GLHelper.cpp

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/****************************************************************************/
// Eclipse SUMO, Simulation of Urban MObility; see https://eclipse.dev/sumo
// Copyright (C) 2001-2024 German Aerospace Center (DLR) and others.
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0/
// This Source Code may also be made available under the following Secondary
// Licenses when the conditions for such availability set forth in the Eclipse
// Public License 2.0 are satisfied: GNU General Public License, version 2
// or later which is available at
// https://www.gnu.org/licenses/old-licenses/gpl-2.0-standalone.html
// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
/****************************************************************************/
// Some methods which help to draw certain geometrical objects in openGL
/****************************************************************************/
#include <config.h>
 
#include <cassert>
#include <utils/geom/GeomHelper.h>
#include <utils/common/StdDefs.h>
#include <utils/common/MsgHandler.h>
#include <utils/common/ToString.h>
#include <utils/options/OptionsCont.h>
#define FONTSTASH_IMPLEMENTATION // Expands implementation
#ifdef _MSC_VER
#pragma warning(disable: 4505 5219) // do not warn about unused functions and implicit float conversions
#endif
#if __GNUC__ > 3
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-function"
#endif
#include <foreign/fontstash/fontstash.h>
#include <utils/gui/globjects/GLIncludes.h>
#define GLFONTSTASH_IMPLEMENTATION // Expands implementation
#include <foreign/fontstash/glfontstash.h>
#include <utils/geom/Boundary.h>
#ifdef HAVE_GL2PS
#include <gl2ps.h>
#endif
#include "Roboto.h"
#include "GLHelper.h"
 
#define CIRCLE_RESOLUTION (double)10 // inverse in degrees
//#define CHECK_PUSHPOP         // enable or disable check push and pop matrix/names
//#define CHECK_ELEMENTCOUNTER  // enable or disable element counter (for matrix and vertex)
 
#ifndef CALLBACK
#define CALLBACK
#endif
 
// ===========================================================================
// static member definitions
// ===========================================================================
 
int GLHelper::myMatrixCounter = 0;
int GLHelper::myVertexCounter = 0;
int GLHelper::myMatrixCounterDebug = 0;
int GLHelper::myNameCounter = 0;
std::vector<std::pair<double, double> > GLHelper::myCircleCoords;
std::vector<RGBColor> GLHelper::myDottedcontourColors;
FONScontext* GLHelper::myFont = nullptr;
double GLHelper::myFontSize = 50.0;
bool GLHelper::myGL2PSActive = false;
 
void CALLBACK combCallback(GLdouble coords[3],
                           GLdouble* vertex_data[4],
                           GLfloat weight[4], GLdouble** dataOut) {
    UNUSED_PARAMETER(weight);
    UNUSED_PARAMETER(*vertex_data);
    GLdouble* vertex;
 
    vertex = (GLdouble*)malloc(7 * sizeof(GLdouble));
 
    vertex[0] = coords[0];
    vertex[1] = coords[1];
    vertex[2] = coords[2];
    *dataOut = vertex;
}
 
// ===========================================================================
// method definitions
// ===========================================================================
 
const std::vector<std::pair<double, double> >&
GLHelper::getCircleCoords() {
    // fill in first call
    if (myCircleCoords.size() == 0) {
        for (int i = 0; i <= (int)(360 * CIRCLE_RESOLUTION); ++i) {
            const double x = (double) sin(DEG2RAD(i / CIRCLE_RESOLUTION));
            const double y = (double) cos(DEG2RAD(i / CIRCLE_RESOLUTION));
            myCircleCoords.push_back(std::pair<double, double>(x, y));
        }
    }
    return myCircleCoords;
}
 
 
int
GLHelper::angleLookup(double angleDeg) {
    const int numCoords = (int)getCircleCoords().size() - 1;
    int index = ((int)(floor(angleDeg * CIRCLE_RESOLUTION + 0.5))) % numCoords;
    if (index < 0) {
        index += numCoords;
    }
    assert(index >= 0);
    return (int)index;
}
 
