source: trunk/packages/vizservers/nanovis/Grid.cpp @ 1522

#include <GL/glew.h>
#include <GL/gl.h>
#include <stdlib.h>
#include <stdio.h>
#include "Grid.h"

#define NUMDIGITS       6
#define GRID_TICK       0.05

Grid::Grid() : 
    _axisColor(1.0f, 1.0f, 1.0f, 1.0f), 
    _majorColor(1.0f, 1.0f, 1.0f, 1.0f), 
    _minorColor(0.5f, 0.5f, 0.5f, 1.0f), 
    _font(0), 
    _visible(false),
    xAxis("X"), 
    yAxis("Y"), 
    zAxis("Z")
{
    /*empty*/
}

void Grid::render()
{
    glPushMatrix();
    glEnable(GL_DEPTH_TEST);
    glDisable(GL_TEXTURE_2D);
    glEnable(GL_BLEND);

#ifdef notdef
    glEnable(GL_LINE_SMOOTH);
#endif
#ifdef notdef
    glScalef(xAxis.scale(), 
             yAxis.range() / xAxis.range(), 
             zAxis.range() / xAxis.range());
#endif
    glScalef(1.0, 1.0, 1.0);

    glTranslatef(-0.5f, -0.5f, -0.5f);
    glLineWidth(2.0f);
    glColor4f(_axisColor.red, _axisColor.green, _axisColor.blue, 
              _axisColor.alpha);

    glBegin(GL_LINES);
    {
        glVertex3f(0.0f, 0.0f, 0.0f);
        glVertex3f(1.0f + GRID_TICK, 0.0f, 0.0f);
        glVertex3f(0.0f, 0.0f, 0.0f);
        glVertex3f(0.0f, 1.0f + GRID_TICK, 0.0f);
        glVertex3f(0.0f, 0.0f, 0.0f);
        glVertex3f(0.0f, 0.0f, 1.0f + GRID_TICK);
    }
    glEnd();

    glLineWidth(1.0f);
    glColor4f(_majorColor.red, _majorColor.green, _majorColor.blue, 
              _majorColor.alpha);

    glBegin(GL_LINES);
    {
        bool result;
        TickIter iter;

        for (result = xAxis.FirstMajor(iter); result; result = iter.Next()) {
            float x;
            x = xAxis.Map(iter.GetValue());
            glVertex3f(x, 0.0f, 0.0f);
            glVertex3f(x, 1.0f, 0.0f);
            glVertex3f(x, 0.0f, 0.0f);
            glVertex3f(x, 0.0f, 1.0f + GRID_TICK);
        }
        for (result = yAxis.FirstMajor(iter); result; result = iter.Next()) {
            float y;
            y = yAxis.Map(iter.GetValue());
            glVertex3f(0.0f, y, 0.0f);
            glVertex3f(1.0f + GRID_TICK, y, 0.0f);
            glVertex3f(0.0f, y, 0.0f);
            glVertex3f(0.0f, y, 1.0f);
        }
        for (result = zAxis.FirstMajor(iter); result; result = iter.Next()) {
            float z;
            z = zAxis.Map(iter.GetValue());
            glVertex3f(0.0f, 0.0f, z);
            glVertex3f(0.0f, 1.0f, z);
            glVertex3f(0.0f, 0.0f, z);
            glVertex3f(1.0f + GRID_TICK, 0.0f, z);
        }
    }
    glEnd();

    // Set minor line color
    glColor4f(_minorColor.red, _minorColor.green, _minorColor.blue,
              _minorColor.alpha);

    glBegin(GL_LINES);
    {
        bool result;
        TickIter iter;

