));
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coordinateEvent(&ce);
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}
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// Return to last status:
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else if (e->button()==Qt::RightButton) {
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deletePreview();
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init(getStatus()-1);
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}
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}
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void RS_ActionDrawEllipseFociPoint::coordinateEvent(RS_CoordinateEvent* e) {
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if (e==NULL) {
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return;
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}
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RS_Vector mouse = e->getCoordinate();
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switch (getStatus()) {
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case SetFocus1:
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graphicView->moveRelativeZero(mouse);
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pPoints->focus1=mouse;
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setStatus(SetFocus2);
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break;
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case SetFocus2:
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pPoints->c = 0.5*pPoints->focus1.distanceTo(mouse);
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if(pPoints->c > RS_TOLERANCE){
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graphicView->moveRelativeZero(mouse);
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pPoints->focus2=mouse;
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pPoints->center=(pPoints->focus1+pPoints->focus2)*0.5;
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pPoints->major=pPoints->focus1-pPoints->center;
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pPoints->major /= pPoints->c ;
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setStatus(SetPoint);
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}
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break;
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case SetPoint:
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pPoints->point=mouse;
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pPoints->d=0.5*(pPoints->focus1.distanceTo(pPoints->point)+pPoints->focus2.distanceTo(pPoints->point));
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if (pPoints->d > pPoints->c+ RS_TOLERANCE) {
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graphicView->moveRelativeZero(mouse);
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trigger();
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}
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break;
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default:
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break;
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}
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}
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void RS_ActionDrawEllipseFociPoint::commandEvent(RS_CommandEvent* e) {
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QString cmd = e->getCommand().toLower();
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if (checkCommand("help", cmd)) {
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RS_DIALOGFACTORY->commandMessage(msgAvailableCommands()
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+ getAvailableCommands().join(": ")+
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tr("specify a point on ellipse, or total distance to foci")
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);
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e->accept();
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return;
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}
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if(getStatus()==SetPoint){
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bool ok;
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double a = RS_Math::eval(cmd, &ok);
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if (ok) {
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pPoints->d=0.5*fabs(a);
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if (pPoints->d > pPoints->c + RS_TOLERANCE) {
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trigger();
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} else
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RS_DIALOGFACTORY->commandMessage(tr("Total distance %1 is smaller than distance between foci").arg(fabs(a)));
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} else
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RS_DIALOGFACTORY->commandMessage(tr("Not a valid expression"));
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}
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}
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QStringList RS_ActionDrawEllipseFociPoint::getAvailableCommands() {
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QStringList cmd;
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return cmd;
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}
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void RS_ActionDrawEllipseFociPoint::updateMouseButtonHints() {
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switch (getStatus()) {
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case SetFocus1:
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RS_DIALOGFACTORY->updateMouseWidget(tr("Specify first focus of ellipse"),
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tr("Cancel"));
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break;
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case SetFocus2:
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RS_DIALOGFACTORY->updateMouseWidget(tr("Specify second focus of ellipse"),
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tr("Back"));
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break;
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case SetPoint:
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RS_DIALOGFACTORY->updateMouseWidget(
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tr("Specify a point on ellipse or total distance to foci"),
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tr("Back"));
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break;
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default:
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RS_DIALOGFACTORY->updateMouseWidget();
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break;
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}
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}
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void RS_ActionDrawEllipseFociPoint::updateMouseCursor() {
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graphicView->setMouseCursor(RS2::CadCursor);
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}
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// EOF
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