 
void
GLHelper::pushMatrix() {
    glPushMatrix();
    // update counters
#ifdef CHECK_ELEMENTCOUNTER
    myMatrixCounter++;
#endif
#ifdef CHECK_PUSHPOP
    myMatrixCounterDebug++;
#endif
}
 
 
void
GLHelper::popMatrix() {
    glPopMatrix();
#ifdef CHECK_PUSHPOP
    myMatrixCounterDebug--;
#endif
}
 
 
void
GLHelper::pushName(unsigned int name) {
    glPushName(name);
#ifdef CHECK_PUSHPOP
    myNameCounter++;
#endif
}
 
 
void
GLHelper::popName() {
    glPopName();
#ifdef CHECK_PUSHPOP
    myNameCounter--;
#endif
}
 
 
int
GLHelper::getMatrixCounter() {
    return myMatrixCounter;
}
 
 
void
GLHelper::resetMatrixCounter() {
    myMatrixCounter = 0;
}
 
 
int
GLHelper::getVertexCounter() {
    return myVertexCounter;
}
 
 
void
GLHelper::resetVertexCounter() {
    myVertexCounter = 0;
}
 
 
void
GLHelper::checkCounterMatrix() {
#ifdef CHECK_PUSHPOP
    if (myMatrixCounterDebug != 0) {
        WRITE_WARNING("invalid matrix counter. Check that number of pushMatrix and popMatrix functions calls are the same");
    }
    myMatrixCounterDebug = 0;
#endif
}
 
 
void
GLHelper::checkCounterName() {
#ifdef CHECK_PUSHPOP
    if (myNameCounter != 0) {
        WRITE_WARNING("invalid Name counter. Check that number of pushName and popName functions calls are the same");
    }
    myNameCounter = 0;
#endif
}
 
 
void
GLHelper::drawFilledPoly(const PositionVector& v, bool close) {
    if (v.size() == 0) {
        return;
    }
    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
    glBegin(GL_POLYGON);
    for (PositionVector::const_iterator i = v.begin(); i != v.end(); i++) {
        const Position& p = *i;
        glVertex2d(p.x(), p.y());
#ifdef CHECK_ELEMENTCOUNTER
        myVertexCounter++;
#endif
    }
    if (close) {
        const Position& p = *(v.begin());
        glVertex2d(p.x(), p.y());
#ifdef CHECK_ELEMENTCOUNTER
        myVertexCounter++;
#endif
    }
    glEnd();
}
 
 
void
GLHelper::drawFilledPolyTesselated(const PositionVector& v, bool close) {
    if (v.size() == 0) {
        return;
    }
    GLUtesselator* tobj = gluNewTess();
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4191)
#endif
#if defined(__GNUC__) && __GNUC__ >= 8
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wcast-function-type"
#endif
    gluTessCallback(tobj, GLU_TESS_VERTEX, (GLvoid(CALLBACK*)()) &glVertex3dv);
    gluTessCallback(tobj, GLU_TESS_BEGIN, (GLvoid(CALLBACK*)()) &glBegin);
    gluTessCallback(tobj, GLU_TESS_END, (GLvoid(CALLBACK*)()) &glEnd);
    gluTessCallback(tobj, GLU_TESS_COMBINE, (GLvoid(CALLBACK*)()) &combCallback);
#if defined(__GNUC__) && __GNUC__ >= 8
#pragma GCC diagnostic pop
#endif
#ifdef _MSC_VER
#pragma warning(pop)
#endif
    gluTessProperty(tobj, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_ODD);
    gluTessBeginPolygon(tobj, nullptr);
    gluTessBeginContour(tobj);
    double* points = new double[(v.size() + int(close)) * 3];
 
