Diff of /trunk/src/osm-gps-map-osd-classic.c

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revision 94 by harbaum, Thu Sep 3 11:04:05 2009 UTC revision 102 by harbaum, Tue Sep 8 19:08:37 2009 UTC
# Line 25  Line 25 
25  /* OSD_DIAMETER */  /* OSD_DIAMETER */
26  /* OSD_X, OSD_Y */  /* OSD_X, OSD_Y */
27    
28    #define OSD_SCALE
29    
30    #define OSD_SCALE_W  120
31    #define OSD_SCALE_H   20
32    
33  #ifndef USE_CAIRO  #ifndef USE_CAIRO
34  #error "OSD control display lacks a non-cairo implementation!"  #error "OSD control display lacks a non-cairo implementation!"
35  #endif  #endif
# Line 39  typedef struct { Line 44  typedef struct {
44      /* the offscreen representation of the OSD */      /* the offscreen representation of the OSD */
45      cairo_surface_t *overlay;      cairo_surface_t *overlay;
46    
47    #ifdef OSD_SCALE
48        cairo_surface_t *scale;
49    #endif
50    
51  #ifdef OSD_SOURCE_SEL  #ifdef OSD_SOURCE_SEL
52      /* values to handle the "source" menu */      /* values to handle the "source" menu */
53      cairo_surface_t *map_source;      cairo_surface_t *map_source;
# Line 442  osd_source_reallocate(osm_gps_map_osd_t Line 451  osd_source_reallocate(osm_gps_map_osd_t
451    
452      int w = OSD_S_W, h = OSD_S_H;      int w = OSD_S_W, h = OSD_S_H;
453      if(priv->expanded) {      if(priv->expanded) {
         /* ... and right of it the waypoint id */  
454          cairo_text_extents_t extents;          cairo_text_extents_t extents;
455    
456          /* determine content size */          /* determine content size */
# Line 476  osd_source_reallocate(osm_gps_map_osd_t Line 484  osd_source_reallocate(osm_gps_map_osd_t
484          cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w+2, h+2);          cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w+2, h+2);
485    
486      osd_render_source_sel(osd);      osd_render_source_sel(osd);
   
487  }  }
488    
489  #define OSD_HZ      15  #define OSD_HZ      15
# Line 720  osd_zoom_labels(cairo_t *cr, gint x, gin Line 727  osd_zoom_labels(cairo_t *cr, gint x, gin
727      cairo_line_to (cr, x + Z_RIGHT + Z_LEN, y + Z_MID);      cairo_line_to (cr, x + Z_RIGHT + Z_LEN, y + Z_MID);
728  }  }
729    
730    static char *
731    dist_str_metric(int dist)
732    {
733        if(dist<1000)
734            return g_strdup_printf("%u m",  dist);
735    
736        return g_strdup_printf("%u km", dist/1000);
737    }
738    
739    #define OSD_SCALE_FONT_SIZE 12
740    
741  static void  static void
742  osd_render(osm_gps_map_osd_t *osd) {  osd_render_scale(osm_gps_map_osd_t *osd)
743    {
744        osd_priv_t *priv = (osd_priv_t*)osd->priv;
745        float m_per_pix = osm_gps_map_get_scale(OSM_GPS_MAP(osd->widget));
746    
747        /* first fill with transparency */
748        cairo_t *cr = cairo_create(priv->scale);
749        cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
750        cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.0);
751        //    cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.2);
752        cairo_paint(cr);
753        cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
754    
755        /* determine the size of the scale width in meters */
756        float width = (OSD_SCALE_W-2) * m_per_pix;
757        printf("%d pixels is %f m\n", OSD_SCALE_W-2, width);
758    
759        /* scale this to useful values */
760        int exp = logf(width)*M_LOG10E;
761        int mant = width/pow(10,exp);
762        int width_metric = mant * pow(10,exp);
763        char *dist_str = dist_str_metric(width_metric);
764        width_metric /= m_per_pix;
765    
766        /* and now the hard part: scale for useful imperial values :-( */
767        /* try to convert to feet, 1ft == 0.3048 m */
768        width /= 0.3048;
769        float imp_scale = 0.3048;
770        char *dist_imp_unit = "ft";
771    
772        if(width >= 100) {
773            /* 1yd == 3 feet */
774            width /= 3.0;
775            imp_scale *= 3.0;
776            dist_imp_unit = "yd";
777    
778            if(width >= 1760.0) {
779                /* 1mi == 1760 yd */
780                width /= 1760.0;
781                imp_scale *= 1760.0;
782                dist_imp_unit = "mi";
783            }
