flightgear/src/Cockpit/hud_ladr.cxx

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#ifdef HAVE_WINDOWS_H
#  include <windows.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <Aircraft/aircraft.hxx>
#include <Include/fg_constants.h>
#include <Math/fg_random.h>
#include <Math/mat3.h>
#include <Math/polar3d.hxx>
#include <Scenery/scenery.hxx>
#include <Time/fg_timer.hxx>
#include <GUI/gui.h>

#include "hud.hxx"
//====================== Top of HudLadder Class =======================
HudLadder ::   HudLadder(  int       x,
               int       y,
               UINT      width,
               UINT      height,
               UINT      mini,
               FLTFNPTR  ptch_source,
               FLTFNPTR  roll_source,
               float    span_units,
               float    major_div,
               float    minor_div,
               UINT      screen_hole,
               UINT      lbl_pos,
               bool      working) :
   dual_instr_item( x, y, width, height,
                    ptch_source,
                    roll_source,
                    working,
                    HUDS_RIGHT),
                    width_units    ( (int)(span_units)   ),
                    div_units      ( (int)(major_div < 0? -major_div: major_div) ),
                    minor_div      ( (int)(minor_div)    ),
                    label_pos      ( lbl_pos      ),
                    scr_hole       ( screen_hole  ),
                    vmax           ( span_units/2 ),
                    vmin           ( -vmax        )
   {
       if( !width_units ) {
           width_units = 45;
       }
       factor = (float)get_span() / (float) width_units;
       minimal = mini;
   }
   
HudLadder ::  ~HudLadder()
    {
    }
           
    HudLadder ::
            HudLadder( const HudLadder & image ) :
            dual_instr_item( (dual_instr_item &) image),
            width_units    ( image.width_units   ),
            div_units      ( image.div_units     ),
            label_pos      ( image.label_pos     ),
            scr_hole       ( image.scr_hole      ),
            vmax           ( image.vmax ),
            vmin           ( image.vmin ),
            factor         ( image.factor        )
    {
    }
HudLadder & HudLadder ::  operator = ( const HudLadder & rhs )
    {
        if( !(this == &rhs)) {
            (dual_instr_item &)(*this) = (dual_instr_item &)rhs;
            width_units  = rhs.width_units;
            div_units    = rhs.div_units;
            label_pos    = rhs.label_pos;
            scr_hole     = rhs.scr_hole;
            vmax         = rhs.vmax;
            vmin         = rhs.vmin;
            factor       = rhs.factor;
        }
        return *this;
    }
                           
//
//  Draws a climb ladder in the center of the HUD
//

void HudLadder :: draw( void )
{
    float  x_ini;
    float  x_end;
    float  y;

    POINT  centroid    = get_centroid();
    RECT   box         = get_location();

    float   half_span  = box.right / 2.0;
    float   roll_value = current_ch2();
    
    float pitch_value = current_ch1() * RAD_TO_DEG;
    vmin              = pitch_value - (float)width_units/2.0;
    vmax              = pitch_value + (float)width_units/2.0;

    glPushMatrix();
    glTranslatef( centroid.x, centroid.y, 0);
    glRotatef(roll_value * RAD_TO_DEG, 0.0, 0.0, 1.0);

    // Draw the target spot.
#define CENTER_DIAMOND_SIZE 6.0
    glBegin(GL_LINE_LOOP);
        glVertex2f( -CENTER_DIAMOND_SIZE, 0.0);
        glVertex2f(0.0, CENTER_DIAMOND_SIZE);
        glVertex2f( CENTER_DIAMOND_SIZE, 0.0);
        glVertex2f(0.0, -CENTER_DIAMOND_SIZE);
    glEnd();
#undef CENTER_DIAMOND_SIZE

    if(minimal) {
        glPopMatrix();      
        return;
    }

    if( div_units ) {
        char     TextLadder[8] ;
        float    label_length ;
        float    label_height ;
        float    left ;
        float    right ;
        float    bot ;
        float    top ;
        float    text_offset = 4.0f ;
        float    zero_offset = 10.0f ;
  
        fntFont *font      = HUDtext->getFont();
        float    pointsize = HUDtext->getPointSize();
        float    italic    = HUDtext->getSlant();
        
        TextList.setFont( HUDtext );
        TextList.erase();
        LineList.erase();
        StippleLineList.erase();
  
        int last = FloatToInt(vmax)+1;
        int i    = FloatToInt(vmin);
        
        if( !scr_hole ) {
            for( ; i<last ; i++ ) {
                
                y =  (((float)(i - pitch_value) * factor) + .5f);
                if( !(i % div_units ))    {        //  At integral multiple of div
                
                    sprintf( TextLadder, "%d", i );
                    font->getBBox ( TextLadder, pointsize, italic,
                                    &left, &right, &bot, &top ) ;
                    label_length  = right - left;
                    label_length += text_offset;
                    label_height  = (top - bot)/2.0f;
                
                    x_ini = -half_span;
                    x_end =  half_span;
                    
                    if( i >= 0 ) {
                        // Make zero point wider on left
                        if( i == 0 )
                            x_ini -= zero_offset;
                        // Zero or above draw solid lines
                        Line(x_ini, y, x_end, y);
                    } else {
                        // Below zero draw dashed lines.
                        StippleLine(x_ini, y, x_end, y);
                    }
                    
                    // Calculate the position of the left text and write it.
                    Text( x_ini-label_length, y-label_height, TextLadder );
                    Text( x_end+text_offset,  y-label_height, TextLadder );
                }
            }
        }
        else // if(scr_hole )
        {    // Draw ladder with space in the middle of the lines
            float hole = (float)((scr_hole)/2.0f);
            for( ; i<last ; i++ )      {
                
                y = (((float)(i - pitch_value) * factor) + .5);
                if( !(i % div_units ))    {        //  At integral multiple of div
                
                    sprintf( TextLadder, "%d", i );
                    font->getBBox ( TextLadder, pointsize, italic,
                                    &left, &right, &bot, &top ) ;
                    label_length  = right - left;
                    label_length += text_offset;
                    label_height  = (top - bot)/2.0f;
//                  printf("l %f r %f b %f t %f\n",left, right, bot, top );
                
                    // Start by calculating the points and drawing the
                    // left side lines.
                    x_ini = -half_span;
                    x_end = -half_span + hole;
                    
                    if( i >= 0 ) { 
                        // Make zero point wider on left
                        if( i == 0 )
                            x_ini -= zero_offset;
                        // Zero or above draw solid lines
                        Line(x_ini, y, x_end, y);
                    } else {
                        // Below zero draw dashed lines.
                        StippleLine(x_ini, y, x_end, y);
                    }
                    
                    // Now calculate the location of the left side label using
                    Text( x_ini-label_length, y-label_height, TextLadder );
                    
                    // Now calculate and draw the right side line location
                    x_ini = half_span - hole;
                    x_end = half_span;
                    
                    if( i >= 0 ) {
                        if( i == 0 ) 
                            x_end += zero_offset;
                        // Zero or above draw solid lines
                        Line(x_ini, y, x_end, y);
                    } else {
                        // Below zero draw dashed lines.
                        StippleLine(x_ini, y, x_end, y);
                    }
                    
                    // Calculate the location and draw the right side label
                    Text( x_end+text_offset,  y-label_height, TextLadder );
                }
            }
        }
        TextList.draw();

        glLineWidth(0.2);
        
        LineList.draw();
        
        glEnable(GL_LINE_STIPPLE);
        glLineStipple( 1, 0x00FF );
        StippleLineList.draw( );
        glDisable(GL_LINE_STIPPLE);
    }
    glPopMatrix();
}