    for (int i = 0; i != (int)v.size(); ++i) {
        points[3 * i] = v[i].x();
        points[3 * i + 1] = v[i].y();
        points[3 * i + 2] = 0;
        gluTessVertex(tobj, points + 3 * i, points + 3 * i);
    }
    if (close) {
        const int i = (int)v.size();
        points[3 * i] = v[0].x();
        points[3 * i + 1] = v[0].y();
        points[3 * i + 2] = 0;
        gluTessVertex(tobj, points + 3 * i, points + 3 * i);
    }
    gluTessEndContour(tobj);
    gluTessEndPolygon(tobj);
    gluDeleteTess(tobj);
    delete[] points;
}
 
 
void
GLHelper::drawRectangle(const Position& center, const double width, const double height) {
    const double halfWidth = width * 0.5;
    const double halfHeight = height * 0.5;
    GLHelper::pushMatrix();
    glTranslated(center.x(), center.y(), 0);
    glBegin(GL_QUADS);
    glVertex2d(-halfWidth, halfHeight);
    glVertex2d(-halfWidth, -halfHeight);
    glVertex2d(halfWidth, -halfHeight);
    glVertex2d(halfWidth, halfHeight);
    glEnd();
    GLHelper::popMatrix();
#ifdef CHECK_ELEMENTCOUNTER
    myVertexCounter += 4;
#endif
}
 
void
GLHelper::drawBoxLine(const Position& beg, double rot, double visLength,
                      double width, double offset) {
    GLHelper::pushMatrix();
    glTranslated(beg.x(), beg.y(), 0);
    glRotated(rot, 0, 0, 1);
    glBegin(GL_QUADS);
    glVertex2d(-width - offset, 0);
    glVertex2d(-width - offset, -visLength);
    glVertex2d(width - offset, -visLength);
    glVertex2d(width - offset, 0);
    glEnd();
    GLHelper::popMatrix();
#ifdef CHECK_ELEMENTCOUNTER
    myVertexCounter += 4;
#endif
}
 
 
void
GLHelper::drawBoxLine(const Position& beg1, const Position& beg2,
                      double rot, double visLength,
                      double width) {
    GLHelper::pushMatrix();
    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();
    GLHelper::popMatrix();
#ifdef CHECK_ELEMENTCOUNTER
    myVertexCounter += 4;
#endif
}
 
 
bool
GLHelper::rightTurn(double angle1, double angle2) {
    double delta = angle2 - angle1;
    while (delta > 180) {
        delta -= 360;
    }
    while (delta < -180) {
        delta += 360;
    }
    return delta <= 0;
}
 
 
void
GLHelper::drawBoxLines(const PositionVector& geom,
                       const std::vector<double>& rots,
                       const std::vector<double>& lengths,
                       double width, int cornerDetail, double offset) {
    // draw the lane
    int e = (int) geom.size() - 1;
    for (int i = 0; i < e; i++) {
        drawBoxLine(geom[i], rots[i], lengths[i], width, offset);
    }
    // draw the corner details
    if (cornerDetail > 0) {
        for (int i = 1; i < e; i++) {
            GLHelper::pushMatrix();
            glTranslated(geom[i].x(), geom[i].y(), 0.1);
            double angleBeg = -rots[i - 1];
            double angleEnd = 180 - rots[i];
            if (rightTurn(rots[i - 1], rots[i])) {
                std::swap(angleBeg, angleEnd);
            }
            // only draw the missing piece
            angleBeg -= 90;
            angleEnd += 90;
            // avoid drawing more than 360 degrees
            if (angleEnd - angleBeg > 360) {
                angleBeg += 360;
            }
            if (angleEnd - angleBeg < -360) {
                angleEnd += 360;
            }
            // draw the right way around
            if (angleEnd > angleBeg) {
                angleEnd -= 360;
            }
            drawFilledCircle(width + offset, cornerDetail, angleBeg, angleEnd);
            GLHelper::popMatrix();
        }
    }
}
 
