GLHelper.cpp

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/****************************************************************************/
// Some methods which help to draw certain geometrical objects in openGL
/****************************************************************************/
// SUMO, Simulation of Urban MObility; see http://sumo.sourceforge.net/
// Copyright (C) 2001-2011 DLR (http://www.dlr.de/) and contributors
/****************************************************************************/
//
//   This program is free software; you can redistribute it and/or modify
//   it under the terms of the GNU General Public License as published by
//   the Free Software Foundation; either version 2 of the License, or
//   (at your option) any later version.
//
/****************************************************************************/


// ===========================================================================
// included modules
// ===========================================================================
#ifdef _MSC_VER
#include <windows_config.h>
#else
#include <config.h>
#endif

#ifdef _WIN32
#include <windows.h>
#endif

#include <GL/gl.h>

#include "GLHelper.h"
#include <utils/geom/GeomHelper.h>
#include <utils/common/StdDefs.h>
#include <foreign/polyfonts/polyfonts.h>

#ifdef CHECK_MEMORY_LEAKS
#include <foreign/nvwa/debug_new.h>
#endif // CHECK_MEMORY_LEAKS


// ===========================================================================
// static member definitions
// ===========================================================================
std::vector<std::pair<SUMOReal, SUMOReal> > GLHelper::myCircleCoords;


// ===========================================================================
// method definitions
// ===========================================================================
void
GLHelper::drawFilledPoly(const PositionVector& v, bool close) throw() {
    if (v.size()==0) {
        return;
    }
    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
    glBegin(GL_POLYGON);
    const PositionVector::ContType& l = v.getCont();
    for (PositionVector::ContType ::const_iterator i=l.begin(); i!=l.end(); i++) {
        const Position& p = *i;
        glVertex2d(p.x(), p.y());
    }
    if (close) {
        const Position& p = *(l.begin());
        glVertex2d(p.x(), p.y());
    }
    glEnd();
}


void
GLHelper::drawBoxLine(const Position& beg, SUMOReal rot, SUMOReal visLength,
                      SUMOReal width) throw() {
    glPushMatrix();
    glTranslated(beg.x(), beg.y(), 0);
    glRotated(rot, 0, 0, 1);
    glBegin(GL_QUADS);
    glVertex2d(-width, 0);
    glVertex2d(-width, -visLength);
    glVertex2d(width, -visLength);
    glVertex2d(width, 0);
    glEnd();
    glPopMatrix();
}


void
GLHelper::drawBoxLine(const Position& beg1, const Position& beg2,
                      SUMOReal rot, SUMOReal visLength,
                      SUMOReal width) throw() {
    glPushMatrix();
    glTranslated((beg2.x()+beg1.x())*.5, (beg2.y()+beg1.y())*.5, 0);
    glRotated(rot, 0, 0, 1);
    glBegin(GL_QUADS);
    glVertex2d(-width, 0);
    glVertex2d(-width, -visLength);
    glVertex2d(width, -visLength);
    glVertex2d(width, 0);
    glEnd();
    glPopMatrix();
}


void
GLHelper::drawBoxLines(const PositionVector& geom,
                       const std::vector<SUMOReal> &rots,
                       const std::vector<SUMOReal> &lengths,
                       SUMOReal width) throw() {
    int e = (int) geom.size() - 1;
    for (int i=0; i<e; i++) {
        drawBoxLine(geom[i], rots[i], lengths[i], width);
    }
}


void
GLHelper::drawBoxLines(const PositionVector& geom1,
                       const PositionVector& geom2,
                       const std::vector<SUMOReal> &rots,
                       const std::vector<SUMOReal> &lengths,
                       SUMOReal width) throw() {
    int minS = (int) MIN4(rots.size(), lengths.size(), geom1.size(), geom2.size());
    for (int i=0; i<minS; i++) {
        GLHelper::drawBoxLine(geom1[i], geom2[i], rots[i], lengths[i], width);
    }
}


void
GLHelper::drawBoxLines(const PositionVector& geom, SUMOReal width) throw() {
    int e = (int) geom.size() - 1;
    for (int i=0; i<e; i++) {
        const Position& f = geom[i];
        const Position& s = geom[i+1];
        drawBoxLine(f,
                    (SUMOReal) atan2((s.x()-f.x()), (f.y()-s.y()))*(SUMOReal) 180.0/(SUMOReal) PI,
                    f.distanceTo(s),
                    width);
    }
}


