source: trunk/vizservers/nanovis/Grid.cpp @ 862

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

Grid::Grid()
: _axisColor(1.0f, 1.0f, 1.0f, 1.0f), _font(0), _axisGridLineCount(5.0f, 5.0f, 5.0f),
_axisMin(0.0f, 0.0f, 0.0f), _axisMax(1.0f, 1.0f, 1.0f), _gridLineColor(1.0f, 1.0f, 1.0f, 1.0f), _visible(false)
{
    __axisScale = _axisMax - _axisMin;
    _axisName[0] = "X";
    _axisName[1] = "Y";
    _axisName[2] = "Z";
}

void Grid::render()
{
    glPushMatrix();
    glEnable(GL_DEPTH_TEST);

    glScalef(1.0 / __axisScale.x, __axisScale.y / __axisScale.x, __axisScale.z / __axisScale.x);

    glTranslatef(-0.5f, -0.5f, -0.5f);
    glLineWidth(2.0f);
    glColor3f(_axisColor.x, _axisColor.y, _axisColor.z);

    glBegin(GL_LINES);
    {
        glVertex3f(0.0f,0.0f,0.0f);
        glVertex3f(1.2f,0.0f,0.0f);
        glVertex3f(0.0f,0.0f,0.0f);
        glVertex3f(0.0f,1.2f,0.0f);
        glVertex3f(0.0f, 0.0f, 0.0f);
        glVertex3f(0.0f, 0.0f, 1.2f);
    }
    glEnd();

    glDisable(GL_TEXTURE_2D);
    glLineWidth(1.0f);
    glEnable(GL_BLEND);
    glColor3f(_gridLineColor.x, _gridLineColor.y, _gridLineColor.z);
    glBegin(GL_LINES);

    float linecount = 2.0f;
    float linecountY = 4.0f;
    // +y
    for (int i = 1; i <= (int) _axisGridLineCount.y; ++i) {
        glVertex3f(0.0f, i / _axisGridLineCount.y, 0.0f);
        glVertex3f(1.1f, i / _axisGridLineCount.y, 0.0f);
    }
    
    for (int i = 1; i <= (int) _axisGridLineCount.x; ++i) {
        glVertex3f(i / _axisGridLineCount.x, 0.0f, 0.0f);
        glVertex3f(i / _axisGridLineCount.x, 1.0f, 0.0f);
    }
    
    for (int i = 1; i <= (int) _axisGridLineCount.z; ++i) {
        glVertex3f(0.0f, 0.0f, i / _axisGridLineCount.z);
        glVertex3f(0.0f, 1.0f, i / _axisGridLineCount.z);
    }
    
    for (int i = 1; i <= (int) _axisGridLineCount.y; ++i) {
        glVertex3f(0.0f, i / _axisGridLineCount.y, 0.0f);
        glVertex3f(0.0f, i / _axisGridLineCount.y, 1.0f);
    }
    
    for (int i = 1; i <= (int) _axisGridLineCount.x; ++i) {
        glVertex3f(i / _axisGridLineCount.x,0.0f, 0.0f);
        glVertex3f(i / _axisGridLineCount.x,0.0f, 1.1f);
    }
    
    for (int i = 1; i <= (int) _axisGridLineCount.z; ++i) {
        glVertex3f(0.0f, 0.0f, i / _axisGridLineCount.z);
        glVertex3f(1.1f, 0.0f, i / _axisGridLineCount.z);
    }
    glEnd();

    if (_font) {
        double x = 1.0f, y = 0.0f, z = 0.0f;
        double mv[16], prjm[16];
        int viewport[4];
        double winx, winy, winz;
        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, &winx, &winy, 
                       &winz)) {
            glLoadIdentity();
            glTranslatef((int) winx, viewport[3] - (int) winy, 0);
            _font->draw((const char*) _axisName[0]);
        }
        
        if (gluProject(0.0, 1.2, 0.0, mv, prjm, viewport, &winx, &winy, 
                       &winz)) {
            glLoadIdentity();
            glTranslatef((int) winx, viewport[3] - (int)winy, 0);
            _font->draw((const char*) _axisName[1]);
        }
        
        if (gluProject(0.0, 0.0, 1.2, mv, prjm, viewport, &winx, &winy, 
                       &winz)) {
            glLoadIdentity();
            glTranslatef((int) winx, (int) viewport[3] - (int)winy, 0.0f);
            _font->draw((const char*) _axisName[2]);
        }
        
        glColor4f(1.0f, 1.0f, 0.0f, 0.5f);
        char buff[20];
        // Y
        for (int i = 1; i <= (int) _axisGridLineCount.y; ++i) {
            if (gluProject(1.2, i / _axisGridLineCount.y, 0.0f, mv, prjm, viewport, &winx, &winy, &winz)) {
                glLoadIdentity();
                glTranslatef((int) winx, (int) viewport[3] - (int)winy, 0.0f);
                sprintf(buff, "%0.2f", __axisScale.y / _axisGridLineCount.y * i + _axisMin.y);
                _font->draw(buff);
            }
        }
        
        for (int i = 1; i <= (int) _axisGridLineCount.z; ++i) {
            if (gluProject(1.2, 0.0, i / _axisGridLineCount.z , mv, prjm, viewport, &winx, &winy, &winz)) {
                glLoadIdentity();
                glTranslatef((int) winx, (int) viewport[3] - (int)winy, 0.0f);
                sprintf(buff, "%0.2f", __axisScale.z / _axisGridLineCount.z * i + _axisMin.z);
                _font->draw(buff);
            }
        }
        
        for (int i = 1; i <= (int) _axisGridLineCount.x; ++i) {
            if (gluProject( i / _axisGridLineCount.x, 0.0f, 1.2, mv, prjm, viewport, &winx, &winy, &winz)) {
                glLoadIdentity();
                glTranslatef((int) winx, (int) viewport[3] - (int)winy, 0.0f);
                sprintf(buff, "%0.2f", __axisScale.x / _axisGridLineCount.x * i + _axisMin.x);
                _font->draw(buff);
            }
        }
        
        _font->end();
    };
    
    glPopMatrix();
    glDisable(GL_DEPTH_TEST);
    glDisable(GL_BLEND);
}
 
void Grid::setFont(R2Fonts* font)
{
//      if (font == _font) return;
//      if (font) font->addRef();
//      if (_font) _font->unrefDelete();
        
    _font = font;
}