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Chenwenxuan
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lib/engine/rs_constructionline.cpp
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286
lib/engine/rs_constructionline.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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**
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** Copyright (C) 2010 R. van Twisk (librecad@rvt.dds.nl)
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** Copyright (C) 2001-2003 RibbonSoft. All rights reserved.
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**
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**
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** This file may be distributed and/or modified under the terms of the
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** GNU General Public License version 2 as published by the Free Software
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** Foundation and appearing in the file gpl-2.0.txt included in the
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** packaging of this file.
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**
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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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**
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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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** This copyright notice MUST APPEAR in all copies of the script!
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**
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**********************************************************************/
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#include "rs_constructionline.h"
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#include "rs_debug.h"
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#include "lc_quadratic.h"
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#include "rs_math.h"
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RS_ConstructionLineData::RS_ConstructionLineData():
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point1(false),
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point2(false)
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{}
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RS_ConstructionLineData::RS_ConstructionLineData(const RS_Vector& point1,
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const RS_Vector& point2):
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point1(point1)
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,point2(point2)
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{
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}
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std::ostream& operator << (std::ostream& os,
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const RS_ConstructionLineData& ld)
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{
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os << "(" << ld.point1 <<
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"/" << ld.point2 <<
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")";
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return os;
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}
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/**
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* Constructor.
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*/
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RS_ConstructionLine::RS_ConstructionLine(RS_EntityContainer* parent,
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const RS_ConstructionLineData& d)
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:RS_AtomicEntity(parent), data(d) {
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calculateBorders();
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}
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RS_Entity* RS_ConstructionLine::clone() const {
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RS_ConstructionLine* c = new RS_ConstructionLine(*this);
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c->initId();
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return c;
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}
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void RS_ConstructionLine::calculateBorders() {
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minV = RS_Vector::minimum(data.point1, data.point2);
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maxV = RS_Vector::maximum(data.point1, data.point2);
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}
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RS_Vector RS_ConstructionLine::getNearestEndpoint(const RS_Vector& coord,
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double* dist) const{
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double dist1, dist2;
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dist1 = (data.point1-coord).squared();
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dist2 = (data.point2-coord).squared();
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if (dist2<dist1) {
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if (dist) {
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*dist = sqrt(dist2);
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}
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return data.point2;
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} else {
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if (dist) {
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*dist = sqrt(dist1);
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}
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return data.point1;
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}
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}
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RS_Vector RS_ConstructionLine::getNearestPointOnEntity(const RS_Vector& coord,
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bool /*onEntity*/, double* /*dist*/, RS_Entity** entity) const{
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if (entity) {
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*entity = const_cast<RS_ConstructionLine*>(this);
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}
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RS_Vector ae = data.point2-data.point1;
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RS_Vector ea = data.point1-data.point2;
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RS_Vector ap = coord-data.point1;
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// RS_Vector ep = coord-data.point2;
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if (ae.magnitude()<1.0e-6 || ea.magnitude()<1.0e-6) {
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return RS_Vector(false);
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}
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// Orthogonal projection from both sides:
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RS_Vector ba = ae * RS_Vector::dotP(ae, ap)
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/ (ae.magnitude()*ae.magnitude());
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// RS_Vector be = ea * RS_Vector::dotP(ea, ep)
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// / (ea.magnitude()*ea.magnitude());
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return data.point1+ba;
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}
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RS_Vector RS_ConstructionLine::getNearestCenter(const RS_Vector& /*coord*/,
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double* dist) const{
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if (dist) {
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*dist = RS_MAXDOUBLE;
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}
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return RS_Vector(false);
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}
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/** @return Copy of data that defines the line. */
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RS_ConstructionLineData const& RS_ConstructionLine::getData() const {
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return data;
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}
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/** @return First definition point. */
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RS_Vector const& RS_ConstructionLine::getPoint1() const {
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return data.point1;
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}
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/** @return Second definition point. */
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RS_Vector const& RS_ConstructionLine::getPoint2() const {
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return data.point2;
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}
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/** @return Start point of the entity */
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RS_Vector RS_ConstructionLine::getStartpoint() const
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{
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return data.point1;
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}
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/** @return End point of the entity */
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RS_Vector RS_ConstructionLine::getEndpoint() const
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{
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return data.point2;
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}
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/**
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* @return Direction 1. The angle at which the arc starts at
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* the startpoint.
