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 99 by harbaum, Mon Sep 7 19:22:02 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  100
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 476  osd_source_reallocate(osm_gps_map_osd_t Line 485  osd_source_reallocate(osm_gps_map_osd_t
485          cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w+2, h+2);          cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w+2, h+2);
486    
487      osd_render_source_sel(osd);      osd_render_source_sel(osd);
   
488  }  }
489    
490  #define OSD_HZ      15  #define OSD_HZ      15
# Line 720  osd_zoom_labels(cairo_t *cr, gint x, gin Line 728  osd_zoom_labels(cairo_t *cr, gint x, gin
728      cairo_line_to (cr, x + Z_RIGHT + Z_LEN, y + Z_MID);      cairo_line_to (cr, x + Z_RIGHT + Z_LEN, y + Z_MID);
729  }  }
730    
731    static char *
732    dist_str_metric(int dist)
733    {
734        if(dist<1000)
735            return g_strdup_printf("%u m",  dist);
736    
737        return g_strdup_printf("%u km", dist/1000);
738    }
739    
740    static void
741    osd_render_scale(osm_gps_map_osd_t *osd)
742    {
743        osd_priv_t *priv = (osd_priv_t*)osd->priv;
744        float m_per_pix = osm_gps_map_get_scale(OSM_GPS_MAP(osd->widget));
745    
746        /* first fill with transparency */
747        cairo_t *cr = cairo_create(priv->scale);
748        cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
749        //    cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.0);
750        cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.2);
751        cairo_paint(cr);
752        cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
753    
754        /* determine the size of the scale width in meters */
755        float width = (OSD_SCALE_W-2) * m_per_pix;
756        printf("width = %f meters\n", width);
757    
758        /* scale this to useful values */
759        int exp = logf(width)*M_LOG10E;
760        int mant = width/pow(10,exp);
761        printf("mant = %d, exp = %d \n", mant, exp);
762    
763        int width_metric = mant * pow(10,exp);
764        char *dist_str = dist_str_metric(width_metric);
765        width_metric /= m_per_pix;
766        printf("metric scale width = %d pixels: %s\n", width_metric, dist_str);
767    
768        int font_size = 12;
769    
770        cairo_select_font_face (cr, "Sans",
771                                CAIRO_FONT_SLANT_NORMAL,
772                                CAIRO_FONT_WEIGHT_BOLD);
773        cairo_set_font_size (cr, font_size);
774        cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0);
775    
776        cairo_text_extents_t extents;
777        cairo_text_extents (cr, dist_str, &extents);
778    
779        cairo_move_to (cr, font_size/3, font_size);
780        cairo_show_text (cr, dist_str);
781    
782        printf("height = %f, bearing = %f\n",  extents.height, extents.y_bearing);
783    
784        /* draw white line */
785        cairo_set_line_cap  (cr, CAIRO_LINE_CAP_ROUND);
786        cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 1.0);
787        cairo_set_line_width (cr, 3);
788        cairo_move_to (cr, 2, 2*font_size/3);
789        cairo_rel_line_to (cr, 0,  2*font_size/3);
790        cairo_rel_line_to (cr, width_metric, 0);
791        cairo_rel_line_to (cr, 0, -2*font_size/3);
792        cairo_stroke(cr);
793    
794        /* draw black line */
795        cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0);
796        cairo_set_line_width (cr, 2);
797        cairo_move_to (cr, 2, 2*font_size/3);
798        cairo_rel_line_to (cr, 0,  2*font_size/3);
799        cairo_rel_line_to (cr, width_metric, 0);
800        cairo_rel_line_to (cr, 0, -2*font_size/3);
801        cairo_stroke(cr);
802    
803        /* xyz */
804    
805        cairo_destroy(cr);
806    }
807    
808  static void  static void
809  osd_render(osm_gps_map_osd_t *osd) {  osd_render(osm_gps_map_osd_t *osd)
810    {
811      osd_priv_t *priv = (osd_priv_t*)osd->priv;      osd_priv_t *priv = (osd_priv_t*)osd->priv;
812    
813  #ifndef OSD_COLOR  #ifndef OSD_COLOR
# Line 806  osd_render(osm_gps_map_osd_t *osd) { Line 892  osd_render(osm_gps_map_osd_t *osd) {
892  #ifdef OSD_SOURCE_SEL  #ifdef OSD_SOURCE_SEL
893      osd_render_source_sel(osd);      osd_render_source_sel(osd);
894  #endif  #endif
895    
896    #ifdef OSD_SCALE
897        osd_render_scale(osd);
898    #endif
899  }  }
900    
901  static void  static void
# Line 827  osd_draw(osm_gps_map_osd_t *osd, GdkDraw Line 917  osd_draw(osm_gps_map_osd_t *osd, GdkDraw
917                                             OSD_S_W+2, OSD_S_H+2);                                             OSD_S_W+2, OSD_S_H+2);
918  #endif  #endif
919    
920    #ifdef OSD_SCALE
921            priv->scale =
922                cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
923                                           OSD_SCALE_W+2, OSD_SCALE_H+2);
924    #endif
925    
926          /* ... and render it */          /* ... and render it */
927          osd_render(osd);          osd_render(osd);
928      }      }
# Line 866  osd_draw(osm_gps_map_osd_t *osd, GdkDraw Line 962  osd_draw(osm_gps_map_osd_t *osd, GdkDraw
962      cairo_paint(cr);      cairo_paint(cr);
963  #endif  #endif
964    
965    #ifdef OSD_SCALE
966        x =  OSD_X;
967        y = -OSD_Y;
968        if(x < 0) x += osd->widget->allocation.width - OSD_SCALE_W;
969        if(y < 0) y += osd->widget->allocation.height - OSD_SCALE_H;
970    
971        cairo_set_source_surface(cr, priv->scale, x, y);
972        cairo_paint(cr);
973    #endif
974    
975      cairo_destroy(cr);      cairo_destroy(cr);
976  }  }
977    
# Line 885  osd_free(osm_gps_map_osd_t *osd) Line 991  osd_free(osm_gps_map_osd_t *osd)
991           cairo_surface_destroy(priv->map_source);           cairo_surface_destroy(priv->map_source);
992  #endif  #endif
993    
994    #ifdef OSD_SCALE
995        if (priv->scale)
996             cairo_surface_destroy(priv->scale);
997    #endif
998    
999      g_free(priv);      g_free(priv);
1000  }  }
1001    
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