molecule-viewer/renderer.hpp at master · justinmeiners/molecule-viewer · GitHub

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/*
 By: Justin Meiners

 Copyright (c) 2015 Justin Meiners
 Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
 */


#ifndef RENDERER_HPP
#define RENDERER_HPP

#include <stdio.h>

#include <OpenGL/gl.h>
#include <OpenGL/glu.h>


template <class Num=double>
class View
{
public:
    View(Num x, Num y, Num z, Num tx, Num ty, Num tz)
    : eyeX(x), eyeY(y), eyeZ(z), targetX(tx), targetY(ty), targetZ(tz), xAngle(0), yAngle(0), showBonds(true)
    {

    }

    Num eyeX;
    Num eyeY;
    Num eyeZ;

    Num targetX;
    Num targetY;
    Num targetZ;

    Num xAngle;
    Num yAngle;

    int width;
    int height;

    bool showBonds;
};


class Renderer
{

public:
    static void ColorForType(Symbol type, double* r, double* g, double*b)
    {
        int index = type % 6;
        int row = type / 6;

        if (index == 0 || index == 3 || index == 4) {
            *r = 1.0/(row + 1);
        }
        if (index == 1 || index == 3 || index == 5) {
            *g = 1.0/(row + 1);
        }
        if (index == 2 || index == 4 || index == 5) {
            *b = 1.0/(row + 1);
        }
    }

    void Reshape(int width, int height)
    {
        glViewport(0, 0, width, height);
    }

    void Render(const Molecule& molecule, const Chemistry<>& chemistry, const View<>& view)
    {
        glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
        glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);

        glEnable(GL_DEPTH_TEST);


        /* 3d view */
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluPerspective(45, 4.0/3.0, 1, 100);

        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();

        gluLookAt(view.eyeX, view.eyeY, view.eyeZ, view.targetX, view.targetY, view.targetZ, 0, 0, 1);


        glEnable(GL_COLOR_MATERIAL);


        glEnable(GL_LIGHTING);

        GLfloat lightPosition[] = {-1.0, -1.0, 1.0, 0.0 };

        glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
        glEnable(GL_LIGHT0);


        glRotatef(view.xAngle, 0.0f, 0.0f, 1.0f);
        glRotatef(view.yAngle, 1.0f, 0.0f, 0.0f);

        glBegin(GL_TRIANGLES);

        for (auto it = molecule.atoms.begin(); it != molecule.atoms.end(); it ++)
        {
            const Atom<>& atom = (*it);

            double r = 0.0, g = 0.0, b = 0.0;

            ColorForType(atom.symbol, &r, &g, &b);

            glColor3d(r, g, b);

            double radius = 0.3;

            for (auto i = 0; i < 2; i ++)
            {
                double z = 1;

                if (i == 1)
                {
                    z = -1;
                }


                glNormal3f(0.577, 0.577,  0.577 * z);
                glVertex3d(atom.x + radius, atom.y, atom.z);
                glNormal3f(0.577, 0.577,  0.577 * z);
                glVertex3d(atom.x, atom.y + radius, atom.z);
                glNormal3f(0.577, 0.577,  0.577 * z);
                glVertex3d(atom.x, atom.y, atom.z + radius * z);

                glNormal3f(-0.577, 0.577,  0.577 * z);
                glVertex3d(atom.x - radius, atom.y, atom.z);
                glNormal3f(-0.577, 0.577,  0.577 * z);
                glVertex3d(atom.x, atom.y + radius, atom.z);
                glNormal3f(-0.577, 0.577,  0.577 * z);
                glVertex3d(atom.x, atom.y, atom.z + radius * z);

                glNormal3f(0.577, -0.577,  0.577 * z);
                glVertex3d(atom.x + radius, atom.y, atom.z);
                glNormal3f(0.577, -0.577,  0.577 * z);
                glVertex3d(atom.x, atom.y - radius, atom.z);
                glNormal3f(0.577, -0.577,  0.577 * z);
                glVertex3d(atom.x, atom.y, atom.z + radius * z);

                glNormal3f(-0.577, -0.577,  0.577 * z);
                glVertex3d(atom.x - radius, atom.y, atom.z);
                glNormal3f(-0.577, -0.577,  0.577 * z);
                glVertex3d(atom.x, atom.y - radius, atom.z);
                glNormal3f(-0.577, -0.577,  0.577 * z);
                glVertex3d(atom.x, atom.y, atom.z + radius * z);
            }

        }
        glEnd();

        glDisable(GL_LIGHTING);


        if (view.showBonds)
        {
            glBegin(GL_LINES);

            glColor3d(1.0, 1.0, 1.0);

            for (auto it = molecule.bonds.begin(); it != molecule.bonds.end(); it ++)
            {
                const Atom<>& atom = molecule.atoms[std::get<0>(*it)];
                const Atom<>& other = molecule.atoms[std::get<1>(*it)];

                glVertex3d(atom.x, atom.y, atom.z);
                glVertex3d(other.x, other.y, other.z);
            }

            glEnd();
        }

    }

private:

};


#endif