 
void
GLHelper::drawBoxLines(const PositionVector& geom,
                       const std::vector<double>& rots,
                       const std::vector<double>& lengths,
                       const std::vector<RGBColor>& cols,
                       double width, int cornerDetail, double offset) {
    int e = (int) geom.size() - 1;
    for (int i = 0; i < e; i++) {
        setColor(cols[i]);
        drawBoxLine(geom[i], rots[i], lengths[i], width, offset);
    }
    if (cornerDetail > 0) {
        for (int i = 1; i < e; i++) {
            GLHelper::pushMatrix();
            setColor(cols[i]);
            glTranslated(geom[i].x(), geom[i].y(), 0);
            drawFilledCircle(width, cornerDetail);
            GLHelper::popMatrix();
        }
    }
}
 
 
void
GLHelper::drawBoxLines(const PositionVector& geom1,
                       const PositionVector& geom2,
                       const std::vector<double>& rots,
                       const std::vector<double>& lengths,
                       double width) {
    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, double width) {
    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,
                    RAD2DEG(atan2((s.x() - f.x()), (f.y() - s.y()))),
                    f.distanceTo(s),
                    width);
    }
}
 
 
void
GLHelper::drawLine(const Position& beg, double rot, double visLength) {
    GLHelper::pushMatrix();
    glTranslated(beg.x(), beg.y(), 0);
    glRotated(rot, 0, 0, 1);
    glBegin(GL_LINES);
    glVertex2d(0, 0);
    glVertex2d(0, -visLength);
    glEnd();
    GLHelper::popMatrix();
#ifdef CHECK_ELEMENTCOUNTER
    myVertexCounter += 2;
#endif
}
 
 
void
GLHelper::drawLine(const Position& beg1, const Position& beg2,
                   double rot, double visLength) {
    GLHelper::pushMatrix();
    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();
    GLHelper::popMatrix();
#ifdef CHECK_ELEMENTCOUNTER
    myVertexCounter += 2;
#endif
}
 
 
 
void
GLHelper::drawLine(const PositionVector& v) {
    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());
#ifdef CHECK_ELEMENTCOUNTER
        myVertexCounter += 2;
#endif
    }
    glEnd();
}
 
 
void
GLHelper::drawLine(const PositionVector& v, const std::vector<RGBColor>& cols) {
    glBegin(GL_LINES);
    int e = (int) v.size() - 1;
    for (int i = 0; i < e; ++i) {
        setColor(cols[i]);
        glVertex2d(v[i].x(), v[i].y());
        glVertex2d(v[i + 1].x(), v[i + 1].y());
#ifdef CHECK_ELEMENTCOUNTER
        myVertexCounter += 2;
#endif
    }
    glEnd();
}
 
 
void
GLHelper::drawLine(const Position& beg, const Position& end) {
    glBegin(GL_LINES);
    glVertex2d(beg.x(), beg.y());
    glVertex2d(end.x(), end.y());
    glEnd();
#ifdef CHECK_ELEMENTCOUNTER
    myVertexCounter += 2;
#endif
}
 
 
void
GLHelper::drawFilledCircleDetailled(const GUIVisualizationSettings::Detail d, const double radius,
                                    double beg, double end) {
    // get current resolution level
    switch (d) {
        case GUIVisualizationSettings::Detail::CircleResolution32:
            drawFilledCircle(radius, 32, beg, end);
            break;
        case GUIVisualizationSettings::Detail::CircleResolution16:
            drawFilledCircle(radius, 16, beg, end);
            break;
        case GUIVisualizationSettings::Detail::CircleResolution8:
            drawFilledCircle(radius, 8, beg, end);
            break;
        case GUIVisualizationSettings::Detail::CircleResolution4:
            drawFilledCircleDetailled(d, radius);
            break;
        default:
            // nothing to draw
            break;
    }
}
 
 
void
GLHelper::drawFilledCircleDetailled(const GUIVisualizationSettings::Detail d, const double radius) {
    // get current resolution level
    switch (d) {
        case GUIVisualizationSettings::Detail::CircleResolution32:
            drawFilledCircle(radius, 32);
            break;
        case GUIVisualizationSettings::Detail::CircleResolution16:
            drawFilledCircle(radius, 16);
            break;
        case GUIVisualizationSettings::Detail::CircleResolution8:
            drawFilledCircle(radius, 8);
            break;
        default:
            // draw only a square
            GLHelper::pushMatrix();
            glBegin(GL_QUADS);
            glVertex2d(-radius, radius);
            glVertex2d(-radius, -radius);
            glVertex2d(radius, -radius);
            glVertex2d(radius, radius);
            glEnd();
            GLHelper::popMatrix();
#ifdef CHECK_ELEMENTCOUNTER
            myVertexCounter += 4;
#endif
            break;
    }
}
 