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*/
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double RS_ConstructionLine::getDirection1(void) const
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{
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return RS_Math::correctAngle( data.point1.angleTo( data.point2));
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}
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/**
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* @return Direction 2. The angle at which the arc starts at
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* the endpoint.
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*/
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double RS_ConstructionLine::getDirection2(void) const
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{
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return RS_Math::correctAngle( data.point2.angleTo( data.point1));
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}
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/** return the equation of the entity
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for quadratic,
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return a vector contains:
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m0 x^2 + m1 xy + m2 y^2 + m3 x + m4 y + m5 =0
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for linear:
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m0 x + m1 y + m2 =0
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**/
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LC_Quadratic RS_ConstructionLine::getQuadratic() const
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{
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std::vector<double> ce(3,0.);
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auto dvp=data.point2 - data.point1;
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RS_Vector normal(-dvp.y,dvp.x);
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ce[0]=normal.x;
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ce[1]=normal.y;
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ce[2]= -normal.dotP(data.point2);
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return LC_Quadratic(ce);
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}
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RS_Vector RS_ConstructionLine::getMiddlePoint() const{
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return RS_Vector(false);
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}
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RS_Vector RS_ConstructionLine::getNearestMiddle(const RS_Vector& /*coord*/,
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double* dist, const int /*middlePoints*/)const {
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if (dist) {
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*dist = RS_MAXDOUBLE;
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}
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return RS_Vector(false);
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}
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RS_Vector RS_ConstructionLine::getNearestDist(double /*distance*/,
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const RS_Vector& /*coord*/,
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double* dist) const{
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if (dist) {
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*dist = RS_MAXDOUBLE;
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}
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return RS_Vector(false);
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}
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double RS_ConstructionLine::getDistanceToPoint(const RS_Vector& coord,
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RS_Entity** entity,
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RS2::ResolveLevel /*level*/, double /*solidDist*/) const {
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RS_DEBUG->print("RS_ConstructionLine::getDistanceToPoint");
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if (entity) {
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*entity = const_cast<RS_ConstructionLine*>(this);
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}
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//double dist = RS_MAXDOUBLE;
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RS_Vector se = data.point2-data.point1;
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double d(se.magnitude());
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if(d<RS_TOLERANCE) {
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//line too short
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return RS_MAXDOUBLE;
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}
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se.set( se.x/d,-se.y/d); //normalized
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RS_Vector vpc= coord - data.point1;
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vpc.rotate(se); // rotate to use the line as x-axis, and the distance is fabs(y)
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return ( fabs(vpc.y) );
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}
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void RS_ConstructionLine::move(const RS_Vector& offset) {
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data.point1.move(offset);
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data.point2.move(offset);
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//calculateBorders();
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}
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void RS_ConstructionLine::rotate(const RS_Vector& center, const double& angle) {
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RS_Vector angleVector(angle);
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data.point1.rotate(center, angleVector);
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data.point2.rotate(center, angleVector);
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//calculateBorders();
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}
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void RS_ConstructionLine::rotate(const RS_Vector& center, const RS_Vector& angleVector) {
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data.point1.rotate(center, angleVector);
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data.point2.rotate(center, angleVector);
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//calculateBorders();
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}
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void RS_ConstructionLine::scale(const RS_Vector& center, const RS_Vector& factor) {
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data.point1.scale(center, factor);
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data.point2.scale(center, factor);
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//calculateBorders();
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}
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void RS_ConstructionLine::mirror(const RS_Vector& axisPoint1, const RS_Vector& axisPoint2) {
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data.point1.mirror(axisPoint1, axisPoint2);
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data.point2.mirror(axisPoint1, axisPoint2);
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}
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/**
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* Dumps the point's data to stdout.
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*/
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std::ostream& operator << (std::ostream& os, const RS_ConstructionLine& l) {
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os << " ConstructionLine: " << l.getData() << "\n";
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return os;
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}
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