void
GLHelper::drawLine(const Position& beg, SUMOReal rot, SUMOReal visLength) throw() {
    glPushMatrix();
    glTranslated(beg.x(), beg.y(), 0);
    glRotated(rot, 0, 0, 1);
    glBegin(GL_LINES);
    glVertex2d(0, 0);
    glVertex2d(0, -visLength);
    glEnd();
    glPopMatrix();
}


void
GLHelper::drawLine(const Position& beg1, const Position& beg2,
                   SUMOReal rot, SUMOReal visLength) throw() {
    glPushMatrix();
    glTranslated((beg2.x()+beg1.x())*.5, (beg2.y()+beg1.y())*.5, 0);
    glRotated(rot, 0, 0, 1);
    glBegin(GL_LINES);
    glVertex2d(0, 0);
    glVertex2d(0, -visLength);
    glEnd();
    glPopMatrix();
}



void
GLHelper::drawLine(const PositionVector& v) throw() {
    glBegin(GL_LINES);
    int e = (int) v.size() - 1;
    for (int i=0; i<e; ++i) {
        glVertex2d(v[i].x(), v[i].y());
        glVertex2d(v[i+1].x(), v[i+1].y());
    }
    glEnd();
}



void
GLHelper::drawLine(const Position& beg, const Position& end) throw() {
    glBegin(GL_LINES);
    glVertex2d(beg.x(), beg.y());
    glVertex2d(end.x(), end.y());
    glEnd();
}



void
GLHelper::drawFilledCircle(SUMOReal width, int steps) throw() {
    drawFilledCircle(width, steps, 0, 360);
}


void
GLHelper::drawFilledCircle(SUMOReal width, int steps, SUMOReal beg, SUMOReal end) throw() {
    if (myCircleCoords.size()==0) {
        for (int i=0; i<360; i+=10) {
            SUMOReal x = (SUMOReal) sin((SUMOReal) i / 180.0 * PI);
            SUMOReal y = (SUMOReal) cos((SUMOReal) i / 180.0 * PI);
            myCircleCoords.push_back(std::pair<SUMOReal, SUMOReal>(x, y));
        }
    }
    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
    std::pair<SUMOReal, SUMOReal> p1 =
        beg==0 ? myCircleCoords[0] : myCircleCoords[((int) beg/10)%36];
    for (int i=(int)(beg/10); i<steps&&(36.0/(SUMOReal) steps *(SUMOReal) i)*10<end; i++) {
        const std::pair<SUMOReal, SUMOReal> &p2 =
            myCircleCoords[(size_t)(36.0/(SUMOReal) steps * (SUMOReal) i)];
        glBegin(GL_TRIANGLES);
        glVertex2d(p1.first * width, p1.second * width);
        glVertex2d(p2.first * width, p2.second * width);
        glVertex2d(0, 0);
        glEnd();
        p1 = p2;
    }
    const std::pair<SUMOReal, SUMOReal> &p2 =
        end==360 ? myCircleCoords[0] : myCircleCoords[((int) end/10)%36];
    glBegin(GL_TRIANGLES);
    glVertex2d(p1.first * width, p1.second * width);
    glVertex2d(p2.first * width, p2.second * width);
    glVertex2d(0, 0);
    glEnd();
}


void
GLHelper::drawOutlineCircle(SUMOReal width, SUMOReal iwidth, int steps) throw() {
    drawOutlineCircle(width, iwidth, steps, 0, 360);
}


void
GLHelper::drawOutlineCircle(SUMOReal width, SUMOReal iwidth, int steps,
                            SUMOReal beg, SUMOReal end) throw() {
    if (myCircleCoords.size()==0) {
        for (int i=0; i<360; i+=10) {
            SUMOReal x = (SUMOReal) sin((SUMOReal) i / 180.0 * PI);
            SUMOReal y = (SUMOReal) cos((SUMOReal) i / 180.0 * PI);
            myCircleCoords.push_back(std::pair<SUMOReal, SUMOReal>(x, y));
        }
    }
    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
    std::pair<SUMOReal, SUMOReal> p1 =
        beg==0 ? myCircleCoords[0] : myCircleCoords[((int) beg/10)%36];
    for (int i=(int)(beg/10); i<steps&&(36.0/(SUMOReal) steps *(SUMOReal) i)*10<end; i++) {
        const std::pair<SUMOReal, SUMOReal> &p2 =
            myCircleCoords[(size_t)(36.0/(SUMOReal) steps * (SUMOReal) i)];
        glBegin(GL_TRIANGLES);
        glVertex2d(p1.first * width, p1.second * width);
        glVertex2d(p2.first * width, p2.second * width);
        glVertex2d(p2.first * iwidth, p2.second * iwidth);