void
GLHelper::drawFilledCircle(double const radius, int const steps) {
    drawFilledCircle(radius, steps, 0, 360);
}
 
 
void
GLHelper::drawFilledCircle(double radius, int steps, double beg, double end) {
    const double inc = (end - beg) / (double)steps;
    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
    std::pair<double, double> p1 = getCircleCoords().at(angleLookup(beg));
 
    for (int i = 0; i <= steps; ++i) {
        const std::pair<double, double>& p2 = getCircleCoords().at(angleLookup(beg + i * inc));
        glBegin(GL_TRIANGLES);
        glVertex2d(p1.first * radius, p1.second * radius);
        glVertex2d(p2.first * radius, p2.second * radius);
        glVertex2d(0, 0);
        glEnd();
        p1 = p2;
#ifdef CHECK_ELEMENTCOUNTER
        myVertexCounter += 3;
#endif
    }
}
 
 
void
GLHelper::drawOutlineCircle(double radius, double iRadius, int steps) {
    drawOutlineCircle(radius, iRadius, steps, 0, 360);
}
 
 
void
GLHelper::drawOutlineCircle(double radius, double iRadius, int steps,
                            double beg, double end) {
    const double inc = (end - beg) / (double)steps;
    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
    std::pair<double, double> p1 = getCircleCoords().at(angleLookup(beg));
 
    for (int i = 0; i <= steps; ++i) {
        const std::pair<double, double>& p2 = getCircleCoords().at(angleLookup(beg + i * inc));
        glBegin(GL_TRIANGLES);
        glVertex2d(p1.first * radius, p1.second * radius);
        glVertex2d(p2.first * radius, p2.second * radius);
        glVertex2d(p2.first * iRadius, p2.second * iRadius);
 
        glVertex2d(p2.first * iRadius, p2.second * iRadius);
        glVertex2d(p1.first * iRadius, p1.second * iRadius);
        glVertex2d(p1.first * radius, p1.second * radius);
 
        glEnd();
        p1 = p2;
#ifdef CHECK_ELEMENTCOUNTER
        myVertexCounter += 6;
#endif
    }
}
 
 
void
GLHelper::drawTriangleAtEnd(const Position& p1, const Position& p2, double tLength,
                            double tWidth, const double extraOffset) {
    const double length = p1.distanceTo(p2);
    if (length < tLength) {
        tWidth *= length / tLength;
        tLength = length;
    }
    Position rl(PositionVector::positionAtOffset(p1, p2, length - tLength));
    GLHelper::pushMatrix();
    glTranslated(rl.x(), rl.y(), 0);
    glRotated(-GeomHelper::naviDegree(p1.angleTo2D(p2)), 0, 0, 1);
    glTranslated(0, extraOffset, 0);
    glBegin(GL_TRIANGLES);
    glVertex2d(0, tLength);
    glVertex2d(-tWidth, 0);
    glVertex2d(+tWidth, 0);
    glEnd();
    GLHelper::popMatrix();
#ifdef CHECK_ELEMENTCOUNTER
    myVertexCounter += 3;
#endif
}
 
 
void
GLHelper::setColor(const RGBColor& c) {
    glColor4ub(c.red(), c.green(), c.blue(), c.alpha());
}
 