784        }
785    
786        printf("this is %f %s\n", width, dist_imp_unit);
787        printf("this is %f pixels\n", width * imp_scale / m_per_pix);
788    
789        cairo_select_font_face (cr, "Sans",
790                                CAIRO_FONT_SLANT_NORMAL,
791                                CAIRO_FONT_WEIGHT_BOLD);
792        cairo_set_font_size (cr, OSD_SCALE_FONT_SIZE);
793        cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0);
794    
795        cairo_text_extents_t extents;
796        cairo_text_extents (cr, dist_str, &extents);
797    
798        cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
799        cairo_move_to (cr, OSD_SCALE_FONT_SIZE/3, OSD_SCALE_FONT_SIZE);
800        cairo_text_path (cr, dist_str);
801        cairo_set_line_width (cr, 2);
802        cairo_stroke (cr);
803    
804        cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
805        cairo_move_to (cr, OSD_SCALE_FONT_SIZE/3, OSD_SCALE_FONT_SIZE);
806        cairo_show_text (cr, dist_str);
807    
808        /* draw white line */
809        cairo_set_line_cap  (cr, CAIRO_LINE_CAP_ROUND);
810        cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 1.0);
811        cairo_set_line_width (cr, 4);
812        cairo_move_to (cr, 2, 2*OSD_SCALE_FONT_SIZE/3);
813        cairo_rel_line_to (cr, 0,  2*OSD_SCALE_FONT_SIZE/3);
814        cairo_rel_line_to (cr, width_metric, 0);
815        cairo_rel_line_to (cr, 0, -2*OSD_SCALE_FONT_SIZE/3);
816        cairo_stroke(cr);
817    
818        /* draw black line */
819        cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0);
820        cairo_set_line_width (cr, 2);
821        cairo_move_to (cr, 2, 2*OSD_SCALE_FONT_SIZE/3);
822        cairo_rel_line_to (cr, 0,  2*OSD_SCALE_FONT_SIZE/3);
823        cairo_rel_line_to (cr, width_metric, 0);
824        cairo_rel_line_to (cr, 0, -2*OSD_SCALE_FONT_SIZE/3);
825        cairo_stroke(cr);
826    
827        /* xyz */
828    
829        cairo_destroy(cr);
830    }
831    
832    static void
833    osd_render(osm_gps_map_osd_t *osd)
834    {
835      osd_priv_t *priv = (osd_priv_t*)osd->priv;      osd_priv_t *priv = (osd_priv_t*)osd->priv;
836    
837  #ifndef OSD_COLOR  #ifndef OSD_COLOR
# Line 806  osd_render(osm_gps_map_osd_t *osd) { Line 916  osd_render(osm_gps_map_osd_t *osd) {
916  #ifdef OSD_SOURCE_SEL  #ifdef OSD_SOURCE_SEL
917      osd_render_source_sel(osd);      osd_render_source_sel(osd);
918  #endif  #endif
919    
920    #ifdef OSD_SCALE
921        osd_render_scale(osd);
922    #endif
923  }  }
924    
925  static void  static void
# Line 827  osd_draw(osm_gps_map_osd_t *osd, GdkDraw Line 941  osd_draw(osm_gps_map_osd_t *osd, GdkDraw
941                                             OSD_S_W+2, OSD_S_H+2);                                             OSD_S_W+2, OSD_S_H+2);
942  #endif  #endif
943    
944    #ifdef OSD_SCALE
945            priv->scale =
946                cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
947                                           OSD_SCALE_W+2, OSD_SCALE_H+2);
948    #endif
949    
950          /* ... and render it */          /* ... and render it */
951          osd_render(osd);          osd_render(osd);
952      }      }
# Line 866  osd_draw(osm_gps_map_osd_t *osd, GdkDraw Line 986  osd_draw(osm_gps_map_osd_t *osd, GdkDraw
986      cairo_paint(cr);      cairo_paint(cr);
987  #endif  #endif
988    
989    #ifdef OSD_SCALE
990        x =  OSD_X;
991        y = -OSD_Y;
992        if(x < 0) x += osd->widget->allocation.width - OSD_SCALE_W;
993        if(y < 0) y += osd->widget->allocation.height - OSD_SCALE_H;
994    
995        cairo_set_source_surface(cr, priv->scale, x, y);
996        cairo_paint(cr);
997    #endif
998    
999      cairo_destroy(cr);      cairo_destroy(cr);
1000  }  }
1001    
# Line 885  osd_free(osm_gps_map_osd_t *osd) Line 1015  osd_free(osm_gps_map_osd_t *osd)
1015           cairo_surface_destroy(priv->map_source);           cairo_surface_destroy(priv->map_source);
1016  #endif  #endif
1017    
1018    #ifdef OSD_SCALE
1019        if (priv->scale)
1020             cairo_surface_destroy(priv->scale);
1021    #endif
1022    
1023      g_free(priv);      g_free(priv);
1024  }  }
1025    
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