src/screengrid.cpp

   1 #include "screengrid.h"
   2
   3 ScreenGrid::ScreenGrid()
   4 {
   5
   6     regenerate = true;
   7
   8 }
   9
  10
  11 ScreenGrid::~ScreenGrid()
  12 {
  13 }
  14
  15
  16
  17 /*!
  18     \fn ScreenGrid::Init()
  19  */
  20 void ScreenGrid::Init()
  21 {
  22 extern Options options;
  23     grid_step = options.getFloatValue( Options::GRID_STEP );
  24     bold_step   = 10;
  25     labels_size = 0.05f;
  26
  27     grid_size = GlScreenSize.val.x / 2 + 2 * (grid_step * bold_step);
  28 }
  29
  30
  31 void ScreenGrid::RegenerateGrid()
  32 {
  33
  34       // Creating grid
  35
  36       grid_list = glGenLists(1);
  37       glNewList(grid_list,GL_COMPILE);
  38
  39       GLint   bold_step_counter = 0;
  40
  41       for ( GLfloat x = - grid_size; x <= grid_size; x+= grid_step ) {
  42
  43         if(bold_step_counter) {
  44
  45           glColor3f(0.0f, 0.10f, 0.0f);
  46
  47           glBegin( GL_LINES );
  48             glVertex2f( x, - grid_size);
  49             glVertex2f( x,   grid_size);
  50           glEnd();
  51
  52           glBegin( GL_LINES );
  53             glVertex2f( - grid_size, x);
  54             glVertex2f(   grid_size, x);
  55           glEnd();
  56
  57         }
  58
  59         bold_step_counter++;
  60         if (bold_step_counter >= bold_step) bold_step_counter = 0;
  61
  62       }
  63
  64       for ( GLfloat x = - grid_size;  x <= grid_size; x+= grid_step * bold_step ) {
  65
  66         glColor3f(0.0,0.3,0.0);
  67
  68         glBegin( GL_LINES );
  69           glVertex2f( x, - grid_size);
  70           glVertex2f( x,   grid_size);
  71         glEnd();
  72
  73         glBegin( GL_LINES );
  74           glVertex2f( - grid_size, x);
  75           glVertex2f(   grid_size, x);
  76         glEnd();
  77       }
  78
  79       glEndList();
  80    // End creating grid
  81
  82 }
  83
  84
  85
  86 /*!
  87     \fn ScreenGrid::display_labels()
  88  */
  89 void ScreenGrid::display_labels()
  90 {
  91
  92    GLfloat gl_width  =   GlScreenSize.val.x / 2;
  93    GLfloat gl_height = - GlScreenSize.val.y / 2;
  94
  95    GLfloat otstup = 1;
  96
  97    // Show labels - horisontal
  98    glColor3f(1.0,0.6,0.0);
  99
 100    glPushMatrix();
 101    glLoadIdentity();
 102
 103    glTranslatef(grid_center_x, -gl_height* otstup, -gl_depth);
 104
 105    for ( GLfloat x = - grid_size;  x <= grid_size; x+= grid_step * bold_step ) {
 106
 107         glBegin( GL_TRIANGLES );
 108           glVertex2f( x,               0.0f);
 109           glVertex2f( x + labels_size, labels_size);
 110           glVertex2f( x - labels_size, labels_size);
 111         glEnd();
 112
 113    }
 114
 115    glPopMatrix();
 116
 117    // Show labels - vertical
 118    glPushMatrix();
 119    glLoadIdentity();
 120
 121    glTranslatef( - gl_width * otstup, grid_center_y, -gl_depth);
 122
 123    for ( GLfloat y = - grid_size;  y <= grid_size; y+= grid_step * bold_step ) {
 124
 125         glBegin( GL_TRIANGLES );
 126           glVertex2f( 0.0f, 0.0f + y);
 127           glVertex2f( -labels_size, labels_size + y);
 128           glVertex2f( -labels_size, -labels_size +y);
 129         glEnd();
 130
 131    }
 132
 133     glPopMatrix();
 134
 135 }
 136
 137
 138 void ScreenGrid::display( Vector2D view_coord )
 139 {
 140
 141     if ( regenerate ) { regenerate = false; RegenerateGrid(); }
 142
 143     grid_center_x = - fmodf ( (float)view_coord.val.x, fabs(grid_step * bold_step) );
 144     grid_center_y = - fmodf ( (float)view_coord.val.y, fabs(grid_step * bold_step) );
 145
 146     glPushMatrix();
 147 //    glLoadIdentity();
 148     glTranslatef(grid_center_x, grid_center_y, 0.0f);
 149
 150     // Отключим на время рисования сетки тест глубины и задних плоскостей
 151     glDisable(GL_DEPTH_TEST);
 152     glDisable(GL_CULL_FACE);
 153
 154     glCallList(grid_list); // сетка
 155     display_labels(); // сверху рисуем метки
 156
 157     // Вернём тест глубины и задних плоскостей
 158     glEnable(GL_DEPTH_TEST);
 159     glEnable(GL_CULL_FACE);
 160
 161     glPopMatrix();
 162
 163 }