 
RGBColor
GLHelper::getColor() {
    GLdouble current[4];
    glGetDoublev(GL_CURRENT_COLOR, current);
    return RGBColor(static_cast<unsigned char>(current[0] * 255. + 0.5),
                    static_cast<unsigned char>(current[1] * 255. + 0.5),
                    static_cast<unsigned char>(current[2] * 255. + 0.5),
                    static_cast<unsigned char>(current[3] * 255. + 0.5));
}
 
 
void
GLHelper::resetFont() {
    glfonsDelete(myFont);
    myFont = nullptr;
}
 
 
void
GLHelper::setGL2PS(bool active) {
    myGL2PSActive = active;
}
 
 
void
GLHelper::drawSpaceOccupancies(const double exaggeration, const Position& pos, const double rotation,
                               const double width, const double length, const bool vehicle) {
    // declare colors
    const RGBColor red(255, 0, 0, 255);
    const RGBColor green(0, 255, 0, 255);
    // declare geometry
    PositionVector geom;
    const double w = width / 2. - 0.1 * exaggeration;
    const double h = length;
    // set geometry
    geom.push_back(Position(-w, +0, 0.));
    geom.push_back(Position(+w, +0, 0.));
    geom.push_back(Position(+w, +h, 0.));
    geom.push_back(Position(-w, +h, 0.));
    geom.push_back(Position(-w, +0, 0.));
    /*
    geom.push_back(Position(pos.x(), pos.y(), pos.z()));
    geom.push_back(Position(pos.x() + (*l).second.myWidth, pos.y(), pos.z()));
    geom.push_back(Position(pos.x() + (*l).second.myWidth, pos.y() - (*l).second.myLength, pos.z()));
    geom.push_back(Position(pos.x(), pos.y() - (*l).second.myLength, pos.z()));
    geom.push_back(Position(pos.x(), pos.y(), pos.z()));
    */
    // push matrix
    GLHelper::pushMatrix();
    // translate
    glTranslated(pos.x(), pos.y(), pos.z());
    // rotate
    glRotated(rotation, 0, 0, 1);
    // set color
    GLHelper::setColor(vehicle ? green : red);
    // draw box lines
    GLHelper::drawBoxLines(geom, 0.1 * exaggeration);
    // pop matrix
    GLHelper::popMatrix();
}
 
 
bool
GLHelper::initFont() {
    if (myFont == nullptr) {
        myFont = glfonsCreate(2048, 2048, FONS_ZERO_BOTTOMLEFT);
        if (myFont != nullptr) {
            const int fontNormal = fonsAddFontMem(myFont, "medium", data_font_Roboto_Medium_ttf, data_font_Roboto_Medium_ttf_len, 0);
            fonsSetFont(myFont, fontNormal);
            fonsSetSize(myFont, (float)myFontSize);
        }
    }
    return myFont != nullptr;
}
 
 
const std::vector<RGBColor>&
GLHelper::getDottedcontourColors(const int size) {
    // check if more colors has to be added
    while ((int)myDottedcontourColors.size() < size) {
        if (myDottedcontourColors.empty() || myDottedcontourColors.back() == RGBColor::WHITE) {
            myDottedcontourColors.push_back(RGBColor::BLACK);
        } else {
            myDottedcontourColors.push_back(RGBColor::WHITE);
        }
    }
    return myDottedcontourColors;
}
 
 
double
GLHelper::getTextWidth(const std::string& text, double size) {
    return size / myFontSize * fonsTextBounds(myFont, 0, 0, text.c_str(), nullptr, nullptr);
}
 
 
void
GLHelper::drawText(const std::string& text, const Position& pos, const double layer, const double size,
                   const RGBColor& col, const double angle, const int align, double width) {
    if (width <= 0) {
        width = size;
    }
    if (!initFont()) {
        return;
    }
    GLHelper::pushMatrix();
    glAlphaFunc(GL_GREATER, 0.5);
    glEnable(GL_ALPHA_TEST);
#ifdef HAVE_GL2PS
    if (myGL2PSActive) {
        glRasterPos3d(pos.x(), pos.y(), layer);
        GLfloat color[] = {col.red() / 255.f, col.green() / 255.f, col.blue() / 255.f, col.alpha() / 255.f};
        gl2psTextOptColor(text.c_str(), "Roboto", 10, align == 0 ? GL2PS_TEXT_C : align, (GLfloat) - angle, color);
        GLHelper::popMatrix();
        return;
    }
#endif
    glTranslated(pos.x(), pos.y(), layer);
    glScaled(width / myFontSize, size / myFontSize, 1.);
    glRotated(-angle, 0, 0, 1);
    fonsSetAlign(myFont, align == 0 ? FONS_ALIGN_CENTER | FONS_ALIGN_MIDDLE : align);
    fonsSetColor(myFont, glfonsRGBA(col.red(), col.green(), col.blue(), col.alpha()));
    fonsDrawText(myFont, 0., 0., text.c_str(), nullptr);
    GLHelper::popMatrix();
}
 
