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Chenwenxuan
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lib/gui/rs_painter.cpp
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163
lib/gui/rs_painter.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<cmath>
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#include<QPolygon>
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#include "rs_pen.h"
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#include "rs_color.h"
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#include "rs_painter.h"
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#include "rs_math.h"
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#include "rs_debug.h"
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void RS_Painter::createArc(QPolygon& pa,
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const RS_Vector& cp, double radius,
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double a1, double a2,
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bool reversed) {
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if (radius<1.0e-6) {
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RS_DEBUG->print(RS_Debug::D_WARNING,
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"RS_Painter::createArc: invalid radius: %f", radius);
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return;
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}
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double aStep=fabs(2.0/radius); // Angle Step (rad)
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if(aStep>=0.5) aStep=0.5;
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if(reversed) {
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if(a1<=a2+RS_TOLERANCE) a1+=2.*M_PI;
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aStep *= -1;
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}else{
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if(a2<=a1+RS_TOLERANCE) a2+=2.*M_PI;
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}
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double a; // Current Angle (rad)
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// aStep=aStep/2.0;
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//if (aStep<0.05) {
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// aStep = 0.05;
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//}
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// less than a pixel long lines:
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//if (radius*aStep<1.0) {
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// aStep =
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//}
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//QPointArray pa;
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pa.clear();
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// pa<<QPoint(toScreenX(cp.x+cos(aStart)*radius), toScreenY(cp.y-sin(aStart)*radius));
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double da=fabs(a2-a1);
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for(a=a1; fabs(a-a1)<da; a+=aStep) {
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pa<<QPoint(toScreenX(cp.x+cos(a)*radius), toScreenY(cp.y-sin(a)*radius));
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}
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QPoint pt2(toScreenX(cp.x+cos(a2)*radius), toScreenY(cp.y-sin(a2)*radius));
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if(pa.size()>0 && pa.last() != pt2) pa<<pt2;
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}
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void RS_Painter::createEllipse(QPolygon& pa,
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const RS_Vector& cp,
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double radius1, double radius2,
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double angle,
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double angle1, double angle2,
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bool reversed)
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{
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const RS_Vector vr(radius1,radius2);
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const RS_Vector rvp(radius2,radius1);
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const double ab=radius1*radius2;
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double ea1=angle1;
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double ea2;
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double dA=RS_Math::getAngleDifference(angle1, angle2, reversed);
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if(dA <= RS_TOLERANCE_ANGLE) {
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dA=2.*M_PI;
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ea2 =ea1 + dA;
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}else
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ea2 = ea1 +(reversed?-dA:dA);
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const RS_Vector angleVector(-angle);
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/*
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draw a new line after tangent changes by 0.01 rad
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ds^2 = (a^2 sin^2 + b^2 cos^2) da^2
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*/
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RS_Vector vp(-ea1);
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vp.scale(vr);
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vp.rotate(angleVector);
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vp.move(cp);
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// vp.set(cp.x+cos(a1)*radius1,
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// cp.y-sin(a1)*radius2);
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// vp.rotate(vc, -angle);
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pa.clear();
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// pa<<QPoint(toScreenX(vp.x),
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// toScreenY(vp.y));
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// moveTo(toScreenX(vp.x),
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// toScreenY(vp.y));
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const double minDea=fabs(ea2-ea1)/2048.;
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// Arc Counterclockwise:
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do {
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RS_Vector va(-ea1);
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vp=va;
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double r2=va.scale(rvp).squared();
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if( r2<RS_TOLERANCE15) r2=RS_TOLERANCE15;
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double aStep=ab/(r2*sqrt(r2));
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if(aStep < minDea) aStep=minDea;
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if(aStep > M_PI/4.) aStep=M_PI/4.;
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ea1 += reversed?-aStep:aStep;
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vp.scale(vr);
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vp.rotate(angleVector);
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vp.move(cp);
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pa<<QPoint(toScreenX(vp.x),
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toScreenY(vp.y));
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} while(fabs(angle1-ea1)<dA);
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vp.set(cos(ea2)*radius1,
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-sin(ea2)*radius2);
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vp.rotate(angleVector);
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vp.move(cp);
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pa<<QPoint(toScreenX(vp.x),
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toScreenY(vp.y));
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}
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void RS_Painter::drawRect(const RS_Vector& p1, const RS_Vector& p2) {
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drawPolygon(QRect(int(p1.x+0.5), int(p1.y+0.5), int(p2.x - p1.x+0.5), int(p2.y - p1.y+0.5)));
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// drawLine(RS_Vector(p1.x, p1.y), RS_Vector(p2.x, p1.y));
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// drawLine(RS_Vector(p2.x, p1.y), RS_Vector(p2.x, p2.y));
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// drawLine(RS_Vector(p2.x, p2.y), RS_Vector(p1.x, p2.y));
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// drawLine(RS_Vector(p1.x, p2.y), RS_Vector(p1.x, p1.y));
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}
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void RS_Painter::drawHandle(const RS_Vector& p, const RS_Color& c, int size) {
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if (size<0) {
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size = 2;
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}
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fillRect((int)(p.x-size), (int)(p.y-size), 2*size, 2*size, c);
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}
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int RS_Painter::toScreenX(double x) const {
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return RS_Math::round(offset.x + x);
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}
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int RS_Painter::toScreenY(double y) const{
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return RS_Math::round(offset.y + y);
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}
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