        for (result = xAxis.FirstMinor(iter); result; result = iter.Next()) {
            float x;
            x = xAxis.Map(iter.GetValue());
            glVertex3f(x, 0.0f, 0.0f);
            glVertex3f(x, 1.0f, 0.0f);
            glVertex3f(x, 0.0f, 0.0f);
            glVertex3f(x, 0.0f, 1.0f);
        }
        for (result = yAxis.FirstMinor(iter); result; result = iter.Next()) {
            float y;
            y = yAxis.Map(iter.GetValue());
            glVertex3f(0.0f, y, 0.0f);
            glVertex3f(1.0f, y, 0.0f);
            glVertex3f(0.0f, y, 0.0f);
            glVertex3f(0.0f, y, 1.0f);
        }
        for (result = zAxis.FirstMinor(iter); result; result = iter.Next()) {
            float z;
            z = zAxis.Map(iter.GetValue());
            glVertex3f(0.0f, 0.0f, z);
            glVertex3f(0.0f, 1.0f, z);
            glVertex3f(0.0f, 0.0f, z);
            glVertex3f(1.0f, 0.0f, z);
        }
    }
    glEnd();

    if (_font != NULL) {
        double mv[16], prjm[16];
        int viewport[4];
        double wx, wy, wz;
        bool result;
        TickIter iter;

        glGetDoublev(GL_MODELVIEW_MATRIX, mv);
        glGetDoublev(GL_PROJECTION_MATRIX, prjm);
        glGetIntegerv(GL_VIEWPORT, viewport);
        
        _font->begin();
        if (gluProject(1.2, 0.0, 0.0, mv, prjm, viewport, &wx, &wy, &wz)) {
            glLoadIdentity();
            glTranslatef((int) wx, viewport[3] - (int) wy, 0);
            const char *name = xAxis.name();
            if (name == NULL) {
                name = "???";
            }
            _font->draw(name);
        }
        
        if (gluProject(0.0, 1.2, 0.0, mv, prjm, viewport, &wx, &wy, &wz)) {
            glLoadIdentity();
            glTranslatef((int) wx, viewport[3] - (int)wy, 0);
            const char *name = yAxis.name();
            if (name == NULL) {
                name = "???";
            }
            _font->draw(name);
        }
        
        if (gluProject(0.0, 0.0, 1.2, mv, prjm, viewport, &wx, &wy, &wz)) {
            glLoadIdentity();
            glTranslatef((int) wx, (int) viewport[3] - (int)wy, 0.0f);
            const char *name = zAxis.name();
            if (name == NULL) {
                name = "???";
            }
            _font->draw(name);
        }
        
        glColor4f(1.0f, 1.0f, 0.0f, 1.0f); 

        for (result = xAxis.FirstMajor(iter); result; result = iter.Next()) {
            float x;
            x = xAxis.Map(iter.GetValue());
            if (gluProject(x, 0.0f, 1.06f, mv, prjm, viewport, &wx, &wy, &wz)) {
                char buff[20];
                glLoadIdentity();
                glTranslatef((int) wx, (int) viewport[3] - (int)wy, 0.0f);
                sprintf(buff, "%.*g", NUMDIGITS, iter.GetValue());
                _font->draw(buff);
            }
        }
        for (result = yAxis.FirstMajor(iter); result; result = iter.Next()) {
            float y;
            y = yAxis.Map(iter.GetValue());
            if (gluProject(1.06f, y, 0.0f, mv, prjm, viewport, &wx, &wy, &wz)) {
                char buff[20];
                glLoadIdentity();
                glTranslatef((int) wx, (int) viewport[3] - (int)wy, 0.0f);
                sprintf(buff, "%.*g", NUMDIGITS, iter.GetValue());
                _font->draw(buff);
            }
        }
        for (result = zAxis.FirstMajor(iter); result; result = iter.Next()) {
            float z;
            z = zAxis.Map(iter.GetValue());
            if (gluProject(1.06f, 0.0f, z, mv, prjm, viewport, &wx, &wy, &wz)) {
                char buff[20];
                glLoadIdentity();
                glTranslatef((int) wx, (int) viewport[3] - (int)wy, 0.0f);
                sprintf(buff, "%.*g", NUMDIGITS, iter.GetValue());
                _font->draw(buff);
            }
        }
        _font->end();
    };
    glPopMatrix();
    glDisable(GL_DEPTH_TEST);
    glDisable(GL_BLEND);
#ifdef notdef
    glDisable(GL_LINE_SMOOTH);
#endif
}
 
void Grid::setFont(R2Fonts* font)
{
//      if (font == _font) return;
//      if (font) font->addRef();
//      if (_font) _font->unrefDelete();
        
    _font = font;
}