 
void
GLHelper::drawTextSettings(
    const GUIVisualizationTextSettings& settings,
    const std::string& text, const Position& pos,
    const double scale,
    const double angle,
    const double layer,
    const int align) {
    drawTextBox(text, pos, layer,
                settings.scaledSize(scale),
                settings.color,
                settings.bgColor,
                RGBColor::INVISIBLE,
                angle, 0, 0.2, align);
}
 
 
void
GLHelper::drawTextBox(const std::string& text, const Position& pos,
                      const double layer, const double size,
                      const RGBColor& txtColor, const RGBColor& bgColor, const RGBColor& borderColor,
                      const double angle,
                      const double relBorder,
                      const double relMargin,
                      const int align) {
    if (!initFont()) {
        return;
    };
    if (bgColor.alpha() != 0) {
        const double boxAngle = 90;
        const double stringWidth = size / myFontSize * fonsTextBounds(myFont, 0, 0, text.c_str(), nullptr, nullptr);
        const double borderWidth = size * relBorder;
        const double boxHeight = size * (0.32 + 0.6 * relMargin);
        const double boxWidth = stringWidth + size * relMargin;
        GLHelper::pushMatrix();
        glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
        glTranslated(pos.x(), pos.y(), layer);
        glRotated(-angle, 0, 0, 1);
        Position left(-boxWidth * 0.5, 0);
        setColor(borderColor);
        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);
        GLHelper::popMatrix();
    }
    drawText(text, pos, layer + 0.02, size, txtColor, angle, align);
}
 
 
void
GLHelper::drawTextAtEnd(const std::string& text, const PositionVector& shape, double x,
                        const GUIVisualizationTextSettings& settings, const double scale) {
    GLHelper::pushMatrix();
    const Position& end = shape.back();
    const Position& f = shape[-2];
    const double rot = RAD2DEG(atan2((end.x() - f.x()), (f.y() - end.y())));
    glTranslated(end.x(), end.y(), 0);
    glRotated(rot, 0, 0, 1);
    drawTextBox(text, Position(x, 0.26), 0,
                settings.scaledSize(scale, 0.01),
                settings.color,
                settings.bgColor,
                RGBColor::INVISIBLE,
                180, 0, 0.2);
    GLHelper::popMatrix();
}
 
 
void
GLHelper::drawCrossTies(const PositionVector& geom, const std::vector<double>& rots,
                        const std::vector<double>& lengths, double length, double spacing,
                        double halfWidth, double offset, bool lessDetail) {
    GLHelper::pushMatrix();
    // draw on top of of the white area between the rails
    glTranslated(0, 0, 0.1);
    int e = (int) geom.size() - 1;
    for (int i = 0; i < e; ++i) {
        GLHelper::pushMatrix();
        glTranslated(geom[i].x(), geom[i].y(), 0.0);
        glRotated(rots[i], 0, 0, 1);
        // draw crossing depending of detail
        if (!lessDetail) {
            for (double t = 0; t < lengths[i]; t += spacing) {
                glBegin(GL_QUADS);
                glVertex2d(-halfWidth - offset, -t);
                glVertex2d(-halfWidth - offset, -t - length);
                glVertex2d(halfWidth - offset, -t - length);
                glVertex2d(halfWidth - offset, -t);
                glEnd();
#ifdef CHECK_ELEMENTCOUNTER
                myVertexCounter += 4;
#endif
            }
        } else {
            // only draw a single rectangle if it's being drawn only for selecting
            glBegin(GL_QUADS);
            glVertex2d(-halfWidth - offset, 0);
            glVertex2d(-halfWidth - offset, -lengths.back());
            glVertex2d(halfWidth - offset, -lengths.back());
            glVertex2d(halfWidth - offset, 0);
            glEnd();
#ifdef CHECK_ELEMENTCOUNTER
            myVertexCounter += 4;
#endif
        }
        // pop three draw matrix
        GLHelper::popMatrix();
    }
    GLHelper::popMatrix();
}
 