        glVertex2d(p2.first * iwidth, p2.second * iwidth);
        glVertex2d(p1.first * iwidth, p1.second * iwidth);
        glVertex2d(p1.first * width, p1.second * width);
        glEnd();
        p1 = p2;
    }
    const std::pair<SUMOReal, SUMOReal> &p2 =
        end==360 ? myCircleCoords[0] : myCircleCoords[((int) end/10)%36];
    glBegin(GL_TRIANGLES);
    glVertex2d(p1.first * width, p1.second * width);
    glVertex2d(p2.first * width, p2.second * width);
    glVertex2d(p2.first * iwidth, p2.second * iwidth);

    glVertex2d(p2.first * iwidth, p2.second * iwidth);
    glVertex2d(p1.first * iwidth, p1.second * iwidth);
    glVertex2d(p1.first * width, p1.second * width);
    glEnd();
}


void
GLHelper::drawTriangleAtEnd(const Line& l, SUMOReal tLength,
                            SUMOReal tWidth) throw() {
    if (l.length()<tLength) {
        tWidth = tWidth * l.length() / tLength;
        tLength = l.length();
    }
    Line rl(l.getPositionAtDistance(l.length()-tLength), l.p2());
    glPushMatrix();
    glTranslated(rl.p1().x(), rl.p1().y(), 0);
    glRotated(-l.atan2DegreeAngle(), 0, 0, 1);
    glBegin(GL_TRIANGLES);
    glVertex2d(0, -tLength);
    glVertex2d(-tWidth, 0);
    glVertex2d(+tWidth, 0);
    glEnd();
    glPopMatrix();
}


void
GLHelper::setColor(const RGBColor& c) {
    glColor3d(c.red(), c.green(), c.blue());
}


RGBColor
GLHelper::getColor() {
    GLdouble current[4];
    glGetDoublev(GL_CURRENT_COLOR, current);
    return RGBColor(current[0], current[1], current[2]);
}


void
GLHelper::drawText(const std::string& text, const Position& pos,
                   const SUMOReal layer, const SUMOReal size,
                   const RGBColor& col, const SUMOReal angle) {
    glPushMatrix();
    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
    setColor(col);
    glTranslated(pos.x(), pos.y(), layer);
    pfSetPosition(0, 0);
    pfSetScale(size);
    SUMOReal w = pfdkGetStringWidth(text.c_str());
    glRotated(180, 1, 0, 0);
    glRotated(angle, 0, 0, 1);
    glTranslated(-w/2., 0.4, 0);
    pfDrawString(text.c_str());
    glPopMatrix();
}

void
GLHelper::drawTextBox(const std::string& text, const Position& pos,
                      const SUMOReal layer, const SUMOReal size,
                      const RGBColor& txtColor, const RGBColor& bgColor, const RGBColor& borderColor,
                      const SUMOReal angle) {
    SUMOReal boxAngle = angle + 90;
    if (boxAngle > 360) {
        boxAngle -= 360;
    }
    pfSetScale(size);
    const SUMOReal stringWidth = pfdkGetStringWidth(text.c_str());
    const SUMOReal borderWidth = size / 20;
    const SUMOReal boxHeight = size * 0.8;
    const SUMOReal boxWidth = stringWidth + size / 2;
    glPushMatrix();
    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
    glTranslated(0, 0, layer);
    setColor(borderColor);
    Position left = pos;
    left.sub(boxWidth/2, -boxHeight/2.7);
    drawBoxLine(left, boxAngle, boxWidth, boxHeight);
    left.add(borderWidth*1.5, 0);
    setColor(bgColor);
    glTranslated(0, 0, 0.01);
    drawBoxLine(left, boxAngle, boxWidth - 3*borderWidth, boxHeight - 2*borderWidth);
    // actually we should be able to use drawText here. however, there's
    // something about the constant 0.4 offset which causes trouble
    //drawText(text, pos, layer+0.02, size, txtColor, angle);
    setColor(txtColor);
    glTranslated(pos.x(), pos.y(), 0.01);
    pfSetPosition(0, 0);
    pfSetScale(size);
    glRotated(180, 1, 0, 0);
    glRotated(angle, 0, 0, 1);
    glTranslated(-stringWidth/2., 0, 0);
    pfDrawString(text.c_str());
    glPopMatrix();
}

/****************************************************************************/