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Chenwenxuan
256
actions/lc_actiondrawcircle2pr.cpp
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256
actions/lc_actiondrawcircle2pr.cpp
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/****************************************************************************
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*
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This file is part of the LibreCAD project, a 2D CAD program
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Copyright (C) 2014-2015 Dongxu Li (dongxuli2011 at gmail.com)
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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<cmath>
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#include <QAction>
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#include <QMouseEvent>
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#include "lc_actiondrawcircle2pr.h"
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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_circle.h"
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#include "rs_point.h"
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#include "rs_coordinateevent.h"
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#include "rs_preview.h"
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struct LC_ActionDrawCircle2PR::Points
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{
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RS_Vector point1;
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RS_Vector point2;
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};
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LC_ActionDrawCircle2PR::LC_ActionDrawCircle2PR(RS_EntityContainer& container,
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RS_GraphicView& graphicView)
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:RS_ActionDrawCircleCR(container, graphicView)
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,pPoints(new Points{})
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{
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actionType=RS2::ActionDrawCircle2PR;
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reset();
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}
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LC_ActionDrawCircle2PR::~LC_ActionDrawCircle2PR() = default;
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void LC_ActionDrawCircle2PR::reset() {
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deletePreview();
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*data = {};
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pPoints->point1 = {};
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pPoints->point2 = {};
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}
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void LC_ActionDrawCircle2PR::init(int status) {
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RS_PreviewActionInterface::init(status);
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reset();
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}
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void LC_ActionDrawCircle2PR::trigger() {
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RS_PreviewActionInterface::trigger();
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RS_Circle* circle = new RS_Circle(container,
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*data);
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circle->setLayerToActive();
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circle->setPenToActive();
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container->addEntity(circle);
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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(circle);
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document->endUndoCycle();
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}
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RS_Vector rz = graphicView->getRelativeZero();
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graphicView->redraw(RS2::RedrawDrawing);
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graphicView->moveRelativeZero(rz);
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drawSnapper();
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setStatus(SetPoint1);
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reset();
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}
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bool LC_ActionDrawCircle2PR::preparePreview(const RS_Vector& mouse) {
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const RS_Vector vp=(pPoints->point1 + pPoints->point2)*0.5;
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double const angle=pPoints->point1.angleTo(pPoints->point2) + 0.5*M_PI;
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double const& r0=data->radius;
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double const r=sqrt(r0*r0-0.25*pPoints->point1.squaredTo(pPoints->point2));
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const RS_Vector dvp=RS_Vector(angle)*r;
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const RS_Vector& center1= vp + dvp;
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const RS_Vector& center2= vp - dvp;
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if( center1.squaredTo(center2) < RS_TOLERANCE ) {
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//no need to select center, as only one solution possible
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data->center=vp;
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return false;
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}
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const double ds=mouse.squaredTo(center1) - mouse.squaredTo(center2);
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if (ds < 0. ){
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data->center=center1;
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return true;
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}
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if (ds > 0. ){
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data->center=center2;
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return true;
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}
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data->center.valid=false;
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return false;
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}
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void LC_ActionDrawCircle2PR::mouseMoveEvent(QMouseEvent* e) {
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RS_Vector mouse = snapPoint(e);
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switch (getStatus()) {
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case SetPoint1:
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pPoints->point1 = mouse;
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break;
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case SetPoint2:
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if(mouse.distanceTo(pPoints->point1) <= 2.*data->radius) pPoints->point2 = mouse;
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break;
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case SelectCenter: {
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if(preparePreview(mouse)){
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bool existing=false;
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for(auto p: *preview){
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if(p->rtti() == RS2::EntityCircle){
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if( static_cast<RS_Circle*>(p)->getData() == *data)
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existing=true;
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}
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}
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if(!existing){
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deletePreview();
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preview->addEntity(new RS_Point(preview.get(), RS_PointData(data->center)));
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RS_Circle* circle = new RS_Circle(preview.get(), *data);
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preview->addEntity(circle);
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drawPreview();
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}
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}else{
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if(data->isValid()) trigger();
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}
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}
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}
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}
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void LC_ActionDrawCircle2PR::mouseReleaseEvent(QMouseEvent* e) {
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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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} 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 LC_ActionDrawCircle2PR::coordinateEvent(RS_CoordinateEvent* e) {
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if (!e) return;
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RS_Vector mouse = e->getCoordinate();
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switch (getStatus()) {
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case SetPoint1:
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pPoints->point1 = mouse;
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graphicView->moveRelativeZero(mouse);
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setStatus(SetPoint2);
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break;
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case SetPoint2:
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if(mouse.distanceTo(pPoints->point1) <= 2.*data->radius){
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pPoints->point2 = mouse;
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graphicView->moveRelativeZero(mouse);
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setStatus(SelectCenter);
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}else{
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RS_DIALOGFACTORY->commandMessage(tr("radius=%1 is too small for points selected\ndistance between points=%2 is larger than diameter=%3").
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arg(data->radius).arg(pPoints->point1.distanceTo(pPoints->point2)).arg(2.*data->radius));
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}
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break;
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case SelectCenter: {
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bool showPreview=preparePreview(mouse);
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if(showPreview || data->isValid())
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trigger();
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else
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RS_DIALOGFACTORY->commandMessage(tr("Select from two possible circle centers"));
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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 LC_ActionDrawCircle2PR::commandEvent(RS_CommandEvent* e) {
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QString c = e->getCommand().toLower();
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if (checkCommand("help", c)) {
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RS_DIALOGFACTORY->commandMessage(msgAvailableCommands()
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+ getAvailableCommands().join(", "));
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return;
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}
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}
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QStringList LC_ActionDrawCircle2PR::getAvailableCommands() {
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QStringList cmd;
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return cmd;
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}
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void LC_ActionDrawCircle2PR::updateMouseButtonHints() {
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switch (getStatus()) {
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case SetPoint1:
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RS_DIALOGFACTORY->updateMouseWidget(tr("Specify first point"),
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tr("Cancel"));
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break;
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case SetPoint2:
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RS_DIALOGFACTORY->updateMouseWidget(tr("Specify second point"),
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tr("Back"));
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break;
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case SelectCenter:
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RS_DIALOGFACTORY->updateMouseWidget(tr("Select circle center"),
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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 LC_ActionDrawCircle2PR::updateMouseCursor() {
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graphicView->setMouseCursor(RS2::CadCursor);
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}
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// EOF
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