void
GLHelper::drawInverseMarkings(const PositionVector& geom,
                              const std::vector<double>& rots,
                              const std::vector<double>& lengths,
                              double maxLength, double spacing,
                              double halfWidth, bool cl, bool cr, bool lefthand, double scale) {
 
    double mw = (halfWidth + SUMO_const_laneMarkWidth * (cl ? 0.6 : 0.2)) * scale;
    double mw2 = (halfWidth - SUMO_const_laneMarkWidth * (cr ? 0.6 : 0.2)) * scale;
    if (cl || cr) {
        if (lefthand) {
            mw *= -1;
            mw2 *= -1;
        }
        int e = (int) geom.size() - 1;
        double offset = 0;
        for (int i = 0; i < e; ++i) {
            GLHelper::pushMatrix();
            glTranslated(geom[i].x(), geom[i].y(), 2.1);
            glRotated(rots[i], 0, 0, 1);
            double t;
            for (t = offset; t < lengths[i]; t += spacing) {
                const double length = MIN2((double)maxLength, lengths[i] - t);
                glBegin(GL_QUADS);
                glVertex2d(-mw, -t);
                glVertex2d(-mw, -t - length);
                glVertex2d(-mw2, -t - length);
                glVertex2d(-mw2, -t);
                glEnd();
#ifdef CHECK_ELEMENTCOUNTER
                myVertexCounter += 4;
#endif
                if (!cl || !cr) {
                    // draw inverse marking between asymmetrical lane markings
                    const double length2 = MIN2((double)6, lengths[i] - t);
                    glBegin(GL_QUADS);
                    glVertex2d(-halfWidth + 0.02, -t - length2);
                    glVertex2d(-halfWidth + 0.02, -t - length);
                    glVertex2d(-halfWidth - 0.02, -t - length);
                    glVertex2d(-halfWidth - 0.02, -t - length2);
                    glEnd();
#ifdef CHECK_ELEMENTCOUNTER
                    myVertexCounter += 4;
#endif
                }
            }
            offset = t - lengths[i] - spacing;
            GLHelper::popMatrix();
        }
    }
}
 
 
void
GLHelper::debugVertices(const PositionVector& shape, const GUIVisualizationTextSettings& settings, double scale, double layer) {
    for (int i = 0; i < (int)shape.size(); ++i) {
        drawTextBox(toString(i), shape[i], layer,
                    settings.scaledSize(scale),
                    settings.color,
                    settings.bgColor,
                    RGBColor::INVISIBLE,
                    0, 0, 0.2);
    }
}
 
 
void
GLHelper::drawBoundary(const GUIVisualizationSettings& s, const Boundary& b) {
    if (s.drawBoundaries) {
        GLHelper::pushMatrix();
        GLHelper::setColor(RGBColor::MAGENTA);
        // draw on top
        glTranslated(0, 0, 1024);
        drawLine(Position(b.xmin(), b.ymax()), Position(b.xmax(), b.ymax()));
        drawLine(Position(b.xmax(), b.ymax()), Position(b.xmax(), b.ymin()));
        drawLine(Position(b.xmax(), b.ymin()), Position(b.xmin(), b.ymin()));
        drawLine(Position(b.xmin(), b.ymin()), Position(b.xmin(), b.ymax()));
        GLHelper::popMatrix();
    }
}
 
 
/****************************************************************************/